iio: chemical: add AMS iAQ-core support
Add support for AMS iAQ-core continuous and pulsed VOC sensors. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Matt Ranostay
Jonathan Cameron
parent
4d33615df5
commit
466df4d0c1
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@ -20,6 +20,7 @@ adi,adt7476 +/-1C TDM Extended Temp Range I.C
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adi,adt7490 +/-1C TDM Extended Temp Range I.C
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adi,adxl345 Three-Axis Digital Accelerometer
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adi,adxl346 Three-Axis Digital Accelerometer (backward-compatibility value "adi,adxl345" must be listed too)
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ams,iaq-core AMS iAQ-Core VOC Sensor
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at,24c08 i2c serial eeprom (24cxx)
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atmel,24c00 i2c serial eeprom (24cxx)
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atmel,24c01 i2c serial eeprom (24cxx)
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@ -4,6 +4,14 @@
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menu "Chemical Sensors"
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config IAQCORE
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tristate "AMS iAQ-Core VOC sensors"
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depends on I2C
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help
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Say Y here to build I2C interface support for the AMS
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iAQ-Core Continuous/Pulsed VOC (Volatile Organic Compounds)
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sensors
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config VZ89X
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tristate "SGX Sensortech MiCS VZ89X VOC sensor"
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depends on I2C
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@ -3,4 +3,5 @@
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#
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# When adding new entries keep the list in alphabetical order
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obj-$(CONFIG_IAQCORE) += ams-iaq-core.o
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obj-$(CONFIG_VZ89X) += vz89x.o
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@ -0,0 +1,200 @@
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/*
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* ams-iaq-core.c - Support for AMS iAQ-Core VOC sensors
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*
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* Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/mutex.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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#define AMS_IAQCORE_DATA_SIZE 9
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#define AMS_IAQCORE_VOC_CO2_IDX 0
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#define AMS_IAQCORE_VOC_RESISTANCE_IDX 1
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#define AMS_IAQCORE_VOC_TVOC_IDX 2
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struct ams_iaqcore_reading {
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__be16 co2_ppm;
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u8 status;
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__be32 resistance;
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__be16 voc_ppb;
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} __attribute__((__packed__));
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struct ams_iaqcore_data {
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struct i2c_client *client;
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struct mutex lock;
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unsigned long last_update;
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struct ams_iaqcore_reading buffer;
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};
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static const struct iio_chan_spec ams_iaqcore_channels[] = {
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{
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.type = IIO_CONCENTRATION,
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.channel2 = IIO_MOD_CO2,
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.modified = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.address = AMS_IAQCORE_VOC_CO2_IDX,
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},
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{
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.type = IIO_RESISTANCE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.address = AMS_IAQCORE_VOC_RESISTANCE_IDX,
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},
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{
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.type = IIO_CONCENTRATION,
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.channel2 = IIO_MOD_VOC,
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.modified = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.address = AMS_IAQCORE_VOC_TVOC_IDX,
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},
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};
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static int ams_iaqcore_read_measurement(struct ams_iaqcore_data *data)
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{
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struct i2c_client *client = data->client;
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int ret;
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struct i2c_msg msg = {
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.addr = client->addr,
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.flags = client->flags | I2C_M_RD,
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.len = AMS_IAQCORE_DATA_SIZE,
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.buf = (char *) &data->buffer,
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};
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ret = i2c_transfer(client->adapter, &msg, 1);
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return (ret == AMS_IAQCORE_DATA_SIZE) ? 0 : ret;
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}
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static int ams_iaqcore_get_measurement(struct ams_iaqcore_data *data)
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{
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int ret;
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/* sensor can only be polled once a second max per datasheet */
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if (!time_after(jiffies, data->last_update + HZ))
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return 0;
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ret = ams_iaqcore_read_measurement(data);
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if (ret < 0)
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return ret;
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data->last_update = jiffies;
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return 0;
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}
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static int ams_iaqcore_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 ams_iaqcore_data *data = iio_priv(indio_dev);
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int ret;
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if (mask != IIO_CHAN_INFO_PROCESSED)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = ams_iaqcore_get_measurement(data);
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if (ret)
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goto err_out;
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switch (chan->address) {
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case AMS_IAQCORE_VOC_CO2_IDX:
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*val = 0;
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*val2 = be16_to_cpu(data->buffer.co2_ppm);
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ret = IIO_VAL_INT_PLUS_MICRO;
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break;
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case AMS_IAQCORE_VOC_RESISTANCE_IDX:
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*val = be32_to_cpu(data->buffer.resistance);
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ret = IIO_VAL_INT;
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break;
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case AMS_IAQCORE_VOC_TVOC_IDX:
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*val = 0;
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*val2 = be16_to_cpu(data->buffer.voc_ppb);
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ret = IIO_VAL_INT_PLUS_NANO;
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break;
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default:
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ret = -EINVAL;
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}
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err_out:
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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_info ams_iaqcore_info = {
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.read_raw = ams_iaqcore_read_raw,
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.driver_module = THIS_MODULE,
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};
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static int ams_iaqcore_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 ams_iaqcore_data *data;
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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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/* so initial reading will complete */
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data->last_update = jiffies - HZ;
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &ams_iaqcore_info,
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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->channels = ams_iaqcore_channels;
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indio_dev->num_channels = ARRAY_SIZE(ams_iaqcore_channels);
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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 ams_iaqcore_id[] = {
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{ "ams-iaq-core", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ams_iaqcore_id);
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static const struct of_device_id ams_iaqcore_dt_ids[] = {
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{ .compatible = "ams,iaq-core" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ams_iaqcore_dt_ids);
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static struct i2c_driver ams_iaqcore_driver = {
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.driver = {
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.name = "ams-iaq-core",
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.of_match_table = of_match_ptr(ams_iaqcore_dt_ids),
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},
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.probe = ams_iaqcore_probe,
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.id_table = ams_iaqcore_id,
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};
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module_i2c_driver(ams_iaqcore_driver);
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MODULE_AUTHOR("Matt Ranostay <mranostay@gmail.com>");
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MODULE_DESCRIPTION("AMS iAQ-Core VOC sensors");
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MODULE_LICENSE("GPL v2");
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