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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,
- const struct i2c_device_id *id)
- {
- 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 = al3010_probe,
- .id_table = al3010_id,
- };
- module_i2c_driver(al3010_driver);
- MODULE_AUTHOR("Daniel Baluta <[email protected]>");
- MODULE_AUTHOR("David Heidelberg <[email protected]>");
- MODULE_DESCRIPTION("AL3010 Ambient Light Sensor driver");
- MODULE_LICENSE("GPL v2");
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