7aa45305b7
Since VFS layer already contains sanity checks, so remove unnecessary lower half checks Signed-off-by: chao an <anchao@xiaomi.com>
444 lines
12 KiB
C
444 lines
12 KiB
C
/****************************************************************************
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* drivers/sensors/xen1210.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This driver is used to interface with Sensixs XEN1210 3D-board. */
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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 <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/sensors/xen1210.h>
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#include <nuttx/random.h>
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#include "xen1210.h"
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#if defined(CONFIG_SENSORS_XEN1210)
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Character driver methods */
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static ssize_t xen1210_read(FAR struct file *filep, FAR char *buffer,
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size_t len);
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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 g_xen1210fops =
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{
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NULL, /* open */
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NULL, /* close */
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xen1210_read, /* read */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: xen1210_configspi
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*
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* Description:
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*
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****************************************************************************/
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static inline void xen1210_configspi(FAR struct spi_dev_s *spi)
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{
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/* Configure SPI for the XEN1210 */
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SPI_SETMODE(spi, SPIDEV_MODE1);
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SPI_SETBITS(spi, 8);
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SPI_HWFEATURES(spi, 0);
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SPI_SETFREQUENCY(spi, XEN1210_SPI_MAXFREQUENCY);
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}
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/****************************************************************************
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* Name: xen1210_read
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*
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* Description:
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* Standard character driver read method.
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*
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****************************************************************************/
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static ssize_t xen1210_read(FAR struct file *filep, FAR char *buffer,
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size_t len)
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{
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FAR struct inode *inode;
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FAR struct xen1210_dev_s *priv;
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int ret;
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sninfo("len=%d\n", len);
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inode = filep->f_inode;
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DEBUGASSERT(inode->i_private);
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priv = (FAR struct xen1210_dev_s *)inode->i_private;
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/* Verify that the caller has provided a buffer large enough to receive
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* the magnetometer data.
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*/
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if (len < sizeof(struct xen1210_sample_s))
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{
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/* We could provide logic to break up a touch report into segments and
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* handle smaller reads... but why?
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*/
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snerr("Failed: Trying to read less bytes than sensor sample!\n");
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return -ENOSYS;
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}
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/* Get exclusive access to the driver data structure */
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ret = nxmutex_lock(&priv->lock);
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if (ret < 0)
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{
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/* This should only happen if the wait was canceled by an signal */
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snerr("Failed: Cannot get exclusive access to driver structure!\n");
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return ret;
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}
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sninfo("X = 0x%06" PRIX32 "\n", priv->sample.data_x);
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sninfo("Y = 0x%06" PRIX32 "\n", priv->sample.data_y);
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sninfo("Z = 0x%06" PRIX32 "\n", priv->sample.data_z);
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/* Return read sample */
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buffer = (FAR char *) &priv->sample;
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nxmutex_unlock(&priv->lock);
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return sizeof(struct xen1210_sample_s);
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}
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/****************************************************************************
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* Name: xen1210_worker
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*
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* Description:
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* This is the "bottom half" of the XEN1210 interrupt handler
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*
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****************************************************************************/
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static void xen1210_worker(FAR void *arg)
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{
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FAR struct xen1210_dev_s *priv = (FAR struct xen1210_dev_s *)arg;
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DEBUGASSERT(priv && priv->config);
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/* Read the sensors */
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xen1210_getdata(priv);
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/* Re-enable the XEN1210 GPIO interrupt */
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priv->config->enable(priv->config, true);
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}
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/****************************************************************************
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* Name: xen1210_interrupt
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*
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* Description:
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* The XEN1210 interrupt handler
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*
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****************************************************************************/
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static void xen1210_interrupt(FAR struct xen1210_config_s *config,
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FAR void *arg)
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{
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FAR struct xen1210_dev_s *priv = (FAR struct xen1210_dev_s *)arg;
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int ret;
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DEBUGASSERT(priv && priv->config == config);
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/* Disable further interrupts */
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config->enable(config, false);
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/* Check if interrupt work is already queue. If it is already busy, then
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* we already have interrupt processing in the pipeline and we need to do
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* nothing more.
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*/
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if (work_available(&priv->work))
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{
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/* Yes.. Transfer processing to the worker thread. Since XEN1210
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* interrupts are disabled while the work is pending, no special
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* action should be required to protect the work queue.
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*/
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ret = work_queue(HPWORK, &priv->work, xen1210_worker, priv, 0);
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if (ret != 0)
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{
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snerr("ERROR: Failed to queue work: %d\n", ret);
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}
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}
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/* Clear any pending interrupts and return success */
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config->clear(config);
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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: xen1210_instantiate
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*
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* Description:
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* Instantiate and configure the XEN1210 device driver to use the provided
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* SPI device instance.
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*
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* Input Parameters:
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* dev - An I2C or SPI driver instance
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* config - Persistent board configuration data
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*
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* Returned Value:
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* A non-zero handle is returned on success. This handle may then be used
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* to configure the XEN1210 driver as necessary. A NULL handle value is
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* returned on failure.
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*
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****************************************************************************/
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XEN1210_HANDLE xen1210_instantiate(FAR struct spi_dev_s *dev,
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FAR struct xen1210_config_s *config)
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{
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FAR struct xen1210_dev_s *priv;
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uint32_t regval;
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/* Allocate the XEN1210 driver instance */
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priv = (FAR struct xen1210_dev_s *)
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kmm_zalloc(sizeof(struct xen1210_dev_s));
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if (!priv)
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{
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snerr("ERROR: Failed to allocate the device structure!\n");
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return NULL;
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}
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/* Initialize the device state structure */
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nxmutex_init(&priv->lock);
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priv->config = config;
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priv->spi = dev;
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/* Attach the XEN1210 interrupt handler. */
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config->attach(config, (xen1210_handler_t)xen1210_interrupt,
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(FAR void *)priv);
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/* Device initialization sequence */
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/* Power off */
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regval = (XEN1210_POWEROFF);
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xen1210_putdata(priv, regval);
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/* Timing */
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regval = (XEN1210_TIMING);
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regval |= 0x131100;
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xen1210_putdata(priv, regval);
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/* Test */
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regval = (XEN1210_TEST);
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regval |= 0x003a00;
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xen1210_putdata(priv, regval);
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/* Power on */
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regval = (XEN1210_POWERON);
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xen1210_putdata(priv, regval); /* X axis */
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config->clear(config);
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config->enable(config, true);
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/* Return our private data structure as an opaque handle */
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return (XEN1210_HANDLE)priv;
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}
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/****************************************************************************
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* Name: xen1210_register
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*
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* Description:
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* This function will register the touchscreen driver as /dev/accelN where N
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* is the minor device number
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*
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* Input Parameters:
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* handle - The handle previously returned by xen1210_register
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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 xen1210_register(XEN1210_HANDLE handle, int minor)
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{
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FAR struct xen1210_dev_s *priv = (FAR struct xen1210_dev_s *)handle;
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char devname[DEV_NAMELEN];
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int ret;
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sninfo("handle=%p minor=%d\n", handle, minor);
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DEBUGASSERT(priv);
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/* Get exclusive access to the device structure */
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ret = nxmutex_lock(&priv->lock);
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if (ret < 0)
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{
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snerr("ERROR: nxsem_wait failed: %d\n", ret);
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return ret;
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}
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/* Register the character driver */
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snprintf(devname, sizeof(devname), DEV_FORMAT, minor);
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ret = register_driver(devname, &g_xen1210fops, 0444, priv);
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if (ret < 0)
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{
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snerr("ERROR: Failed to register driver %s: %d\n", devname, ret);
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nxmutex_unlock(&priv->lock);
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return ret;
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}
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/* Indicate that the accelerometer was successfully initialized */
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priv->status |= XEN1210_STAT_INITIALIZED; /* Accelerometer is initialized */
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nxmutex_unlock(&priv->lock);
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return ret;
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}
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/****************************************************************************
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* Name: xen1210_getdata
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*
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* Description:
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* Read 24-bit from XEN1210 buffer, read three times (3 sensors)
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*
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****************************************************************************/
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void xen1210_getdata(FAR struct xen1210_dev_s *priv)
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{
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uint32_t regval;
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/* If SPI bus is shared then lock and configure it */
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SPI_LOCK(priv->spi, true);
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xen1210_configspi(priv->spi);
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/* Select the XEN1210 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), true);
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/* Read three times 3 bytes = 24 bits * 3 */
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SPI_RECVBLOCK(priv->spi, ®val, 3);
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priv->sample.data_x = regval & 0xffffff;
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SPI_RECVBLOCK(priv->spi, ®val, 3);
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priv->sample.data_y = regval & 0xffffff;
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SPI_RECVBLOCK(priv->spi, ®val, 3);
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priv->sample.data_z = regval & 0xffffff;
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/* Deselect the XEN1210 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), false);
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/* Unlock bus */
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SPI_LOCK(priv->spi, false);
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#ifdef CONFIG_XEN1210_REGDEBUG
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_err("%02x->%02x\n", regaddr, regval);
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#endif
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/* Feed sensor data to entropy pool */
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add_sensor_randomness((priv->sample.data_x << 8) ^
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(priv->sample.data_y << 4) ^
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(priv->sample.data_z << 4));
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}
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/****************************************************************************
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* Name: xen1210_putdata
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*
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* Description:
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* Write 24-bit to XEN1210 buffer, write three times (3 sensors)
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*
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****************************************************************************/
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void xen1210_putdata(FAR struct xen1210_dev_s *priv, uint32_t regval)
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{
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#ifdef CONFIG_XEN1210_REGDEBUG
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_err("%02x<-%02x\n", regaddr, regval);
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#endif
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/* If SPI bus is shared then lock and configure it */
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SPI_LOCK(priv->spi, true);
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xen1210_configspi(priv->spi);
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/* Select the XEN1210 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), true);
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/* We need to write to 3 sensors in the daisy-chain */
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/* Write three times 3 bytes */
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SPI_SNDBLOCK(priv->spi, ®val, 3);
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SPI_SNDBLOCK(priv->spi, ®val, 3);
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SPI_SNDBLOCK(priv->spi, ®val, 3);
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/* Deselect the XEN1210 */
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SPI_SELECT(priv->spi, SPIDEV_ACCELEROMETER(0), false);
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/* Unlock bus */
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SPI_LOCK(priv->spi, false);
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}
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#endif /* CONFIG_SENSORS_XEN1210 */
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