[linux-block.git] / drivers / iio / humidity / hdc100x.c

// 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>

#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 = 100;
			*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];
	int ret;
	s16 buf[8];  /* 2x s16 + padding + 8 byte timestamp */

	/* 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 *)buf, 4);
	if (ret < 0) {
		dev_err(&client->dev, "cannot read sensor data\n");
		goto err;
	}

	iio_push_to_buffers_with_timestamp(indio_dev, buf,
					   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");
Commit	Line	Data
d6ad8058	1	// SPDX-License-Identifier: GPL-2.0+
4839367d MR	2	/*
	3	* hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
	4	*
d6ad8058 MR	5	* Copyright (C) 2015, 2018
d6ad8058 MR	6	* Author: Matt Ranostay <matt.ranostay@konsulko.com>
4839367d	7	*
8f4c9575 MS	8	* Datasheets:
	9	* http://www.ti.com/product/HDC1000/datasheet
	10	* http://www.ti.com/product/HDC1008/datasheet
	11	* http://www.ti.com/product/HDC1010/datasheet
	12	* http://www.ti.com/product/HDC1050/datasheet
	13	* http://www.ti.com/product/HDC1080/datasheet
4839367d MR	14	*/
	15
	16	#include <linux/delay.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/i2c.h>
	20
	21	#include <linux/iio/iio.h>
	22	#include <linux/iio/sysfs.h>
16bf793f AS	23	#include <linux/iio/buffer.h>
	24	#include <linux/iio/trigger_consumer.h>
	25	#include <linux/iio/triggered_buffer.h>
4839367d MR	26
	27	#define HDC100X_REG_TEMP 0x00
	28	#define HDC100X_REG_HUMIDITY 0x01
	29
	30	#define HDC100X_REG_CONFIG 0x02
16bf793f	31	#define HDC100X_REG_CONFIG_ACQ_MODE BIT(12)
4839367d MR	32	#define HDC100X_REG_CONFIG_HEATER_EN BIT(13)
	33
	34	struct hdc100x_data {
	35	struct i2c_client *client;
	36	struct mutex lock;
	37	u16 config;
	38
	39	/* integration time of the sensor */
	40	int adc_int_us[2];
	41	};
	42
	43	/* integration time in us */
	44	static const int hdc100x_int_time[][3] = {
	45	{ 6350, 3650, 0 }, /* IIO_TEMP channel*/
	46	{ 6500, 3850, 2500 }, /* IIO_HUMIDITYRELATIVE channel */
	47	};
	48
	49	/* HDC100X_REG_CONFIG shift and mask values */
	50	static const struct {
	51	int shift;
	52	int mask;
	53	} hdc100x_resolution_shift[2] = {
	54	{ /* IIO_TEMP channel */
	55	.shift = 10,
	56	.mask = 1
	57	},
	58	{ /* IIO_HUMIDITYRELATIVE channel */
	59	.shift = 8,
0e35cf5c	60	.mask = 3,
4839367d MR	61	},
	62	};
	63
	64	static IIO_CONST_ATTR(temp_integration_time_available,
	65	"0.00365 0.00635");
	66
	67	static IIO_CONST_ATTR(humidityrelative_integration_time_available,
	68	"0.0025 0.00385 0.0065");
	69
	70	static IIO_CONST_ATTR(out_current_heater_raw_available,
	71	"0 1");
	72
	73	static struct attribute *hdc100x_attributes[] = {
	74	&iio_const_attr_temp_integration_time_available.dev_attr.attr,
	75	&iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
	76	&iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
	77	NULL
	78	};
	79
757cff86	80	static const struct attribute_group hdc100x_attribute_group = {
4839367d MR	81	.attrs = hdc100x_attributes,
	82	};
	83
	84	static const struct iio_chan_spec hdc100x_channels[] = {
	85	{
	86	.type = IIO_TEMP,
	87	.address = HDC100X_REG_TEMP,
	88	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	89	BIT(IIO_CHAN_INFO_SCALE) \|
	90	BIT(IIO_CHAN_INFO_INT_TIME) \|
	91	BIT(IIO_CHAN_INFO_OFFSET),
16bf793f AS	92	.scan_index = 0,
	93	.scan_type = {
	94	.sign = 's',
	95	.realbits = 16,
	96	.storagebits = 16,
	97	.endianness = IIO_BE,
	98	},
4839367d MR	99	},
	100	{
	101	.type = IIO_HUMIDITYRELATIVE,
	102	.address = HDC100X_REG_HUMIDITY,
	103	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	104	BIT(IIO_CHAN_INFO_SCALE) \|
16bf793f AS	105	BIT(IIO_CHAN_INFO_INT_TIME),
	106	.scan_index = 1,
	107	.scan_type = {
	108	.sign = 'u',
	109	.realbits = 16,
	110	.storagebits = 16,
	111	.endianness = IIO_BE,
	112	},
4839367d MR	113	},
	114	{
	115	.type = IIO_CURRENT,
	116	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	117	.extend_name = "heater",
	118	.output = 1,
16bf793f	119	.scan_index = -1,
4839367d	120	},
16bf793f	121	IIO_CHAN_SOFT_TIMESTAMP(2),
4839367d MR	122	};
4839367d MR	123
16bf793f AS	124	static const unsigned long hdc100x_scan_masks[] = {0x3, 0};
16bf793f AS	125
4839367d MR	126	static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
	127	{
	128	int tmp = (~mask & data->config) \| val;
	129	int ret;
	130
	131	ret = i2c_smbus_write_word_swapped(data->client,
	132	HDC100X_REG_CONFIG, tmp);
	133	if (!ret)
	134	data->config = tmp;
	135
	136	return ret;
	137	}
	138
	139	static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
	140	{
	141	int shift = hdc100x_resolution_shift[chan].shift;
	142	int ret = -EINVAL;
	143	int i;
	144
	145	for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
	146	if (val2 && val2 == hdc100x_int_time[chan][i]) {
	147	ret = hdc100x_update_config(data,
	148	hdc100x_resolution_shift[chan].mask << shift,
	149	i << shift);
	150	if (!ret)
	151	data->adc_int_us[chan] = val2;
	152	break;
	153	}
	154	}
	155
	156	return ret;
	157	}
	158
	159	static int hdc100x_get_measurement(struct hdc100x_data *data,
	160	struct iio_chan_spec const *chan)
	161	{
	162	struct i2c_client *client = data->client;
	163	int delay = data->adc_int_us[chan->address];
	164	int ret;
0d9dcf85	165	__be16 val;
4839367d MR	166
	167	/* start measurement */
	168	ret = i2c_smbus_write_byte(client, chan->address);
	169	if (ret < 0) {
	170	dev_err(&client->dev, "cannot start measurement");
	171	return ret;
	172	}
	173
	174	/* wait for integration time to pass */
	175	usleep_range(delay, delay + 1000);
	176
0d9dcf85 AS	177	/* read measurement */
0d9dcf85 AS	178	ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));
4839367d	179	if (ret < 0) {
0d9dcf85	180	dev_err(&client->dev, "cannot read sensor data\n");
4839367d MR	181	return ret;
4839367d MR	182	}
0d9dcf85	183	return be16_to_cpu(val);
4839367d MR	184	}
	185
	186	static int hdc100x_get_heater_status(struct hdc100x_data *data)
	187	{
	188	return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
	189	}
	190
	191	static int hdc100x_read_raw(struct iio_dev *indio_dev,
	192	struct iio_chan_spec const chan, int val,
	193	int *val2, long mask)
	194	{
	195	struct hdc100x_data *data = iio_priv(indio_dev);
	196
	197	switch (mask) {
	198	case IIO_CHAN_INFO_RAW: {
	199	int ret;
	200
	201	mutex_lock(&data->lock);
	202	if (chan->type == IIO_CURRENT) {
	203	*val = hdc100x_get_heater_status(data);
	204	ret = IIO_VAL_INT;
	205	} else {
16bf793f AS	206	ret = iio_device_claim_direct_mode(indio_dev);
	207	if (ret) {
	208	mutex_unlock(&data->lock);
	209	return ret;
	210	}
	211
4839367d	212	ret = hdc100x_get_measurement(data, chan);
16bf793f	213	iio_device_release_direct_mode(indio_dev);
4839367d MR	214	if (ret >= 0) {
	215	*val = ret;
	216	ret = IIO_VAL_INT;
	217	}
	218	}
	219	mutex_unlock(&data->lock);
	220	return ret;
	221	}
	222	case IIO_CHAN_INFO_INT_TIME:
	223	*val = 0;
	224	*val2 = data->adc_int_us[chan->address];
	225	return IIO_VAL_INT_PLUS_MICRO;
	226	case IIO_CHAN_INFO_SCALE:
	227	if (chan->type == IIO_TEMP) {
09bc0dda	228	*val = 165000;
94bef000	229	*val2 = 65536;
4839367d MR	230	return IIO_VAL_FRACTIONAL;
4839367d MR	231	} else {
94bef000 MR	232	*val = 100;
	233	*val2 = 65536;
	234	return IIO_VAL_FRACTIONAL;
4839367d MR	235	}
	236	break;
	237	case IIO_CHAN_INFO_OFFSET:
94bef000 MR	238	*val = -15887;
94bef000 MR	239	*val2 = 515151;
d3a21ce0	240	return IIO_VAL_INT_PLUS_MICRO;
4839367d MR	241	default:
	242	return -EINVAL;
	243	}
	244	}
	245
	246	static int hdc100x_write_raw(struct iio_dev *indio_dev,
	247	struct iio_chan_spec const *chan,
	248	int val, int val2, long mask)
	249	{
	250	struct hdc100x_data *data = iio_priv(indio_dev);
	251	int ret = -EINVAL;
	252
	253	switch (mask) {
	254	case IIO_CHAN_INFO_INT_TIME:
	255	if (val != 0)
	256	return -EINVAL;
	257
	258	mutex_lock(&data->lock);
	259	ret = hdc100x_set_it_time(data, chan->address, val2);
	260	mutex_unlock(&data->lock);
	261	return ret;
	262	case IIO_CHAN_INFO_RAW:
	263	if (chan->type != IIO_CURRENT \|\| val2 != 0)
	264	return -EINVAL;
	265
	266	mutex_lock(&data->lock);
	267	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
	268	val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
	269	mutex_unlock(&data->lock);
	270	return ret;
	271	default:
	272	return -EINVAL;
	273	}
	274	}
	275
16bf793f AS	276	static int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
	277	{
	278	struct hdc100x_data *data = iio_priv(indio_dev);
	279	int ret;
	280
	281	/* Buffer is enabled. First set ACQ Mode, then attach poll func */
	282	mutex_lock(&data->lock);
	283	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
	284	HDC100X_REG_CONFIG_ACQ_MODE);
	285	mutex_unlock(&data->lock);
	286	if (ret)
	287	return ret;
	288
	289	return iio_triggered_buffer_postenable(indio_dev);
	290	}
	291
	292	static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
	293	{
	294	struct hdc100x_data *data = iio_priv(indio_dev);
	295	int ret;
	296
	297	/* First detach poll func, then reset ACQ mode. OK to disable buffer */
	298	ret = iio_triggered_buffer_predisable(indio_dev);
	299	if (ret)
	300	return ret;
	301
	302	mutex_lock(&data->lock);
	303	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
	304	mutex_unlock(&data->lock);
	305
	306	return ret;
	307	}
	308
	309	static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = {
	310	.postenable = hdc100x_buffer_postenable,
	311	.predisable = hdc100x_buffer_predisable,
	312	};
	313
	314	static irqreturn_t hdc100x_trigger_handler(int irq, void *p)
	315	{
	316	struct iio_poll_func *pf = p;
	317	struct iio_dev *indio_dev = pf->indio_dev;
	318	struct hdc100x_data *data = iio_priv(indio_dev);
	319	struct i2c_client *client = data->client;
	320	int delay = data->adc_int_us[0] + data->adc_int_us[1];
	321	int ret;
	322	s16 buf[8]; /* 2x s16 + padding + 8 byte timestamp */
	323
	324	/* dual read starts at temp register */
	325	mutex_lock(&data->lock);
	326	ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP);
	327	if (ret < 0) {
	328	dev_err(&client->dev, "cannot start measurement\n");
	329	goto err;
	330	}
	331	usleep_range(delay, delay + 1000);
	332
	333	ret = i2c_master_recv(client, (u8 *)buf, 4);
	334	if (ret < 0) {
	335	dev_err(&client->dev, "cannot read sensor data\n");
	336	goto err;
	337	}
	338
	339	iio_push_to_buffers_with_timestamp(indio_dev, buf,
340	iio_get_time_ns(indio_dev));
341	err:
342	mutex_unlock(&data->lock);
343	iio_trigger_notify_done(indio_dev->trig);
344
345	return IRQ_HANDLED;
346	}
347
4839367d MR	348	static const struct iio_info hdc100x_info = {
	349	.read_raw = hdc100x_read_raw,
	350	.write_raw = hdc100x_write_raw,
	351	.attrs = &hdc100x_attribute_group,
4839367d MR	352	};
	353
	354	static int hdc100x_probe(struct i2c_client *client,
	355	const struct i2c_device_id *id)
	356	{
	357	struct iio_dev *indio_dev;
	358	struct hdc100x_data *data;
16bf793f	359	int ret;
4839367d	360
0d9dcf85 AS	361	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA \|
0d9dcf85 AS	362	I2C_FUNC_SMBUS_BYTE \| I2C_FUNC_I2C))
f8d9d3b4	363	return -EOPNOTSUPP;
4839367d MR	364
	365	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	366	if (!indio_dev)
	367	return -ENOMEM;
	368
	369	data = iio_priv(indio_dev);
	370	i2c_set_clientdata(client, indio_dev);
	371	data->client = client;
	372	mutex_init(&data->lock);
	373
	374	indio_dev->dev.parent = &client->dev;
	375	indio_dev->name = dev_name(&client->dev);
	376	indio_dev->modes = INDIO_DIRECT_MODE;
	377	indio_dev->info = &hdc100x_info;
	378
	379	indio_dev->channels = hdc100x_channels;
	380	indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
16bf793f	381	indio_dev->available_scan_masks = hdc100x_scan_masks;
4839367d MR	382
	383	/* be sure we are in a known state */
	384	hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
	385	hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
16bf793f AS	386	hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
	387
	388	ret = iio_triggered_buffer_setup(indio_dev, NULL,
	389	hdc100x_trigger_handler,
	390	&hdc_buffer_setup_ops);
	391	if (ret < 0) {
	392	dev_err(&client->dev, "iio triggered buffer setup failed\n");
	393	return ret;
	394	}
	395	ret = iio_device_register(indio_dev);
	396	if (ret < 0)
	397	iio_triggered_buffer_cleanup(indio_dev);
	398
	399	return ret;
	400	}
	401
	402	static int hdc100x_remove(struct i2c_client *client)
	403	{
	404	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	405
	406	iio_device_unregister(indio_dev);
	407	iio_triggered_buffer_cleanup(indio_dev);
4839367d	408
16bf793f	409	return 0;
4839367d MR	410	}
	411
	412	static const struct i2c_device_id hdc100x_id[] = {
	413	{ "hdc100x", 0 },
8f4c9575 MS	414	{ "hdc1000", 0 },
	415	{ "hdc1008", 0 },
	416	{ "hdc1010", 0 },
	417	{ "hdc1050", 0 },
	418	{ "hdc1080", 0 },
4839367d MR	419	{ }
	420	};
	421	MODULE_DEVICE_TABLE(i2c, hdc100x_id);
	422
a2d80de8 MS	423	static const struct of_device_id hdc100x_dt_ids[] = {
	424	{ .compatible = "ti,hdc1000" },
	425	{ .compatible = "ti,hdc1008" },
	426	{ .compatible = "ti,hdc1010" },
	427	{ .compatible = "ti,hdc1050" },
	428	{ .compatible = "ti,hdc1080" },
	429	{ }
	430	};
	431	MODULE_DEVICE_TABLE(of, hdc100x_dt_ids);
	432
4839367d MR	433	static struct i2c_driver hdc100x_driver = {
	434	.driver = {
	435	.name = "hdc100x",
a2d80de8	436	.of_match_table = of_match_ptr(hdc100x_dt_ids),
4839367d MR	437	},
4839367d MR	438	.probe = hdc100x_probe,
16bf793f	439	.remove = hdc100x_remove,
4839367d MR	440	.id_table = hdc100x_id,
	441	};
	442	module_i2c_driver(hdc100x_driver);
	443
d6ad8058	444	MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
4839367d MR	445	MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
4839367d MR	446	MODULE_LICENSE("GPL");