iio: health: Add driver for the TI AFE4404 heart monitor (87aec56e) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-iio-health-afe440x

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		What: /sys/bus/iio/devices/iio:deviceX/tia_resistanceY
		/sys/bus/iio/devices/iio:deviceX/tia_capacitanceY
		Date: December 2015
		KernelVersion:
		Contact: Andrew F. Davis <afd@ti.com>
		Description:
		Get and set the resistance and the capacitance settings for the
		Transimpedance Amplifier. Y is 1 for Rf1 and Cf1, Y is 2 for
		Rf2 and Cf2 values.

		What: /sys/bus/iio/devices/iio:deviceX/tia_separate_en
		Date: December 2015
		KernelVersion:
		Contact: Andrew F. Davis <afd@ti.com>
		Description:
		Enable or disable separate settings for the TransImpedance
		Amplifier above, when disabled both values are set by the
		first channel.

		What: /sys/bus/iio/devices/iio:deviceX/in_intensity_ledY_raw
		/sys/bus/iio/devices/iio:deviceX/in_intensity_ledY_ambient_raw
		Date: December 2015
		KernelVersion:
		Contact: Andrew F. Davis <afd@ti.com>
		Description:
		Get measured values from the ADC for these stages. Y is the
		specific LED number. The values are expressed in 24-bit twos
		complement.

		What: /sys/bus/iio/devices/iio:deviceX/in_intensity_ledY-ledY_ambient_raw
		Date: December 2015
		KernelVersion:
		Contact: Andrew F. Davis <afd@ti.com>
		Description:
		Get differential values from the ADC for these stages. Y is the
		specific LED number. The values are expressed in 24-bit twos
		complement for the specified LEDs.

		What: /sys/bus/iio/devices/iio:deviceX/out_current_ledY_offset
		/sys/bus/iio/devices/iio:deviceX/out_current_ledY_ambient_offset
		Date: December 2015
		KernelVersion:
		Contact: Andrew F. Davis <afd@ti.com>
		Description:
		Get and set the offset cancellation DAC setting for these
		stages. The values are expressed in 5-bit sign-magnitude.

		What: /sys/bus/iio/devices/iio:deviceX/out_current_ledY_raw
		Date: December 2015
		KernelVersion:
		Contact: Andrew F. Davis <afd@ti.com>
		Description:
		Get and set the LED current for the specified LED. Y is the
		specific LED number.

drivers/iio/health/Kconfig

+18 −1

Original line number	Diff line number	Diff line
		@@ -3,7 +3,22 @@
		#
		# When adding new entries keep the list in alphabetical order

		menu "Health sensors"
		menu "Health Sensors"

		menu "Heart Rate Monitors"

		config AFE4404
		tristate "TI AFE4404 heart rate and pulse oximeter sensor"
		depends on I2C
		select REGMAP_I2C
		select IIO_BUFFER
		select IIO_TRIGGERED_BUFFER
		help
		Say yes to choose the Texas Instruments AFE4404
		heart rate monitor and low-cost pulse oximeter.

		To compile this driver as a module, choose M here: the
		module will be called afe4404.

		config MAX30100
		tristate "MAX30100 heart rate and pulse oximeter sensor"
		@@ -19,3 +34,5 @@ config MAX30100
		module will be called max30100.

		endmenu

		endmenu

drivers/iio/health/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -4,4 +4,5 @@

		# When adding new entries keep the list in alphabetical order

		obj-$(CONFIG_AFE4404) += afe4404.o
		obj-$(CONFIG_MAX30100) += max30100.o

drivers/iio/health/afe4404.c

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Original line number	Diff line number	Diff line
		/*
		* AFE4404 Heart Rate Monitors and Low-Cost Pulse Oximeters
		*
		* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
		* Andrew F. Davis <afd@ti.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* 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.
		*/

		#include <linux/device.h>
		#include <linux/err.h>
		#include <linux/interrupt.h>
		#include <linux/i2c.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/regmap.h>
		#include <linux/sysfs.h>
		#include <linux/regulator/consumer.h>

		#include <linux/iio/iio.h>
		#include <linux/iio/sysfs.h>
		#include <linux/iio/buffer.h>
		#include <linux/iio/trigger.h>
		#include <linux/iio/triggered_buffer.h>
		#include <linux/iio/trigger_consumer.h>

		#include "afe440x.h"

		#define AFE4404_DRIVER_NAME "afe4404"

		/* AFE4404 registers */
		#define AFE4404_TIA_GAIN_SEP 0x20
		#define AFE4404_TIA_GAIN 0x21
		#define AFE4404_PROG_TG_STC 0x34
		#define AFE4404_PROG_TG_ENDC 0x35
		#define AFE4404_LED3LEDSTC 0x36
		#define AFE4404_LED3LEDENDC 0x37
		#define AFE4404_CLKDIV_PRF 0x39
		#define AFE4404_OFFDAC 0x3a
		#define AFE4404_DEC 0x3d
		#define AFE4404_AVG_LED2_ALED2VAL 0x3f
		#define AFE4404_AVG_LED1_ALED1VAL 0x40

		/* AFE4404 GAIN register fields */
		#define AFE4404_TIA_GAIN_RES_MASK GENMASK(2, 0)
		#define AFE4404_TIA_GAIN_RES_SHIFT 0
		#define AFE4404_TIA_GAIN_CAP_MASK GENMASK(5, 3)
		#define AFE4404_TIA_GAIN_CAP_SHIFT 3

		/* AFE4404 LEDCNTRL register fields */
		#define AFE4404_LEDCNTRL_ILED1_MASK GENMASK(5, 0)
		#define AFE4404_LEDCNTRL_ILED1_SHIFT 0
		#define AFE4404_LEDCNTRL_ILED2_MASK GENMASK(11, 6)
		#define AFE4404_LEDCNTRL_ILED2_SHIFT 6
		#define AFE4404_LEDCNTRL_ILED3_MASK GENMASK(17, 12)
		#define AFE4404_LEDCNTRL_ILED3_SHIFT 12

		/* AFE4404 CONTROL2 register fields */
		#define AFE440X_CONTROL2_ILED_2X_MASK BIT(17)
		#define AFE440X_CONTROL2_ILED_2X_SHIFT 17

		/* AFE4404 CONTROL3 register fields */
		#define AFE440X_CONTROL3_OSC_ENABLE BIT(9)

		/* AFE4404 OFFDAC register current fields */
		#define AFE4404_OFFDAC_CURR_LED1_MASK GENMASK(9, 5)
		#define AFE4404_OFFDAC_CURR_LED1_SHIFT 5
		#define AFE4404_OFFDAC_CURR_LED2_MASK GENMASK(19, 15)
		#define AFE4404_OFFDAC_CURR_LED2_SHIFT 15
		#define AFE4404_OFFDAC_CURR_LED3_MASK GENMASK(4, 0)
		#define AFE4404_OFFDAC_CURR_LED3_SHIFT 0
		#define AFE4404_OFFDAC_CURR_ALED1_MASK GENMASK(14, 10)
		#define AFE4404_OFFDAC_CURR_ALED1_SHIFT 10
		#define AFE4404_OFFDAC_CURR_ALED2_MASK GENMASK(4, 0)
		#define AFE4404_OFFDAC_CURR_ALED2_SHIFT 0

		/* AFE4404 NULL fields */
		#define NULL_MASK 0
		#define NULL_SHIFT 0

		/* AFE4404 TIA_GAIN_CAP values */
		#define AFE4404_TIA_GAIN_CAP_5_P 0x0
		#define AFE4404_TIA_GAIN_CAP_2_5_P 0x1
		#define AFE4404_TIA_GAIN_CAP_10_P 0x2
		#define AFE4404_TIA_GAIN_CAP_7_5_P 0x3
		#define AFE4404_TIA_GAIN_CAP_20_P 0x4
		#define AFE4404_TIA_GAIN_CAP_17_5_P 0x5
		#define AFE4404_TIA_GAIN_CAP_25_P 0x6
		#define AFE4404_TIA_GAIN_CAP_22_5_P 0x7

		/* AFE4404 TIA_GAIN_RES values */
		#define AFE4404_TIA_GAIN_RES_500_K 0x0
		#define AFE4404_TIA_GAIN_RES_250_K 0x1
		#define AFE4404_TIA_GAIN_RES_100_K 0x2
		#define AFE4404_TIA_GAIN_RES_50_K 0x3
		#define AFE4404_TIA_GAIN_RES_25_K 0x4
		#define AFE4404_TIA_GAIN_RES_10_K 0x5
		#define AFE4404_TIA_GAIN_RES_1_M 0x6
		#define AFE4404_TIA_GAIN_RES_2_M 0x7

		/**
		* struct afe4404_data
		* @dev - Device structure
		* @regmap - Register map of the device
		* @regulator - Pointer to the regulator for the IC
		* @trig - IIO trigger for this device
		* @irq - ADC_RDY line interrupt number
		*/
		struct afe4404_data {
		struct device *dev;
		struct regmap *regmap;
		struct regulator *regulator;
		struct iio_trigger *trig;
		int irq;
		};

		enum afe4404_chan_id {
		LED1,
		ALED1,
		LED2,
		ALED2,
		LED3,
		LED1_ALED1,
		LED2_ALED2,
		ILED1,
		ILED2,
		ILED3,
		};

		static const struct afe440x_reg_info afe4404_reg_info[] = {
		[LED1] = AFE440X_REG_INFO(AFE440X_LED1VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_LED1),
		[ALED1] = AFE440X_REG_INFO(AFE440X_ALED1VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_ALED1),
		[LED2] = AFE440X_REG_INFO(AFE440X_LED2VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_LED2),
		[ALED2] = AFE440X_REG_INFO(AFE440X_ALED2VAL, AFE4404_OFFDAC, AFE4404_OFFDAC_CURR_ALED2),
		[LED3] = AFE440X_REG_INFO(AFE440X_ALED2VAL, 0, NULL),
		[LED1_ALED1] = AFE440X_REG_INFO(AFE440X_LED1_ALED1VAL, 0, NULL),
		[LED2_ALED2] = AFE440X_REG_INFO(AFE440X_LED2_ALED2VAL, 0, NULL),
		[ILED1] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED1),
		[ILED2] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED2),
		[ILED3] = AFE440X_REG_INFO(AFE440X_LEDCNTRL, 0, AFE4404_LEDCNTRL_ILED3),
		};

		static const struct iio_chan_spec afe4404_channels[] = {
		/* ADC values */
		AFE440X_INTENSITY_CHAN(LED1, "led1", BIT(IIO_CHAN_INFO_OFFSET)),
		AFE440X_INTENSITY_CHAN(ALED1, "led1_ambient", BIT(IIO_CHAN_INFO_OFFSET)),
		AFE440X_INTENSITY_CHAN(LED2, "led2", BIT(IIO_CHAN_INFO_OFFSET)),
		AFE440X_INTENSITY_CHAN(ALED2, "led2_ambient", BIT(IIO_CHAN_INFO_OFFSET)),
		AFE440X_INTENSITY_CHAN(LED3, "led3", BIT(IIO_CHAN_INFO_OFFSET)),
		AFE440X_INTENSITY_CHAN(LED1_ALED1, "led1-led1_ambient", 0),
		AFE440X_INTENSITY_CHAN(LED2_ALED2, "led2-led2_ambient", 0),
		/* LED current */
		AFE440X_CURRENT_CHAN(ILED1, "led1"),
		AFE440X_CURRENT_CHAN(ILED2, "led2"),
		AFE440X_CURRENT_CHAN(ILED3, "led3"),
		};

		static const struct afe440x_val_table afe4404_res_table[] = {
		{ .integer = 500000, .fract = 0 },
		{ .integer = 250000, .fract = 0 },
		{ .integer = 100000, .fract = 0 },
		{ .integer = 50000, .fract = 0 },
		{ .integer = 25000, .fract = 0 },
		{ .integer = 10000, .fract = 0 },
		{ .integer = 1000000, .fract = 0 },
		{ .integer = 2000000, .fract = 0 },
		};
		AFE440X_TABLE_ATTR(tia_resistance_available, afe4404_res_table);

		static const struct afe440x_val_table afe4404_cap_table[] = {
		{ .integer = 0, .fract = 5000 },
		{ .integer = 0, .fract = 2500 },
		{ .integer = 0, .fract = 10000 },
		{ .integer = 0, .fract = 7500 },
		{ .integer = 0, .fract = 20000 },
		{ .integer = 0, .fract = 17500 },
		{ .integer = 0, .fract = 25000 },
		{ .integer = 0, .fract = 22500 },
		};
		AFE440X_TABLE_ATTR(tia_capacitance_available, afe4404_cap_table);

		static ssize_t afe440x_show_register(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct iio_dev *indio_dev = dev_to_iio_dev(dev);
		struct afe4404_data *afe = iio_priv(indio_dev);
		struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
		unsigned int reg_val, type;
		int vals[2];
		int ret, val_len;

		ret = regmap_read(afe->regmap, afe440x_attr->reg, &reg_val);
		if (ret)
		return ret;

		reg_val &= afe440x_attr->mask;
		reg_val >>= afe440x_attr->shift;

		switch (afe440x_attr->type) {
		case SIMPLE:
		type = IIO_VAL_INT;
		val_len = 1;
		vals[0] = reg_val;
		break;
		case RESISTANCE:
		case CAPACITANCE:
		type = IIO_VAL_INT_PLUS_MICRO;
		val_len = 2;
		if (reg_val < afe440x_attr->table_size) {
		vals[0] = afe440x_attr->val_table[reg_val].integer;
		vals[1] = afe440x_attr->val_table[reg_val].fract;
		break;
		}
		return -EINVAL;
		default:
		return -EINVAL;
		}

		return iio_format_value(buf, type, val_len, vals);
		}

		static ssize_t afe440x_store_register(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
		{
		struct iio_dev *indio_dev = dev_to_iio_dev(dev);
		struct afe4404_data *afe = iio_priv(indio_dev);
		struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
		int val, integer, fract, ret;

		ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
		if (ret)
		return ret;

		switch (afe440x_attr->type) {
		case SIMPLE:
		val = integer;
		break;
		case RESISTANCE:
		case CAPACITANCE:
		for (val = 0; val < afe440x_attr->table_size; val++)
		if (afe440x_attr->val_table[val].integer == integer &&
		afe440x_attr->val_table[val].fract == fract)
		break;
		if (val == afe440x_attr->table_size)
		return -EINVAL;
		break;
		default:
		return -EINVAL;
		}

		ret = regmap_update_bits(afe->regmap, afe440x_attr->reg,
		afe440x_attr->mask,
		(val << afe440x_attr->shift));
		if (ret)
		return ret;

		return count;
		}

		static AFE440X_ATTR(tia_separate_en, AFE4404_TIA_GAIN_SEP, AFE440X_TIAGAIN_ENSEPGAIN, SIMPLE, NULL, 0);

		static AFE440X_ATTR(tia_resistance1, AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_RES, RESISTANCE, afe4404_res_table, ARRAY_SIZE(afe4404_res_table));
		static AFE440X_ATTR(tia_capacitance1, AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_CAP, CAPACITANCE, afe4404_cap_table, ARRAY_SIZE(afe4404_cap_table));

		static AFE440X_ATTR(tia_resistance2, AFE4404_TIA_GAIN_SEP, AFE4404_TIA_GAIN_RES, RESISTANCE, afe4404_res_table, ARRAY_SIZE(afe4404_res_table));
		static AFE440X_ATTR(tia_capacitance2, AFE4404_TIA_GAIN_SEP, AFE4404_TIA_GAIN_CAP, CAPACITANCE, afe4404_cap_table, ARRAY_SIZE(afe4404_cap_table));

		static struct attribute *afe440x_attributes[] = {
		&afe440x_attr_tia_separate_en.dev_attr.attr,
		&afe440x_attr_tia_resistance1.dev_attr.attr,
		&afe440x_attr_tia_capacitance1.dev_attr.attr,
		&afe440x_attr_tia_resistance2.dev_attr.attr,
		&afe440x_attr_tia_capacitance2.dev_attr.attr,
		&dev_attr_tia_resistance_available.attr,
		&dev_attr_tia_capacitance_available.attr,
		NULL
		};

		static const struct attribute_group afe440x_attribute_group = {
		.attrs = afe440x_attributes
		};

		static int afe4404_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct afe4404_data *afe = iio_priv(indio_dev);
		const struct afe440x_reg_info reg_info = afe4404_reg_info[chan->address];
		int ret;

		switch (chan->type) {
		case IIO_INTENSITY:
		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		ret = regmap_read(afe->regmap, reg_info.reg, val);
		if (ret)
		return ret;
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_OFFSET:
		ret = regmap_read(afe->regmap, reg_info.offreg,
		val);
		if (ret)
		return ret;
		*val &= reg_info.mask;
		*val >>= reg_info.shift;
		return IIO_VAL_INT;
		}
		break;
		case IIO_CURRENT:
		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		ret = regmap_read(afe->regmap, reg_info.reg, val);
		if (ret)
		return ret;
		*val &= reg_info.mask;
		*val >>= reg_info.shift;
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = 800000;
		return IIO_VAL_INT_PLUS_MICRO;
		}
		break;
		default:
		break;
		}

		return -EINVAL;
		}

		static int afe4404_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct afe4404_data *afe = iio_priv(indio_dev);
		const struct afe440x_reg_info reg_info = afe4404_reg_info[chan->address];

		switch (chan->type) {
		case IIO_INTENSITY:
		switch (mask) {
		case IIO_CHAN_INFO_OFFSET:
		return regmap_update_bits(afe->regmap,
		reg_info.offreg,
		reg_info.mask,
		(val << reg_info.shift));
		}
		break;
		case IIO_CURRENT:
		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		return regmap_update_bits(afe->regmap,
		reg_info.reg,
		reg_info.mask,
		(val << reg_info.shift));
		}
		break;
		default:
		break;
		}

		return -EINVAL;
		}

		static const struct iio_info afe4404_iio_info = {
		.attrs = &afe440x_attribute_group,
		.read_raw = afe4404_read_raw,
		.write_raw = afe4404_write_raw,
		.driver_module = THIS_MODULE,
		};

		static irqreturn_t afe4404_trigger_handler(int irq, void *private)
		{
		struct iio_poll_func *pf = private;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct afe4404_data *afe = iio_priv(indio_dev);
		int ret, bit, i = 0;
		s32 buffer[10];

		for_each_set_bit(bit, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		ret = regmap_read(afe->regmap, afe4404_reg_info[bit].reg,
		&buffer[i++]);
		if (ret)
		goto err;
		}

		iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
		err:
		iio_trigger_notify_done(indio_dev->trig);

		return IRQ_HANDLED;
		}

		static const struct iio_trigger_ops afe4404_trigger_ops = {
		.owner = THIS_MODULE,
		};

		/* Default timings from data-sheet */
		#define AFE4404_TIMING_PAIRS \
		{ AFE440X_PRPCOUNT, 39999 }, \
		{ AFE440X_LED2LEDSTC, 0 }, \
		{ AFE440X_LED2LEDENDC, 398 }, \
		{ AFE440X_LED2STC, 80 }, \
		{ AFE440X_LED2ENDC, 398 }, \
		{ AFE440X_ADCRSTSTCT0, 5600 }, \
		{ AFE440X_ADCRSTENDCT0, 5606 }, \
		{ AFE440X_LED2CONVST, 5607 }, \
		{ AFE440X_LED2CONVEND, 6066 }, \
		{ AFE4404_LED3LEDSTC, 400 }, \
		{ AFE4404_LED3LEDENDC, 798 }, \
		{ AFE440X_ALED2STC, 480 }, \
		{ AFE440X_ALED2ENDC, 798 }, \
		{ AFE440X_ADCRSTSTCT1, 6068 }, \
		{ AFE440X_ADCRSTENDCT1, 6074 }, \
		{ AFE440X_ALED2CONVST, 6075 }, \
		{ AFE440X_ALED2CONVEND, 6534 }, \
		{ AFE440X_LED1LEDSTC, 800 }, \
		{ AFE440X_LED1LEDENDC, 1198 }, \
		{ AFE440X_LED1STC, 880 }, \
		{ AFE440X_LED1ENDC, 1198 }, \
		{ AFE440X_ADCRSTSTCT2, 6536 }, \
		{ AFE440X_ADCRSTENDCT2, 6542 }, \
		{ AFE440X_LED1CONVST, 6543 }, \
		{ AFE440X_LED1CONVEND, 7003 }, \
		{ AFE440X_ALED1STC, 1280 }, \
		{ AFE440X_ALED1ENDC, 1598 }, \
		{ AFE440X_ADCRSTSTCT3, 7005 }, \
		{ AFE440X_ADCRSTENDCT3, 7011 }, \
		{ AFE440X_ALED1CONVST, 7012 }, \
		{ AFE440X_ALED1CONVEND, 7471 }, \
		{ AFE440X_PDNCYCLESTC, 7671 }, \
		{ AFE440X_PDNCYCLEENDC, 39199 }

		static const struct reg_sequence afe4404_reg_sequences[] = {
		AFE4404_TIMING_PAIRS,
		{ AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
		{ AFE4404_TIA_GAIN, AFE4404_TIA_GAIN_RES_50_K },
		{ AFE440X_LEDCNTRL, (0xf << AFE4404_LEDCNTRL_ILED1_SHIFT) \|
		(0x3 << AFE4404_LEDCNTRL_ILED2_SHIFT) \|
		(0x3 << AFE4404_LEDCNTRL_ILED3_SHIFT) },
		{ AFE440X_CONTROL2, AFE440X_CONTROL3_OSC_ENABLE },
		};

		static const struct regmap_range afe4404_yes_ranges[] = {
		regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
		regmap_reg_range(AFE4404_AVG_LED2_ALED2VAL, AFE4404_AVG_LED1_ALED1VAL),
		};

		static const struct regmap_access_table afe4404_volatile_table = {
		.yes_ranges = afe4404_yes_ranges,
		.n_yes_ranges = ARRAY_SIZE(afe4404_yes_ranges),
		};

		static const struct regmap_config afe4404_regmap_config = {
		.reg_bits = 8,
		.val_bits = 24,

		.max_register = AFE4404_AVG_LED1_ALED1VAL,
		.cache_type = REGCACHE_RBTREE,
		.volatile_table = &afe4404_volatile_table,
		};

		#ifdef CONFIG_OF
		static const struct of_device_id afe4404_of_match[] = {
		{ .compatible = "ti,afe4404", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, afe4404_of_match);
		#endif

		static int afe4404_suspend(struct device *dev)
		{
		struct iio_dev *indio_dev = dev_to_iio_dev(dev);
		struct afe4404_data *afe = iio_priv(indio_dev);
		int ret;

		ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
		AFE440X_CONTROL2_PDN_AFE,
		AFE440X_CONTROL2_PDN_AFE);
		if (ret)
		return ret;

		ret = regulator_disable(afe->regulator);
		if (ret) {
		dev_err(dev, "Unable to disable regulator\n");
		return ret;
		}

		return 0;
		}

		static int afe4404_resume(struct device *dev)
		{
		struct iio_dev *indio_dev = dev_to_iio_dev(dev);
		struct afe4404_data *afe = iio_priv(indio_dev);
		int ret;

		ret = regulator_enable(afe->regulator);
		if (ret) {
		dev_err(dev, "Unable to enable regulator\n");
		return ret;
		}

		ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
		AFE440X_CONTROL2_PDN_AFE, 0);
		if (ret)
		return ret;

		return 0;
		}

		static SIMPLE_DEV_PM_OPS(afe4404_pm_ops, afe4404_suspend, afe4404_resume);

		static int afe4404_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct iio_dev *indio_dev;
		struct afe4404_data *afe;
		int ret;

		indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*afe));
		if (!indio_dev)
		return -ENOMEM;

		afe = iio_priv(indio_dev);
		i2c_set_clientdata(client, indio_dev);

		afe->dev = &client->dev;
		afe->irq = client->irq;

		afe->regmap = devm_regmap_init_i2c(client, &afe4404_regmap_config);
		if (IS_ERR(afe->regmap)) {
		dev_err(afe->dev, "Unable to allocate register map\n");
		return PTR_ERR(afe->regmap);
		}

		afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
		if (IS_ERR(afe->regulator)) {
		dev_err(afe->dev, "Unable to get regulator\n");
		return PTR_ERR(afe->regulator);
		}
		ret = regulator_enable(afe->regulator);
		if (ret) {
		dev_err(afe->dev, "Unable to enable regulator\n");
		return ret;
		}

		ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
		AFE440X_CONTROL0_SW_RESET);
		if (ret) {
		dev_err(afe->dev, "Unable to reset device\n");
		goto disable_reg;
		}

		ret = regmap_multi_reg_write(afe->regmap, afe4404_reg_sequences,
		ARRAY_SIZE(afe4404_reg_sequences));
		if (ret) {
		dev_err(afe->dev, "Unable to set register defaults\n");
		goto disable_reg;
		}

		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->dev.parent = afe->dev;
		indio_dev->channels = afe4404_channels;
		indio_dev->num_channels = ARRAY_SIZE(afe4404_channels);
		indio_dev->name = AFE4404_DRIVER_NAME;
		indio_dev->info = &afe4404_iio_info;

		if (afe->irq > 0) {
		afe->trig = devm_iio_trigger_alloc(afe->dev,
		"%s-dev%d",
		indio_dev->name,
		indio_dev->id);
		if (!afe->trig) {
		dev_err(afe->dev, "Unable to allocate IIO trigger\n");
		ret = -ENOMEM;
		goto disable_reg;
		}

		iio_trigger_set_drvdata(afe->trig, indio_dev);

		afe->trig->ops = &afe4404_trigger_ops;
		afe->trig->dev.parent = afe->dev;

		ret = iio_trigger_register(afe->trig);
		if (ret) {
		dev_err(afe->dev, "Unable to register IIO trigger\n");
		goto disable_reg;
		}

		ret = devm_request_threaded_irq(afe->dev, afe->irq,
		iio_trigger_generic_data_rdy_poll,
		NULL, IRQF_ONESHOT,
		AFE4404_DRIVER_NAME,
		afe->trig);
		if (ret) {
		dev_err(afe->dev, "Unable to request IRQ\n");
		goto disable_reg;
		}
		}

		ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
		afe4404_trigger_handler, NULL);
		if (ret) {
		dev_err(afe->dev, "Unable to setup buffer\n");
		goto unregister_trigger;
		}

		ret = iio_device_register(indio_dev);
		if (ret) {
		dev_err(afe->dev, "Unable to register IIO device\n");
		goto unregister_triggered_buffer;
		}

		return 0;

		unregister_triggered_buffer:
		iio_triggered_buffer_cleanup(indio_dev);
		unregister_trigger:
		if (afe->irq > 0)
		iio_trigger_unregister(afe->trig);
		disable_reg:
		regulator_disable(afe->regulator);

		return ret;
		}

		static int afe4404_remove(struct i2c_client *client)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(client);
		struct afe4404_data *afe = iio_priv(indio_dev);
		int ret;

		iio_device_unregister(indio_dev);

		iio_triggered_buffer_cleanup(indio_dev);

		if (afe->irq > 0)
		iio_trigger_unregister(afe->trig);

		ret = regulator_disable(afe->regulator);
		if (ret) {
		dev_err(afe->dev, "Unable to disable regulator\n");
		return ret;
		}

		return 0;
		}

		static const struct i2c_device_id afe4404_ids[] = {
		{ "afe4404", 0 },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(i2c, afe4404_ids);

		static struct i2c_driver afe4404_i2c_driver = {
		.driver = {
		.name = AFE4404_DRIVER_NAME,
		.of_match_table = of_match_ptr(afe4404_of_match),
		.pm = &afe4404_pm_ops,
		},
		.probe = afe4404_probe,
		.remove = afe4404_remove,
		.id_table = afe4404_ids,
		};
		module_i2c_driver(afe4404_i2c_driver);

		MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
		MODULE_DESCRIPTION("TI AFE4404 Heart Rate and Pulse Oximeter");
		MODULE_LICENSE("GPL v2");

drivers/iio/health/afe440x.h

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