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iio: light: Add support for AL3000a illuminance sensor
AL3000a is a simple I2C-based ambient light sensor, which is closely related to AL3010 and AL3320a, but has significantly different way of processing data generated by the sensor. Tested-by: Robert Eckelmann <longnoserob@gmail.com> Tested-by: Antoni Aloy Torrens <aaloytorrens@gmail.com> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: David Heidelberg <david@ixit.cz> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20250217140336.107476-3-clamor95@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Svyatoslav Ryhel
Jonathan Cameron
parent
5f763d31a5
commit
d531b9f789
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@ -43,6 +43,16 @@ config ADUX1020
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To compile this driver as a module, choose M here: the
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module will be called adux1020.
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config AL3000A
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tristate "AL3000a ambient light sensor"
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depends on I2C
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help
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Say Y here if you want to build a driver for the Dyna Image AL3000a
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ambient light sensor.
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To compile this driver as a module, choose M here: the
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module will be called al3000a.
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config AL3010
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tristate "AL3010 ambient light sensor"
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depends on I2C
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@ -7,6 +7,7 @@
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obj-$(CONFIG_ACPI_ALS) += acpi-als.o
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obj-$(CONFIG_ADJD_S311) += adjd_s311.o
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obj-$(CONFIG_ADUX1020) += adux1020.o
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obj-$(CONFIG_AL3000A) += al3000a.o
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obj-$(CONFIG_AL3010) += al3010.o
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obj-$(CONFIG_AL3320A) += al3320a.o
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obj-$(CONFIG_APDS9160) += apds9160.o
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209
drivers/iio/light/al3000a.c
Normal file
209
drivers/iio/light/al3000a.c
Normal file
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@ -0,0 +1,209 @@
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// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/array_size.h>
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#include <linux/bitfield.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/types.h>
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#include <linux/iio/iio.h>
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#define AL3000A_REG_SYSTEM 0x00
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#define AL3000A_REG_DATA 0x05
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#define AL3000A_CONFIG_ENABLE 0x00
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#define AL3000A_CONFIG_DISABLE 0x0b
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#define AL3000A_CONFIG_RESET 0x0f
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#define AL3000A_GAIN_MASK GENMASK(5, 0)
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/*
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* These are pre-calculated lux values based on possible output of sensor
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* (range 0x00 - 0x3F)
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*/
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static const u32 lux_table[] = {
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1, 1, 1, 2, 2, 2, 3, 4, /* 0 - 7 */
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4, 5, 6, 7, 9, 11, 13, 16, /* 8 - 15 */
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19, 22, 27, 32, 39, 46, 56, 67, /* 16 - 23 */
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80, 96, 116, 139, 167, 200, 240, 289, /* 24 - 31 */
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347, 416, 499, 600, 720, 864, 1037, 1245, /* 32 - 39 */
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1495, 1795, 2155, 2587, 3105, 3728, 4475, 5373, /* 40 - 47 */
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6450, 7743, 9296, 11160, 13397, 16084, 19309, 23180, /* 48 - 55 */
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27828, 33408, 40107, 48148, 57803, 69393, 83306, 100000 /* 56 - 63 */
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};
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static const struct regmap_config al3000a_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = AL3000A_REG_DATA,
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};
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struct al3000a_data {
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struct regmap *regmap;
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struct regulator *vdd_supply;
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};
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static const struct iio_chan_spec al3000a_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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},
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};
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static int al3000a_set_pwr_on(struct al3000a_data *data)
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{
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struct device *dev = regmap_get_device(data->regmap);
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int ret;
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ret = regulator_enable(data->vdd_supply);
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if (ret) {
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dev_err(dev, "failed to enable vdd power supply\n");
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return ret;
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}
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return regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_ENABLE);
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}
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static void al3000a_set_pwr_off(void *_data)
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{
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struct al3000a_data *data = _data;
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struct device *dev = regmap_get_device(data->regmap);
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int ret;
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ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_DISABLE);
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if (ret)
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dev_err(dev, "failed to write system register\n");
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ret = regulator_disable(data->vdd_supply);
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if (ret)
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dev_err(dev, "failed to disable vdd power supply\n");
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}
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static int al3000a_init(struct al3000a_data *data)
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{
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int ret;
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ret = al3000a_set_pwr_on(data);
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if (ret)
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return ret;
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ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_RESET);
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if (ret)
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return ret;
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return regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_ENABLE);
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}
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static int al3000a_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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struct al3000a_data *data = iio_priv(indio_dev);
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int ret, gain;
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switch (mask) {
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case IIO_CHAN_INFO_PROCESSED:
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ret = regmap_read(data->regmap, AL3000A_REG_DATA, &gain);
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if (ret)
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return ret;
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*val = lux_table[gain & AL3000A_GAIN_MASK];
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info al3000a_info = {
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.read_raw = al3000a_read_raw,
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};
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static int al3000a_probe(struct i2c_client *client)
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{
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struct al3000a_data *data;
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struct device *dev = &client->dev;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->regmap = devm_regmap_init_i2c(client, &al3000a_regmap_config);
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if (IS_ERR(data->regmap))
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return dev_err_probe(dev, PTR_ERR(data->regmap),
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"cannot allocate regmap\n");
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data->vdd_supply = devm_regulator_get(dev, "vdd");
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if (IS_ERR(data->vdd_supply))
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return dev_err_probe(dev, PTR_ERR(data->vdd_supply),
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"failed to get vdd regulator\n");
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indio_dev->info = &al3000a_info;
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indio_dev->name = "al3000a";
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indio_dev->channels = al3000a_channels;
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indio_dev->num_channels = ARRAY_SIZE(al3000a_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = al3000a_init(data);
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if (ret)
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return dev_err_probe(dev, ret, "failed to init ALS\n");
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ret = devm_add_action_or_reset(dev, al3000a_set_pwr_off, data);
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if (ret)
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return dev_err_probe(dev, ret, "failed to add action\n");
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return devm_iio_device_register(dev, indio_dev);
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}
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static int al3000a_suspend(struct device *dev)
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{
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struct al3000a_data *data = iio_priv(dev_get_drvdata(dev));
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al3000a_set_pwr_off(data);
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return 0;
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}
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static int al3000a_resume(struct device *dev)
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{
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struct al3000a_data *data = iio_priv(dev_get_drvdata(dev));
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return al3000a_set_pwr_on(data);
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(al3000a_pm_ops, al3000a_suspend, al3000a_resume);
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static const struct i2c_device_id al3000a_id[] = {
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{ "al3000a" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, al3000a_id);
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static const struct of_device_id al3000a_of_match[] = {
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{ .compatible = "dynaimage,al3000a" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, al3000a_of_match);
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static struct i2c_driver al3000a_driver = {
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.driver = {
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.name = "al3000a",
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.of_match_table = al3000a_of_match,
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.pm = pm_sleep_ptr(&al3000a_pm_ops),
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},
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.probe = al3000a_probe,
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.id_table = al3000a_id,
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};
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module_i2c_driver(al3000a_driver);
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MODULE_AUTHOR("Svyatolsav Ryhel <clamor95@gmail.com>");
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MODULE_DESCRIPTION("al3000a Ambient Light Sensor driver");
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MODULE_LICENSE("GPL");
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