Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 642 insertions, 0 deletions

diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c
new file mode 100644
index 0000000000..37e619827e
--- /dev/null
+++ b/drivers/iio/health/max30102.c
@@ -0,0 +1,642 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * max30102.c - Support for MAX30102 heart rate and pulse oximeter sensor
+ *
+ * Copyright (C) 2017 Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Support for MAX30105 optical particle sensor
+ * Copyright (C) 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
+ *
+ * 7-bit I2C chip address: 0x57
+ * TODO: proximity power saving feature
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/kfifo_buf.h>
+
+#define MAX30102_REGMAP_NAME	"max30102_regmap"
+#define MAX30102_DRV_NAME	"max30102"
+#define MAX30102_PART_NUMBER	0x15
+
+enum max30102_chip_id {
+	max30102,
+	max30105,
+};
+
+enum max3012_led_idx {
+	MAX30102_LED_RED,
+	MAX30102_LED_IR,
+	MAX30105_LED_GREEN,
+};
+
+#define MAX30102_REG_INT_STATUS			0x00
+#define MAX30102_REG_INT_STATUS_PWR_RDY		BIT(0)
+#define MAX30102_REG_INT_STATUS_PROX_INT	BIT(4)
+#define MAX30102_REG_INT_STATUS_ALC_OVF		BIT(5)
+#define MAX30102_REG_INT_STATUS_PPG_RDY		BIT(6)
+#define MAX30102_REG_INT_STATUS_FIFO_RDY	BIT(7)
+
+#define MAX30102_REG_INT_ENABLE			0x02
+#define MAX30102_REG_INT_ENABLE_PROX_INT_EN	BIT(4)
+#define MAX30102_REG_INT_ENABLE_ALC_OVF_EN	BIT(5)
+#define MAX30102_REG_INT_ENABLE_PPG_EN		BIT(6)
+#define MAX30102_REG_INT_ENABLE_FIFO_EN		BIT(7)
+#define MAX30102_REG_INT_ENABLE_MASK		0xf0
+#define MAX30102_REG_INT_ENABLE_MASK_SHIFT	4
+
+#define MAX30102_REG_FIFO_WR_PTR		0x04
+#define MAX30102_REG_FIFO_OVR_CTR		0x05
+#define MAX30102_REG_FIFO_RD_PTR		0x06
+#define MAX30102_REG_FIFO_DATA			0x07
+#define MAX30102_REG_FIFO_DATA_BYTES		3
+
+#define MAX30102_REG_FIFO_CONFIG		0x08
+#define MAX30102_REG_FIFO_CONFIG_AVG_4SAMPLES	BIT(1)
+#define MAX30102_REG_FIFO_CONFIG_AVG_SHIFT	5
+#define MAX30102_REG_FIFO_CONFIG_AFULL		BIT(0)
+
+#define MAX30102_REG_MODE_CONFIG		0x09
+#define MAX30102_REG_MODE_CONFIG_MODE_NONE	0x00
+#define MAX30102_REG_MODE_CONFIG_MODE_HR	0x02 /* red LED */
+#define MAX30102_REG_MODE_CONFIG_MODE_HR_SPO2	0x03 /* red + IR LED */
+#define MAX30102_REG_MODE_CONFIG_MODE_MULTI	0x07 /* multi-LED mode */
+#define MAX30102_REG_MODE_CONFIG_MODE_MASK	GENMASK(2, 0)
+#define MAX30102_REG_MODE_CONFIG_PWR		BIT(7)
+
+#define MAX30102_REG_MODE_CONTROL_SLOT21	0x11 /* multi-LED control */
+#define MAX30102_REG_MODE_CONTROL_SLOT43	0x12
+#define MAX30102_REG_MODE_CONTROL_SLOT_MASK	(GENMASK(6, 4) | GENMASK(2, 0))
+#define MAX30102_REG_MODE_CONTROL_SLOT_SHIFT	4
+
+#define MAX30102_REG_SPO2_CONFIG		0x0a
+#define MAX30102_REG_SPO2_CONFIG_PULSE_411_US	0x03
+#define MAX30102_REG_SPO2_CONFIG_SR_400HZ	0x03
+#define MAX30102_REG_SPO2_CONFIG_SR_MASK	0x07
+#define MAX30102_REG_SPO2_CONFIG_SR_MASK_SHIFT	2
+#define MAX30102_REG_SPO2_CONFIG_ADC_4096_STEPS	BIT(0)
+#define MAX30102_REG_SPO2_CONFIG_ADC_MASK_SHIFT	5
+
+#define MAX30102_REG_RED_LED_CONFIG		0x0c
+#define MAX30102_REG_IR_LED_CONFIG		0x0d
+#define MAX30105_REG_GREEN_LED_CONFIG		0x0e
+
+#define MAX30102_REG_TEMP_CONFIG		0x21
+#define MAX30102_REG_TEMP_CONFIG_TEMP_EN	BIT(0)
+
+#define MAX30102_REG_TEMP_INTEGER		0x1f
+#define MAX30102_REG_TEMP_FRACTION		0x20
+
+#define MAX30102_REG_REV_ID			0xfe
+#define MAX30102_REG_PART_ID			0xff
+
+struct max30102_data {
+	struct i2c_client *client;
+	struct iio_dev *indio_dev;
+	struct mutex lock;
+	struct regmap *regmap;
+	enum max30102_chip_id chip_id;
+
+	u8 buffer[12];
+	__be32 processed_buffer[3]; /* 3 x 18-bit (padded to 32-bits) */
+};
+
+static const struct regmap_config max30102_regmap_config = {
+	.name = MAX30102_REGMAP_NAME,
+
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const unsigned long max30102_scan_masks[] = {
+	BIT(MAX30102_LED_RED) | BIT(MAX30102_LED_IR),
+	0
+};
+
+static const unsigned long max30105_scan_masks[] = {
+	BIT(MAX30102_LED_RED) | BIT(MAX30102_LED_IR),
+	BIT(MAX30102_LED_RED) | BIT(MAX30102_LED_IR) |
+		BIT(MAX30105_LED_GREEN),
+	0
+};
+
+#define MAX30102_INTENSITY_CHANNEL(_si, _mod) { \
+		.type = IIO_INTENSITY, \
+		.channel2 = _mod, \
+		.modified = 1, \
+		.scan_index = _si, \
+		.scan_type = { \
+			.sign = 'u', \
+			.shift = 8, \
+			.realbits = 18, \
+			.storagebits = 32, \
+			.endianness = IIO_BE, \
+		}, \
+	}
+
+static const struct iio_chan_spec max30102_channels[] = {
+	MAX30102_INTENSITY_CHANNEL(MAX30102_LED_RED, IIO_MOD_LIGHT_RED),
+	MAX30102_INTENSITY_CHANNEL(MAX30102_LED_IR, IIO_MOD_LIGHT_IR),
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+		.scan_index = -1,
+	},
+};
+
+static const struct iio_chan_spec max30105_channels[] = {
+	MAX30102_INTENSITY_CHANNEL(MAX30102_LED_RED, IIO_MOD_LIGHT_RED),
+	MAX30102_INTENSITY_CHANNEL(MAX30102_LED_IR, IIO_MOD_LIGHT_IR),
+	MAX30102_INTENSITY_CHANNEL(MAX30105_LED_GREEN, IIO_MOD_LIGHT_GREEN),
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+		.scan_index = -1,
+	},
+};
+
+static int max30102_set_power(struct max30102_data *data, bool en)
+{
+	return regmap_update_bits(data->regmap, MAX30102_REG_MODE_CONFIG,
+				  MAX30102_REG_MODE_CONFIG_PWR,
+				  en ? 0 : MAX30102_REG_MODE_CONFIG_PWR);
+}
+
+static int max30102_set_powermode(struct max30102_data *data, u8 mode, bool en)
+{
+	u8 reg = mode;
+
+	if (!en)
+		reg |= MAX30102_REG_MODE_CONFIG_PWR;
+
+	return regmap_update_bits(data->regmap, MAX30102_REG_MODE_CONFIG,
+				  MAX30102_REG_MODE_CONFIG_PWR |
+				  MAX30102_REG_MODE_CONFIG_MODE_MASK, reg);
+}
+
+#define MAX30102_MODE_CONTROL_LED_SLOTS(slot2, slot1) \
+	((slot2 << MAX30102_REG_MODE_CONTROL_SLOT_SHIFT) | slot1)
+
+static int max30102_buffer_postenable(struct iio_dev *indio_dev)
+{
+	struct max30102_data *data = iio_priv(indio_dev);
+	int ret;
+	u8 reg;
+
+	switch (*indio_dev->active_scan_mask) {
+	case BIT(MAX30102_LED_RED) | BIT(MAX30102_LED_IR):
+		reg = MAX30102_REG_MODE_CONFIG_MODE_HR_SPO2;
+		break;
+	case BIT(MAX30102_LED_RED) | BIT(MAX30102_LED_IR) |
+	     BIT(MAX30105_LED_GREEN):
+		ret = regmap_update_bits(data->regmap,
+					 MAX30102_REG_MODE_CONTROL_SLOT21,
+					 MAX30102_REG_MODE_CONTROL_SLOT_MASK,
+					 MAX30102_MODE_CONTROL_LED_SLOTS(2, 1));
+		if (ret)
+			return ret;
+
+		ret = regmap_update_bits(data->regmap,
+					 MAX30102_REG_MODE_CONTROL_SLOT43,
+					 MAX30102_REG_MODE_CONTROL_SLOT_MASK,
+					 MAX30102_MODE_CONTROL_LED_SLOTS(0, 3));
+		if (ret)
+			return ret;
+
+		reg = MAX30102_REG_MODE_CONFIG_MODE_MULTI;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return max30102_set_powermode(data, reg, true);
+}
+
+static int max30102_buffer_predisable(struct iio_dev *indio_dev)
+{
+	struct max30102_data *data = iio_priv(indio_dev);
+
+	return max30102_set_powermode(data, MAX30102_REG_MODE_CONFIG_MODE_NONE,
+				      false);
+}
+
+static const struct iio_buffer_setup_ops max30102_buffer_setup_ops = {
+	.postenable = max30102_buffer_postenable,
+	.predisable = max30102_buffer_predisable,
+};
+
+static inline int max30102_fifo_count(struct max30102_data *data)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(data->regmap, MAX30102_REG_INT_STATUS, &val);
+	if (ret)
+		return ret;
+
+	/* FIFO has one sample slot left */
+	if (val & MAX30102_REG_INT_STATUS_FIFO_RDY)
+		return 1;
+
+	return 0;
+}
+
+#define MAX30102_COPY_DATA(i) \
+	memcpy(&data->processed_buffer[(i)], \
+	       &buffer[(i) * MAX30102_REG_FIFO_DATA_BYTES], \
+	       MAX30102_REG_FIFO_DATA_BYTES)
+
+static int max30102_read_measurement(struct max30102_data *data,
+				     unsigned int measurements)
+{
+	int ret;
+	u8 *buffer = (u8 *) &data->buffer;
+
+	ret = i2c_smbus_read_i2c_block_data(data->client,
+					    MAX30102_REG_FIFO_DATA,
+					    measurements *
+					    MAX30102_REG_FIFO_DATA_BYTES,
+					    buffer);
+
+	switch (measurements) {
+	case 3:
+		MAX30102_COPY_DATA(2);
+		fallthrough;
+	case 2:
+		MAX30102_COPY_DATA(1);
+		fallthrough;
+	case 1:
+		MAX30102_COPY_DATA(0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return (ret == measurements * MAX30102_REG_FIFO_DATA_BYTES) ?
+	       0 : -EINVAL;
+}
+
+static irqreturn_t max30102_interrupt_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct max30102_data *data = iio_priv(indio_dev);
+	unsigned int measurements = bitmap_weight(indio_dev->active_scan_mask,
+						  indio_dev->masklength);
+	int ret, cnt = 0;
+
+	mutex_lock(&data->lock);
+
+	while (cnt || (cnt = max30102_fifo_count(data)) > 0) {
+		ret = max30102_read_measurement(data, measurements);
+		if (ret)
+			break;
+
+		iio_push_to_buffers(data->indio_dev, data->processed_buffer);
+		cnt--;
+	}
+
+	mutex_unlock(&data->lock);
+
+	return IRQ_HANDLED;
+}
+
+static int max30102_get_current_idx(unsigned int val, int *reg)
+{
+	/* each step is 0.200 mA */
+	*reg = val / 200;
+
+	return *reg > 0xff ? -EINVAL : 0;
+}
+
+static int max30102_led_init(struct max30102_data *data)
+{
+	struct device *dev = &data->client->dev;
+	unsigned int val;
+	int reg, ret;
+
+	ret = device_property_read_u32(dev, "maxim,red-led-current-microamp", &val);
+	if (ret) {
+		dev_info(dev, "no red-led-current-microamp set\n");
+
+		/* Default to 7 mA RED LED */
+		val = 7000;
+	}
+
+	ret = max30102_get_current_idx(val, &reg);
+	if (ret) {
+		dev_err(dev, "invalid RED LED current setting %d\n", val);
+		return ret;
+	}
+
+	ret = regmap_write(data->regmap, MAX30102_REG_RED_LED_CONFIG, reg);
+	if (ret)
+		return ret;
+
+	if (data->chip_id == max30105) {
+		ret = device_property_read_u32(dev,
+			"maxim,green-led-current-microamp", &val);
+		if (ret) {
+			dev_info(dev, "no green-led-current-microamp set\n");
+
+			/* Default to 7 mA green LED */
+			val = 7000;
+		}
+
+		ret = max30102_get_current_idx(val, &reg);
+		if (ret) {
+			dev_err(dev, "invalid green LED current setting %d\n",
+				val);
+			return ret;
+		}
+
+		ret = regmap_write(data->regmap, MAX30105_REG_GREEN_LED_CONFIG,
+				   reg);
+		if (ret)
+			return ret;
+	}
+
+	ret = device_property_read_u32(dev, "maxim,ir-led-current-microamp", &val);
+	if (ret) {
+		dev_info(dev, "no ir-led-current-microamp set\n");
+
+		/* Default to 7 mA IR LED */
+		val = 7000;
+	}
+
+	ret = max30102_get_current_idx(val, &reg);
+	if (ret) {
+		dev_err(dev, "invalid IR LED current setting %d\n", val);
+		return ret;
+	}
+
+	return regmap_write(data->regmap, MAX30102_REG_IR_LED_CONFIG, reg);
+}
+
+static int max30102_chip_init(struct max30102_data *data)
+{
+	int ret;
+
+	/* setup LED current settings */
+	ret = max30102_led_init(data);
+	if (ret)
+		return ret;
+
+	/* configure 18-bit HR + SpO2 readings at 400Hz */
+	ret = regmap_write(data->regmap, MAX30102_REG_SPO2_CONFIG,
+				(MAX30102_REG_SPO2_CONFIG_ADC_4096_STEPS
+				 << MAX30102_REG_SPO2_CONFIG_ADC_MASK_SHIFT) |
+				(MAX30102_REG_SPO2_CONFIG_SR_400HZ
+				 << MAX30102_REG_SPO2_CONFIG_SR_MASK_SHIFT) |
+				 MAX30102_REG_SPO2_CONFIG_PULSE_411_US);
+	if (ret)
+		return ret;
+
+	/* average 4 samples + generate FIFO interrupt */
+	ret = regmap_write(data->regmap, MAX30102_REG_FIFO_CONFIG,
+				(MAX30102_REG_FIFO_CONFIG_AVG_4SAMPLES
+				 << MAX30102_REG_FIFO_CONFIG_AVG_SHIFT) |
+				 MAX30102_REG_FIFO_CONFIG_AFULL);
+	if (ret)
+		return ret;
+
+	/* enable FIFO interrupt */
+	return regmap_update_bits(data->regmap, MAX30102_REG_INT_ENABLE,
+				 MAX30102_REG_INT_ENABLE_MASK,
+				 MAX30102_REG_INT_ENABLE_FIFO_EN);
+}
+
+static int max30102_read_temp(struct max30102_data *data, int *val)
+{
+	int ret;
+	unsigned int reg;
+
+	ret = regmap_read(data->regmap, MAX30102_REG_TEMP_INTEGER, &reg);
+	if (ret < 0)
+		return ret;
+	*val = reg << 4;
+
+	ret = regmap_read(data->regmap, MAX30102_REG_TEMP_FRACTION, &reg);
+	if (ret < 0)
+		return ret;
+
+	*val |= reg & 0xf;
+	*val = sign_extend32(*val, 11);
+
+	return 0;
+}
+
+static int max30102_get_temp(struct max30102_data *data, int *val, bool en)
+{
+	int ret;
+
+	if (en) {
+		ret = max30102_set_power(data, true);
+		if (ret)
+			return ret;
+	}
+
+	/* start acquisition */
+	ret = regmap_update_bits(data->regmap, MAX30102_REG_TEMP_CONFIG,
+				 MAX30102_REG_TEMP_CONFIG_TEMP_EN,
+				 MAX30102_REG_TEMP_CONFIG_TEMP_EN);
+	if (ret)
+		goto out;
+
+	msleep(35);
+	ret = max30102_read_temp(data, val);
+
+out:
+	if (en)
+		max30102_set_power(data, false);
+
+	return ret;
+}
+
+static int max30102_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val, int *val2, long mask)
+{
+	struct max30102_data *data = iio_priv(indio_dev);
+	int ret = -EINVAL;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		/*
+		 * Temperature reading can only be acquired when not in
+		 * shutdown; leave shutdown briefly when buffer not running
+		 */
+any_mode_retry:
+		if (iio_device_claim_buffer_mode(indio_dev)) {
+			/*
+			 * This one is a *bit* hacky. If we cannot claim buffer
+			 * mode, then try direct mode so that we make sure
+			 * things cannot concurrently change. And we just keep
+			 * trying until we get one of the modes...
+			 */
+			if (iio_device_claim_direct_mode(indio_dev))
+				goto any_mode_retry;
+
+			ret = max30102_get_temp(data, val, true);
+			iio_device_release_direct_mode(indio_dev);
+		} else {
+			ret = max30102_get_temp(data, val, false);
+			iio_device_release_buffer_mode(indio_dev);
+		}
+		if (ret)
+			return ret;
+
+		ret = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 1000;  /* 62.5 */
+		*val2 = 16;
+		ret = IIO_VAL_FRACTIONAL;
+		break;
+	}
+
+	return ret;
+}
+
+static const struct iio_info max30102_info = {
+	.read_raw = max30102_read_raw,
+};
+
+static int max30102_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(client);
+	struct max30102_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+	unsigned int reg;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	indio_dev->name = MAX30102_DRV_NAME;
+	indio_dev->info = &max30102_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	data = iio_priv(indio_dev);
+	data->indio_dev = indio_dev;
+	data->client = client;
+	data->chip_id = id->driver_data;
+
+	mutex_init(&data->lock);
+	i2c_set_clientdata(client, indio_dev);
+
+	switch (data->chip_id) {
+	case max30105:
+		indio_dev->channels = max30105_channels;
+		indio_dev->num_channels = ARRAY_SIZE(max30105_channels);
+		indio_dev->available_scan_masks = max30105_scan_masks;
+		break;
+	case max30102:
+		indio_dev->channels = max30102_channels;
+		indio_dev->num_channels = ARRAY_SIZE(max30102_channels);
+		indio_dev->available_scan_masks = max30102_scan_masks;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,
+					  &max30102_buffer_setup_ops);
+	if (ret)
+		return ret;
+
+	data->regmap = devm_regmap_init_i2c(client, &max30102_regmap_config);
+	if (IS_ERR(data->regmap)) {
+		dev_err(&client->dev, "regmap initialization failed\n");
+		return PTR_ERR(data->regmap);
+	}
+
+	/* check part ID */
+	ret = regmap_read(data->regmap, MAX30102_REG_PART_ID, &reg);
+	if (ret)
+		return ret;
+	if (reg != MAX30102_PART_NUMBER)
+		return -ENODEV;
+
+	/* show revision ID */
+	ret = regmap_read(data->regmap, MAX30102_REG_REV_ID, &reg);
+	if (ret)
+		return ret;
+	dev_dbg(&client->dev, "max3010x revision %02x\n", reg);
+
+	/* clear mode setting, chip shutdown */
+	ret = max30102_set_powermode(data, MAX30102_REG_MODE_CONFIG_MODE_NONE,
+				     false);
+	if (ret)
+		return ret;
+
+	ret = max30102_chip_init(data);
+	if (ret)
+		return ret;
+
+	if (client->irq <= 0) {
+		dev_err(&client->dev, "no valid irq defined\n");
+		return -EINVAL;
+	}
+
+	ret = devm_request_threaded_irq(&client->dev, client->irq,
+					NULL, max30102_interrupt_handler,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					"max30102_irq", indio_dev);
+	if (ret) {
+		dev_err(&client->dev, "request irq (%d) failed\n", client->irq);
+		return ret;
+	}
+
+	return iio_device_register(indio_dev);
+}
+
+static void max30102_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct max30102_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	max30102_set_power(data, false);
+}
+
+static const struct i2c_device_id max30102_id[] = {
+	{ "max30102", max30102 },
+	{ "max30105", max30105 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, max30102_id);
+
+static const struct of_device_id max30102_dt_ids[] = {
+	{ .compatible = "maxim,max30102" },
+	{ .compatible = "maxim,max30105" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max30102_dt_ids);
+
+static struct i2c_driver max30102_driver = {
+	.driver = {
+		.name	= MAX30102_DRV_NAME,
+		.of_match_table	= max30102_dt_ids,
+	},
+	.probe		= max30102_probe,
+	.remove		= max30102_remove,
+	.id_table	= max30102_id,
+};
+module_i2c_driver(max30102_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("MAX30102 heart rate/pulse oximeter and MAX30105 particle sensor driver");
+MODULE_LICENSE("GPL");