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

/*
 * hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
 *
 * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * 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 <mranostay@gmail.com>");
MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
4839367d MR	1	/*
	2	* hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
	3	*
	4	* Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
8f4c9575 MS	16	* Datasheets:
	17	* http://www.ti.com/product/HDC1000/datasheet
	18	* http://www.ti.com/product/HDC1008/datasheet
	19	* http://www.ti.com/product/HDC1010/datasheet
	20	* http://www.ti.com/product/HDC1050/datasheet
	21	* http://www.ti.com/product/HDC1080/datasheet
4839367d MR	22	*/
	23
	24	#include <linux/delay.h>
	25	#include <linux/module.h>
	26	#include <linux/init.h>
	27	#include <linux/i2c.h>
	28
	29	#include <linux/iio/iio.h>
	30	#include <linux/iio/sysfs.h>
16bf793f AS	31	#include <linux/iio/buffer.h>
	32	#include <linux/iio/trigger_consumer.h>
	33	#include <linux/iio/triggered_buffer.h>
4839367d MR	34
	35	#define HDC100X_REG_TEMP 0x00
	36	#define HDC100X_REG_HUMIDITY 0x01
	37
	38	#define HDC100X_REG_CONFIG 0x02
16bf793f	39	#define HDC100X_REG_CONFIG_ACQ_MODE BIT(12)
4839367d MR	40	#define HDC100X_REG_CONFIG_HEATER_EN BIT(13)
	41
	42	struct hdc100x_data {
	43	struct i2c_client *client;
	44	struct mutex lock;
	45	u16 config;
	46
	47	/* integration time of the sensor */
	48	int adc_int_us[2];
	49	};
	50
	51	/* integration time in us */
	52	static const int hdc100x_int_time[][3] = {
	53	{ 6350, 3650, 0 }, /* IIO_TEMP channel*/
	54	{ 6500, 3850, 2500 }, /* IIO_HUMIDITYRELATIVE channel */
	55	};
	56
	57	/* HDC100X_REG_CONFIG shift and mask values */
	58	static const struct {
	59	int shift;
	60	int mask;
	61	} hdc100x_resolution_shift[2] = {
	62	{ /* IIO_TEMP channel */
	63	.shift = 10,
	64	.mask = 1
	65	},
	66	{ /* IIO_HUMIDITYRELATIVE channel */
	67	.shift = 8,
0e35cf5c	68	.mask = 3,
4839367d MR	69	},
	70	};
	71
	72	static IIO_CONST_ATTR(temp_integration_time_available,
	73	"0.00365 0.00635");
	74
	75	static IIO_CONST_ATTR(humidityrelative_integration_time_available,
	76	"0.0025 0.00385 0.0065");
	77
	78	static IIO_CONST_ATTR(out_current_heater_raw_available,
	79	"0 1");
	80
	81	static struct attribute *hdc100x_attributes[] = {
	82	&iio_const_attr_temp_integration_time_available.dev_attr.attr,
	83	&iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
	84	&iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
	85	NULL
	86	};
	87
757cff86	88	static const struct attribute_group hdc100x_attribute_group = {
4839367d MR	89	.attrs = hdc100x_attributes,
	90	};
	91
	92	static const struct iio_chan_spec hdc100x_channels[] = {
	93	{
	94	.type = IIO_TEMP,
	95	.address = HDC100X_REG_TEMP,
	96	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	97	BIT(IIO_CHAN_INFO_SCALE) \|
	98	BIT(IIO_CHAN_INFO_INT_TIME) \|
	99	BIT(IIO_CHAN_INFO_OFFSET),
16bf793f AS	100	.scan_index = 0,
	101	.scan_type = {
	102	.sign = 's',
	103	.realbits = 16,
	104	.storagebits = 16,
	105	.endianness = IIO_BE,
	106	},
4839367d MR	107	},
	108	{
	109	.type = IIO_HUMIDITYRELATIVE,
	110	.address = HDC100X_REG_HUMIDITY,
	111	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	112	BIT(IIO_CHAN_INFO_SCALE) \|
16bf793f AS	113	BIT(IIO_CHAN_INFO_INT_TIME),
	114	.scan_index = 1,
	115	.scan_type = {
	116	.sign = 'u',
	117	.realbits = 16,
	118	.storagebits = 16,
	119	.endianness = IIO_BE,
	120	},
4839367d MR	121	},
	122	{
	123	.type = IIO_CURRENT,
	124	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	125	.extend_name = "heater",
	126	.output = 1,
16bf793f	127	.scan_index = -1,
4839367d	128	},
16bf793f	129	IIO_CHAN_SOFT_TIMESTAMP(2),
4839367d MR	130	};
4839367d MR	131
16bf793f AS	132	static const unsigned long hdc100x_scan_masks[] = {0x3, 0};
16bf793f AS	133
4839367d MR	134	static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
	135	{
	136	int tmp = (~mask & data->config) \| val;
	137	int ret;
	138
	139	ret = i2c_smbus_write_word_swapped(data->client,
	140	HDC100X_REG_CONFIG, tmp);
	141	if (!ret)
	142	data->config = tmp;
	143
	144	return ret;
	145	}
	146
	147	static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
	148	{
	149	int shift = hdc100x_resolution_shift[chan].shift;
	150	int ret = -EINVAL;
	151	int i;
	152
	153	for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
	154	if (val2 && val2 == hdc100x_int_time[chan][i]) {
	155	ret = hdc100x_update_config(data,
	156	hdc100x_resolution_shift[chan].mask << shift,
	157	i << shift);
	158	if (!ret)
	159	data->adc_int_us[chan] = val2;
	160	break;
	161	}
	162	}
	163
	164	return ret;
	165	}
	166
	167	static int hdc100x_get_measurement(struct hdc100x_data *data,
	168	struct iio_chan_spec const *chan)
	169	{
	170	struct i2c_client *client = data->client;
	171	int delay = data->adc_int_us[chan->address];
	172	int ret;
0d9dcf85	173	__be16 val;
4839367d MR	174
	175	/* start measurement */
	176	ret = i2c_smbus_write_byte(client, chan->address);
	177	if (ret < 0) {
	178	dev_err(&client->dev, "cannot start measurement");
	179	return ret;
	180	}
	181
	182	/* wait for integration time to pass */
	183	usleep_range(delay, delay + 1000);
	184
0d9dcf85 AS	185	/* read measurement */
0d9dcf85 AS	186	ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));
4839367d	187	if (ret < 0) {
0d9dcf85	188	dev_err(&client->dev, "cannot read sensor data\n");
4839367d MR	189	return ret;
4839367d MR	190	}
0d9dcf85	191	return be16_to_cpu(val);
4839367d MR	192	}
	193
	194	static int hdc100x_get_heater_status(struct hdc100x_data *data)
	195	{
	196	return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
	197	}
	198
	199	static int hdc100x_read_raw(struct iio_dev *indio_dev,
	200	struct iio_chan_spec const chan, int val,
	201	int *val2, long mask)
	202	{
	203	struct hdc100x_data *data = iio_priv(indio_dev);
	204
	205	switch (mask) {
	206	case IIO_CHAN_INFO_RAW: {
	207	int ret;
	208
	209	mutex_lock(&data->lock);
	210	if (chan->type == IIO_CURRENT) {
	211	*val = hdc100x_get_heater_status(data);
	212	ret = IIO_VAL_INT;
	213	} else {
16bf793f AS	214	ret = iio_device_claim_direct_mode(indio_dev);
	215	if (ret) {
	216	mutex_unlock(&data->lock);
	217	return ret;
	218	}
	219
4839367d	220	ret = hdc100x_get_measurement(data, chan);
16bf793f	221	iio_device_release_direct_mode(indio_dev);
4839367d MR	222	if (ret >= 0) {
	223	*val = ret;
	224	ret = IIO_VAL_INT;
	225	}
	226	}
	227	mutex_unlock(&data->lock);
	228	return ret;
	229	}
	230	case IIO_CHAN_INFO_INT_TIME:
	231	*val = 0;
	232	*val2 = data->adc_int_us[chan->address];
	233	return IIO_VAL_INT_PLUS_MICRO;
	234	case IIO_CHAN_INFO_SCALE:
	235	if (chan->type == IIO_TEMP) {
09bc0dda	236	*val = 165000;
94bef000	237	*val2 = 65536;
4839367d MR	238	return IIO_VAL_FRACTIONAL;
4839367d MR	239	} else {
94bef000 MR	240	*val = 100;
	241	*val2 = 65536;
	242	return IIO_VAL_FRACTIONAL;
4839367d MR	243	}
	244	break;
	245	case IIO_CHAN_INFO_OFFSET:
94bef000 MR	246	*val = -15887;
94bef000 MR	247	*val2 = 515151;
d3a21ce0	248	return IIO_VAL_INT_PLUS_MICRO;
4839367d MR	249	default:
	250	return -EINVAL;
	251	}
	252	}
	253
	254	static int hdc100x_write_raw(struct iio_dev *indio_dev,
	255	struct iio_chan_spec const *chan,
	256	int val, int val2, long mask)
	257	{
	258	struct hdc100x_data *data = iio_priv(indio_dev);
	259	int ret = -EINVAL;
	260
	261	switch (mask) {
	262	case IIO_CHAN_INFO_INT_TIME:
	263	if (val != 0)
	264	return -EINVAL;
	265
	266	mutex_lock(&data->lock);
	267	ret = hdc100x_set_it_time(data, chan->address, val2);
	268	mutex_unlock(&data->lock);
	269	return ret;
	270	case IIO_CHAN_INFO_RAW:
	271	if (chan->type != IIO_CURRENT \|\| val2 != 0)
	272	return -EINVAL;
	273
	274	mutex_lock(&data->lock);
	275	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
	276	val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
	277	mutex_unlock(&data->lock);
	278	return ret;
	279	default:
	280	return -EINVAL;
	281	}
	282	}
	283
16bf793f AS	284	static int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
	285	{
	286	struct hdc100x_data *data = iio_priv(indio_dev);
	287	int ret;
	288
	289	/* Buffer is enabled. First set ACQ Mode, then attach poll func */
	290	mutex_lock(&data->lock);
	291	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
	292	HDC100X_REG_CONFIG_ACQ_MODE);
	293	mutex_unlock(&data->lock);
	294	if (ret)
	295	return ret;
	296
	297	return iio_triggered_buffer_postenable(indio_dev);
	298	}
	299
	300	static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
	301	{
	302	struct hdc100x_data *data = iio_priv(indio_dev);
	303	int ret;
	304
	305	/* First detach poll func, then reset ACQ mode. OK to disable buffer */
	306	ret = iio_triggered_buffer_predisable(indio_dev);
	307	if (ret)
	308	return ret;
	309
	310	mutex_lock(&data->lock);
	311	ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
	312	mutex_unlock(&data->lock);
	313
	314	return ret;
	315	}
	316
	317	static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = {
	318	.postenable = hdc100x_buffer_postenable,
	319	.predisable = hdc100x_buffer_predisable,
	320	};
	321
	322	static irqreturn_t hdc100x_trigger_handler(int irq, void *p)
	323	{
	324	struct iio_poll_func *pf = p;
	325	struct iio_dev *indio_dev = pf->indio_dev;
	326	struct hdc100x_data *data = iio_priv(indio_dev);
	327	struct i2c_client *client = data->client;
	328	int delay = data->adc_int_us[0] + data->adc_int_us[1];
	329	int ret;
	330	s16 buf[8]; /* 2x s16 + padding + 8 byte timestamp */
	331
	332	/* dual read starts at temp register */
	333	mutex_lock(&data->lock);
	334	ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP);
	335	if (ret < 0) {
	336	dev_err(&client->dev, "cannot start measurement\n");
	337	goto err;
	338	}
	339	usleep_range(delay, delay + 1000);
	340
	341	ret = i2c_master_recv(client, (u8 *)buf, 4);
	342	if (ret < 0) {
	343	dev_err(&client->dev, "cannot read sensor data\n");
	344	goto err;
	345	}
	346
	347	iio_push_to_buffers_with_timestamp(indio_dev, buf,
348	iio_get_time_ns(indio_dev));
349	err:
350	mutex_unlock(&data->lock);
351	iio_trigger_notify_done(indio_dev->trig);
352
353	return IRQ_HANDLED;
354	}
355
4839367d MR	356	static const struct iio_info hdc100x_info = {
	357	.read_raw = hdc100x_read_raw,
	358	.write_raw = hdc100x_write_raw,
	359	.attrs = &hdc100x_attribute_group,
4839367d MR	360	};
	361
	362	static int hdc100x_probe(struct i2c_client *client,
	363	const struct i2c_device_id *id)
	364	{
	365	struct iio_dev *indio_dev;
	366	struct hdc100x_data *data;
16bf793f	367	int ret;
4839367d	368
0d9dcf85 AS	369	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA \|
0d9dcf85 AS	370	I2C_FUNC_SMBUS_BYTE \| I2C_FUNC_I2C))
f8d9d3b4	371	return -EOPNOTSUPP;
4839367d MR	372
	373	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	374	if (!indio_dev)
	375	return -ENOMEM;
	376
	377	data = iio_priv(indio_dev);
	378	i2c_set_clientdata(client, indio_dev);
	379	data->client = client;
	380	mutex_init(&data->lock);
	381
	382	indio_dev->dev.parent = &client->dev;
	383	indio_dev->name = dev_name(&client->dev);
	384	indio_dev->modes = INDIO_DIRECT_MODE;
	385	indio_dev->info = &hdc100x_info;
	386
	387	indio_dev->channels = hdc100x_channels;
	388	indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
16bf793f	389	indio_dev->available_scan_masks = hdc100x_scan_masks;
4839367d MR	390
	391	/* be sure we are in a known state */
	392	hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
	393	hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
16bf793f AS	394	hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
	395
	396	ret = iio_triggered_buffer_setup(indio_dev, NULL,
	397	hdc100x_trigger_handler,
	398	&hdc_buffer_setup_ops);
	399	if (ret < 0) {
	400	dev_err(&client->dev, "iio triggered buffer setup failed\n");
	401	return ret;
	402	}
	403	ret = iio_device_register(indio_dev);
	404	if (ret < 0)
	405	iio_triggered_buffer_cleanup(indio_dev);
	406
	407	return ret;
	408	}
	409
	410	static int hdc100x_remove(struct i2c_client *client)
	411	{
	412	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	413
	414	iio_device_unregister(indio_dev);
	415	iio_triggered_buffer_cleanup(indio_dev);
4839367d	416
16bf793f	417	return 0;
4839367d MR	418	}
	419
	420	static const struct i2c_device_id hdc100x_id[] = {
	421	{ "hdc100x", 0 },
8f4c9575 MS	422	{ "hdc1000", 0 },
	423	{ "hdc1008", 0 },
	424	{ "hdc1010", 0 },
	425	{ "hdc1050", 0 },
	426	{ "hdc1080", 0 },
4839367d MR	427	{ }
	428	};
	429	MODULE_DEVICE_TABLE(i2c, hdc100x_id);
	430
a2d80de8 MS	431	static const struct of_device_id hdc100x_dt_ids[] = {
	432	{ .compatible = "ti,hdc1000" },
	433	{ .compatible = "ti,hdc1008" },
	434	{ .compatible = "ti,hdc1010" },
	435	{ .compatible = "ti,hdc1050" },
	436	{ .compatible = "ti,hdc1080" },
	437	{ }
	438	};
	439	MODULE_DEVICE_TABLE(of, hdc100x_dt_ids);
	440
4839367d MR	441	static struct i2c_driver hdc100x_driver = {
	442	.driver = {
	443	.name = "hdc100x",
a2d80de8	444	.of_match_table = of_match_ptr(hdc100x_dt_ids),
4839367d MR	445	},
4839367d MR	446	.probe = hdc100x_probe,
16bf793f	447	.remove = hdc100x_remove,
4839367d MR	448	.id_table = hdc100x_id,
	449	};
	450	module_i2c_driver(hdc100x_driver);
	451
	452	MODULE_AUTHOR("Matt Ranostay <mranostay@gmail.com>");
	453	MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
	454	MODULE_LICENSE("GPL");