3e5a05f819
max11802: Fix compilation errors and allow setting PULL and SAMPLE registers. Approved-by: GregoryN <gnutt@nuttx.org>
1320 lines
37 KiB
C
1320 lines
37 KiB
C
/****************************************************************************
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* drivers/input/max11802.c
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*
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* Copyright (C) 2011-2012, 2014-2017 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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* Petteri Aimonen <jpa@nx.mail.kapsi.fi>
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*
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* References:
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* "Low-Power, Ultra-Small Resistive Touch-Screen Controllers
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* with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <semaphore.h>
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#include <poll.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/wdog.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/random.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/input/max11802.h>
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#include "max11802.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* This is a value for the threshold that guarantees a big difference on the
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* first pendown (but can't overflow).
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*/
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#define INVALID_THRESHOLD 0x1000
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Low-level SPI helpers */
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static void max11802_lock(FAR struct spi_dev_s *spi);
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static void max11802_unlock(FAR struct spi_dev_s *spi);
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static uint16_t max11802_sendcmd(FAR struct max11802_dev_s *priv,
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uint8_t cmd, int *tags);
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/* Interrupts and data sampling */
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static void max11802_notify(FAR struct max11802_dev_s *priv);
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static int max11802_sample(FAR struct max11802_dev_s *priv,
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FAR struct max11802_sample_s *sample);
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static int max11802_waitsample(FAR struct max11802_dev_s *priv,
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FAR struct max11802_sample_s *sample);
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static void max11802_worker(FAR void *arg);
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static int max11802_interrupt(int irq, FAR void *context, FAR void *arg);
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/* Character driver methods */
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static int max11802_open(FAR struct file *filep);
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static int max11802_close(FAR struct file *filep);
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static ssize_t max11802_read(FAR struct file *filep, FAR char *buffer,
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size_t len);
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static int max11802_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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#ifndef CONFIG_DISABLE_POLL
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static int max11802_poll(FAR struct file *filep, struct pollfd *fds,
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bool setup);
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This the vtable that supports the character driver interface */
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static const struct file_operations max11802_fops =
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{
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max11802_open, /* open */
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max11802_close, /* close */
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max11802_read, /* read */
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0, /* write */
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0, /* seek */
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max11802_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, max11802_poll /* poll */
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#endif
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, 0 /* unlink */
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#endif
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};
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/* If only a single MAX11802 device is supported, then the driver state
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* structure may as well be pre-allocated.
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*/
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#ifndef CONFIG_MAX11802_MULTIPLE
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static struct max11802_dev_s g_max11802;
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/* Otherwise, we will need to maintain allocated driver instances in a list */
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#else
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static struct max11802_dev_s *g_max11802list;
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: max11802_lock
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*
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* Description:
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* Lock the SPI bus and re-configure as necessary. This function must be
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* to assure: (1) exclusive access to the SPI bus, and (2) to assure that
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* the shared bus is properly configured for the touchscreen controller.
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*
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* Input Parameters:
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* spi - Reference to the SPI driver structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static void max11802_lock(FAR struct spi_dev_s *spi)
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{
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/* Lock the SPI bus because there are multiple devices competing for the
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* SPI bus
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*/
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(void)SPI_LOCK(spi, true);
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/* We have the lock. Now make sure that the SPI bus is configured for the
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* MAX11802 (it might have gotten configured for a different device while
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* unlocked)
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*/
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SPI_SETMODE(spi, CONFIG_MAX11802_SPIMODE);
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SPI_SETBITS(spi, 8);
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(void)SPI_HWFEATURES(spi, 0);
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(void)SPI_SETFREQUENCY(spi, CONFIG_MAX11802_FREQUENCY);
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}
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/****************************************************************************
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* Name: max11802_unlock
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*
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* Description:
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* Un-lock the SPI bus after each transfer, possibly losing the current
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* configuration if we are sharing the SPI bus with other devices
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*
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* Input Parameters:
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* spi - Reference to the SPI driver structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static void max11802_unlock(FAR struct spi_dev_s *spi)
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{
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/* Relinquish the SPI bus. */
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(void)SPI_LOCK(spi, false);
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}
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/****************************************************************************
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* Name: max11802_sendcmd
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****************************************************************************/
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static uint16_t max11802_sendcmd(FAR struct max11802_dev_s *priv,
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uint8_t cmd, int *tags)
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{
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uint8_t buffer[2];
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uint16_t result;
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/* Select the MAX11802 */
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SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
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/* Send the command */
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(void)SPI_SEND(priv->spi, cmd);
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/* Read the data */
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SPI_RECVBLOCK(priv->spi, buffer, 2);
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SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
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result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1];
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*tags = result & 0xF;
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result >>= 4; /* Get rid of tags */
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iinfo("cmd:%02x response:%04x\n", cmd, result);
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return result;
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}
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/****************************************************************************
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* Name: max11802_notify
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****************************************************************************/
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static void max11802_notify(FAR struct max11802_dev_s *priv)
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{
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#ifndef CONFIG_DISABLE_POLL
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int i;
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#endif
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/* If there are threads waiting for read data, then signal one of them
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* that the read data is available.
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*/
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if (priv->nwaiters > 0)
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{
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/* After posting this semaphore, we need to exit because the sample
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* is no longer available.
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*/
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nxsem_post(&priv->waitsem);
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}
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/* If there are threads waiting on poll() for MAX11802 data to become
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* available, then wake them up now. NOTE: we wake up all waiting
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* threads because we do not know that they are going to do. If they
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* all try to read the data, then some make end up blocking after all.
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*/
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#ifndef CONFIG_DISABLE_POLL
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for (i = 0; i < CONFIG_MAX11802_NPOLLWAITERS; i++)
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{
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struct pollfd *fds = priv->fds[i];
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if (fds)
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{
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fds->revents |= POLLIN;
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iinfo("Report events: %02x\n", fds->revents);
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nxsem_post(fds->sem);
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}
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}
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#endif
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}
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/****************************************************************************
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* Name: max11802_sample
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****************************************************************************/
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static int max11802_sample(FAR struct max11802_dev_s *priv,
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FAR struct max11802_sample_s *sample)
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{
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irqstate_t flags;
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int ret = -EAGAIN;
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/* Interrupts must be disabled when this is called to (1) prevent posting
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* of semaphores from interrupt handlers, and (2) to prevent sampled data
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* from changing until it has been reported.
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*/
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flags = enter_critical_section();
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/* Is there new MAX11802 sample data available? */
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if (priv->penchange)
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{
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/* Yes.. the state has changed in some way. Return a copy of the
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* sampled data.
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*/
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memcpy(sample, &priv->sample, sizeof(struct max11802_sample_s));
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/* Now manage state transitions */
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if (sample->contact == CONTACT_UP)
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{
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/* Next.. no contact. Increment the ID so that next contact ID
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* will be unique. X/Y positions are no longer valid.
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*/
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priv->sample.contact = CONTACT_NONE;
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priv->sample.valid = false;
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priv->id++;
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}
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else if (sample->contact == CONTACT_DOWN)
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{
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/* First report -- next report will be a movement */
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priv->sample.contact = CONTACT_MOVE;
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}
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priv->penchange = false;
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ret = OK;
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}
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leave_critical_section(flags);
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return ret;
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}
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/****************************************************************************
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* Name: max11802_waitsample
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****************************************************************************/
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static int max11802_waitsample(FAR struct max11802_dev_s *priv,
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FAR struct max11802_sample_s *sample)
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{
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irqstate_t flags;
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int ret;
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/* Interrupts must be disabled when this is called to (1) prevent posting
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* of semaphores from interrupt handlers, and (2) to prevent sampled data
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* from changing until it has been reported.
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*
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* In addition, we will also disable pre-emption to prevent other threads
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* from getting control while we muck with the semaphores.
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*/
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sched_lock();
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flags = enter_critical_section();
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/* Now release the semaphore that manages mutually exclusive access to
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* the device structure. This may cause other tasks to become ready to
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* run, but they cannot run yet because pre-emption is disabled.
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*/
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nxsem_post(&priv->devsem);
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/* Try to get the a sample... if we cannot, then wait on the semaphore
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* that is posted when new sample data is available.
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*/
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while (max11802_sample(priv, sample) < 0)
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{
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/* Wait for a change in the MAX11802 state */
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iinfo("Waiting..\n");
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priv->nwaiters++;
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ret = nxsem_wait(&priv->waitsem);
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priv->nwaiters--;
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if (ret < 0)
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{
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/* If we are awakened by a signal, then we need to return
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* the failure now.
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*/
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ierr("ERROR: nxsem_wait: %d\n", ret);
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DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
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goto errout;
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}
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}
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iinfo("Sampled\n");
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/* Re-acquire the semaphore that manages mutually exclusive access to
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* the device structure. We may have to wait here. But we have our
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* sample. Interrupts and pre-emption will be re-enabled while we wait.
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*/
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ret = nxsem_wait(&priv->devsem);
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errout:
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/* Then re-enable interrupts. We might get interrupt here and there
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* could be a new sample. But no new threads will run because we still
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* have pre-emption disabled.
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*/
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leave_critical_section(flags);
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/* Restore pre-emption. We might get suspended here but that is okay
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* because we already have our sample. Note: this means that if there
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* were two threads reading from the MAX11802 for some reason, the data
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* might be read out of order.
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*/
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sched_unlock();
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return ret;
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}
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/****************************************************************************
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* Name: max11802_schedule
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****************************************************************************/
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static int max11802_schedule(FAR struct max11802_dev_s *priv)
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{
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FAR struct max11802_config_s *config;
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int ret;
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/* Get a pointer the callbacks for convenience (and so the code is not so
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* ugly).
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*/
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config = priv->config;
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DEBUGASSERT(config != NULL);
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/* Disable further interrupts. MAX11802 interrupts will be re-enabled
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* after the worker thread executes.
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*/
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config->enable(config, false);
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/* Disable the watchdog timer. It will be re-enabled in the worker thread
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* while the pen remains down.
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*/
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wd_cancel(priv->wdog);
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/* Transfer processing to the worker thread. Since MAX11802 interrupts are
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* disabled while the work is pending, no special action should be required
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* to protected the work queue.
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*/
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DEBUGASSERT(priv->work.worker == NULL);
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ret = work_queue(HPWORK, &priv->work, max11802_worker, priv, 0);
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if (ret != 0)
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{
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ierr("ERROR: Failed to queue work: %d\n", ret);
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}
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return OK;
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}
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/****************************************************************************
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* Name: max11802_wdog
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****************************************************************************/
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static void max11802_wdog(int argc, uint32_t arg1, ...)
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{
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FAR struct max11802_dev_s *priv = (FAR struct max11802_dev_s *)((uintptr_t)arg1);
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(void)max11802_schedule(priv);
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}
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/****************************************************************************
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* Name: max11802_worker
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****************************************************************************/
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static void max11802_worker(FAR void *arg)
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{
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FAR struct max11802_dev_s *priv = (FAR struct max11802_dev_s *)arg;
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FAR struct max11802_config_s *config;
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uint16_t x;
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uint16_t y;
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uint16_t xdiff;
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uint16_t ydiff;
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bool pendown;
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int ret;
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int tags, tags2;
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DEBUGASSERT(priv != NULL);
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/* Get a pointer the callbacks for convenience (and so the code is not so
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* ugly).
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*/
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config = priv->config;
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DEBUGASSERT(config != NULL);
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/* Disable the watchdog timer. This is safe because it is started only
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* by this function and this function is serialized on the worker thread.
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*/
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wd_cancel(priv->wdog);
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/* Lock the SPI bus so that we have exclusive access */
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max11802_lock(priv->spi);
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/* Start coordinate measurement */
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(void)max11802_sendcmd(priv, MAX11802_CMD_MEASUREXY, &tags);
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/* Get exclusive access to the driver data structure */
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do
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{
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ret = nxsem_wait(&priv->devsem);
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/* This should only fail if the wait was cancelled by an signal
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* (and the worker thread will receive a lot of signals).
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*/
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DEBUGASSERT(ret == OK || ret == -EINTR);
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}
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while (ret == -EINTR);
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/* Check for pen up or down by reading the PENIRQ GPIO. */
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pendown = config->pendown(config);
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/* Handle the change from pen down to pen up */
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if (pendown)
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{
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iinfo("\nPD\n");
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}
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else
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{
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iinfo("\nPU\n");
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}
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if (!pendown)
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{
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/* The pen is up.. reset thresholding variables. */
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priv->threshx = INVALID_THRESHOLD;
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priv->threshy = INVALID_THRESHOLD;
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|
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/* Ignore the interrupt if the pen was already up (CONTACT_NONE ==
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* pen up and already reported; CONTACT_UP == pen up, but not
|
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* reported).
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|
*/
|
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|
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iinfo("\nPC%d\n", priv->sample.contact);
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|
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if (priv->sample.contact == CONTACT_NONE ||
|
|
priv->sample.contact == CONTACT_UP)
|
|
|
|
{
|
|
goto ignored;
|
|
}
|
|
|
|
/* The pen is up. NOTE: We know from a previous test, that this is a
|
|
* loss of contact condition. This will be changed to CONTACT_NONE
|
|
* after the loss of contact is sampled.
|
|
*/
|
|
|
|
priv->sample.contact = CONTACT_UP;
|
|
}
|
|
|
|
/* It is a pen down event. If the last loss-of-contact event has not been
|
|
* processed yet, then we have to ignore the pen down event (or else it
|
|
* will look like a drag event)
|
|
*/
|
|
|
|
else if (priv->sample.contact == CONTACT_UP)
|
|
{
|
|
/* If we have not yet processed the last pen up event, then we
|
|
* cannot handle this pen down event. We will have to discard it.
|
|
* That should be okay because we will set the timer to to sample
|
|
* again later.
|
|
*/
|
|
|
|
iinfo("Previous pen up event still in buffer\n");
|
|
max11802_notify(priv);
|
|
(void)wd_start(priv->wdog, MAX11802_WDOG_DELAY, max11802_wdog, 1,
|
|
(uint32_t)priv);
|
|
goto ignored;
|
|
}
|
|
else
|
|
{
|
|
/* Wait for data ready
|
|
*
|
|
* Note: MAX11802 signals the readiness of the results using
|
|
* the lowest 4 bits of the result. However these are the
|
|
* last bits to be read out of the device. It appears that
|
|
* the hardware value can change in the middle of the readout,
|
|
* causing the upper bits to be still invalid even though lower
|
|
* bits indicate valid result.
|
|
*
|
|
* We work around this by reading the registers once more after
|
|
* the tags indicate they are ready.
|
|
*/
|
|
|
|
int readycount = 0;
|
|
do
|
|
{
|
|
#ifdef CONFIG_MAX11802_SWAPXY
|
|
x = max11802_sendcmd(priv, MAX11802_CMD_YPOSITION, &tags);
|
|
y = max11802_sendcmd(priv, MAX11802_CMD_XPOSITION, &tags2);
|
|
#else
|
|
x = max11802_sendcmd(priv, MAX11802_CMD_XPOSITION, &tags);
|
|
y = max11802_sendcmd(priv, MAX11802_CMD_YPOSITION, &tags2);
|
|
#endif
|
|
if (tags != 0xF && tags2 != 0xF)
|
|
{
|
|
readycount++;
|
|
}
|
|
}
|
|
while (readycount < 2);
|
|
|
|
add_ui_randomness((x << 16) | y);
|
|
|
|
/* Continue to sample the position while the pen is down */
|
|
|
|
(void)wd_start(priv->wdog, MAX11802_WDOG_DELAY, max11802_wdog, 1,
|
|
(uint32_t)priv);
|
|
|
|
/* Check if data is valid */
|
|
|
|
if ((tags & 0x03) != 0)
|
|
{
|
|
iinfo("Touch ended before measurement\n");
|
|
goto ignored;
|
|
}
|
|
|
|
/* Perform a thresholding operation so that the results will be more
|
|
* stable. If the difference from the last sample is small, then
|
|
* ignore the event.
|
|
*
|
|
* REVISIT: Should a large change in pressure also generate a event?
|
|
*/
|
|
|
|
xdiff = x > priv->threshx ? (x - priv->threshx) : (priv->threshx - x);
|
|
ydiff = y > priv->threshy ? (y - priv->threshy) : (priv->threshy - y);
|
|
|
|
/* Check the thresholds. Bail if there is no significant difference */
|
|
|
|
if (xdiff < CONFIG_MAX11802_THRESHX && ydiff < CONFIG_MAX11802_THRESHY)
|
|
{
|
|
/* Little or no change in either direction ... don't report anything. */
|
|
|
|
goto ignored;
|
|
}
|
|
|
|
/* When we see a big difference, snap to the new x/y thresholds */
|
|
|
|
priv->threshx = x;
|
|
priv->threshy = y;
|
|
|
|
/* Update the x/y position in the sample data */
|
|
|
|
priv->sample.x = priv->threshx;
|
|
priv->sample.y = priv->threshy;
|
|
|
|
/* The X/Y positional data is now valid */
|
|
|
|
priv->sample.valid = true;
|
|
|
|
/* If this is the first (acknowledged) pen down report, then report
|
|
* this as the first contact. If contact == CONTACT_DOWN, it will be
|
|
* set to set to CONTACT_MOVE after the contact is first sampled.
|
|
*/
|
|
|
|
if (priv->sample.contact != CONTACT_MOVE)
|
|
{
|
|
/* First contact */
|
|
|
|
priv->sample.contact = CONTACT_DOWN;
|
|
}
|
|
}
|
|
|
|
/* Indicate the availability of new sample data for this ID */
|
|
|
|
priv->sample.id = priv->id;
|
|
priv->penchange = true;
|
|
|
|
/* Notify any waiters that new MAX11802 data is available */
|
|
|
|
max11802_notify(priv);
|
|
|
|
ignored:
|
|
config->enable(config, true);
|
|
|
|
/* Release our lock on the state structure and unlock the SPI bus */
|
|
|
|
nxsem_post(&priv->devsem);
|
|
max11802_unlock(priv->spi);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_interrupt
|
|
****************************************************************************/
|
|
|
|
static int max11802_interrupt(int irq, FAR void *context, FAR void *arg)
|
|
{
|
|
FAR struct max11802_dev_s *priv;
|
|
FAR struct max11802_config_s *config;
|
|
int ret;
|
|
|
|
/* Which MAX11802 device caused the interrupt? */
|
|
|
|
#ifndef CONFIG_MAX11802_MULTIPLE
|
|
priv = &g_max11802;
|
|
#else
|
|
for (priv = g_max11802list;
|
|
priv && priv->configs->irq != irq;
|
|
priv = priv->flink);
|
|
|
|
DEBUGASSERT(priv != NULL);
|
|
#endif
|
|
|
|
/* Get a pointer the callbacks for convenience (and so the code is not so
|
|
* ugly).
|
|
*/
|
|
|
|
config = priv->config;
|
|
DEBUGASSERT(config != NULL);
|
|
|
|
/* Schedule sampling to occur on the worker thread */
|
|
|
|
ret = max11802_schedule(priv);
|
|
|
|
/* Clear any pending interrupts and return success */
|
|
|
|
config->clear(config);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_open
|
|
****************************************************************************/
|
|
|
|
static int max11802_open(FAR struct file *filep)
|
|
{
|
|
#ifdef CONFIG_MAX11802_REFCNT
|
|
FAR struct inode *inode;
|
|
FAR struct max11802_dev_s *priv;
|
|
uint8_t tmp;
|
|
int ret;
|
|
|
|
iinfo("Opening\n");
|
|
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (FAR struct max11802_dev_s *)inode->i_private;
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxsem_wait(&priv->devsem);
|
|
if (ret < 0)
|
|
{
|
|
/* This should only happen if the wait was canceled by an signal */
|
|
|
|
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
|
|
return ret;
|
|
}
|
|
|
|
/* Increment the reference count */
|
|
|
|
tmp = priv->crefs + 1;
|
|
if (tmp == 0)
|
|
{
|
|
/* More than 255 opens; uint8_t overflows to zero */
|
|
|
|
ret = -EMFILE;
|
|
goto errout_with_sem;
|
|
}
|
|
|
|
/* When the reference increments to 1, this is the first open event
|
|
* on the driver.. and an opportunity to do any one-time initialization.
|
|
*/
|
|
|
|
/* Save the new open count on success */
|
|
|
|
priv->crefs = tmp;
|
|
|
|
errout_with_sem:
|
|
nxsem_post(&priv->devsem);
|
|
return ret;
|
|
#else
|
|
iinfo("Opening\n");
|
|
return OK;
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_close
|
|
****************************************************************************/
|
|
|
|
static int max11802_close(FAR struct file *filep)
|
|
{
|
|
#ifdef CONFIG_MAX11802_REFCNT
|
|
FAR struct inode *inode;
|
|
FAR struct max11802_dev_s *priv;
|
|
int ret;
|
|
|
|
iinfo("Closing\n");
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (FAR struct max11802_dev_s *)inode->i_private;
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxsem_wait(&priv->devsem);
|
|
if (ret < 0)
|
|
{
|
|
/* This should only happen if the wait was canceled by an signal */
|
|
|
|
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
|
|
return ret;
|
|
}
|
|
|
|
/* Decrement the reference count unless it would decrement a negative
|
|
* value. When the count decrements to zero, there are no further
|
|
* open references to the driver.
|
|
*/
|
|
|
|
if (priv->crefs >= 1)
|
|
{
|
|
priv->crefs--;
|
|
}
|
|
|
|
nxsem_post(&priv->devsem);
|
|
#endif
|
|
iinfo("Closing\n");
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_read
|
|
****************************************************************************/
|
|
|
|
static ssize_t max11802_read(FAR struct file *filep, FAR char *buffer,
|
|
size_t len)
|
|
{
|
|
FAR struct inode *inode;
|
|
FAR struct max11802_dev_s *priv;
|
|
FAR struct touch_sample_s *report;
|
|
struct max11802_sample_s sample;
|
|
int ret;
|
|
|
|
iinfo("buffer:%p len:%d\n", buffer, len);
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (FAR struct max11802_dev_s *)inode->i_private;
|
|
|
|
/* Verify that the caller has provided a buffer large enough to receive
|
|
* the touch data.
|
|
*/
|
|
|
|
if (len < SIZEOF_TOUCH_SAMPLE_S(1))
|
|
{
|
|
/* We could provide logic to break up a touch report into segments and
|
|
* handle smaller reads... but why?
|
|
*/
|
|
|
|
ierr("ERROR: Unsupported read size: %d\n", len);
|
|
return -ENOSYS;
|
|
}
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxsem_wait(&priv->devsem);
|
|
if (ret < 0)
|
|
{
|
|
/* This should only happen if the wait was cancelled by an signal */
|
|
|
|
ierr("ERROR: nxsem_wait: %d\n", ret);
|
|
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
|
|
return ret;
|
|
}
|
|
|
|
/* Try to read sample data. */
|
|
|
|
ret = max11802_sample(priv, &sample);
|
|
if (ret < 0)
|
|
{
|
|
/* Sample data is not available now. We would ave to wait to get
|
|
* receive sample data. If the user has specified the O_NONBLOCK
|
|
* option, then just return an error.
|
|
*/
|
|
|
|
iinfo("Sample data is not available\n");
|
|
if (filep->f_oflags & O_NONBLOCK)
|
|
{
|
|
ret = -EAGAIN;
|
|
goto errout;
|
|
}
|
|
|
|
/* Wait for sample data */
|
|
|
|
ret = max11802_waitsample(priv, &sample);
|
|
if (ret < 0)
|
|
{
|
|
/* We might have been awakened by a signal */
|
|
|
|
ierr("ERROR: max11802_waitsample: %d\n", ret);
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* In any event, we now have sampled MAX11802 data that we can report
|
|
* to the caller.
|
|
*/
|
|
|
|
report = (FAR struct touch_sample_s *)buffer;
|
|
memset(report, 0, SIZEOF_TOUCH_SAMPLE_S(1));
|
|
report->npoints = 1;
|
|
report->point[0].id = sample.id;
|
|
report->point[0].x = sample.x;
|
|
report->point[0].y = sample.y;
|
|
|
|
/* Report the appropriate flags */
|
|
|
|
if (sample.contact == CONTACT_UP)
|
|
{
|
|
/* Pen is now up. Is the positional data valid? This is important to
|
|
* know because the release will be sent to the window based on its
|
|
* last positional data.
|
|
*/
|
|
|
|
if (sample.valid)
|
|
{
|
|
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID | TOUCH_POS_VALID;
|
|
}
|
|
else
|
|
{
|
|
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID;
|
|
}
|
|
}
|
|
else if (sample.contact == CONTACT_DOWN)
|
|
{
|
|
/* First contact */
|
|
|
|
report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | TOUCH_POS_VALID;
|
|
}
|
|
else /* if (sample->contact == CONTACT_MOVE) */
|
|
{
|
|
/* Movement of the same contact */
|
|
|
|
report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID;
|
|
}
|
|
|
|
iinfo(" id: %d\n", report->point[0].id);
|
|
iinfo(" flags: %02x\n", report->point[0].flags);
|
|
iinfo(" x: %d\n", report->point[0].x);
|
|
iinfo(" y: %d\n", report->point[0].y);
|
|
|
|
ret = SIZEOF_TOUCH_SAMPLE_S(1);
|
|
|
|
errout:
|
|
nxsem_post(&priv->devsem);
|
|
iinfo("Returning: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_ioctl
|
|
****************************************************************************/
|
|
|
|
static int max11802_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
|
{
|
|
FAR struct inode *inode;
|
|
FAR struct max11802_dev_s *priv;
|
|
int ret;
|
|
|
|
iinfo("cmd: %d arg: %ld\n", cmd, arg);
|
|
DEBUGASSERT(filep);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (FAR struct max11802_dev_s *)inode->i_private;
|
|
|
|
/* Get exclusive access to the driver data structure */
|
|
|
|
ret = nxsem_wait(&priv->devsem);
|
|
if (ret < 0)
|
|
{
|
|
/* This should only happen if the wait was canceled by an signal */
|
|
|
|
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
|
|
return ret;
|
|
}
|
|
|
|
/* Process the IOCTL by command */
|
|
|
|
switch (cmd)
|
|
{
|
|
case TSIOC_SETFREQUENCY: /* arg: Pointer to uint32_t frequency value */
|
|
{
|
|
FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg);
|
|
DEBUGASSERT(priv->config != NULL && ptr != NULL);
|
|
priv->config->frequency = SPI_SETFREQUENCY(priv->spi, *ptr);
|
|
}
|
|
break;
|
|
|
|
case TSIOC_GETFREQUENCY: /* arg: Pointer to uint32_t frequency value */
|
|
{
|
|
FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg);
|
|
DEBUGASSERT(priv->config != NULL && ptr != NULL);
|
|
*ptr = priv->config->frequency;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
nxsem_post(&priv->devsem);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_poll
|
|
****************************************************************************/
|
|
|
|
#ifndef CONFIG_DISABLE_POLL
|
|
static int max11802_poll(FAR struct file *filep, FAR struct pollfd *fds,
|
|
bool setup)
|
|
{
|
|
FAR struct inode *inode;
|
|
FAR struct max11802_dev_s *priv;
|
|
int ret;
|
|
int i;
|
|
|
|
iinfo("setup: %d\n", (int)setup);
|
|
DEBUGASSERT(filep && fds);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode && inode->i_private);
|
|
priv = (FAR struct max11802_dev_s *)inode->i_private;
|
|
|
|
/* Are we setting up the poll? Or tearing it down? */
|
|
|
|
ret = nxsem_wait(&priv->devsem);
|
|
if (ret < 0)
|
|
{
|
|
/* This should only happen if the wait was canceled by an signal */
|
|
|
|
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
|
|
return ret;
|
|
}
|
|
|
|
if (setup)
|
|
{
|
|
/* Ignore waits that do not include POLLIN */
|
|
|
|
if ((fds->events & POLLIN) == 0)
|
|
{
|
|
ret = -EDEADLK;
|
|
goto errout;
|
|
}
|
|
|
|
/* This is a request to set up the poll. Find an available
|
|
* slot for the poll structure reference
|
|
*/
|
|
|
|
for (i = 0; i < CONFIG_MAX11802_NPOLLWAITERS; i++)
|
|
{
|
|
/* Find an available slot */
|
|
|
|
if (!priv->fds[i])
|
|
{
|
|
/* Bind the poll structure and this slot */
|
|
|
|
priv->fds[i] = fds;
|
|
fds->priv = &priv->fds[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i >= CONFIG_MAX11802_NPOLLWAITERS)
|
|
{
|
|
fds->priv = NULL;
|
|
ret = -EBUSY;
|
|
goto errout;
|
|
}
|
|
|
|
/* Should we immediately notify on any of the requested events? */
|
|
|
|
if (priv->penchange)
|
|
{
|
|
max11802_notify(priv);
|
|
}
|
|
}
|
|
else if (fds->priv)
|
|
{
|
|
/* This is a request to tear down the poll. */
|
|
|
|
struct pollfd **slot = (struct pollfd **)fds->priv;
|
|
DEBUGASSERT(slot != NULL);
|
|
|
|
/* Remove all memory of the poll setup */
|
|
|
|
*slot = NULL;
|
|
fds->priv = NULL;
|
|
}
|
|
|
|
errout:
|
|
nxsem_post(&priv->devsem);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: max11802_register
|
|
*
|
|
* Description:
|
|
* Configure the MAX11802 to use the provided SPI device instance. This
|
|
* will register the driver as /dev/inputN where N is the minor device
|
|
* number
|
|
*
|
|
* Input Parameters:
|
|
* dev - An SPI driver instance
|
|
* config - Persistent board configuration data
|
|
* minor - The input device minor number
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned to indicate the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int max11802_register(FAR struct spi_dev_s *spi,
|
|
FAR struct max11802_config_s *config, int minor)
|
|
{
|
|
FAR struct max11802_dev_s *priv;
|
|
char devname[DEV_NAMELEN];
|
|
#ifdef CONFIG_MAX11802_MULTIPLE
|
|
irqstate_t flags;
|
|
#endif
|
|
int ret;
|
|
|
|
iinfo("spi: %p minor: %d\n", spi, minor);
|
|
|
|
/* Debug-only sanity checks */
|
|
|
|
DEBUGASSERT(spi != NULL && config != NULL && minor >= 0 && minor < 100);
|
|
|
|
/* Create and initialize a MAX11802 device driver instance */
|
|
|
|
#ifndef CONFIG_MAX11802_MULTIPLE
|
|
priv = &g_max11802;
|
|
#else
|
|
priv = (FAR struct max11802_dev_s *)kmm_malloc(sizeof(struct max11802_dev_s));
|
|
if (!priv)
|
|
{
|
|
ierr("ERROR: kmm_malloc(%d) failed\n", sizeof(struct max11802_dev_s));
|
|
return -ENOMEM;
|
|
}
|
|
#endif
|
|
|
|
/* Initialize the MAX11802 device driver instance */
|
|
|
|
memset(priv, 0, sizeof(struct max11802_dev_s));
|
|
priv->spi = spi; /* Save the SPI device handle */
|
|
priv->config = config; /* Save the board configuration */
|
|
priv->wdog = wd_create(); /* Create a watchdog timer */
|
|
priv->threshx = INVALID_THRESHOLD; /* Initialize thresholding logic */
|
|
priv->threshy = INVALID_THRESHOLD; /* Initialize thresholding logic */
|
|
|
|
/* Initialize semaphores */
|
|
|
|
nxsem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */
|
|
nxsem_init(&priv->waitsem, 0, 0); /* Initialize pen event wait semaphore */
|
|
|
|
/* The pen event semaphore is used for signaling and, hence, should not
|
|
* have priority inheritance enabled.
|
|
*/
|
|
|
|
nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
|
|
|
|
/* Make sure that interrupts are disabled */
|
|
|
|
config->clear(config);
|
|
config->enable(config, false);
|
|
|
|
/* Attach the interrupt handler */
|
|
|
|
ret = config->attach(config, max11802_interrupt);
|
|
if (ret < 0)
|
|
{
|
|
ierr("ERROR: Failed to attach interrupt\n");
|
|
goto errout_with_priv;
|
|
}
|
|
|
|
iinfo("Mode: %d Bits: 8 Frequency: %d\n",
|
|
CONFIG_MAX11802_SPIMODE, CONFIG_MAX11802_FREQUENCY);
|
|
|
|
/* Lock the SPI bus so that we have exclusive access */
|
|
|
|
max11802_lock(spi);
|
|
|
|
/* Configure MAX11802 registers */
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_MODE_WR);
|
|
(void)SPI_SEND(priv->spi, MAX11802_MODE);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_AVG_WR);
|
|
(void)SPI_SEND(priv->spi, MAX11802_AVG);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_SAMPLE_WR);
|
|
(void)SPI_SEND(priv->spi, MAX11802_SAMPLE);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_TIMING_WR);
|
|
(void)SPI_SEND(priv->spi, MAX11802_TIMING);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_DELAY_WR);
|
|
(void)SPI_SEND(priv->spi, MAX11802_DELAY);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_PULL_WR);
|
|
(void)SPI_SEND(priv->spi, MAX11802_PULL);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
/* Test that the device access was successful. */
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
(void)SPI_SEND(priv->spi, MAX11802_CMD_MODE_RD);
|
|
ret = SPI_SEND(priv->spi, 0);
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
|
|
|
|
/* Unlock the bus */
|
|
|
|
max11802_unlock(spi);
|
|
|
|
if (ret != MAX11802_MODE)
|
|
{
|
|
ierr("ERROR: max11802 mode readback failed: %02x\n", ret);
|
|
goto errout_with_priv;
|
|
}
|
|
|
|
/* Register the device as an input device */
|
|
|
|
(void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor);
|
|
iinfo("Registering %s\n", devname);
|
|
|
|
ret = register_driver(devname, &max11802_fops, 0666, priv);
|
|
if (ret < 0)
|
|
{
|
|
ierr("ERROR: register_driver() failed: %d\n", ret);
|
|
goto errout_with_priv;
|
|
}
|
|
|
|
/* If multiple MAX11802 devices are supported, then we will need to add
|
|
* this new instance to a list of device instances so that it can be
|
|
* found by the interrupt handler based on the recieved IRQ number.
|
|
*/
|
|
|
|
#ifdef CONFIG_MAX11802_MULTIPLE
|
|
flags = enter_critical_section();
|
|
priv->flink = g_max11802list;
|
|
g_max11802list = priv;
|
|
leave_critical_section(flags);
|
|
#endif
|
|
|
|
/* Schedule work to perform the initial sampling and to set the data
|
|
* availability conditions.
|
|
*/
|
|
|
|
ret = work_queue(HPWORK, &priv->work, max11802_worker, priv, 0);
|
|
if (ret != 0)
|
|
{
|
|
ierr("ERROR: Failed to queue work: %d\n", ret);
|
|
goto errout_with_priv;
|
|
}
|
|
|
|
/* And return success (?) */
|
|
|
|
return OK;
|
|
|
|
errout_with_priv:
|
|
nxsem_destroy(&priv->devsem);
|
|
#ifdef CONFIG_MAX11802_MULTIPLE
|
|
kmm_free(priv);
|
|
#endif
|
|
return ret;
|
|
}
|