drivers/iio/humidity/hdc100x.c


1
pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */// SPDX-License-Identifier: GPL-2.0
#include <linux/bcd.h>
#include <linux/export.h>

unsigned _bcd2bin(unsigned char val)
{
	return (val & 0x0f) + (val >> 4) * 10;
}
EXPORT_SYMBOL(_bcd2bin);

unsigned char _bin2bcd(unsigned val)
{
	return ((val / 10) << 4) + val % 10;
}
EXPORT_SYMBOL(_bin2bcd);
// 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:
 * https://www.ti.com/product/HDC1000/datasheet
 * https://www.ti.com/product/HDC1008/datasheet
 * https://www.ti.com/product/HDC1010/datasheet
 * https://www.ti.com/product/HDC1050/datasheet
 * https://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>

#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];
};

/* 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];
	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->