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path: root/drivers/iio/health/max30102.c
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Diffstat (limited to 'drivers/iio/health/max30102.c')
-rw-r--r--drivers/iio/health/max30102.c308
1 files changed, 234 insertions, 74 deletions
diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c
index 147a8c14235f..15ccadc74891 100644
--- a/drivers/iio/health/max30102.c
+++ b/drivers/iio/health/max30102.c
@@ -3,6 +3,9 @@
*
* Copyright (C) 2017 Matt Ranostay <matt@ranostay.consulting>
*
+ * Support for MAX30105 optical particle sensor
+ * Copyright (C) 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -13,6 +16,7 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
+ * 7-bit I2C chip address: 0x57
* TODO: proximity power saving feature
*/
@@ -32,6 +36,18 @@
#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)
@@ -52,7 +68,7 @@
#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_ENTRY_LEN 6
+#define MAX30102_REG_FIFO_DATA_BYTES 3
#define MAX30102_REG_FIFO_CONFIG 0x08
#define MAX30102_REG_FIFO_CONFIG_AVG_4SAMPLES BIT(1)
@@ -60,11 +76,18 @@
#define MAX30102_REG_FIFO_CONFIG_AFULL BIT(0)
#define MAX30102_REG_MODE_CONFIG 0x09
-#define MAX30102_REG_MODE_CONFIG_MODE_SPO2_EN BIT(0)
-#define MAX30102_REG_MODE_CONFIG_MODE_HR_EN BIT(1)
-#define MAX30102_REG_MODE_CONFIG_MODE_MASK 0x03
+#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
@@ -75,6 +98,7 @@
#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)
@@ -82,14 +106,18 @@
#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[8];
- __be32 processed_buffer[2]; /* 2 x 18-bit (padded to 32-bits) */
+ u8 buffer[12];
+ __be32 processed_buffer[3]; /* 3 x 18-bit (padded to 32-bits) */
};
static const struct regmap_config max30102_regmap_config = {
@@ -99,37 +127,47 @@ static const struct regmap_config max30102_regmap_config = {
.val_bits = 8,
};
-static const unsigned long max30102_scan_masks[] = {0x3, 0};
+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_INTENSITY,
- .channel2 = IIO_MOD_LIGHT_RED,
- .modified = 1,
-
- .scan_index = 0,
- .scan_type = {
- .sign = 'u',
- .shift = 8,
- .realbits = 18,
- .storagebits = 32,
- .endianness = IIO_BE,
- },
- },
- {
- .type = IIO_INTENSITY,
- .channel2 = IIO_MOD_LIGHT_IR,
- .modified = 1,
-
- .scan_index = 1,
- .scan_type = {
- .sign = 'u',
- .shift = 8,
- .realbits = 18,
- .storagebits = 32,
- .endianness = IIO_BE,
- },
+ .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 =
@@ -138,25 +176,69 @@ static const struct iio_chan_spec max30102_channels[] = {
},
};
-static int max30102_set_powermode(struct max30102_data *data, bool state)
+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,
- state ? 0 : 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;
- return max30102_set_powermode(data, true);
+ 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, false);
+ return max30102_set_powermode(data, MAX30102_REG_MODE_CONFIG_MODE_NONE,
+ false);
}
static const struct iio_buffer_setup_ops max30102_buffer_setup_ops = {
@@ -180,32 +262,51 @@ static inline int max30102_fifo_count(struct max30102_data *data)
return 0;
}
-static int max30102_read_measurement(struct max30102_data *data)
+#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,
- MAX30102_REG_FIFO_DATA_ENTRY_LEN,
+ measurements *
+ MAX30102_REG_FIFO_DATA_BYTES,
buffer);
- memcpy(&data->processed_buffer[0], &buffer[0], 3);
- memcpy(&data->processed_buffer[1], &buffer[3], 3);
+ switch (measurements) {
+ case 3:
+ MAX30102_COPY_DATA(2);
+ case 2: /* fall-through */
+ MAX30102_COPY_DATA(1);
+ case 1: /* fall-through */
+ MAX30102_COPY_DATA(0);
+ break;
+ default:
+ return -EINVAL;
+ }
- return (ret == MAX30102_REG_FIFO_DATA_ENTRY_LEN) ? 0 : -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);
+ ret = max30102_read_measurement(data, measurements);
if (ret)
break;
@@ -251,6 +352,29 @@ static int max30102_led_init(struct max30102_data *data)
if (ret)
return ret;
+ if (data->chip_id == max30105) {
+ ret = of_property_read_u32(np,
+ "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 = of_property_read_u32(np, "maxim,ir-led-current-microamp", &val);
if (ret) {
dev_info(dev, "no ir-led-current-microamp set\n");
@@ -261,7 +385,7 @@ static int max30102_led_init(struct max30102_data *data)
ret = max30102_get_current_idx(val, &reg);
if (ret) {
- dev_err(dev, "invalid IR LED current setting %d", val);
+ dev_err(dev, "invalid IR LED current setting %d\n", val);
return ret;
}
@@ -277,7 +401,7 @@ static int max30102_chip_init(struct max30102_data *data)
if (ret)
return ret;
- /* enable 18-bit HR + SPO2 readings at 400Hz */
+ /* 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) |
@@ -287,14 +411,6 @@ static int max30102_chip_init(struct max30102_data *data)
if (ret)
return ret;
- /* enable SPO2 mode */
- ret = regmap_update_bits(data->regmap, MAX30102_REG_MODE_CONFIG,
- MAX30102_REG_MODE_CONFIG_MODE_MASK,
- MAX30102_REG_MODE_CONFIG_MODE_HR_EN |
- MAX30102_REG_MODE_CONFIG_MODE_SPO2_EN);
- 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
@@ -329,20 +445,31 @@ static int max30102_read_temp(struct max30102_data *data, int *val)
return 0;
}
-static int max30102_get_temp(struct max30102_data *data, int *val)
+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)
- return ret;
+ goto out;
msleep(35);
+ ret = max30102_read_temp(data, val);
- return 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,
@@ -355,20 +482,19 @@ static int max30102_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
/*
- * Temperature reading can only be acquired while engine
- * is running
+ * Temperature reading can only be acquired when not in
+ * shutdown; leave shutdown briefly when buffer not running
*/
mutex_lock(&indio_dev->mlock);
-
if (!iio_buffer_enabled(indio_dev))
- ret = -EBUSY;
- else {
- ret = max30102_get_temp(data, val);
- if (!ret)
- ret = IIO_VAL_INT;
- }
-
+ ret = max30102_get_temp(data, val, true);
+ else
+ ret = max30102_get_temp(data, val, false);
mutex_unlock(&indio_dev->mlock);
+ if (ret)
+ return ret;
+
+ ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = 1000; /* 62.5 */
@@ -391,6 +517,7 @@ static int max30102_probe(struct i2c_client *client,
struct iio_buffer *buffer;
struct iio_dev *indio_dev;
int ret;
+ unsigned int reg;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
@@ -403,10 +530,7 @@ static int max30102_probe(struct i2c_client *client,
iio_device_attach_buffer(indio_dev, buffer);
indio_dev->name = MAX30102_DRV_NAME;
- indio_dev->channels = max30102_channels;
indio_dev->info = &max30102_info;
- indio_dev->num_channels = ARRAY_SIZE(max30102_channels);
- indio_dev->available_scan_masks = max30102_scan_masks;
indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
indio_dev->setup_ops = &max30102_buffer_setup_ops;
indio_dev->dev.parent = &client->dev;
@@ -414,16 +538,50 @@ static int max30102_probe(struct i2c_client *client,
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;
+ }
+
data->regmap = devm_regmap_init_i2c(client, &max30102_regmap_config);
if (IS_ERR(data->regmap)) {
- dev_err(&client->dev, "regmap initialization failed.\n");
+ dev_err(&client->dev, "regmap initialization failed\n");
return PTR_ERR(data->regmap);
}
- max30102_set_powermode(data, false);
+
+ /* 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)
@@ -452,19 +610,21 @@ static int max30102_remove(struct i2c_client *client)
struct max30102_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
- max30102_set_powermode(data, false);
+ max30102_set_power(data, false);
return 0;
}
static const struct i2c_device_id max30102_id[] = {
- { "max30102", 0 },
+ { "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);
@@ -481,5 +641,5 @@ static struct i2c_driver max30102_driver = {
module_i2c_driver(max30102_driver);
MODULE_AUTHOR("Matt Ranostay <matt@ranostay.consulting>");
-MODULE_DESCRIPTION("MAX30102 heart rate and pulse oximeter sensor");
+MODULE_DESCRIPTION("MAX30102 heart rate/pulse oximeter and MAX30105 particle sensor driver");
MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.