@@ -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
*/
@@ -34,9 +38,15 @@
#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
@@ -73,6 +83,11 @@ enum max3012_led_idx {
#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
@@ -83,6 +98,7 @@ enum max3012_led_idx {
#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)
@@ -98,9 +114,10 @@ struct max30102_data {
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 = {
@@ -115,6 +132,13 @@ static const unsigned long max30102_scan_masks[] = {
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, \
@@ -140,6 +164,18 @@ static const struct iio_chan_spec max30102_channels[] = {
},
};
+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,
@@ -159,12 +195,40 @@ static int max30102_set_powermode(struct max30102_data *data, u8 mode, bool en)
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;
- reg = MAX30102_REG_MODE_CONFIG_MODE_HR_SPO2;
+ 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);
}
@@ -203,32 +267,46 @@ static inline int max30102_fifo_count(struct max30102_data *data)
&buffer[(i) * MAX30102_REG_FIFO_DATA_BYTES], \
MAX30102_REG_FIFO_DATA_BYTES)
-static int max30102_read_measurement(struct max30102_data *data)
+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,
- 2 * MAX30102_REG_FIFO_DATA_BYTES,
+ measurements *
+ MAX30102_REG_FIFO_DATA_BYTES,
buffer);
- MAX30102_COPY_DATA(0);
- MAX30102_COPY_DATA(1);
+ 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 == 2 * MAX30102_REG_FIFO_DATA_BYTES) ? 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;
@@ -274,6 +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, ®);
+ 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");
@@ -429,10 +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;
@@ -440,10 +538,26 @@ 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");
@@ -502,13 +616,15 @@ static int max30102_remove(struct i2c_client *client)
}
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);
@@ -525,5 +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");
The Maxim MAX30105 part adds a third LED (green) and uses a multi-LED measuring mode producing three measurements Signed-off-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net> Cc: Matt Ranostay <matt@ranostay.consulting> --- drivers/iio/health/max30102.c | 144 ++++++++++++++++++++++++++++++++++++++---- 1 file changed, 130 insertions(+), 14 deletions(-)