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Gregory Nutt
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configs/freedom-kl25z/src/kl_adxl345.c
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289
configs/freedom-kl25z/src/kl_adxl345.c
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/************************************************************************************
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* configs/freedom-kl25z/src/kl_adxl345.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/input/adxl345.h>
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#include <arch/irq.h>
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#include "freedom-kl25z.h"
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#include "kl_gpio.h"
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifdef CONFIG_INPUT_ADXL345
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#ifndef CONFIG_INPUT
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# error "ADXL345 support requires CONFIG_INPUT"
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#endif
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#ifndef CONFIG_KL_SPI0
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# error "ADXL345 support requires CONFIG_KL_SPI0"
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#endif
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#ifndef CONFIG_ADXL345_SPI
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# error "Only the ADXL345 SPI interface is supported"
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#endif
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#ifdef CONFIG_ADXL345_I2C
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# error "Only the ADXL345 SPI interface is supported"
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#endif
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#ifndef CONFIG_ADXL345_FREQUENCY
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# define CONFIG_ADXL345_FREQUENCY 500000
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#endif
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#ifndef CONFIG_ADXL345_SPIDEV
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# define CONFIG_ADXL345_SPIDEV 0
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#endif
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#if CONFIG_ADXL345_SPIDEV != 0
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# error "CONFIG_ADXL345_SPIDEV must be zero"
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#endif
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#ifndef CONFIG_ADXL345_DEVMINOR
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# define CONFIG_ADXL345_DEVMINOR 0
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct kl_adxl345config_s
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{
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/* Configuration structure as seen by the ADXL345 driver */
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struct adxl345_config_s config;
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/* Additional private definitions only known to this driver */
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ADXL345_HANDLE handle; /* The ADXL345 driver handle */
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xcpt_t handler; /* The ADXL345 interrupt handler */
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};
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/****************************************************************************
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* Static Function Prototypes
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind callbacks
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* to isolate the ADXL345 driver from differences in GPIO interrupt handling
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* by varying boards and MCUs.
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*
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* attach - Attach the ADXL345 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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*/
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static int adxl345_attach(FAR struct adxl345_config_s *state, xcpt_t isr);
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static void adxl345_enable(FAR struct adxl345_config_s *state, bool enable);
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static void adxl345_clear(FAR struct adxl345_config_s *state);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the ADXL345
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* driver. This structure provides information about the configuration
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* of the ADXL345 and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writable because, under certain circumstances, the driver
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* may modify frequency or X plate resistance values.
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*/
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static struct kl_adxl345config_s g_adxl345config =
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{
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.config =
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{
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#ifdef CONFIG_ADXL345_I2C
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.address = ADXL345_ADDR1,
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#endif
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.frequency = CONFIG_ADXL345_FREQUENCY,
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.attach = adxl345_attach,
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.enable = adxl345_enable,
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.clear = adxl345_clear,
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},
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.handler = NULL,
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the ADXL345 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs.
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*
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* attach - Attach the ADXL345 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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*/
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static int adxl345_attach(FAR struct adxl345_config_s *state, xcpt_t isr)
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{
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FAR struct kl_adxl345config_s *priv = (FAR struct kl_adxl345config_s *)state;
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ivdbg("Saving handler %p\n", isr);
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DEBUGASSERT(priv);
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/* Just save the handler. We will use it when interrupts are enabled */
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priv->handler = isr;
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return OK;
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}
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static void adxl345_enable(FAR struct adxl345_config_s *state, bool enable)
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{
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FAR struct kl_adxl345config_s *priv = (FAR struct kl_adxl345config_s *)state;
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irqstate_t flags;
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/* Attach and enable, or detach and disable. Enabling and disabling GPIO
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* interrupts is a multi-step process so the safest thing is to keep
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* interrupts disabled during the reconfiguration.
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*/
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flags = irqsave();
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if (enable)
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{
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/* Configure the interrupt using the SAVED handler */
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kl_configgpio(GPIO_ADXL345_INT1);
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(void)kl_gpioirqattach(GPIO_ADXL345_INT1, priv->handler);
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kl_gpioirqenable(GPIO_ADXL345_INT1);
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}
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else
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{
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/* Configure the interrupt with a NULL handler to disable it */
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(void)kl_gpioirqattach(GPIO_ADXL345_INT1, NULL);
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kl_gpioirqdisable(GPIO_ADXL345_INT1);
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}
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irqrestore(flags);
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}
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static void adxl345_clear(FAR struct adxl345_config_s *state)
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{
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/* Does nothing */
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: adxl345_archinitialize
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*
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* Description:
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* Each board that supports an adxl345 device must provide this function.
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* This function is called by application-specific, setup logic to
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* configure the accelerometer device. This function will register the
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* driver as /dev/accelN where N is the minor device number.
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*
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* Input Parameters:
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int adxl345_archinitialize(int minor)
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{
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FAR struct spi_dev_s *dev;
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int ret;
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idbg("minor %d\n", minor);
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DEBUGASSERT(minor == 0);
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/* Check if we are already initialized */
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if (!g_adxl345config.handle)
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{
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ivdbg("Initializing\n");
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/* Configure the ADXL345 interrupt pin as an input */
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(void)kl_configgpio(GPIO_ADXL345_INT1);
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/* Get an instance of the I2C interface */
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dev = up_spiinitialize(CONFIG_ADXL345_SPIDEV);
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if (!dev)
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{
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idbg("Failed to initialize SPI bus %d\n", CONFIG_ADXL345_SPIDEV);
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return -ENODEV;
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}
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/* Instantiate the ADXL345 driver */
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g_adxl345config.handle =
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adxl345_instantiate(dev, (FAR struct adxl345_config_s *)&g_adxl345config);
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if (!g_adxl345config.handle)
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{
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idbg("Failed to instantiate the ADXL345 driver\n");
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return -ENODEV;
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}
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/* Initialize and register the ADXL345 driver */
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ret = adxl345_register(g_adxl345config.handle, CONFIG_ADXL345_DEVMINOR);
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if (ret < 0)
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{
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idbg("Failed to register STMPE driver: %d\n", ret);
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return -ENODEV;
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}
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}
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return OK;
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}
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#endif /* CONFIG_INPUT_ADXL345 */
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