iio: health: max30102: Add MAX30105 support

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>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c
index 37ddbada940d686fa89a473703e1e71a6539056e..490dfbaf35ac25ddb52ab08edffa885980ab3918 100644 (file)
--- 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
  */
 
@@ -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, &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");
@@ -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");