Commit 95c72b78 authored by Jean-Baptiste Maneyrol's avatar Jean-Baptiste Maneyrol Committed by Jonathan Cameron
Browse files

iio: pressure: icp10100: add driver for InvenSense ICP-101xx 



InvenSense ICP-101xx sensors are a family of barometric pressure
and temperature sensor.

These devices are I2C only and use a specific protocol of
commands/responses. Data transfer is secured by using crc8.

Driver provides processed pressure and raw temperature data.

Signed-off-by: default avatarJean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 2ddc982a

drivers/iio/pressure/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -101,6 +101,17 @@ config HP03 
	  To compile this driver as a module, choose M here: the module

	  will be called hp03.



config ICP10100

	tristate "InvenSense ICP-101xx pressure and temperature sensor"

	depends on I2C

	select CRC8

	help

	  Say yes here to build support for InvenSense ICP-101xx barometric

	  pressure and temperature sensor.



	  To compile this driver as a module, choose M here: the module

	  will be called icp10100.



config MPL115

	tristate

drivers/iio/pressure/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_DPS310) += dps310.o 
obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o

obj-$(CONFIG_HID_SENSOR_PRESS)   += hid-sensor-press.o

obj-$(CONFIG_HP03) += hp03.o

obj-$(CONFIG_ICP10100) += icp10100.o

obj-$(CONFIG_MPL115) += mpl115.o

obj-$(CONFIG_MPL115_I2C) += mpl115_i2c.o

obj-$(CONFIG_MPL115_SPI) += mpl115_spi.o

drivers/iio/pressure/icp10100.c

0 → 100644
+658 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Copyright (C) 2020 InvenSense, Inc.

 *

 * Driver for InvenSense ICP-1010xx barometric pressure and temperature sensor.

 *

 * Datasheet:

 * http://www.invensense.com/wp-content/uploads/2018/01/DS-000186-ICP-101xx-v1.2.pdf

 */



#include <linux/device.h>

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/pm_runtime.h>

#include <linux/crc8.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/log2.h>

#include <linux/math64.h>

#include <linux/regulator/consumer.h>

#include <linux/iio/iio.h>



#define ICP10100_ID_REG_GET(_reg)	((_reg) & 0x003F)

#define ICP10100_ID_REG			0x08

#define ICP10100_RESPONSE_WORD_LENGTH	3

#define ICP10100_CRC8_WORD_LENGTH	2

#define ICP10100_CRC8_POLYNOMIAL	0x31

#define ICP10100_CRC8_INIT		0xFF



enum icp10100_mode {

	ICP10100_MODE_LP,	/* Low power mode: 1x sampling */

	ICP10100_MODE_N,	/* Normal mode: 2x sampling */

	ICP10100_MODE_LN,	/* Low noise mode: 4x sampling */

	ICP10100_MODE_ULN,	/* Ultra low noise mode: 8x sampling */

	ICP10100_MODE_NB,

};



struct icp10100_state {

	struct mutex lock;

	struct i2c_client *client;

	struct regulator *vdd;

	enum icp10100_mode mode;

	int16_t cal[4];

};



struct icp10100_command {

	__be16 cmd;

	unsigned long wait_us;

	unsigned long wait_max_us;

	size_t response_word_nb;

};



static const struct icp10100_command icp10100_cmd_soft_reset = {

	.cmd = cpu_to_be16(0x805D),

	.wait_us = 170,

	.wait_max_us = 200,

	.response_word_nb = 0,

};



static const struct icp10100_command icp10100_cmd_read_id = {

	.cmd = cpu_to_be16(0xEFC8),

	.wait_us = 0,

	.response_word_nb = 1,

};



static const struct icp10100_command icp10100_cmd_read_otp = {

	.cmd = cpu_to_be16(0xC7F7),

	.wait_us = 0,

	.response_word_nb = 1,

};



static const struct icp10100_command icp10100_cmd_measure[] = {

	[ICP10100_MODE_LP] = {

		.cmd = cpu_to_be16(0x401A),

		.wait_us = 1800,

		.wait_max_us = 2000,

		.response_word_nb = 3,

	},

	[ICP10100_MODE_N] = {

		.cmd = cpu_to_be16(0x48A3),

		.wait_us = 6300,

		.wait_max_us = 6500,

		.response_word_nb = 3,

	},

	[ICP10100_MODE_LN] = {

		.cmd = cpu_to_be16(0x5059),

		.wait_us = 23800,

		.wait_max_us = 24000,

		.response_word_nb = 3,

	},

	[ICP10100_MODE_ULN] = {

		.cmd = cpu_to_be16(0x58E0),

		.wait_us = 94500,

		.wait_max_us = 94700,

		.response_word_nb = 3,

	},

};



static const uint8_t icp10100_switch_mode_otp[] =

	{0xC5, 0x95, 0x00, 0x66, 0x9c};



DECLARE_CRC8_TABLE(icp10100_crc8_table);



static inline int icp10100_i2c_xfer(struct i2c_adapter *adap,

				    struct i2c_msg *msgs, int num)

{

	int ret;



	ret = i2c_transfer(adap, msgs, num);

	if (ret < 0)

		return ret;



	if (ret != num)

		return -EIO;



	return 0;

}



static int icp10100_send_cmd(struct icp10100_state *st,

			     const struct icp10100_command *cmd,

			     __be16 *buf, size_t buf_len)

{

	size_t size = cmd->response_word_nb * ICP10100_RESPONSE_WORD_LENGTH;

	uint8_t data[16];

	uint8_t *ptr;

	uint8_t *buf_ptr = (uint8_t *)buf;

	struct i2c_msg msgs[2] = {

		{

			.addr = st->client->addr,

			.flags = 0,

			.len = 2,

			.buf = (uint8_t *)&cmd->cmd,

		}, {

			.addr = st->client->addr,

			.flags = I2C_M_RD,

			.len = size,

			.buf = data,

		},

	};

	uint8_t crc;

	unsigned int i;

	int ret;



	if (size > sizeof(data))

		return -EINVAL;



	if (cmd->response_word_nb > 0 &&

			(buf == NULL || buf_len < (cmd->response_word_nb * 2)))

		return -EINVAL;



	dev_dbg(&st->client->dev, "sending cmd %#x\n", be16_to_cpu(cmd->cmd));



	if (cmd->response_word_nb > 0 && cmd->wait_us == 0) {

		/* direct command-response without waiting */

		ret = icp10100_i2c_xfer(st->client->adapter, msgs,

					ARRAY_SIZE(msgs));

		if (ret)

			return ret;

	} else {

		/* transfer command write */

		ret = icp10100_i2c_xfer(st->client->adapter, &msgs[0], 1);

		if (ret)

			return ret;

		if (cmd->wait_us > 0)

			usleep_range(cmd->wait_us, cmd->wait_max_us);

		/* transfer response read if needed */

		if (cmd->response_word_nb > 0) {

			ret = icp10100_i2c_xfer(st->client->adapter, &msgs[1], 1);

			if (ret)

				return ret;

		} else {

			return 0;

		}

	}



	/* process read words with crc checking */

	for (i = 0; i < cmd->response_word_nb; ++i) {

		ptr = &data[i * ICP10100_RESPONSE_WORD_LENGTH];

		crc = crc8(icp10100_crc8_table, ptr, ICP10100_CRC8_WORD_LENGTH,

			   ICP10100_CRC8_INIT);

		if (crc != ptr[ICP10100_CRC8_WORD_LENGTH]) {

			dev_err(&st->client->dev, "crc error recv=%#x calc=%#x\n",

				ptr[ICP10100_CRC8_WORD_LENGTH], crc);

			return -EIO;

		}

		*buf_ptr++ = ptr[0];

		*buf_ptr++ = ptr[1];

	}



	return 0;

}



static int icp10100_read_cal_otp(struct icp10100_state *st)

{

	__be16 val;

	int i;

	int ret;



	/* switch into OTP read mode */

	ret = i2c_master_send(st->client, icp10100_switch_mode_otp,

			      ARRAY_SIZE(icp10100_switch_mode_otp));

	if (ret < 0)

		return ret;

	if (ret != ARRAY_SIZE(icp10100_switch_mode_otp))

		return -EIO;



	/* read 4 calibration values */

	for (i = 0; i < 4; ++i) {

		ret = icp10100_send_cmd(st, &icp10100_cmd_read_otp,

					&val, sizeof(val));

		if (ret)

			return ret;

		st->cal[i] = be16_to_cpu(val);

		dev_dbg(&st->client->dev, "cal[%d] = %d\n", i, st->cal[i]);

	}



	return 0;

}



static int icp10100_init_chip(struct icp10100_state *st)

{

	__be16 val;

	uint16_t id;

	int ret;



	/* read and check id */

	ret = icp10100_send_cmd(st, &icp10100_cmd_read_id, &val, sizeof(val));

	if (ret)

		return ret;

	id = ICP10100_ID_REG_GET(be16_to_cpu(val));

	if (id != ICP10100_ID_REG) {

		dev_err(&st->client->dev, "invalid id %#x\n", id);

		return -ENODEV;

	}



	/* read calibration data from OTP */

	ret = icp10100_read_cal_otp(st);

	if (ret)

		return ret;



	/* reset chip */

	return icp10100_send_cmd(st, &icp10100_cmd_soft_reset, NULL, 0);

}



static int icp10100_get_measures(struct icp10100_state *st,

				uint32_t *pressure, uint16_t *temperature)

{

	const struct icp10100_command *cmd;

	__be16 measures[3];

	int ret;



	pm_runtime_get_sync(&st->client->dev);



	mutex_lock(&st->lock);

	cmd = &icp10100_cmd_measure[st->mode];

	ret = icp10100_send_cmd(st, cmd, measures, sizeof(measures));

	mutex_unlock(&st->lock);

	if (ret)

		goto error_measure;



	*pressure = (be16_to_cpu(measures[0]) << 8) |

			(be16_to_cpu(measures[1]) >> 8);

	*temperature = be16_to_cpu(measures[2]);



	pm_runtime_mark_last_busy(&st->client->dev);

error_measure:

	pm_runtime_put_autosuspend(&st->client->dev);

	return ret;

}



static uint32_t icp10100_get_pressure(struct icp10100_state *st,

				      uint32_t raw_pressure, uint16_t raw_temp)

{

	static int32_t p_calib[] = {45000, 80000, 105000};

	static int32_t lut_lower = 3670016;

	static int32_t lut_upper = 12058624;

	static int32_t inv_quadr_factor = 16777216;

	static int32_t offset_factor = 2048;

	int64_t val1, val2;

	int32_t p_lut[3];

	int32_t t, t_square;

	int64_t a, b, c;

	uint32_t pressure_mPa;



	dev_dbg(&st->client->dev, "raw: pressure = %u, temp = %u\n",

		raw_pressure, raw_temp);



	/* compute p_lut values */

	t = (int32_t)raw_temp - 32768;

	t_square = t * t;

	val1 = (int64_t)st->cal[0] * (int64_t)t_square;

	p_lut[0] = lut_lower + (int32_t)div_s64(val1, inv_quadr_factor);

	val1 = (int64_t)st->cal[1] * (int64_t)t_square;

	p_lut[1] = offset_factor * st->cal[3] +

			(int32_t)div_s64(val1, inv_quadr_factor);

	val1 = (int64_t)st->cal[2] * (int64_t)t_square;

	p_lut[2] = lut_upper + (int32_t)div_s64(val1, inv_quadr_factor);

	dev_dbg(&st->client->dev, "p_lut = [%d, %d, %d]\n",

		p_lut[0], p_lut[1], p_lut[2]);



	/* compute a, b, c factors */

	val1 = (int64_t)p_lut[0] * (int64_t)p_lut[1] *

			(int64_t)(p_calib[0] - p_calib[1]) +

		(int64_t)p_lut[1] * (int64_t)p_lut[2] *

			(int64_t)(p_calib[1] - p_calib[2]) +

		(int64_t)p_lut[2] * (int64_t)p_lut[0] *

			(int64_t)(p_calib[2] - p_calib[0]);

	val2 = (int64_t)p_lut[2] * (int64_t)(p_calib[0] - p_calib[1]) +

		(int64_t)p_lut[0] * (int64_t)(p_calib[1] - p_calib[2]) +

		(int64_t)p_lut[1] * (int64_t)(p_calib[2] - p_calib[0]);

	c = div64_s64(val1, val2);

	dev_dbg(&st->client->dev, "val1 = %lld, val2 = %lld, c = %lld\n",

		val1, val2, c);

	val1 = (int64_t)p_calib[0] * (int64_t)p_lut[0] -

		(int64_t)p_calib[1] * (int64_t)p_lut[1] -

		(int64_t)(p_calib[1] - p_calib[0]) * c;

	val2 = (int64_t)p_lut[0] - (int64_t)p_lut[1];

	a = div64_s64(val1, val2);

	dev_dbg(&st->client->dev, "val1 = %lld, val2 = %lld, a = %lld\n",

		val1, val2, a);

	b = ((int64_t)p_calib[0] - a) * ((int64_t)p_lut[0] + c);

	dev_dbg(&st->client->dev, "b = %lld\n", b);



	/*

	 * pressure_Pa = a + (b / (c + raw_pressure))

	 * pressure_mPa = 1000 * pressure_Pa

	 */

	pressure_mPa = 1000LL * a + div64_s64(1000LL * b, c + raw_pressure);



	return pressure_mPa;

}



static int icp10100_read_raw_measures(struct iio_dev *indio_dev,

				      struct iio_chan_spec const *chan,

				      int *val, int *val2)

{

	struct icp10100_state *st = iio_priv(indio_dev);

	uint32_t raw_pressure;

	uint16_t raw_temp;

	uint32_t pressure_mPa;

	int ret;



	ret = iio_device_claim_direct_mode(indio_dev);

	if (ret)

		return ret;



	ret = icp10100_get_measures(st, &raw_pressure, &raw_temp);

	if (ret)

		goto error_release;



	switch (chan->type) {

	case IIO_PRESSURE:

		pressure_mPa = icp10100_get_pressure(st, raw_pressure,

						     raw_temp);

		/* mPa to kPa */

		*val = pressure_mPa / 1000000;

		*val2 = pressure_mPa % 1000000;

		ret = IIO_VAL_INT_PLUS_MICRO;

		break;

	case IIO_TEMP:

		*val = raw_temp;

		ret = IIO_VAL_INT;

		break;

	default:

		ret = -EINVAL;

		break;

	};



error_release:

	iio_device_release_direct_mode(indio_dev);

	return ret;

}



static int icp10100_read_raw(struct iio_dev *indio_dev,

			     struct iio_chan_spec const *chan,

			     int *val, int *val2, long mask)

{

	struct icp10100_state *st = iio_priv(indio_dev);



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

	case IIO_CHAN_INFO_PROCESSED:

		return icp10100_read_raw_measures(indio_dev, chan, val, val2);

	case IIO_CHAN_INFO_SCALE:

		switch (chan->type) {

		case IIO_TEMP:

			/* 1000 * 175°C / 65536 in m°C */

			*val = 2;

			*val2 = 670288;

			return IIO_VAL_INT_PLUS_MICRO;

		default:

			return -EINVAL;

		}

		break;

	case IIO_CHAN_INFO_OFFSET:

		switch (chan->type) {

		case IIO_TEMP:

			/* 1000 * -45°C in m°C */

			*val = -45000;

			return IIO_VAL_INT;

		default:

			return -EINVAL;

		}

		break;

	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:

		mutex_lock(&st->lock);

		*val = 1 << st->mode;

		mutex_unlock(&st->lock);

		return IIO_VAL_INT;

	default:

		return -EINVAL;

	}

}



static int icp10100_read_avail(struct iio_dev *indio_dev,

			       struct iio_chan_spec const *chan,

			       const int **vals, int *type, int *length,

			       long mask)

{

	static int oversamplings[] = {1, 2, 4, 8};



	switch (mask) {

	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:

		*vals = oversamplings;

		*type = IIO_VAL_INT;

		*length = ARRAY_SIZE(oversamplings);

		return IIO_AVAIL_LIST;

	default:

		return -EINVAL;

	}

}



static int icp10100_write_raw(struct iio_dev *indio_dev,

			      struct iio_chan_spec const *chan,

			      int val, int val2, long mask)

{

	struct icp10100_state *st = iio_priv(indio_dev);

	unsigned int mode;

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:

		/* oversampling is always positive and a power of 2 */

		if (val <= 0 || !is_power_of_2(val))

			return -EINVAL;

		mode = ilog2(val);

		if (mode >= ICP10100_MODE_NB)

			return -EINVAL;

		ret = iio_device_claim_direct_mode(indio_dev);

		if (ret)

			return ret;

		mutex_lock(&st->lock);

		st->mode = mode;

		mutex_unlock(&st->lock);

		iio_device_release_direct_mode(indio_dev);

		return 0;

	default:

		return -EINVAL;

	}

}



static int icp10100_write_raw_get_fmt(struct iio_dev *indio_dev,

				      struct iio_chan_spec const *chan,

				      long mask)

{

	switch (mask) {

	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:

		return IIO_VAL_INT;

	default:

		return -EINVAL;

	}

}



static const struct iio_info icp10100_info = {

	.read_raw = icp10100_read_raw,

	.read_avail = icp10100_read_avail,

	.write_raw = icp10100_write_raw,

	.write_raw_get_fmt = icp10100_write_raw_get_fmt,

};



static const struct iio_chan_spec icp10100_channels[] = {

	{

		.type = IIO_PRESSURE,

		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),

		.info_mask_shared_by_all =

			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),

		.info_mask_shared_by_all_available =

			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),

	}, {

		.type = IIO_TEMP,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

			BIT(IIO_CHAN_INFO_SCALE) |

			BIT(IIO_CHAN_INFO_OFFSET),

		.info_mask_shared_by_all =

			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),

		.info_mask_shared_by_all_available =

			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),

	},

};



static int icp10100_enable_regulator(struct icp10100_state *st)

{

	int ret;



	ret = regulator_enable(st->vdd);

	if (ret)

		return ret;

	msleep(100);



	return 0;

}



static void icp10100_disable_regulator_action(void *data)

{

	struct icp10100_state *st = data;

	int ret;



	ret = regulator_disable(st->vdd);

	if (ret)

		dev_err(&st->client->dev, "error %d disabling vdd\n", ret);

}



static void icp10100_pm_disable(void *data)

{

	struct device *dev = data;



	pm_runtime_put_sync_suspend(dev);

	pm_runtime_disable(dev);

}



static int icp10100_probe(struct i2c_client *client,

			  const struct i2c_device_id *id)

{

	struct iio_dev *indio_dev;

	struct icp10100_state *st;

	int ret;



	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {

		dev_err(&client->dev, "plain i2c transactions not supported\n");

		return -ENODEV;

	}



	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));

	if (!indio_dev)

		return -ENOMEM;



	i2c_set_clientdata(client, indio_dev);

	indio_dev->dev.parent = &client->dev;

	indio_dev->name = client->name;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = icp10100_channels;

	indio_dev->num_channels = ARRAY_SIZE(icp10100_channels);

	indio_dev->info = &icp10100_info;



	st = iio_priv(indio_dev);

	mutex_init(&st->lock);

	st->client = client;

	st->mode = ICP10100_MODE_N;



	st->vdd = devm_regulator_get(&client->dev, "vdd");

	if (IS_ERR(st->vdd))

		return PTR_ERR(st->vdd);



	ret = icp10100_enable_regulator(st);

	if (ret)

		return ret;



	ret = devm_add_action_or_reset(&client->dev,

				       icp10100_disable_regulator_action, st);

	if (ret)

		return ret;



	/* has to be done before the first i2c communication */

	crc8_populate_msb(icp10100_crc8_table, ICP10100_CRC8_POLYNOMIAL);



	ret = icp10100_init_chip(st);

	if (ret) {

		dev_err(&client->dev, "init chip error %d\n", ret);

		return ret;

	}



	/* enable runtime pm with autosuspend delay of 2s */

	pm_runtime_get_noresume(&client->dev);

	pm_runtime_set_active(&client->dev);

	pm_runtime_enable(&client->dev);

	pm_runtime_set_autosuspend_delay(&client->dev, 2000);

	pm_runtime_use_autosuspend(&client->dev);

	pm_runtime_put(&client->dev);

	ret = devm_add_action_or_reset(&client->dev, icp10100_pm_disable,

				       &client->dev);

	if (ret)

		return ret;



	return devm_iio_device_register(&client->dev, indio_dev);

}



static int __maybe_unused icp10100_suspend(struct device *dev)

{

	struct icp10100_state *st = iio_priv(dev_get_drvdata(dev));

	int ret;



	mutex_lock(&st->lock);

	ret = regulator_disable(st->vdd);

	mutex_unlock(&st->lock);



	return ret;

}



static int __maybe_unused icp10100_resume(struct device *dev)

{

	struct icp10100_state *st = iio_priv(dev_get_drvdata(dev));

	int ret;



	mutex_lock(&st->lock);



	ret = icp10100_enable_regulator(st);

	if (ret)

		goto out_unlock;



	/* reset chip */

	ret = icp10100_send_cmd(st, &icp10100_cmd_soft_reset, NULL, 0);



out_unlock:

	mutex_unlock(&st->lock);

	return ret;

}



static UNIVERSAL_DEV_PM_OPS(icp10100_pm, icp10100_suspend, icp10100_resume,

			    NULL);



static const struct of_device_id icp10100_of_match[] = {

	{

		.compatible = "invensense,icp10100",

	},

	{ }

};

MODULE_DEVICE_TABLE(of, icp10100_of_match);



static const struct i2c_device_id icp10100_id[] = {

	{ "icp10100", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, icp10100_id);



static struct i2c_driver icp10100_driver = {

	.driver = {

		.name = "icp10100",

		.pm = &icp10100_pm,

		.of_match_table = of_match_ptr(icp10100_of_match),

	},

	.probe = icp10100_probe,

	.id_table = icp10100_id,

};

module_i2c_driver(icp10100_driver);



MODULE_AUTHOR("InvenSense, Inc.");

MODULE_DESCRIPTION("InvenSense icp10100 driver");

MODULE_LICENSE("GPL");

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