394 lines
11 KiB
C
394 lines
11 KiB
C
/****************************************************************************
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* boards/arm/cxd56xx/drivers/sensors/bh1721fvc_scu.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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fixedmath.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 <arch/types.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/sensors/bh1721fvc.h>
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#include <nuttx/irq.h>
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#include <arch/chip/scu.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_BH1721FVC_SCU)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define BH1721FVC_ADDR 0x23 /* I2C Slave Address */
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#define BH1721FVC_BYTESPERSAMPLE 2
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#define BH1721FVC_ELEMENTSIZE 0
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/* BH1721FVC Opecode */
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#define BH1721FVC_POWERDOWN 0x00
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#define BH1721FVC_POWERON 0x01
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#define BH1721FVC_AUTORESOLUTION 0x10
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#ifndef itemsof
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# define itemsof(array) (sizeof(array)/sizeof(array[0]))
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#endif
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/****************************************************************************
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* Private Type Definitions
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****************************************************************************/
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/**
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* @brief Structure for bh1721fvc device
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*/
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struct bh1721fvc_dev_s
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{
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint8_t addr; /* I2C address */
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int port; /* I2C port */
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struct seq_s *seq; /* Sequencer instance */
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int minor; /* Minor device number */
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};
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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 int bh1721fvc_open(FAR struct file *filep);
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static int bh1721fvc_close(FAR struct file *filep);
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static ssize_t bh1721fvc_read(FAR struct file *filep,
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FAR char *buffer,
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size_t buflen);
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static ssize_t bh1721fvc_write(FAR struct file *filep,
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FAR const char *buffer,
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size_t buflen);
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static int bh1721fvc_ioctl(FAR struct file *filep,
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int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_bh1721fvcfops =
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{
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bh1721fvc_open, /* open */
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bh1721fvc_close, /* close */
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bh1721fvc_read, /* read */
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bh1721fvc_write, /* write */
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NULL, /* seek */
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bh1721fvc_ioctl, /* ioctl */
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NULL /* poll */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, NULL /* unlink */
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#endif
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};
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/* Take ambient light data. */
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static const uint16_t g_bh1721fvcinst[] =
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{
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SCU_INST_RECV(BH1721FVC_BYTESPERSAMPLE) | SCU_INST_LAST,
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};
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/* Reference count */
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static int g_refcnt = 0;
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/* Sequencer instance */
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static struct seq_s *g_seq = NULL;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bh1721fvc_writeopecode
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*
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* Description:
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* Write to BH1721FVC opecode
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*
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****************************************************************************/
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static void bh1721fvc_writeopecode(FAR struct bh1721fvc_dev_s *priv,
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uint8_t opecode)
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{
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uint16_t inst = SCU_INST_SEND(opecode) | SCU_INST_LAST;
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/* Send opecode */
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scu_i2ctransfer(priv->port, priv->addr, &inst, 1, NULL, 0);
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}
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/****************************************************************************
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* Name: bh1721fvc_seqinit
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*
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* Description:
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* Initialize SCU sequencer.
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*
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****************************************************************************/
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static int bh1721fvc_seqinit(FAR struct bh1721fvc_dev_s *priv)
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{
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DEBUGASSERT(g_seq == NULL);
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/* Open sequencer */
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g_seq = seq_open(SEQ_TYPE_NORMAL, SCU_BUS_I2C0);
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if (!g_seq)
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{
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return -ENOENT;
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}
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priv->seq = g_seq;
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seq_setaddress(priv->seq, priv->addr);
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/* Set instruction and sample data information to sequencer */
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seq_setinstruction(priv->seq,
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g_bh1721fvcinst,
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itemsof(g_bh1721fvcinst));
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seq_setsample(priv->seq,
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BH1721FVC_BYTESPERSAMPLE,
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0,
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BH1721FVC_ELEMENTSIZE,
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false);
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return OK;
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}
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/****************************************************************************
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* Name: bh1721fvc_open
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*
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* Description:
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* This function is called whenever the BH1721FVC device is opened.
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*
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****************************************************************************/
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static int bh1721fvc_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bh1721fvc_dev_s *priv = inode->i_private;
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if (g_refcnt == 0)
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{
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int ret;
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ret = bh1721fvc_seqinit(priv);
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if (ret < 0)
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{
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return ret;
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}
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bh1721fvc_writeopecode(priv, BH1721FVC_POWERON);
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bh1721fvc_writeopecode(priv, BH1721FVC_AUTORESOLUTION);
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}
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g_refcnt++;
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return OK;
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}
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/****************************************************************************
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* Name: bh1721fvc_close
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*
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* Description:
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* This routine is called when the BH1721FVC device is closed.
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*
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****************************************************************************/
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static int bh1721fvc_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bh1721fvc_dev_s *priv = inode->i_private;
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g_refcnt--;
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seq_ioctl(priv->seq, priv->minor, SCUIOC_STOP, 0);
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if (g_refcnt == 0)
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{
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bh1721fvc_writeopecode(priv, BH1721FVC_POWERDOWN);
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seq_close(g_seq);
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g_seq = NULL;
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}
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else
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{
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seq_ioctl(priv->seq, priv->minor, SCUIOC_FREEFIFO, 0);
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}
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return OK;
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}
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/****************************************************************************
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* Name: bh1721fvc_read
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****************************************************************************/
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static ssize_t bh1721fvc_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 = filep->f_inode;
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FAR struct bh1721fvc_dev_s *priv = inode->i_private;
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len = len / BH1721FVC_BYTESPERSAMPLE * BH1721FVC_BYTESPERSAMPLE;
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len = seq_read(priv->seq, priv->minor, buffer, len);
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return len;
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}
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/****************************************************************************
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* Name: bh1721fvc_write
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****************************************************************************/
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static ssize_t bh1721fvc_write(FAR struct file *filep,
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FAR const char *buffer,
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size_t buflen)
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{
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return -ENOSYS;
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}
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/****************************************************************************
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* Name: bh1721fvc_ioctl
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****************************************************************************/
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static int bh1721fvc_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bh1721fvc_dev_s *priv = inode->i_private;
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int ret = OK;
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switch (cmd)
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{
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default:
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{
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if (_SCUIOCVALID(cmd))
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{
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/* Redirect SCU commands */
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ret = seq_ioctl(priv->seq, priv->minor, cmd, arg);
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}
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else
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{
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snerr("Unrecognized cmd: %d\n", cmd);
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ret = - ENOTTY;
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}
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}
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break;
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}
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return ret;
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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: bh1721fvc_init
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*
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* Description:
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* Initialize the BH1721FVC device
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*
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* Input Parameters:
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* i2c - An instance of the I2C interface to use to communicate with
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* BH1721FVC
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* port - I2C port (0 or 1)
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int bh1721fvc_init(FAR struct i2c_master_s *i2c, int port)
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{
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return OK;
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}
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/****************************************************************************
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* Name: bh1721fvc_register
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*
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* Description:
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* Register the BH1721FVC ambient light sensor character device as
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* 'devpath'
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/light0"
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* minor - minor device number
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* i2c - An instance of the I2C interface to use to communicate with
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* BH1721FVC
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* port - I2C port (0 or 1)
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int bh1721fvc_register(FAR const char *devpath, int minor,
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FAR struct i2c_master_s *i2c, int port)
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{
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FAR struct bh1721fvc_dev_s *priv;
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char path[16];
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int ret;
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/* Initialize the BH1721FVC device structure */
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priv = (FAR struct bh1721fvc_dev_s *)
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kmm_malloc(sizeof(struct bh1721fvc_dev_s));
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if (!priv)
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{
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snerr("Failed to allocate instance\n");
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return -ENOMEM;
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}
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priv->i2c = i2c;
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priv->addr = BH1721FVC_ADDR;
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priv->port = port;
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priv->seq = NULL;
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priv->minor = minor;
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/* Register the character driver */
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snprintf(path, sizeof(path), "%s%d", devpath, minor);
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ret = register_driver(path, &g_bh1721fvcfops, 0666, priv);
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if (ret < 0)
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{
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snerr("Failed to register driver: %d\n", ret);
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kmm_free(priv);
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}
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return ret;
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}
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#endif /* CONFIG_I2C && CONFIG_SENSORS_BH1721FVC_SCU */
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