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// SPDX-License-Identifier: GPL-2.0-only
/*
* AL3010 - Dyna Image Ambient Light Sensor
*
* Copyright (c) 2014, Intel Corporation.
* Copyright (c) 2016, Dyna-Image Corp.
* Copyright (c) 2020, David Heidelberg, Michał Mirosław, Dmitry Osipenko
*
* IIO driver for AL3010 (7-bit I2C slave address 0x1C).
*
* TODO: interrupt support, thresholds
* When the driver will get support for interrupt handling, then interrupt
* will need to be disabled before turning sensor OFF in order to avoid
* potential races with the interrupt handling.
*/
#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define AL3010_DRV_NAME "al3010"
#define AL3010_REG_SYSTEM 0x00
#define AL3010_REG_DATA_LOW 0x0c
#define AL3010_REG_CONFIG 0x10
#define AL3010_CONFIG_DISABLE 0x00
#define AL3010_CONFIG_ENABLE 0x01
#define AL3010_GAIN_MASK GENMASK(6,4)
#define AL3010_SCALE_AVAILABLE "1.1872 0.2968 0.0742 0.018"
enum al3xxxx_range {
AL3XXX_RANGE_1, /* 77806 lx */
AL3XXX_RANGE_2, /* 19542 lx */
AL3XXX_RANGE_3, /* 4863 lx */
AL3XXX_RANGE_4 /* 1216 lx */
};
static const int al3010_scales[][2] = {
{0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
};
struct al3010_data {
struct i2c_client *client;
};
static const struct iio_chan_spec al3010_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
}
};
static IIO_CONST_ATTR(in_illuminance_scale_available, AL3010_SCALE_AVAILABLE);
static struct attribute *al3010_attributes[] = {
&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
NULL,
};
static const struct attribute_group al3010_attribute_group = {
.attrs = al3010_attributes,
};
static int al3010_set_pwr(struct i2c_client *client, bool pwr)
{
u8 val = pwr ? AL3010_CONFIG_ENABLE : AL3010_CONFIG_DISABLE;
return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM, val);
}
static void al3010_set_pwr_off(void *_data)
{
struct al3010_data *data = _data;
al3010_set_pwr(data->client, false);
}
static int al3010_init(struct al3010_data *data)
{
int ret;
ret = al3010_set_pwr(data->client, true);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_CONFIG,
FIELD_PREP(AL3010_GAIN_MASK,
AL3XXX_RANGE_3));
if (ret < 0)
return ret;
return 0;
}
static int al3010_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct al3010_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
/*
* ALS ADC value is stored in two adjacent registers:
* - low byte of output is stored at AL3010_REG_DATA_LOW
* - high byte of output is stored at AL3010_REG_DATA_LOW + 1
*/
ret = i2c_smbus_read_word_data(data->client,
AL3010_REG_DATA_LOW);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = i2c_smbus_read_byte_data(data->client,
AL3010_REG_CONFIG);
if (ret < 0)
return ret;
ret = FIELD_GET(AL3010_GAIN_MASK, ret);
*val = al3010_scales[ret][0];
*val2 = al3010_scales[ret][1];
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int al3010_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct al3010_data *data = iio_priv(indio_dev);
int i;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
for (i = 0; i < ARRAY_SIZE(al3010_scales); i++) {
if (val != al3010_scales[i][0] ||
val2 != al3010_scales[i][1])
continue;
return i2c_smbus_write_byte_data(data->client,
AL3010_REG_CONFIG,
FIELD_PREP(AL3010_GAIN_MASK, i));
}
break;
}
return -EINVAL;
}
static const struct iio_info al3010_info = {
.read_raw = al3010_read_raw,
.write_raw = al3010_write_raw,
.attrs = &al3010_attribute_group,
};
static int al3010_probe(struct i2c_client *client)
{
struct al3010_data *data;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
indio_dev->info = &al3010_info;
indio_dev->name = AL3010_DRV_NAME;
indio_dev->channels = al3010_channels;
indio_dev->num_channels = ARRAY_SIZE(al3010_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = al3010_init(data);
if (ret < 0) {
dev_err(&client->dev, "al3010 chip init failed\n");
return ret;
}
ret = devm_add_action_or_reset(&client->dev,
al3010_set_pwr_off,
data);
if (ret < 0)
return ret;
return devm_iio_device_register(&client->dev, indio_dev);
}
static int al3010_suspend(struct device *dev)
{
return al3010_set_pwr(to_i2c_client(dev), false);
}
static int al3010_resume(struct device *dev)
{
return al3010_set_pwr(to_i2c_client(dev), true);
}
static DEFINE_SIMPLE_DEV_PM_OPS(al3010_pm_ops, al3010_suspend, al3010_resume);
static const struct i2c_device_id al3010_id[] = {
{"al3010", },
{}
};
MODULE_DEVICE_TABLE(i2c, al3010_id);
static const struct of_device_id al3010_of_match[] = {
{ .compatible = "dynaimage,al3010", },
{},
};
MODULE_DEVICE_TABLE(of, al3010_of_match);
static struct i2c_driver al3010_driver = {
.driver = {
.name = AL3010_DRV_NAME,
.of_match_table = al3010_of_match,
.pm = pm_sleep_ptr(&al3010_pm_ops),
},
.probe_new = al3010_probe,
.id_table = al3010_id,
};
module_i2c_driver(al3010_driver);
MODULE_AUTHOR("Daniel Baluta <daniel.baluta@nxp.com>");
MODULE_AUTHOR("David Heidelberg <david@ixit.cz>");
MODULE_DESCRIPTION("AL3010 Ambient Light Sensor driver");
MODULE_LICENSE("GPL v2");