Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 452 insertions, 0 deletions

diff --git a/drivers/iio/humidity/hdc100x.c b/drivers/iio/humidity/hdc100x.c
new file mode 100644
index 000000000..51ad5a9ed
--- /dev/null
+++ b/drivers/iio/humidity/hdc100x.c
@@ -0,0 +1,452 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
+ *
+ * Copyright (C) 2015, 2018
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Datasheets:
+ * http://www.ti.com/product/HDC1000/datasheet
+ * http://www.ti.com/product/HDC1008/datasheet
+ * http://www.ti.com/product/HDC1010/datasheet
+ * http://www.ti.com/product/HDC1050/datasheet
+ * http://www.ti.com/product/HDC1080/datasheet
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#include <linux/time.h>
+
+#define HDC100X_REG_TEMP			0x00
+#define HDC100X_REG_HUMIDITY			0x01
+
+#define HDC100X_REG_CONFIG			0x02
+#define HDC100X_REG_CONFIG_ACQ_MODE		BIT(12)
+#define HDC100X_REG_CONFIG_HEATER_EN		BIT(13)
+
+struct hdc100x_data {
+	struct i2c_client *client;
+	struct mutex lock;
+	u16 config;
+
+	/* integration time of the sensor */
+	int adc_int_us[2];
+	/* Ensure natural alignment of timestamp */
+	struct {
+		__be16 channels[2];
+		s64 ts __aligned(8);
+	} scan;
+};
+
+/* integration time in us */
+static const int hdc100x_int_time[][3] = {
+	{ 6350, 3650, 0 },	/* IIO_TEMP channel*/
+	{ 6500, 3850, 2500 },	/* IIO_HUMIDITYRELATIVE channel */
+};
+
+/* HDC100X_REG_CONFIG shift and mask values */
+static const struct {
+	int shift;
+	int mask;
+} hdc100x_resolution_shift[2] = {
+	{ /* IIO_TEMP channel */
+		.shift = 10,
+		.mask = 1
+	},
+	{ /* IIO_HUMIDITYRELATIVE channel */
+		.shift = 8,
+		.mask = 3,
+	},
+};
+
+static IIO_CONST_ATTR(temp_integration_time_available,
+		"0.00365 0.00635");
+
+static IIO_CONST_ATTR(humidityrelative_integration_time_available,
+		"0.0025 0.00385 0.0065");
+
+static IIO_CONST_ATTR(out_current_heater_raw_available,
+		"0 1");
+
+static struct attribute *hdc100x_attributes[] = {
+	&iio_const_attr_temp_integration_time_available.dev_attr.attr,
+	&iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
+	&iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group hdc100x_attribute_group = {
+	.attrs = hdc100x_attributes,
+};
+
+static const struct iio_chan_spec hdc100x_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.address = HDC100X_REG_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_INT_TIME) |
+			BIT(IIO_CHAN_INFO_OFFSET),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 16,
+			.storagebits = 16,
+			.endianness = IIO_BE,
+		},
+	},
+	{
+		.type = IIO_HUMIDITYRELATIVE,
+		.address = HDC100X_REG_HUMIDITY,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_INT_TIME),
+		.scan_index = 1,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 16,
+			.storagebits = 16,
+			.endianness = IIO_BE,
+		},
+	},
+	{
+		.type = IIO_CURRENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.extend_name = "heater",
+		.output = 1,
+		.scan_index = -1,
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+static const unsigned long hdc100x_scan_masks[] = {0x3, 0};
+
+static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
+{
+	int tmp = (~mask & data->config) | val;
+	int ret;
+
+	ret = i2c_smbus_write_word_swapped(data->client,
+						HDC100X_REG_CONFIG, tmp);
+	if (!ret)
+		data->config = tmp;
+
+	return ret;
+}
+
+static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
+{
+	int shift = hdc100x_resolution_shift[chan].shift;
+	int ret = -EINVAL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
+		if (val2 && val2 == hdc100x_int_time[chan][i]) {
+			ret = hdc100x_update_config(data,
+				hdc100x_resolution_shift[chan].mask << shift,
+				i << shift);
+			if (!ret)
+				data->adc_int_us[chan] = val2;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static int hdc100x_get_measurement(struct hdc100x_data *data,
+				   struct iio_chan_spec const *chan)
+{
+	struct i2c_client *client = data->client;
+	int delay = data->adc_int_us[chan->address] + 1*USEC_PER_MSEC;
+	int ret;
+	__be16 val;
+
+	/* start measurement */
+	ret = i2c_smbus_write_byte(client, chan->address);
+	if (ret < 0) {
+		dev_err(&client->dev, "cannot start measurement");
+		return ret;
+	}
+
+	/* wait for integration time to pass */
+	usleep_range(delay, delay + 1000);
+
+	/* read measurement */
+	ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));
+	if (ret < 0) {
+		dev_err(&client->dev, "cannot read sensor data\n");
+		return ret;
+	}
+	return be16_to_cpu(val);
+}
+
+static int hdc100x_get_heater_status(struct hdc100x_data *data)
+{
+	return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
+}
+
+static int hdc100x_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int *val,
+			    int *val2, long mask)
+{
+	struct hdc100x_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW: {
+		int ret;
+
+		mutex_lock(&data->lock);
+		if (chan->type == IIO_CURRENT) {
+			*val = hdc100x_get_heater_status(data);
+			ret = IIO_VAL_INT;
+		} else {
+			ret = iio_device_claim_direct_mode(indio_dev);
+			if (ret) {
+				mutex_unlock(&data->lock);
+				return ret;
+			}
+
+			ret = hdc100x_get_measurement(data, chan);
+			iio_device_release_direct_mode(indio_dev);
+			if (ret >= 0) {
+				*val = ret;
+				ret = IIO_VAL_INT;
+			}
+		}
+		mutex_unlock(&data->lock);
+		return ret;
+	}
+	case IIO_CHAN_INFO_INT_TIME:
+		*val = 0;
+		*val2 = data->adc_int_us[chan->address];
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SCALE:
+		if (chan->type == IIO_TEMP) {
+			*val = 165000;
+			*val2 = 65536;
+			return IIO_VAL_FRACTIONAL;
+		} else {
+			*val = 100000;
+			*val2 = 65536;
+			return IIO_VAL_FRACTIONAL;
+		}
+		break;
+	case IIO_CHAN_INFO_OFFSET:
+		*val = -15887;
+		*val2 = 515151;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int hdc100x_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct hdc100x_data *data = iio_priv(indio_dev);
+	int ret = -EINVAL;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_INT_TIME:
+		if (val != 0)
+			return -EINVAL;
+
+		mutex_lock(&data->lock);
+		ret = hdc100x_set_it_time(data, chan->address, val2);
+		mutex_unlock(&data->lock);
+		return ret;
+	case IIO_CHAN_INFO_RAW:
+		if (chan->type != IIO_CURRENT || val2 != 0)
+			return -EINVAL;
+
+		mutex_lock(&data->lock);
+		ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
+					val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
+		mutex_unlock(&data->lock);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
+{
+	struct hdc100x_data *data = iio_priv(indio_dev);
+	int ret;
+
+	/* Buffer is enabled. First set ACQ Mode, then attach poll func */
+	mutex_lock(&data->lock);
+	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
+				    HDC100X_REG_CONFIG_ACQ_MODE);
+	mutex_unlock(&data->lock);
+	if (ret)
+		return ret;
+
+	return iio_triggered_buffer_postenable(indio_dev);
+}
+
+static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
+{
+	struct hdc100x_data *data = iio_priv(indio_dev);
+	int ret;
+
+	/* First detach poll func, then reset ACQ mode. OK to disable buffer */
+	ret = iio_triggered_buffer_predisable(indio_dev);
+	if (ret)
+		return ret;
+
+	mutex_lock(&data->lock);
+	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = {
+	.postenable  = hdc100x_buffer_postenable,
+	.predisable  = hdc100x_buffer_predisable,
+};
+
+static irqreturn_t hdc100x_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct hdc100x_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+	int delay = data->adc_int_us[0] + data->adc_int_us[1] + 2*USEC_PER_MSEC;
+	int ret;
+
+	/* dual read starts at temp register */
+	mutex_lock(&data->lock);
+	ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP);
+	if (ret < 0) {
+		dev_err(&client->dev, "cannot start measurement\n");
+		goto err;
+	}
+	usleep_range(delay, delay + 1000);
+
+	ret = i2c_master_recv(client, (u8 *)data->scan.channels, 4);
+	if (ret < 0) {
+		dev_err(&client->dev, "cannot read sensor data\n");
+		goto err;
+	}
+
+	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
+					   iio_get_time_ns(indio_dev));
+err:
+	mutex_unlock(&data->lock);
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static const struct iio_info hdc100x_info = {
+	.read_raw = hdc100x_read_raw,
+	.write_raw = hdc100x_write_raw,
+	.attrs = &hdc100x_attribute_group,
+};
+
+static int hdc100x_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct iio_dev *indio_dev;
+	struct hdc100x_data *data;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |
+				     I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
+		return -EOPNOTSUPP;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+	mutex_init(&data->lock);
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->name = dev_name(&client->dev);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &hdc100x_info;
+
+	indio_dev->channels = hdc100x_channels;
+	indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
+	indio_dev->available_scan_masks = hdc100x_scan_masks;
+
+	/* be sure we are in a known state */
+	hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
+	hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
+	hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
+
+	ret = iio_triggered_buffer_setup(indio_dev, NULL,
+					 hdc100x_trigger_handler,
+					 &hdc_buffer_setup_ops);
+	if (ret < 0) {
+		dev_err(&client->dev, "iio triggered buffer setup failed\n");
+		return ret;
+	}
+	ret = iio_device_register(indio_dev);
+	if (ret < 0)
+		iio_triggered_buffer_cleanup(indio_dev);
+
+	return ret;
+}
+
+static int hdc100x_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+	iio_device_unregister(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id hdc100x_id[] = {
+	{ "hdc100x", 0 },
+	{ "hdc1000", 0 },
+	{ "hdc1008", 0 },
+	{ "hdc1010", 0 },
+	{ "hdc1050", 0 },
+	{ "hdc1080", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, hdc100x_id);
+
+static const struct of_device_id hdc100x_dt_ids[] = {
+	{ .compatible = "ti,hdc1000" },
+	{ .compatible = "ti,hdc1008" },
+	{ .compatible = "ti,hdc1010" },
+	{ .compatible = "ti,hdc1050" },
+	{ .compatible = "ti,hdc1080" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hdc100x_dt_ids);
+
+static struct i2c_driver hdc100x_driver = {
+	.driver = {
+		.name	= "hdc100x",
+		.of_match_table = of_match_ptr(hdc100x_dt_ids),
+	},
+	.probe = hdc100x_probe,
+	.remove = hdc100x_remove,
+	.id_table = hdc100x_id,
+};
+module_i2c_driver(hdc100x_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
+MODULE_LICENSE("GPL");