// SPDX-License-Identifier: GPL-2.0+
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/*
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* hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
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*
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* Copyright (C) 2015, 2018
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* Author: Matt Ranostay <matt.ranostay@konsulko.com>
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*
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* Datasheets:
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* https://www.ti.com/product/HDC1000/datasheet
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* https://www.ti.com/product/HDC1008/datasheet
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* https://www.ti.com/product/HDC1010/datasheet
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* https://www.ti.com/product/HDC1050/datasheet
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* https://www.ti.com/product/HDC1080/datasheet
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/time.h>
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#define HDC100X_REG_TEMP 0x00
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#define HDC100X_REG_HUMIDITY 0x01
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#define HDC100X_REG_CONFIG 0x02
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#define HDC100X_REG_CONFIG_ACQ_MODE BIT(12)
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#define HDC100X_REG_CONFIG_HEATER_EN BIT(13)
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struct hdc100x_data {
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struct i2c_client *client;
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struct mutex lock;
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u16 config;
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/* integration time of the sensor */
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int adc_int_us[2];
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/* Ensure natural alignment of timestamp */
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struct {
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__be16 channels[2];
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s64 ts __aligned(8);
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} scan;
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};
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/* integration time in us */
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static const int hdc100x_int_time[][3] = {
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{ 6350, 3650, 0 }, /* IIO_TEMP channel*/
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{ 6500, 3850, 2500 }, /* IIO_HUMIDITYRELATIVE channel */
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};
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/* HDC100X_REG_CONFIG shift and mask values */
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static const struct {
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int shift;
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int mask;
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} hdc100x_resolution_shift[2] = {
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{ /* IIO_TEMP channel */
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.shift = 10,
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.mask = 1
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},
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{ /* IIO_HUMIDITYRELATIVE channel */
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.shift = 8,
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.mask = 3,
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},
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};
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static IIO_CONST_ATTR(temp_integration_time_available,
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"0.00365 0.00635");
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static IIO_CONST_ATTR(humidityrelative_integration_time_available,
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"0.0025 0.00385 0.0065");
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static IIO_CONST_ATTR(out_current_heater_raw_available,
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"0 1");
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static struct attribute *hdc100x_attributes[] = {
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&iio_const_attr_temp_integration_time_available.dev_attr.attr,
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&iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
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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 hdc100x_attribute_group = {
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.attrs = hdc100x_attributes,
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};
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static const struct iio_chan_spec hdc100x_channels[] = {
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{
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.type = IIO_TEMP,
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.address = HDC100X_REG_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.scan_index = 0,
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.scan_type = {
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.sign = 's',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_BE,
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},
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},
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{
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.type = IIO_HUMIDITYRELATIVE,
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.address = HDC100X_REG_HUMIDITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME),
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.scan_index = 1,
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.scan_type = {
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.sign = 'u',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_BE,
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},
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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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.scan_index = -1,
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},
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IIO_CHAN_SOFT_TIMESTAMP(2),
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};
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static const unsigned long hdc100x_scan_masks[] = {0x3, 0};
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static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
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{
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int tmp = (~mask & data->config) | val;
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int ret;
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ret = i2c_smbus_write_word_swapped(data->client,
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HDC100X_REG_CONFIG, tmp);
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if (!ret)
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data->config = tmp;
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return ret;
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}
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static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
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{
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int shift = hdc100x_resolution_shift[chan].shift;
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int ret = -EINVAL;
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int i;
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for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
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if (val2 && val2 == hdc100x_int_time[chan][i]) {
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ret = hdc100x_update_config(data,
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hdc100x_resolution_shift[chan].mask << shift,
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i << shift);
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if (!ret)
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data->adc_int_us[chan] = val2;
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break;
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}
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}
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return ret;
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}
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static int hdc100x_get_measurement(struct hdc100x_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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int delay = data->adc_int_us[chan->address] + 1*USEC_PER_MSEC;
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int ret;
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__be16 val;
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/* start measurement */
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ret = i2c_smbus_write_byte(client, chan->address);
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if (ret < 0) {
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dev_err(&client->dev, "cannot start measurement");
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return ret;
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}
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/* wait for integration time to pass */
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usleep_range(delay, delay + 1000);
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/* read measurement */
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ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));
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if (ret < 0) {
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dev_err(&client->dev, "cannot read sensor data\n");
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return ret;
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}
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return be16_to_cpu(val);
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}
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static int hdc100x_get_heater_status(struct hdc100x_data *data)
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{
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return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
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}
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static int hdc100x_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 hdc100x_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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mutex_lock(&data->lock);
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if (chan->type == IIO_CURRENT) {
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*val = hdc100x_get_heater_status(data);
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ret = IIO_VAL_INT;
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} else {
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret) {
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = hdc100x_get_measurement(data, chan);
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iio_device_release_direct_mode(indio_dev);
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if (ret >= 0) {
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*val = ret;
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ret = IIO_VAL_INT;
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}
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}
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mutex_unlock(&data->lock);
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return ret;
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}
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case IIO_CHAN_INFO_INT_TIME:
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*val = 0;
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*val2 = data->adc_int_us[chan->address];
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SCALE:
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if (chan->type == IIO_TEMP) {
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*val = 165000;
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*val2 = 65536;
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return IIO_VAL_FRACTIONAL;
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} else {
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*val = 100000;
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*val2 = 65536;
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return IIO_VAL_FRACTIONAL;
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}
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break;
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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 hdc100x_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 hdc100x_data *data = iio_priv(indio_dev);
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int ret = -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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if (val != 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = hdc100x_set_it_time(data, chan->address, val2);
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mutex_unlock(&data->lock);
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return ret;
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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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mutex_lock(&data->lock);
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ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
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val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
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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 int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
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{
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struct hdc100x_data *data = iio_priv(indio_dev);
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int ret;
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/* Buffer is enabled. First set ACQ Mode, then attach poll func */
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mutex_lock(&data->lock);
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ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
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HDC100X_REG_CONFIG_ACQ_MODE);
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mutex_unlock(&data->lock);
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return ret;
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}
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static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
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{
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struct hdc100x_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->lock);
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ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
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mutex_unlock(&data->lock);
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return ret;
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}
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static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = {
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.postenable = hdc100x_buffer_postenable,
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.predisable = hdc100x_buffer_predisable,
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};
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static irqreturn_t hdc100x_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct hdc100x_data *data = iio_priv(indio_dev);
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struct i2c_client *client = data->client;
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int delay = data->adc_int_us[0] + data->adc_int_us[1] + 2*USEC_PER_MSEC;
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int ret;
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/* dual read starts at temp register */
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mutex_lock(&data->lock);
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ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP);
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if (ret < 0) {
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dev_err(&client->dev, "cannot start measurement\n");
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goto err;
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}
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usleep_range(delay, delay + 1000);
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ret = i2c_master_recv(client, (u8 *)data->scan.channels, 4);
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if (ret < 0) {
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dev_err(&client->dev, "cannot read sensor data\n");
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goto err;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
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iio_get_time_ns(indio_dev));
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err:
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mutex_unlock(&data->lock);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static const struct iio_info hdc100x_info = {
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.read_raw = hdc100x_read_raw,
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.write_raw = hdc100x_write_raw,
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.attrs = &hdc100x_attribute_group,
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};
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static int hdc100x_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 hdc100x_data *data;
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int ret;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |
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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->name = dev_name(&client->dev);
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &hdc100x_info;
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indio_dev->channels = hdc100x_channels;
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indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
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indio_dev->available_scan_masks = hdc100x_scan_masks;
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/* be sure we are in a known state */
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hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
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hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
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hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
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ret = devm_iio_triggered_buffer_setup(&client->dev,
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indio_dev, NULL,
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hdc100x_trigger_handler,
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&hdc_buffer_setup_ops);
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if (ret < 0) {
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dev_err(&client->dev, "iio triggered buffer setup failed\n");
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return ret;
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}
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static const struct i2c_device_id hdc100x_id[] = {
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{ "hdc100x", 0 },
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{ "hdc1000", 0 },
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{ "hdc1008", 0 },
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{ "hdc1010", 0 },
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{ "hdc1050", 0 },
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{ "hdc1080", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, hdc100x_id);
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static const struct of_device_id hdc100x_dt_ids[] = {
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{ .compatible = "ti,hdc1000" },
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{ .compatible = "ti,hdc1008" },
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{ .compatible = "ti,hdc1010" },
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{ .compatible = "ti,hdc1050" },
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{ .compatible = "ti,hdc1080" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, hdc100x_dt_ids);
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static struct i2c_driver hdc100x_driver = {
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.driver = {
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.name = "hdc100x",
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.of_match_table = hdc100x_dt_ids,
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},
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.probe = hdc100x_probe,
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.id_table = hdc100x_id,
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};
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module_i2c_driver(hdc100x_driver);
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MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
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MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
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MODULE_LICENSE("GPL");
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