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linux/drivers/iio/health/max30102.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 
Based on 3 normalized pattern(s):

  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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] 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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

639 lines
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// 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.consulting>
*
* 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/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);
/* fall through */
case 2:
MAX30102_COPY_DATA(1);
/* fall through */
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;
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, &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 = 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");
/* 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
*/
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, &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 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");
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