diff options
Diffstat (limited to 'drivers/iio/health/max30102.c')
| -rw-r--r-- | drivers/iio/health/max30102.c | 645 |
1 files changed, 645 insertions, 0 deletions
diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c new file mode 100644 index 000000000..15ccadc74 --- /dev/null +++ b/drivers/iio/health/max30102.c @@ -0,0 +1,645 @@ +/* + * max30102.c - Support for MAX30102 heart rate and pulse oximeter sensor + * + * 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 + * (at your option) any later version. + * + * 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. + * + * 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/of.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); + case 2: /* fall-through */ + MAX30102_COPY_DATA(1); + case 1: /* fall-through */ + 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; + struct device_node *np = dev->of_node; + unsigned int val; + int reg, ret; + + ret = of_property_read_u32(np, "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, ®); + 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 = 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"); + + /* Default to 7 mA IR LED */ + val = 7000; + } + + ret = max30102_get_current_idx(val, ®); + 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, ®); + if (ret < 0) + return ret; + *val = reg << 4; + + ret = regmap_read(data->regmap, MAX30102_REG_TEMP_FRACTION, ®); + 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 + */ + mutex_lock(&indio_dev->mlock); + if (!iio_buffer_enabled(indio_dev)) + 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 */ + *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) +{ + struct max30102_data *data; + 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) + return -ENOMEM; + + buffer = devm_iio_kfifo_allocate(&client->dev); + if (!buffer) + return -ENOMEM; + + iio_device_attach_buffer(indio_dev, buffer); + + indio_dev->name = MAX30102_DRV_NAME; + indio_dev->info = &max30102_info; + indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE); + indio_dev->setup_ops = &max30102_buffer_setup_ops; + indio_dev->dev.parent = &client->dev; + + 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"); + return PTR_ERR(data->regmap); + } + + /* check part ID */ + ret = regmap_read(data->regmap, MAX30102_REG_PART_ID, ®); + if (ret) + return ret; + if (reg != MAX30102_PART_NUMBER) + return -ENODEV; + + /* show revision ID */ + ret = regmap_read(data->regmap, MAX30102_REG_REV_ID, ®); + 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 int 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); + + return 0; +} + +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 = of_match_ptr(max30102_dt_ids), + }, + .probe = max30102_probe, + .remove = max30102_remove, + .id_table = max30102_id, +}; +module_i2c_driver(max30102_driver); + +MODULE_AUTHOR("Matt Ranostay <matt@ranostay.consulting>"); +MODULE_DESCRIPTION("MAX30102 heart rate/pulse oximeter and MAX30105 particle sensor driver"); +MODULE_LICENSE("GPL"); |