// SPDX-License-Identifier: GPL-2.0+
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/*
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* hdc2010.c - Support for the TI HDC2010 and HDC2080
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* temperature + relative humidity sensors
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*
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* Copyright (C) 2020 Norphonic AS
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* Author: Eugene Zaikonnikov <ez@norphonic.com>
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*
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* Datasheet: https://www.ti.com/product/HDC2010/datasheet
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* Datasheet: https://www.ti.com/product/HDC2080/datasheet
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/bitops.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define HDC2010_REG_TEMP_LOW 0x00
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#define HDC2010_REG_TEMP_HIGH 0x01
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#define HDC2010_REG_HUMIDITY_LOW 0x02
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#define HDC2010_REG_HUMIDITY_HIGH 0x03
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#define HDC2010_REG_INTERRUPT_DRDY 0x04
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#define HDC2010_REG_TEMP_MAX 0x05
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#define HDC2010_REG_HUMIDITY_MAX 0x06
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#define HDC2010_REG_INTERRUPT_EN 0x07
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#define HDC2010_REG_TEMP_OFFSET_ADJ 0x08
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#define HDC2010_REG_HUMIDITY_OFFSET_ADJ 0x09
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#define HDC2010_REG_TEMP_THR_L 0x0a
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#define HDC2010_REG_TEMP_THR_H 0x0b
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#define HDC2010_REG_RH_THR_L 0x0c
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#define HDC2010_REG_RH_THR_H 0x0d
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#define HDC2010_REG_RESET_DRDY_INT_CONF 0x0e
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#define HDC2010_REG_MEASUREMENT_CONF 0x0f
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#define HDC2010_MEAS_CONF GENMASK(2, 1)
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#define HDC2010_MEAS_TRIG BIT(0)
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#define HDC2010_HEATER_EN BIT(3)
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#define HDC2010_AMM GENMASK(6, 4)
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struct hdc2010_data {
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struct i2c_client *client;
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struct mutex lock;
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u8 measurement_config;
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u8 interrupt_config;
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u8 drdy_config;
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};
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enum hdc2010_addr_groups {
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HDC2010_GROUP_TEMP = 0,
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HDC2010_GROUP_HUMIDITY,
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};
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struct hdc2010_reg_record {
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unsigned long primary;
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unsigned long peak;
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};
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static const struct hdc2010_reg_record hdc2010_reg_translation[] = {
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[HDC2010_GROUP_TEMP] = {
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.primary = HDC2010_REG_TEMP_LOW,
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.peak = HDC2010_REG_TEMP_MAX,
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},
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[HDC2010_GROUP_HUMIDITY] = {
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.primary = HDC2010_REG_HUMIDITY_LOW,
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.peak = HDC2010_REG_HUMIDITY_MAX,
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},
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};
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static IIO_CONST_ATTR(out_current_heater_raw_available, "0 1");
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static struct attribute *hdc2010_attributes[] = {
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&iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group hdc2010_attribute_group = {
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.attrs = hdc2010_attributes,
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};
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static const struct iio_chan_spec hdc2010_channels[] = {
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{
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.type = IIO_TEMP,
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.address = HDC2010_GROUP_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_PEAK) |
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BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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{
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.type = IIO_HUMIDITYRELATIVE,
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.address = HDC2010_GROUP_HUMIDITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_PEAK) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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{
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.type = IIO_CURRENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.extend_name = "heater",
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.output = 1,
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},
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};
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static int hdc2010_update_drdy_config(struct hdc2010_data *data,
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char mask, char val)
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{
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u8 tmp = (~mask & data->drdy_config) | val;
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int ret;
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ret = i2c_smbus_write_byte_data(data->client,
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HDC2010_REG_RESET_DRDY_INT_CONF, tmp);
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if (ret)
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return ret;
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data->drdy_config = tmp;
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return 0;
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}
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static int hdc2010_get_prim_measurement_word(struct hdc2010_data *data,
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struct iio_chan_spec const *chan)
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{
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struct i2c_client *client = data->client;
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s32 ret;
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ret = i2c_smbus_read_word_data(client,
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hdc2010_reg_translation[chan->address].primary);
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if (ret < 0)
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dev_err(&client->dev, "Could not read sensor measurement word\n");
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return ret;
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}
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static int hdc2010_get_peak_measurement_byte(struct hdc2010_data *data,
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struct iio_chan_spec const *chan)
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{
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struct i2c_client *client = data->client;
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s32 ret;
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ret = i2c_smbus_read_byte_data(client,
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hdc2010_reg_translation[chan->address].peak);
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if (ret < 0)
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dev_err(&client->dev, "Could not read sensor measurement byte\n");
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return ret;
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}
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static int hdc2010_get_heater_status(struct hdc2010_data *data)
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{
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return !!(data->drdy_config & HDC2010_HEATER_EN);
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}
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static int hdc2010_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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struct hdc2010_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW: {
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int ret;
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if (chan->type == IIO_CURRENT) {
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*val = hdc2010_get_heater_status(data);
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return IIO_VAL_INT;
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}
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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mutex_lock(&data->lock);
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ret = hdc2010_get_prim_measurement_word(data, chan);
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mutex_unlock(&data->lock);
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iio_device_release_direct_mode(indio_dev);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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}
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case IIO_CHAN_INFO_PEAK: {
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int ret;
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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mutex_lock(&data->lock);
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ret = hdc2010_get_peak_measurement_byte(data, chan);
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mutex_unlock(&data->lock);
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iio_device_release_direct_mode(indio_dev);
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if (ret < 0)
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return ret;
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/* Scaling up the value so we can use same offset as RAW */
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*val = ret * 256;
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return IIO_VAL_INT;
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}
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case IIO_CHAN_INFO_SCALE:
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*val2 = 65536;
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if (chan->type == IIO_TEMP)
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*val = 165000;
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else
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*val = 100000;
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return IIO_VAL_FRACTIONAL;
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case IIO_CHAN_INFO_OFFSET:
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*val = -15887;
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*val2 = 515151;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int hdc2010_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct hdc2010_data *data = iio_priv(indio_dev);
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int new, ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (chan->type != IIO_CURRENT || val2 != 0)
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return -EINVAL;
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switch (val) {
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case 1:
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new = HDC2010_HEATER_EN;
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break;
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case 0:
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new = 0;
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break;
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default:
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return -EINVAL;
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}
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mutex_lock(&data->lock);
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ret = hdc2010_update_drdy_config(data, HDC2010_HEATER_EN, new);
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mutex_unlock(&data->lock);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info hdc2010_info = {
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.read_raw = hdc2010_read_raw,
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.write_raw = hdc2010_write_raw,
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.attrs = &hdc2010_attribute_group,
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};
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static int hdc2010_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct iio_dev *indio_dev;
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struct hdc2010_data *data;
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u8 tmp;
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
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return -EOPNOTSUPP;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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/*
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* As DEVICE ID register does not differentiate between
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* HDC2010 and HDC2080, we have the name hardcoded
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*/
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indio_dev->name = "hdc2010";
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &hdc2010_info;
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indio_dev->channels = hdc2010_channels;
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indio_dev->num_channels = ARRAY_SIZE(hdc2010_channels);
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/* Enable Automatic Measurement Mode at 5Hz */
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ret = hdc2010_update_drdy_config(data, HDC2010_AMM, HDC2010_AMM);
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if (ret)
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return ret;
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/*
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* We enable both temp and humidity measurement.
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* However the measurement won't start even in AMM until triggered.
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*/
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tmp = (data->measurement_config & ~HDC2010_MEAS_CONF) |
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HDC2010_MEAS_TRIG;
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ret = i2c_smbus_write_byte_data(client, HDC2010_REG_MEASUREMENT_CONF, tmp);
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if (ret) {
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dev_warn(&client->dev, "Unable to set up measurement\n");
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if (hdc2010_update_drdy_config(data, HDC2010_AMM, 0))
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dev_warn(&client->dev, "Unable to restore default AMM\n");
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return ret;
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}
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data->measurement_config = tmp;
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return iio_device_register(indio_dev);
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}
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static int hdc2010_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct hdc2010_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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/* Disable Automatic Measurement Mode */
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if (hdc2010_update_drdy_config(data, HDC2010_AMM, 0))
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dev_warn(&client->dev, "Unable to restore default AMM\n");
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return 0;
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}
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static const struct i2c_device_id hdc2010_id[] = {
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{ "hdc2010" },
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{ "hdc2080" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, hdc2010_id);
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static const struct of_device_id hdc2010_dt_ids[] = {
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{ .compatible = "ti,hdc2010" },
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{ .compatible = "ti,hdc2080" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, hdc2010_dt_ids);
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static struct i2c_driver hdc2010_driver = {
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.driver = {
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.name = "hdc2010",
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.of_match_table = hdc2010_dt_ids,
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},
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.probe = hdc2010_probe,
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.remove = hdc2010_remove,
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.id_table = hdc2010_id,
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};
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module_i2c_driver(hdc2010_driver);
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MODULE_AUTHOR("Eugene Zaikonnikov <ez@norphonic.com>");
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MODULE_DESCRIPTION("TI HDC2010 humidity and temperature sensor driver");
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MODULE_LICENSE("GPL");
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