[linux.git] / drivers / iio / health / afe4403.c

/*
 * AFE4403 Heart Rate Monitors and Low-Cost Pulse Oximeters
 *
 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
 *	Andrew F. Davis <[email protected]>
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.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 AFE4403_DRIVER_NAME		"afe4403"

/* AFE4403 Registers */
#define AFE4403_TIAGAIN			0x20
#define AFE4403_TIA_AMB_GAIN		0x21

enum afe4403_fields {
	/* Gains */
	F_RF_LED1, F_CF_LED1,
	F_RF_LED, F_CF_LED,

	/* LED Current */
	F_ILED1, F_ILED2,

	/* sentinel */
	F_MAX_FIELDS
};

static const struct reg_field afe4403_reg_fields[] = {
	/* Gains */
	[F_RF_LED1]	= REG_FIELD(AFE4403_TIAGAIN, 0, 2),
	[F_CF_LED1]	= REG_FIELD(AFE4403_TIAGAIN, 3, 7),
	[F_RF_LED]	= REG_FIELD(AFE4403_TIA_AMB_GAIN, 0, 2),
	[F_CF_LED]	= REG_FIELD(AFE4403_TIA_AMB_GAIN, 3, 7),
	/* LED Current */
	[F_ILED1]	= REG_FIELD(AFE440X_LEDCNTRL, 0, 7),
	[F_ILED2]	= REG_FIELD(AFE440X_LEDCNTRL, 8, 15),
};

/**
 * struct afe4403_data - AFE4403 device instance data
 * @dev: Device structure
 * @spi: SPI device handle
 * @regmap: Register map of the device
 * @fields: Register fields of the device
 * @regulator: Pointer to the regulator for the IC
 * @trig: IIO trigger for this device
 * @irq: ADC_RDY line interrupt number
 */
struct afe4403_data {
	struct device *dev;
	struct spi_device *spi;
	struct regmap *regmap;
	struct regmap_field *fields[F_MAX_FIELDS];
	struct regulator *regulator;
	struct iio_trigger *trig;
	int irq;
};

enum afe4403_chan_id {
	LED2 = 1,
	ALED2,
	LED1,
	ALED1,
	LED2_ALED2,
	LED1_ALED1,
};

static const unsigned int afe4403_channel_values[] = {
	[LED2] = AFE440X_LED2VAL,
	[ALED2] = AFE440X_ALED2VAL,
	[LED1] = AFE440X_LED1VAL,
	[ALED1] = AFE440X_ALED1VAL,
	[LED2_ALED2] = AFE440X_LED2_ALED2VAL,
	[LED1_ALED1] = AFE440X_LED1_ALED1VAL,
};

static const unsigned int afe4403_channel_leds[] = {
	[LED2] = F_ILED2,
	[LED1] = F_ILED1,
};

static const struct iio_chan_spec afe4403_channels[] = {
	/* ADC values */
	AFE440X_INTENSITY_CHAN(LED2, 0),
	AFE440X_INTENSITY_CHAN(ALED2, 0),
	AFE440X_INTENSITY_CHAN(LED1, 0),
	AFE440X_INTENSITY_CHAN(ALED1, 0),
	AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
	AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
	/* LED current */
	AFE440X_CURRENT_CHAN(LED2),
	AFE440X_CURRENT_CHAN(LED1),
};

static const struct afe440x_val_table afe4403_res_table[] = {
	{ 500000 }, { 250000 }, { 100000 }, { 50000 },
	{ 25000 }, { 10000 }, { 1000000 }, { 0 },
};
AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4403_res_table);

static const struct afe440x_val_table afe4403_cap_table[] = {
	{ 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
	{ 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 },
	{ 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 },
	{ 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 },
	{ 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 },
	{ 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 },
	{ 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
	{ 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
};
AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4403_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 afe4403_data *afe = iio_priv(indio_dev);
	struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
	unsigned int reg_val;
	int vals[2];
	int ret;

	ret = regmap_field_read(afe->fields[afe440x_attr->field], &reg_val);
	if (ret)
		return ret;

	if (reg_val >= afe440x_attr->table_size)
		return -EINVAL;

	vals[0] = afe440x_attr->val_table[reg_val].integer;
	vals[1] = afe440x_attr->val_table[reg_val].fract;

	return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, 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 afe4403_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;

	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;

	ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
	if (ret)
		return ret;

	return count;
}

static AFE440X_ATTR(in_intensity1_resistance, F_RF_LED, afe4403_res_table);
static AFE440X_ATTR(in_intensity1_capacitance, F_CF_LED, afe4403_cap_table);

static AFE440X_ATTR(in_intensity2_resistance, F_RF_LED, afe4403_res_table);
static AFE440X_ATTR(in_intensity2_capacitance, F_CF_LED, afe4403_cap_table);

static AFE440X_ATTR(in_intensity3_resistance, F_RF_LED1, afe4403_res_table);
static AFE440X_ATTR(in_intensity3_capacitance, F_CF_LED1, afe4403_cap_table);

static AFE440X_ATTR(in_intensity4_resistance, F_RF_LED1, afe4403_res_table);
static AFE440X_ATTR(in_intensity4_capacitance, F_CF_LED1, afe4403_cap_table);

static struct attribute *afe440x_attributes[] = {
	&dev_attr_in_intensity_resistance_available.attr,
	&dev_attr_in_intensity_capacitance_available.attr,
	&afe440x_attr_in_intensity1_resistance.dev_attr.attr,
	&afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
	&afe440x_attr_in_intensity2_resistance.dev_attr.attr,
	&afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
	&afe440x_attr_in_intensity3_resistance.dev_attr.attr,
	&afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
	&afe440x_attr_in_intensity4_resistance.dev_attr.attr,
	&afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
	NULL
};

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

static int afe4403_read(struct afe4403_data *afe, unsigned int reg, u32 *val)
{
	u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
	u8 rx[3];
	int ret;

	/* Enable reading from the device */
	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	if (ret)
		return ret;

	ret = spi_write_then_read(afe->spi, &reg, 1, rx, 3);
	if (ret)
		return ret;

	*val = (rx[0] << 16) |
		(rx[1] << 8) |
		(rx[2]);

	/* Disable reading from the device */
	tx[3] = AFE440X_CONTROL0_WRITE;
	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	if (ret)
		return ret;

	return 0;
}

static int afe4403_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct afe4403_data *afe = iio_priv(indio_dev);
	unsigned int reg = afe4403_channel_values[chan->address];
	unsigned int field = afe4403_channel_leds[chan->address];
	int ret;

	switch (chan->type) {
	case IIO_INTENSITY:
		switch (mask) {
		case IIO_CHAN_INFO_RAW:
			ret = afe4403_read(afe, reg, val);
			if (ret)
				return ret;
			return IIO_VAL_INT;
		}
		break;
	case IIO_CURRENT:
		switch (mask) {
		case IIO_CHAN_INFO_RAW:
			ret = regmap_field_read(afe->fields[field], val);
			if (ret)
				return ret;
			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 afe4403_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct afe4403_data *afe = iio_priv(indio_dev);
	unsigned int field = afe4403_channel_leds[chan->address];

	switch (chan->type) {
	case IIO_CURRENT:
		switch (mask) {
		case IIO_CHAN_INFO_RAW:
			return regmap_field_write(afe->fields[field], val);
		}
		break;
	default:
		break;
	}

	return -EINVAL;
}

static const struct iio_info afe4403_iio_info = {
	.attrs = &afe440x_attribute_group,
	.read_raw = afe4403_read_raw,
	.write_raw = afe4403_write_raw,
};

static irqreturn_t afe4403_trigger_handler(int irq, void *private)
{
	struct iio_poll_func *pf = private;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct afe4403_data *afe = iio_priv(indio_dev);
	int ret, bit, i = 0;
	s32 buffer[8];
	u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
	u8 rx[3];

	/* Enable reading from the device */
	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	if (ret)
		goto err;

	for_each_set_bit(bit, indio_dev->active_scan_mask,
			 indio_dev->masklength) {
		ret = spi_write_then_read(afe->spi,
					  &afe4403_channel_values[bit], 1,
					  rx, 3);
		if (ret)
			goto err;

		buffer[i++] = (rx[0] << 16) |
				(rx[1] << 8) |
				(rx[2]);
	}

	/* Disable reading from the device */
	tx[3] = AFE440X_CONTROL0_WRITE;
	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	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 afe4403_trigger_ops = {
};

#define AFE4403_TIMING_PAIRS			\
	{ AFE440X_LED2STC,	0x000050 },	\
	{ AFE440X_LED2ENDC,	0x0003e7 },	\
	{ AFE440X_LED1LEDSTC,	0x0007d0 },	\
	{ AFE440X_LED1LEDENDC,	0x000bb7 },	\
	{ AFE440X_ALED2STC,	0x000438 },	\
	{ AFE440X_ALED2ENDC,	0x0007cf },	\
	{ AFE440X_LED1STC,	0x000820 },	\
	{ AFE440X_LED1ENDC,	0x000bb7 },	\
	{ AFE440X_LED2LEDSTC,	0x000000 },	\
	{ AFE440X_LED2LEDENDC,	0x0003e7 },	\
	{ AFE440X_ALED1STC,	0x000c08 },	\
	{ AFE440X_ALED1ENDC,	0x000f9f },	\
	{ AFE440X_LED2CONVST,	0x0003ef },	\
	{ AFE440X_LED2CONVEND,	0x0007cf },	\
	{ AFE440X_ALED2CONVST,	0x0007d7 },	\
	{ AFE440X_ALED2CONVEND,	0x000bb7 },	\
	{ AFE440X_LED1CONVST,	0x000bbf },	\
	{ AFE440X_LED1CONVEND,	0x009c3f },	\
	{ AFE440X_ALED1CONVST,	0x000fa7 },	\
	{ AFE440X_ALED1CONVEND,	0x001387 },	\
	{ AFE440X_ADCRSTSTCT0,	0x0003e8 },	\
	{ AFE440X_ADCRSTENDCT0,	0x0003eb },	\
	{ AFE440X_ADCRSTSTCT1,	0x0007d0 },	\
	{ AFE440X_ADCRSTENDCT1,	0x0007d3 },	\
	{ AFE440X_ADCRSTSTCT2,	0x000bb8 },	\
	{ AFE440X_ADCRSTENDCT2,	0x000bbb },	\
	{ AFE440X_ADCRSTSTCT3,	0x000fa0 },	\
	{ AFE440X_ADCRSTENDCT3,	0x000fa3 },	\
	{ AFE440X_PRPCOUNT,	0x009c3f },	\
	{ AFE440X_PDNCYCLESTC,	0x001518 },	\
	{ AFE440X_PDNCYCLEENDC,	0x00991f }

static const struct reg_sequence afe4403_reg_sequences[] = {
	AFE4403_TIMING_PAIRS,
	{ AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
	{ AFE4403_TIAGAIN, AFE440X_TIAGAIN_ENSEPGAIN },
};

static const struct regmap_range afe4403_yes_ranges[] = {
	regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
};

static const struct regmap_access_table afe4403_volatile_table = {
	.yes_ranges = afe4403_yes_ranges,
	.n_yes_ranges = ARRAY_SIZE(afe4403_yes_ranges),
};

static const struct regmap_config afe4403_regmap_config = {
	.reg_bits = 8,
	.val_bits = 24,

	.max_register = AFE440X_PDNCYCLEENDC,
	.cache_type = REGCACHE_RBTREE,
	.volatile_table = &afe4403_volatile_table,
};

static const struct of_device_id afe4403_of_match[] = {
	{ .compatible = "ti,afe4403", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, afe4403_of_match);

static int __maybe_unused afe4403_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
	struct afe4403_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 __maybe_unused afe4403_resume(struct device *dev)
{
	struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
	struct afe4403_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(afe4403_pm_ops, afe4403_suspend, afe4403_resume);

static int afe4403_probe(struct spi_device *spi)
{
	struct iio_dev *indio_dev;
	struct afe4403_data *afe;
	int i, ret;

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

	afe = iio_priv(indio_dev);
	spi_set_drvdata(spi, indio_dev);

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

	afe->regmap = devm_regmap_init_spi(spi, &afe4403_regmap_config);
	if (IS_ERR(afe->regmap)) {
		dev_err(afe->dev, "Unable to allocate register map\n");
		return PTR_ERR(afe->regmap);
	}

	for (i = 0; i < F_MAX_FIELDS; i++) {
		afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
							 afe4403_reg_fields[i]);
		if (IS_ERR(afe->fields[i])) {
			dev_err(afe->dev, "Unable to allocate regmap fields\n");
			return PTR_ERR(afe->fields[i]);
		}
	}

	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 err_disable_reg;
	}

	ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences,
				     ARRAY_SIZE(afe4403_reg_sequences));
	if (ret) {
		dev_err(afe->dev, "Unable to set register defaults\n");
		goto err_disable_reg;
	}

	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->dev.parent = afe->dev;
	indio_dev->channels = afe4403_channels;
	indio_dev->num_channels = ARRAY_SIZE(afe4403_channels);
	indio_dev->name = AFE4403_DRIVER_NAME;
	indio_dev->info = &afe4403_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 err_disable_reg;
		}

		iio_trigger_set_drvdata(afe->trig, indio_dev);

		afe->trig->ops = &afe4403_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 err_disable_reg;
		}

		ret = devm_request_threaded_irq(afe->dev, afe->irq,
						iio_trigger_generic_data_rdy_poll,
						NULL, IRQF_ONESHOT,
						AFE4403_DRIVER_NAME,
						afe->trig);
		if (ret) {
			dev_err(afe->dev, "Unable to request IRQ\n");
			goto err_trig;
		}
	}

	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
					 afe4403_trigger_handler, NULL);
	if (ret) {
		dev_err(afe->dev, "Unable to setup buffer\n");
		goto err_trig;
	}

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

	return 0;

err_buff:
	iio_triggered_buffer_cleanup(indio_dev);
err_trig:
	if (afe->irq > 0)
		iio_trigger_unregister(afe->trig);
err_disable_reg:
	regulator_disable(afe->regulator);

	return ret;
}

static int afe4403_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct afe4403_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 spi_device_id afe4403_ids[] = {
	{ "afe4403", 0 },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, afe4403_ids);

static struct spi_driver afe4403_spi_driver = {
	.driver = {
		.name = AFE4403_DRIVER_NAME,
		.of_match_table = afe4403_of_match,
		.pm = &afe4403_pm_ops,
	},
	.probe = afe4403_probe,
	.remove = afe4403_remove,
	.id_table = afe4403_ids,
};
module_spi_driver(afe4403_spi_driver);

MODULE_AUTHOR("Andrew F. Davis <[email protected]>");
MODULE_DESCRIPTION("TI AFE4403 Heart Rate Monitor and Pulse Oximeter AFE");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
eec96d1e AD	1	/*
	2	* AFE4403 Heart Rate Monitors and Low-Cost Pulse Oximeters
	3	*
f59e6b5a	4	* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
eec96d1e AD	5	* Andrew F. Davis <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*/
	16
	17	#include <linux/device.h>
	18	#include <linux/err.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
	22	#include <linux/regmap.h>
	23	#include <linux/spi/spi.h>
	24	#include <linux/sysfs.h>
	25	#include <linux/regulator/consumer.h>
	26
	27	#include <linux/iio/iio.h>
	28	#include <linux/iio/sysfs.h>
	29	#include <linux/iio/buffer.h>
	30	#include <linux/iio/trigger.h>
	31	#include <linux/iio/triggered_buffer.h>
	32	#include <linux/iio/trigger_consumer.h>
	33
	34	#include "afe440x.h"
	35
	36	#define AFE4403_DRIVER_NAME "afe4403"
	37
	38	/* AFE4403 Registers */
	39	#define AFE4403_TIAGAIN 0x20
	40	#define AFE4403_TIA_AMB_GAIN 0x21
	41
b36e8257 AD	42	enum afe4403_fields {
	43	/* Gains */
	44	F_RF_LED1, F_CF_LED1,
	45	F_RF_LED, F_CF_LED,
	46
	47	/* LED Current */
	48	F_ILED1, F_ILED2,
	49
	50	/* sentinel */
	51	F_MAX_FIELDS
	52	};
	53
	54	static const struct reg_field afe4403_reg_fields[] = {
	55	/* Gains */
	56	[F_RF_LED1] = REG_FIELD(AFE4403_TIAGAIN, 0, 2),
	57	[F_CF_LED1] = REG_FIELD(AFE4403_TIAGAIN, 3, 7),
	58	[F_RF_LED] = REG_FIELD(AFE4403_TIA_AMB_GAIN, 0, 2),
	59	[F_CF_LED] = REG_FIELD(AFE4403_TIA_AMB_GAIN, 3, 7),
	60	/* LED Current */
	61	[F_ILED1] = REG_FIELD(AFE440X_LEDCNTRL, 0, 7),
	62	[F_ILED2] = REG_FIELD(AFE440X_LEDCNTRL, 8, 15),
	63	};
	64
eec96d1e	65	/**
f59e6b5a AD	66	* struct afe4403_data - AFE4403 device instance data
	67	* @dev: Device structure
	68	* @spi: SPI device handle
	69	* @regmap: Register map of the device
b36e8257	70	* @fields: Register fields of the device
f59e6b5a AD	71	* @regulator: Pointer to the regulator for the IC
	72	* @trig: IIO trigger for this device
	73	* @irq: ADC_RDY line interrupt number
eec96d1e AD	74	*/
	75	struct afe4403_data {
	76	struct device *dev;
	77	struct spi_device *spi;
	78	struct regmap *regmap;
b36e8257	79	struct regmap_field *fields[F_MAX_FIELDS];
eec96d1e AD	80	struct regulator *regulator;
	81	struct iio_trigger *trig;
	82	int irq;
	83	};
	84
	85	enum afe4403_chan_id {
24b9dea7 AD	86	LED2 = 1,
24b9dea7 AD	87	ALED2,
eec96d1e AD	88	LED1,
eec96d1e AD	89	ALED1,
eec96d1e	90	LED2_ALED2,
24b9dea7	91	LED1_ALED1,
eec96d1e AD	92	};
eec96d1e AD	93
b36e8257 AD	94	static const unsigned int afe4403_channel_values[] = {
	95	[LED2] = AFE440X_LED2VAL,
	96	[ALED2] = AFE440X_ALED2VAL,
	97	[LED1] = AFE440X_LED1VAL,
	98	[ALED1] = AFE440X_ALED1VAL,
	99	[LED2_ALED2] = AFE440X_LED2_ALED2VAL,
	100	[LED1_ALED1] = AFE440X_LED1_ALED1VAL,
	101	};
	102
	103	static const unsigned int afe4403_channel_leds[] = {
3ff34ee2 AD	104	[LED2] = F_ILED2,
3ff34ee2 AD	105	[LED1] = F_ILED1,
eec96d1e AD	106	};
	107
	108	static const struct iio_chan_spec afe4403_channels[] = {
	109	/* ADC values */
24b9dea7 AD	110	AFE440X_INTENSITY_CHAN(LED2, 0),
	111	AFE440X_INTENSITY_CHAN(ALED2, 0),
	112	AFE440X_INTENSITY_CHAN(LED1, 0),
	113	AFE440X_INTENSITY_CHAN(ALED1, 0),
	114	AFE440X_INTENSITY_CHAN(LED2_ALED2, 0),
	115	AFE440X_INTENSITY_CHAN(LED1_ALED1, 0),
eec96d1e	116	/* LED current */
3ff34ee2 AD	117	AFE440X_CURRENT_CHAN(LED2),
3ff34ee2 AD	118	AFE440X_CURRENT_CHAN(LED1),
eec96d1e AD	119	};
	120
	121	static const struct afe440x_val_table afe4403_res_table[] = {
	122	{ 500000 }, { 250000 }, { 100000 }, { 50000 },
	123	{ 25000 }, { 10000 }, { 1000000 }, { 0 },
	124	};
1276187c	125	AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4403_res_table);
eec96d1e AD	126
	127	static const struct afe440x_val_table afe4403_cap_table[] = {
	128	{ 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
	129	{ 0, 30000 }, { 0, 35000 }, { 0, 45000 }, { 0, 50000 },
	130	{ 0, 55000 }, { 0, 60000 }, { 0, 70000 }, { 0, 75000 },
	131	{ 0, 80000 }, { 0, 85000 }, { 0, 95000 }, { 0, 100000 },
	132	{ 0, 155000 }, { 0, 160000 }, { 0, 170000 }, { 0, 175000 },
	133	{ 0, 180000 }, { 0, 185000 }, { 0, 195000 }, { 0, 200000 },
	134	{ 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
	135	{ 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
	136	};
1276187c	137	AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4403_cap_table);
eec96d1e AD	138
	139	static ssize_t afe440x_show_register(struct device *dev,
	140	struct device_attribute *attr,
	141	char *buf)
	142	{
	143	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	144	struct afe4403_data *afe = iio_priv(indio_dev);
	145	struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
81f51727	146	unsigned int reg_val;
eec96d1e	147	int vals[2];
81f51727	148	int ret;
eec96d1e	149
b36e8257	150	ret = regmap_field_read(afe->fields[afe440x_attr->field], &reg_val);
eec96d1e AD	151	if (ret)
	152	return ret;
	153
81f51727	154	if (reg_val >= afe440x_attr->table_size)
eec96d1e	155	return -EINVAL;
eec96d1e	156
81f51727 AD	157	vals[0] = afe440x_attr->val_table[reg_val].integer;
	158	vals[1] = afe440x_attr->val_table[reg_val].fract;
	159
	160	return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
eec96d1e AD	161	}
	162
	163	static ssize_t afe440x_store_register(struct device *dev,
	164	struct device_attribute *attr,
	165	const char *buf, size_t count)
	166	{
	167	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	168	struct afe4403_data *afe = iio_priv(indio_dev);
	169	struct afe440x_attr *afe440x_attr = to_afe440x_attr(attr);
	170	int val, integer, fract, ret;
	171
	172	ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
	173	if (ret)
	174	return ret;
	175
81f51727 AD	176	for (val = 0; val < afe440x_attr->table_size; val++)
	177	if (afe440x_attr->val_table[val].integer == integer &&
	178	afe440x_attr->val_table[val].fract == fract)
	179	break;
	180	if (val == afe440x_attr->table_size)
eec96d1e	181	return -EINVAL;
eec96d1e	182
b36e8257	183	ret = regmap_field_write(afe->fields[afe440x_attr->field], val);
eec96d1e AD	184	if (ret)
	185	return ret;
	186
	187	return count;
	188	}
	189
1276187c AD	190	static AFE440X_ATTR(in_intensity1_resistance, F_RF_LED, afe4403_res_table);
1276187c AD	191	static AFE440X_ATTR(in_intensity1_capacitance, F_CF_LED, afe4403_cap_table);
eec96d1e	192
1276187c AD	193	static AFE440X_ATTR(in_intensity2_resistance, F_RF_LED, afe4403_res_table);
	194	static AFE440X_ATTR(in_intensity2_capacitance, F_CF_LED, afe4403_cap_table);
	195
	196	static AFE440X_ATTR(in_intensity3_resistance, F_RF_LED1, afe4403_res_table);
	197	static AFE440X_ATTR(in_intensity3_capacitance, F_CF_LED1, afe4403_cap_table);
	198
	199	static AFE440X_ATTR(in_intensity4_resistance, F_RF_LED1, afe4403_res_table);
	200	static AFE440X_ATTR(in_intensity4_capacitance, F_CF_LED1, afe4403_cap_table);
eec96d1e AD	201
eec96d1e AD	202	static struct attribute *afe440x_attributes[] = {
1276187c AD	203	&dev_attr_in_intensity_resistance_available.attr,
	204	&dev_attr_in_intensity_capacitance_available.attr,
	205	&afe440x_attr_in_intensity1_resistance.dev_attr.attr,
	206	&afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
	207	&afe440x_attr_in_intensity2_resistance.dev_attr.attr,
	208	&afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
	209	&afe440x_attr_in_intensity3_resistance.dev_attr.attr,
	210	&afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
	211	&afe440x_attr_in_intensity4_resistance.dev_attr.attr,
	212	&afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
eec96d1e AD	213	NULL
	214	};
	215
	216	static const struct attribute_group afe440x_attribute_group = {
	217	.attrs = afe440x_attributes
	218	};
	219
	220	static int afe4403_read(struct afe4403_data afe, unsigned int reg, u32 val)
	221	{
	222	u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
	223	u8 rx[3];
	224	int ret;
	225
	226	/* Enable reading from the device */
	227	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	228	if (ret)
	229	return ret;
	230
	231	ret = spi_write_then_read(afe->spi, &reg, 1, rx, 3);
	232	if (ret)
	233	return ret;
	234
	235	*val = (rx[0] << 16) \|
	236	(rx[1] << 8) \|
	237	(rx[2]);
	238
	239	/* Disable reading from the device */
	240	tx[3] = AFE440X_CONTROL0_WRITE;
	241	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	242	if (ret)
	243	return ret;
	244
	245	return 0;
	246	}
	247
	248	static int afe4403_read_raw(struct iio_dev *indio_dev,
	249	struct iio_chan_spec const *chan,
	250	int val, int val2, long mask)
	251	{
	252	struct afe4403_data *afe = iio_priv(indio_dev);
b36e8257 AD	253	unsigned int reg = afe4403_channel_values[chan->address];
b36e8257 AD	254	unsigned int field = afe4403_channel_leds[chan->address];
eec96d1e AD	255	int ret;
	256
	257	switch (chan->type) {
	258	case IIO_INTENSITY:
	259	switch (mask) {
	260	case IIO_CHAN_INFO_RAW:
b36e8257	261	ret = afe4403_read(afe, reg, val);
eec96d1e AD	262	if (ret)
	263	return ret;
	264	return IIO_VAL_INT;
eec96d1e AD	265	}
	266	break;
	267	case IIO_CURRENT:
	268	switch (mask) {
	269	case IIO_CHAN_INFO_RAW:
b36e8257	270	ret = regmap_field_read(afe->fields[field], val);
eec96d1e AD	271	if (ret)
eec96d1e AD	272	return ret;
eec96d1e AD	273	return IIO_VAL_INT;
	274	case IIO_CHAN_INFO_SCALE:
	275	*val = 0;
	276	*val2 = 800000;
	277	return IIO_VAL_INT_PLUS_MICRO;
	278	}
	279	break;
	280	default:
	281	break;
	282	}
	283
	284	return -EINVAL;
	285	}
	286
	287	static int afe4403_write_raw(struct iio_dev *indio_dev,
	288	struct iio_chan_spec const *chan,
	289	int val, int val2, long mask)
	290	{
	291	struct afe4403_data *afe = iio_priv(indio_dev);
b36e8257	292	unsigned int field = afe4403_channel_leds[chan->address];
eec96d1e AD	293
eec96d1e AD	294	switch (chan->type) {
eec96d1e AD	295	case IIO_CURRENT:
	296	switch (mask) {
	297	case IIO_CHAN_INFO_RAW:
b36e8257	298	return regmap_field_write(afe->fields[field], val);
eec96d1e AD	299	}
	300	break;
	301	default:
	302	break;
	303	}
	304
	305	return -EINVAL;
	306	}
	307
	308	static const struct iio_info afe4403_iio_info = {
	309	.attrs = &afe440x_attribute_group,
	310	.read_raw = afe4403_read_raw,
	311	.write_raw = afe4403_write_raw,
eec96d1e AD	312	};
	313
	314	static irqreturn_t afe4403_trigger_handler(int irq, void *private)
	315	{
	316	struct iio_poll_func *pf = private;
	317	struct iio_dev *indio_dev = pf->indio_dev;
	318	struct afe4403_data *afe = iio_priv(indio_dev);
	319	int ret, bit, i = 0;
	320	s32 buffer[8];
	321	u8 tx[4] = {AFE440X_CONTROL0, 0x0, 0x0, AFE440X_CONTROL0_READ};
	322	u8 rx[3];
	323
	324	/* Enable reading from the device */
	325	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	326	if (ret)
	327	goto err;
	328
	329	for_each_set_bit(bit, indio_dev->active_scan_mask,
	330	indio_dev->masklength) {
	331	ret = spi_write_then_read(afe->spi,
b36e8257	332	&afe4403_channel_values[bit], 1,
eec96d1e AD	333	rx, 3);
	334	if (ret)
	335	goto err;
	336
	337	buffer[i++] = (rx[0] << 16) \|
	338	(rx[1] << 8) \|
	339	(rx[2]);
	340	}
	341
	342	/* Disable reading from the device */
	343	tx[3] = AFE440X_CONTROL0_WRITE;
	344	ret = spi_write_then_read(afe->spi, tx, 4, NULL, 0);
	345	if (ret)
	346	goto err;
	347
	348	iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
	349	err:
	350	iio_trigger_notify_done(indio_dev->trig);
	351
	352	return IRQ_HANDLED;
	353	}
	354
	355	static const struct iio_trigger_ops afe4403_trigger_ops = {
eec96d1e AD	356	};
	357
	358	#define AFE4403_TIMING_PAIRS \
	359	{ AFE440X_LED2STC, 0x000050 }, \
	360	{ AFE440X_LED2ENDC, 0x0003e7 }, \
	361	{ AFE440X_LED1LEDSTC, 0x0007d0 }, \
	362	{ AFE440X_LED1LEDENDC, 0x000bb7 }, \
	363	{ AFE440X_ALED2STC, 0x000438 }, \
	364	{ AFE440X_ALED2ENDC, 0x0007cf }, \
	365	{ AFE440X_LED1STC, 0x000820 }, \
	366	{ AFE440X_LED1ENDC, 0x000bb7 }, \
	367	{ AFE440X_LED2LEDSTC, 0x000000 }, \
	368	{ AFE440X_LED2LEDENDC, 0x0003e7 }, \
	369	{ AFE440X_ALED1STC, 0x000c08 }, \
	370	{ AFE440X_ALED1ENDC, 0x000f9f }, \
	371	{ AFE440X_LED2CONVST, 0x0003ef }, \
	372	{ AFE440X_LED2CONVEND, 0x0007cf }, \
	373	{ AFE440X_ALED2CONVST, 0x0007d7 }, \
	374	{ AFE440X_ALED2CONVEND, 0x000bb7 }, \
	375	{ AFE440X_LED1CONVST, 0x000bbf }, \
	376	{ AFE440X_LED1CONVEND, 0x009c3f }, \
	377	{ AFE440X_ALED1CONVST, 0x000fa7 }, \
	378	{ AFE440X_ALED1CONVEND, 0x001387 }, \
	379	{ AFE440X_ADCRSTSTCT0, 0x0003e8 }, \
	380	{ AFE440X_ADCRSTENDCT0, 0x0003eb }, \
	381	{ AFE440X_ADCRSTSTCT1, 0x0007d0 }, \
	382	{ AFE440X_ADCRSTENDCT1, 0x0007d3 }, \
	383	{ AFE440X_ADCRSTSTCT2, 0x000bb8 }, \
	384	{ AFE440X_ADCRSTENDCT2, 0x000bbb }, \
	385	{ AFE440X_ADCRSTSTCT3, 0x000fa0 }, \
	386	{ AFE440X_ADCRSTENDCT3, 0x000fa3 }, \
	387	{ AFE440X_PRPCOUNT, 0x009c3f }, \
	388	{ AFE440X_PDNCYCLESTC, 0x001518 }, \
	389	{ AFE440X_PDNCYCLEENDC, 0x00991f }
	390
	391	static const struct reg_sequence afe4403_reg_sequences[] = {
	392	AFE4403_TIMING_PAIRS,
e85fa033	393	{ AFE440X_CONTROL1, AFE440X_CONTROL1_TIMEREN },
81f51727	394	{ AFE4403_TIAGAIN, AFE440X_TIAGAIN_ENSEPGAIN },
eec96d1e AD	395	};
	396
	397	static const struct regmap_range afe4403_yes_ranges[] = {
	398	regmap_reg_range(AFE440X_LED2VAL, AFE440X_LED1_ALED1VAL),
	399	};
	400
	401	static const struct regmap_access_table afe4403_volatile_table = {
	402	.yes_ranges = afe4403_yes_ranges,
	403	.n_yes_ranges = ARRAY_SIZE(afe4403_yes_ranges),
	404	};
	405
	406	static const struct regmap_config afe4403_regmap_config = {
	407	.reg_bits = 8,
	408	.val_bits = 24,
	409
	410	.max_register = AFE440X_PDNCYCLEENDC,
	411	.cache_type = REGCACHE_RBTREE,
	412	.volatile_table = &afe4403_volatile_table,
	413	};
	414
eec96d1e AD	415	static const struct of_device_id afe4403_of_match[] = {
	416	{ .compatible = "ti,afe4403", },
	417	{ /* sentinel */ }
	418	};
	419	MODULE_DEVICE_TABLE(of, afe4403_of_match);
eec96d1e	420
9e8be75e	421	static int __maybe_unused afe4403_suspend(struct device *dev)
eec96d1e	422	{
a5badd1e	423	struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
eec96d1e AD	424	struct afe4403_data *afe = iio_priv(indio_dev);
	425	int ret;
	426
	427	ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
	428	AFE440X_CONTROL2_PDN_AFE,
	429	AFE440X_CONTROL2_PDN_AFE);
	430	if (ret)
	431	return ret;
	432
	433	ret = regulator_disable(afe->regulator);
	434	if (ret) {
	435	dev_err(dev, "Unable to disable regulator\n");
	436	return ret;
	437	}
	438
	439	return 0;
	440	}
	441
9e8be75e	442	static int __maybe_unused afe4403_resume(struct device *dev)
eec96d1e	443	{
a5badd1e	444	struct iio_dev *indio_dev = spi_get_drvdata(to_spi_device(dev));
eec96d1e AD	445	struct afe4403_data *afe = iio_priv(indio_dev);
	446	int ret;
	447
	448	ret = regulator_enable(afe->regulator);
	449	if (ret) {
	450	dev_err(dev, "Unable to enable regulator\n");
	451	return ret;
	452	}
	453
	454	ret = regmap_update_bits(afe->regmap, AFE440X_CONTROL2,
	455	AFE440X_CONTROL2_PDN_AFE, 0);
	456	if (ret)
	457	return ret;
	458
	459	return 0;
	460	}
	461
	462	static SIMPLE_DEV_PM_OPS(afe4403_pm_ops, afe4403_suspend, afe4403_resume);
	463
	464	static int afe4403_probe(struct spi_device *spi)
	465	{
	466	struct iio_dev *indio_dev;
	467	struct afe4403_data *afe;
b36e8257	468	int i, ret;
eec96d1e AD	469
	470	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*afe));
	471	if (!indio_dev)
	472	return -ENOMEM;
	473
	474	afe = iio_priv(indio_dev);
	475	spi_set_drvdata(spi, indio_dev);
	476
	477	afe->dev = &spi->dev;
	478	afe->spi = spi;
	479	afe->irq = spi->irq;
	480
	481	afe->regmap = devm_regmap_init_spi(spi, &afe4403_regmap_config);
	482	if (IS_ERR(afe->regmap)) {
	483	dev_err(afe->dev, "Unable to allocate register map\n");
	484	return PTR_ERR(afe->regmap);
	485	}
	486
b36e8257 AD	487	for (i = 0; i < F_MAX_FIELDS; i++) {
	488	afe->fields[i] = devm_regmap_field_alloc(afe->dev, afe->regmap,
	489	afe4403_reg_fields[i]);
	490	if (IS_ERR(afe->fields[i])) {
	491	dev_err(afe->dev, "Unable to allocate regmap fields\n");
	492	return PTR_ERR(afe->fields[i]);
	493	}
	494	}
	495
eec96d1e AD	496	afe->regulator = devm_regulator_get(afe->dev, "tx_sup");
	497	if (IS_ERR(afe->regulator)) {
	498	dev_err(afe->dev, "Unable to get regulator\n");
	499	return PTR_ERR(afe->regulator);
	500	}
	501	ret = regulator_enable(afe->regulator);
	502	if (ret) {
	503	dev_err(afe->dev, "Unable to enable regulator\n");
	504	return ret;
	505	}
	506
	507	ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
	508	AFE440X_CONTROL0_SW_RESET);
	509	if (ret) {
	510	dev_err(afe->dev, "Unable to reset device\n");
	511	goto err_disable_reg;
	512	}
	513
	514	ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences,
	515	ARRAY_SIZE(afe4403_reg_sequences));
	516	if (ret) {
	517	dev_err(afe->dev, "Unable to set register defaults\n");
	518	goto err_disable_reg;
	519	}
	520
	521	indio_dev->modes = INDIO_DIRECT_MODE;
	522	indio_dev->dev.parent = afe->dev;
	523	indio_dev->channels = afe4403_channels;
	524	indio_dev->num_channels = ARRAY_SIZE(afe4403_channels);
	525	indio_dev->name = AFE4403_DRIVER_NAME;
	526	indio_dev->info = &afe4403_iio_info;
	527
	528	if (afe->irq > 0) {
	529	afe->trig = devm_iio_trigger_alloc(afe->dev,
	530	"%s-dev%d",
	531	indio_dev->name,
	532	indio_dev->id);
	533	if (!afe->trig) {
	534	dev_err(afe->dev, "Unable to allocate IIO trigger\n");
	535	ret = -ENOMEM;
	536	goto err_disable_reg;
	537	}
	538
	539	iio_trigger_set_drvdata(afe->trig, indio_dev);
	540
	541	afe->trig->ops = &afe4403_trigger_ops;
	542	afe->trig->dev.parent = afe->dev;
	543
	544	ret = iio_trigger_register(afe->trig);
	545	if (ret) {
	546	dev_err(afe->dev, "Unable to register IIO trigger\n");
	547	goto err_disable_reg;
	548	}
	549
	550	ret = devm_request_threaded_irq(afe->dev, afe->irq,
	551	iio_trigger_generic_data_rdy_poll,
	552	NULL, IRQF_ONESHOT,
	553	AFE4403_DRIVER_NAME,
	554	afe->trig);
	555	if (ret) {
	556	dev_err(afe->dev, "Unable to request IRQ\n");
	557	goto err_trig;
	558	}
	559	}
560
561	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
562	afe4403_trigger_handler, NULL);
563	if (ret) {
564	dev_err(afe->dev, "Unable to setup buffer\n");
565	goto err_trig;
566	}
567
568	ret = iio_device_register(indio_dev);
569	if (ret) {
570	dev_err(afe->dev, "Unable to register IIO device\n");
571	goto err_buff;
572	}
573
574	return 0;
575
576	err_buff:
577	iio_triggered_buffer_cleanup(indio_dev);
578	err_trig:
579	if (afe->irq > 0)
580	iio_trigger_unregister(afe->trig);
581	err_disable_reg:
582	regulator_disable(afe->regulator);
583
584	return ret;
585	}
586
587	static int afe4403_remove(struct spi_device *spi)
588	{
589	struct iio_dev *indio_dev = spi_get_drvdata(spi);
590	struct afe4403_data *afe = iio_priv(indio_dev);
591	int ret;
592
593	iio_device_unregister(indio_dev);
594
595	iio_triggered_buffer_cleanup(indio_dev);
596
597	if (afe->irq > 0)
598	iio_trigger_unregister(afe->trig);
599
600	ret = regulator_disable(afe->regulator);
601	if (ret) {
602	dev_err(afe->dev, "Unable to disable regulator\n");
603	return ret;
604	}
605
606	return 0;
607	}
608
609	static const struct spi_device_id afe4403_ids[] = {
610	{ "afe4403", 0 },
611	{ /* sentinel */ }
612	};
613	MODULE_DEVICE_TABLE(spi, afe4403_ids);
614
615	static struct spi_driver afe4403_spi_driver = {
616	.driver = {
617	.name = AFE4403_DRIVER_NAME,
daffd7a7	618	.of_match_table = afe4403_of_match,
eec96d1e AD	619	.pm = &afe4403_pm_ops,
	620	},
	621	.probe = afe4403_probe,
	622	.remove = afe4403_remove,
	623	.id_table = afe4403_ids,
	624	};
	625	module_spi_driver(afe4403_spi_driver);
	626
	627	MODULE_AUTHOR("Andrew F. Davis <[email protected]>");
f59e6b5a	628	MODULE_DESCRIPTION("TI AFE4403 Heart Rate Monitor and Pulse Oximeter AFE");
eec96d1e	629	MODULE_LICENSE("GPL v2");