468 lines
14 KiB
C
468 lines
14 KiB
C
/****************************************************************************
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* drivers/sensors/isl29023.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 <sys/types.h>
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#include <errno.h>
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#include <debug.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.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/kmalloc.h>
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#include <nuttx/random.h>
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#include <nuttx/sensors/isl29023.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_ISL29023)
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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#ifndef CONFIG_ISL29023_I2C_FREQUENCY
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# define CONFIG_ISL29023_I2C_FREQUENCY 400000
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#endif
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/* Registers definitions */
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#define ISL29023_COMMAND_1 0x00
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#define ISL29023_COMMAND_2 0x01
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#define ISL29023_DATA_LSB 0x02
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#define ISL29023_DATA_MSB 0x03
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#define ISL29023_INT_LT_LSB 0x04
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#define ISL29023_INT_LT_MSB 0x05
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#define ISL29023_INT_HT_LSB 0x06
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#define ISL29023_INT_HT_MSB 0x07
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#define ISL29023_TEST 0x08
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/* Registers definitions */
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#define ISL29023_RESOLUTION_MASK 0x3
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#define ISL29023_RESOLUTION_SHIFT 0x2
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#define ISL29023_ALS_RANGE_MASK 0x3
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#define ISL29023_ALS_RANGE_SHIFT 0x0
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#define ISL29023_OP_MODE_MASK 0x7
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#define ISL29023_OP_MODE_SHIFT 0x5
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct isl29023_dev_s
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{
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FAR struct i2c_master_s *i2c;
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uint8_t addr; /* Address on the I2C bus */
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uint8_t op_mode; /* Defined by isl29023_operational_mode_e */
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uint32_t resolution; /* Sensor ADC res in counts (16..65536) */
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uint32_t range; /* Sensor range (1000..64000) */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C Helpers */
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static int isl29023_i2c_write(FAR struct isl29023_dev_s *dev,
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FAR const uint8_t *buffer, ssize_t buflen);
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static int isl29023_i2c_read(FAR struct isl29023_dev_s *dev,
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FAR uint8_t *buffer, ssize_t buflen);
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static int isl29023_read_reg(FAR struct isl29023_dev_s *dev,
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const uint8_t regaddr, uint8_t *buffer, size_t buflen);
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static int isl29023_read_lux(FAR struct isl29023_dev_s *dev,
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FAR struct isl29023_data_s *data);
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static int isl29023_set_op_mode(FAR struct isl29023_dev_s *dev,
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uint8_t mode);
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static int isl29023_set_resolution(FAR struct isl29023_dev_s *dev,
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uint8_t res_mode);
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static int isl29023_set_range(FAR struct isl29023_dev_s *dev,
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uint8_t range_mode);
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/* Driver methods */
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static ssize_t isl29023_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t isl29023_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 isl29023_ioctl(FAR struct file *filep, 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_isl29023fops =
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{
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NULL, /* open */
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NULL, /* close */
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isl29023_read, /* read */
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isl29023_write, /* write */
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NULL, /* seek */
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isl29023_ioctl, /* ioctl */
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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: isl29023_i2c_write
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*
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* Description:
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* Write to the I2C device.
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*
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****************************************************************************/
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static int isl29023_i2c_write(FAR struct isl29023_dev_s *dev,
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FAR const uint8_t *buffer, ssize_t buflen)
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{
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struct i2c_msg_s msg;
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int ret;
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/* Setup for the transfer */
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msg.frequency = CONFIG_ISL29023_I2C_FREQUENCY,
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msg.addr = dev->addr;
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msg.flags = 0;
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msg.buffer = (FAR uint8_t *)buffer; /* Override const */
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msg.length = buflen;
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/* Then perform the transfer. */
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ret = I2C_TRANSFER(dev->i2c, &msg, 1);
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return (ret >= 0) ? OK : ret;
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}
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/****************************************************************************
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* Name: isl29023_i2c_read
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*
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* Description:
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* Read from the I2C device.
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*
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****************************************************************************/
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static int isl29023_i2c_read(FAR struct isl29023_dev_s *dev,
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FAR uint8_t *buffer, ssize_t buflen)
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{
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struct i2c_msg_s msg;
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int ret;
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/* Setup for the transfer */
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msg.frequency = CONFIG_ISL29023_I2C_FREQUENCY,
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msg.addr = dev->addr,
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msg.flags = I2C_M_READ;
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msg.buffer = buffer;
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msg.length = buflen;
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/* Then perform the transfer. */
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ret = I2C_TRANSFER(dev->i2c, &msg, 1);
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return (ret >= 0) ? OK : ret;
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}
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/****************************************************************************
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* Name: isl29023_read_reg
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*
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* Description:
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* Read register from the I2C device.
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*
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****************************************************************************/
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static int isl29023_read_reg(FAR struct isl29023_dev_s *dev,
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const uint8_t regaddr, uint8_t *buffer,
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size_t buflen)
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{
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int ret;
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ret = isl29023_i2c_write(dev, ®addr, 1);
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if (ret < 0)
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{
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snerr("ERROR: i2c write failed: %d\n", ret);
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return ret;
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}
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ret = isl29023_i2c_read(dev, buffer, buflen);
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if (ret < 0)
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{
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snerr("ERROR: i2c read failed: %d\n", ret);
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return ret;
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}
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return ret;
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}
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/****************************************************************************
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* Name: isl29023_read
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****************************************************************************/
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static ssize_t isl29023_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct isl29023_dev_s *priv = inode->i_private;
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int ret;
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struct isl29023_data_s data;
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ret = isl29023_read_lux(priv, &data);
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if (ret < 0)
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{
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snerr("ERROR: failed to read the sensor: %d\n", ret);
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return (ssize_t)ret;
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}
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else
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{
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if (buflen < sizeof(data))
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{
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return -EIO;
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}
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memcpy(buffer, &data, sizeof(data));
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}
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return buflen;
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}
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/****************************************************************************
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* Name: isl29023_write
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****************************************************************************/
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static ssize_t isl29023_write(FAR struct file *filep, 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: isl29023_read_lux
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****************************************************************************/
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static int isl29023_read_lux(FAR struct isl29023_dev_s *dev,
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FAR struct isl29023_data_s *data)
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{
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int ret;
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uint8_t buffer[2];
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ret = isl29023_read_reg(dev, ISL29023_DATA_LSB, buffer, 2);
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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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data->raw = (buffer[1] << 8) | buffer[0];
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add_sensor_randomness(data->raw);
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uint32_t tmp = (data->raw * dev->range) / dev->resolution;
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data->lux = (uint16_t)tmp;
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sninfo("raw value %8x, lux: %5u\n", data->raw, data->lux);
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return OK;
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}
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/****************************************************************************
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* Name: isl29023_set_op_mode
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****************************************************************************/
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static int isl29023_set_op_mode(FAR struct isl29023_dev_s *dev, uint8_t mode)
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{
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uint8_t buffer[2];
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int ret;
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ret = isl29023_read_reg(dev, ISL29023_COMMAND_1, &buffer[1], 1);
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if (ret < 0)
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{
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snerr("ERROR: i2c read reg failed: %d\n", ret);
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return ret;
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}
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/* Clear the mode bits */
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buffer[1] &= ~(ISL29023_OP_MODE_MASK << ISL29023_OP_MODE_SHIFT);
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mode &= ISL29023_OP_MODE_MASK;
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/* Modify mode bits */
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buffer[1] |= mode << ISL29023_OP_MODE_SHIFT;
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buffer[0] = ISL29023_COMMAND_1;
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dev->op_mode = mode;
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sninfo("mode: %x\n", dev->op_mode);
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return isl29023_i2c_write(dev, buffer, 2);
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}
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/****************************************************************************
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* Name: isl29023_set_resolution
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****************************************************************************/
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static int isl29023_set_resolution(FAR struct isl29023_dev_s *dev,
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uint8_t res_mode)
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{
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uint8_t buffer[2];
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int ret;
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ret = isl29023_read_reg(dev, ISL29023_COMMAND_2, &buffer[1], 1);
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if (ret < 0)
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{
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snerr("ERROR: i2c read reg failed: %d\n", ret);
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return ret;
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}
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/* Clear the mode bits */
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buffer[1] &= ~(ISL29023_RESOLUTION_MASK << ISL29023_RESOLUTION_SHIFT);
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res_mode &= ISL29023_RESOLUTION_MASK;
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/* Modify mode bits */
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buffer[1] |= res_mode << ISL29023_RESOLUTION_SHIFT;
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buffer[0] = ISL29023_COMMAND_2;
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dev->resolution = 1u << (16u - res_mode * 4u);
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sninfo("resolution: %" PRIu32 "\n", dev->resolution);
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return isl29023_i2c_write(dev, buffer, 2);
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}
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/****************************************************************************
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* Name: isl29023_set_resolution
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****************************************************************************/
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static int isl29023_set_range(FAR struct isl29023_dev_s *dev,
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uint8_t range_mode)
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{
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uint8_t buffer[2];
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int ret;
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ret = isl29023_read_reg(dev, ISL29023_COMMAND_2, &buffer[1], 1);
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if (ret < 0)
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{
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snerr("ERROR: i2c read reg failed: %d\n", ret);
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return ret;
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}
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/* Clear the mode bits */
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buffer[1] &= ~(ISL29023_ALS_RANGE_MASK << ISL29023_ALS_RANGE_SHIFT);
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/* Modify mode bits */
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range_mode &= ISL29023_ALS_RANGE_MASK;
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buffer[1] |= range_mode << ISL29023_ALS_RANGE_SHIFT;
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buffer[0] = ISL29023_COMMAND_2;
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dev->range = 1000u * (1u << range_mode) * (1u << range_mode);
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sninfo("range: %" PRIu32 "\n", dev->range);
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return isl29023_i2c_write(dev, buffer, 2);
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}
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/****************************************************************************
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* Name: isl29023_ioctl
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****************************************************************************/
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static int isl29023_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct isl29023_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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/* Write to the COMMAND1 register. Arg: uint8_t value */
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case SNIOC_SET_OPERATIONAL_MODE:
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ret = isl29023_set_op_mode(priv, (uint8_t)arg);
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sninfo("Set operation mode %d with result %d\n", (uint8_t)arg, ret);
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break;
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/* Write to the COMMAND2 register. Arg: uint8_t value */
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case SNIOC_SET_RESOLUTION:
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ret = isl29023_set_resolution(priv, (uint8_t)arg);
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sninfo("Set resolution mode %d with result %d\n", (uint8_t)arg, ret);
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break;
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/* Write to the COMMAND2 register. Arg: uint8_t value */
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case SNIOC_SET_RANGE:
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ret = isl29023_set_range(priv, (uint8_t)arg);
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sninfo("Set range mode %d with result %d\n", (uint8_t)arg, ret);
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break;
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default:
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sninfo("Unrecognized cmd: 0x%04x\n", cmd);
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ret = -ENOTTY;
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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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int isl29023_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
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uint8_t addr)
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{
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FAR struct isl29023_dev_s *priv;
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int ret;
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priv = (FAR struct isl29023_dev_s *)
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kmm_malloc(sizeof(struct isl29023_dev_s));
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if (priv == NULL)
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{
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snerr("ERROR: 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 = addr;
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priv->resolution = 0x10000;
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priv->range = 64000;
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priv->op_mode = ISL29023_OP_MODE_POWER_DOWN;
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/* Register the character driver */
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ret = register_driver(devpath, &g_isl29023fops, 0666, priv);
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if (ret < 0)
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{
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snerr("ERROR: 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_ISL29023 */
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