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430 lines
10 KiB
430 lines
10 KiB
// 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 <[email protected]> |
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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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#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]; |
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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]; |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver"); |
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MODULE_LICENSE("GPL");
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