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260 lines
6.5 KiB
260 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* htu21.c - Support for Measurement-Specialties |
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* htu21 temperature & humidity sensor |
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* and humidity part of MS8607 sensor |
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* |
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* Copyright (c) 2014 Measurement-Specialties |
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* |
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* (7-bit I2C slave address 0x40) |
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* |
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* Datasheet: |
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* http://www.meas-spec.com/downloads/HTU21D.pdf |
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* Datasheet: |
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* http://www.meas-spec.com/downloads/MS8607-02BA01.pdf |
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*/ |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/stat.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include "../common/ms_sensors/ms_sensors_i2c.h" |
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#define HTU21_RESET 0xFE |
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enum { |
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HTU21, |
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MS8607 |
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}; |
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static const int htu21_samp_freq[4] = { 20, 40, 70, 120 }; |
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/* String copy of the above const for readability purpose */ |
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static const char htu21_show_samp_freq[] = "20 40 70 120"; |
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static int htu21_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *channel, int *val, |
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int *val2, long mask) |
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{ |
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int ret, temperature; |
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unsigned int humidity; |
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struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_PROCESSED: |
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switch (channel->type) { |
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case IIO_TEMP: /* in milli °C */ |
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ret = ms_sensors_ht_read_temperature(dev_data, |
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&temperature); |
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if (ret) |
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return ret; |
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*val = temperature; |
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return IIO_VAL_INT; |
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case IIO_HUMIDITYRELATIVE: /* in milli %RH */ |
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ret = ms_sensors_ht_read_humidity(dev_data, |
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&humidity); |
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if (ret) |
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return ret; |
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*val = humidity; |
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return IIO_VAL_INT; |
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default: |
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return -EINVAL; |
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} |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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*val = htu21_samp_freq[dev_data->res_index]; |
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return IIO_VAL_INT; |
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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 htu21_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 ms_ht_dev *dev_data = iio_priv(indio_dev); |
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int i, ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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i = ARRAY_SIZE(htu21_samp_freq); |
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while (i-- > 0) |
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if (val == htu21_samp_freq[i]) |
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break; |
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if (i < 0) |
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return -EINVAL; |
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mutex_lock(&dev_data->lock); |
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dev_data->res_index = i; |
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ret = ms_sensors_write_resolution(dev_data, i); |
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mutex_unlock(&dev_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_chan_spec htu21_channels[] = { |
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{ |
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.type = IIO_TEMP, |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
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}, |
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{ |
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.type = IIO_HUMIDITYRELATIVE, |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
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} |
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}; |
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/* |
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* Meas Spec recommendation is to not read temperature |
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* on this driver part for MS8607 |
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*/ |
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static const struct iio_chan_spec ms8607_channels[] = { |
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{ |
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.type = IIO_HUMIDITYRELATIVE, |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
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} |
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}; |
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static ssize_t htu21_show_battery_low(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
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return ms_sensors_show_battery_low(dev_data, buf); |
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} |
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static ssize_t htu21_show_heater(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
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return ms_sensors_show_heater(dev_data, buf); |
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} |
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static ssize_t htu21_write_heater(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
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return ms_sensors_write_heater(dev_data, buf, len); |
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} |
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(htu21_show_samp_freq); |
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static IIO_DEVICE_ATTR(battery_low, S_IRUGO, |
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htu21_show_battery_low, NULL, 0); |
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static IIO_DEVICE_ATTR(heater_enable, S_IRUGO | S_IWUSR, |
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htu21_show_heater, htu21_write_heater, 0); |
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static struct attribute *htu21_attributes[] = { |
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&iio_const_attr_sampling_frequency_available.dev_attr.attr, |
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&iio_dev_attr_battery_low.dev_attr.attr, |
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&iio_dev_attr_heater_enable.dev_attr.attr, |
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NULL, |
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}; |
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static const struct attribute_group htu21_attribute_group = { |
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.attrs = htu21_attributes, |
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}; |
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static const struct iio_info htu21_info = { |
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.read_raw = htu21_read_raw, |
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.write_raw = htu21_write_raw, |
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.attrs = &htu21_attribute_group, |
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}; |
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static int htu21_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct ms_ht_dev *dev_data; |
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struct iio_dev *indio_dev; |
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int ret; |
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u64 serial_number; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_WRITE_BYTE_DATA | |
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I2C_FUNC_SMBUS_WRITE_BYTE | |
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I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { |
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dev_err(&client->dev, |
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"Adapter does not support some i2c transaction\n"); |
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return -EOPNOTSUPP; |
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} |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); |
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if (!indio_dev) |
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return -ENOMEM; |
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dev_data = iio_priv(indio_dev); |
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dev_data->client = client; |
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dev_data->res_index = 0; |
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mutex_init(&dev_data->lock); |
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indio_dev->info = &htu21_info; |
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indio_dev->name = id->name; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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if (id->driver_data == MS8607) { |
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indio_dev->channels = ms8607_channels; |
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indio_dev->num_channels = ARRAY_SIZE(ms8607_channels); |
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} else { |
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indio_dev->channels = htu21_channels; |
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indio_dev->num_channels = ARRAY_SIZE(htu21_channels); |
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} |
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i2c_set_clientdata(client, indio_dev); |
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ret = ms_sensors_reset(client, HTU21_RESET, 15000); |
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if (ret) |
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return ret; |
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ret = ms_sensors_read_serial(client, &serial_number); |
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if (ret) |
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return ret; |
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dev_info(&client->dev, "Serial number : %llx", serial_number); |
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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 htu21_id[] = { |
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{"htu21", HTU21}, |
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{"ms8607-humidity", MS8607}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, htu21_id); |
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static const struct of_device_id htu21_of_match[] = { |
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{ .compatible = "meas,htu21", }, |
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{ .compatible = "meas,ms8607-humidity", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, htu21_of_match); |
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static struct i2c_driver htu21_driver = { |
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.probe = htu21_probe, |
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.id_table = htu21_id, |
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.driver = { |
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.name = "htu21", |
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.of_match_table = htu21_of_match, |
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}, |
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}; |
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module_i2c_driver(htu21_driver); |
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MODULE_DESCRIPTION("Measurement-Specialties htu21 temperature and humidity driver"); |
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MODULE_AUTHOR("William Markezana <[email protected]>"); |
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MODULE_AUTHOR("Ludovic Tancerel <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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