iio: light: add Dyna-Image AL3010 driver
Based on: - 3320A in-kernel driver - https://www.spinics.net/lists/linux-iio/msg25145.html - https://lore.kernel.org/patchwork/patch/684179/ I decided to keep it aside of AL3320A due to different approach and much simpler design of 3010. Tested on Nexus 7 2012 (grouper/tilapia). Tested-by: David Heidelberg <david@ixit.cz> Tested-by: Dmitry Osipenko <digetx@gmail.com> Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: David Heidelberg <david@ixit.cz> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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David Heidelberg
Jonathan Cameron
parent
58d22a911d
commit
c36b5195ab
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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 AL3010
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tristate "AL3010 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 AL3010
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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 al3010.
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config AL3320A
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tristate "AL3320A 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_AL3010) += al3010.o
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obj-$(CONFIG_AL3320A) += al3320a.o
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obj-$(CONFIG_APDS9300) += apds9300.o
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obj-$(CONFIG_APDS9960) += apds9960.o
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@ -0,0 +1,242 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AL3010 - Dyna Image Ambient Light Sensor
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*
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* Copyright (c) 2014, Intel Corporation.
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* Copyright (c) 2016, Dyna-Image Corp.
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* Copyright (c) 2020, David Heidelberg, Michał Mirosław, Dmitry Osipenko
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*
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* IIO driver for AL3010 (7-bit I2C slave address 0x1C).
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*
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* TODO: interrupt support, thresholds
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* When the driver will get support for interrupt handling, then interrupt
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* will need to be disabled before turning sensor OFF in order to avoid
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* potential races with the interrupt handling.
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*/
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#include <linux/bitfield.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define AL3010_DRV_NAME "al3010"
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#define AL3010_REG_SYSTEM 0x00
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#define AL3010_REG_DATA_LOW 0x0c
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#define AL3010_REG_CONFIG 0x10
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#define AL3010_CONFIG_DISABLE 0x00
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#define AL3010_CONFIG_ENABLE 0x01
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#define AL3010_GAIN_MASK GENMASK(6,4)
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#define AL3010_SCALE_AVAILABLE "1.1872 0.2968 0.0742 0.018"
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enum al3xxxx_range {
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AL3XXX_RANGE_1, /* 77806 lx */
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AL3XXX_RANGE_2, /* 19542 lx */
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AL3XXX_RANGE_3, /* 4863 lx */
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AL3XXX_RANGE_4 /* 1216 lx */
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};
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static const int al3010_scales[][2] = {
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{0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
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};
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struct al3010_data {
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struct i2c_client *client;
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};
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static const struct iio_chan_spec al3010_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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}
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};
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static IIO_CONST_ATTR(in_illuminance_scale_available, AL3010_SCALE_AVAILABLE);
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static struct attribute *al3010_attributes[] = {
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&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group al3010_attribute_group = {
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.attrs = al3010_attributes,
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};
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static int al3010_set_pwr(struct i2c_client *client, bool pwr)
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{
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u8 val = pwr ? AL3010_CONFIG_ENABLE : AL3010_CONFIG_DISABLE;
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return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM, val);
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}
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static void al3010_set_pwr_off(void *_data)
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{
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struct al3010_data *data = _data;
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al3010_set_pwr(data->client, false);
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}
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static int al3010_init(struct al3010_data *data)
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{
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int ret;
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ret = al3010_set_pwr(data->client, true);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_CONFIG,
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FIELD_PREP(AL3010_GAIN_MASK,
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AL3XXX_RANGE_3));
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if (ret < 0)
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return ret;
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return 0;
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}
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static int al3010_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 al3010_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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/*
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* ALS ADC value is stored in two adjacent registers:
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* - low byte of output is stored at AL3010_REG_DATA_LOW
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* - high byte of output is stored at AL3010_REG_DATA_LOW + 1
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*/
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ret = i2c_smbus_read_word_data(data->client,
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AL3010_REG_DATA_LOW);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = i2c_smbus_read_byte_data(data->client,
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AL3010_REG_CONFIG);
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if (ret < 0)
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return ret;
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ret = FIELD_GET(AL3010_GAIN_MASK, ret);
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*val = al3010_scales[ret][0];
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*val2 = al3010_scales[ret][1];
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int al3010_write_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 al3010_data *data = iio_priv(indio_dev);
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int i;
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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for (i = 0; i < ARRAY_SIZE(al3010_scales); i++) {
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if (val != al3010_scales[i][0] ||
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val2 != al3010_scales[i][1])
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continue;
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return i2c_smbus_write_byte_data(data->client,
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AL3010_REG_CONFIG,
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FIELD_PREP(AL3010_GAIN_MASK, i));
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}
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break;
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}
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return -EINVAL;
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}
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static const struct iio_info al3010_info = {
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.read_raw = al3010_read_raw,
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.write_raw = al3010_write_raw,
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.attrs = &al3010_attribute_group,
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};
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static int al3010_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct al3010_data *data;
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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(&client->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->client = client;
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &al3010_info;
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indio_dev->name = AL3010_DRV_NAME;
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indio_dev->channels = al3010_channels;
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indio_dev->num_channels = ARRAY_SIZE(al3010_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = al3010_init(data);
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if (ret < 0) {
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dev_err(&client->dev, "al3010 chip init failed\n");
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return ret;
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}
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ret = devm_add_action_or_reset(&client->dev,
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al3010_set_pwr_off,
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data);
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if (ret < 0)
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return ret;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static int __maybe_unused al3010_suspend(struct device *dev)
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{
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return al3010_set_pwr(to_i2c_client(dev), false);
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}
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static int __maybe_unused al3010_resume(struct device *dev)
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{
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return al3010_set_pwr(to_i2c_client(dev), true);
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}
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static SIMPLE_DEV_PM_OPS(al3010_pm_ops, al3010_suspend, al3010_resume);
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static const struct i2c_device_id al3010_id[] = {
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{"al3010", },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, al3010_id);
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static const struct of_device_id al3010_of_match[] = {
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{ .compatible = "dynaimage,al3010", },
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{},
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};
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MODULE_DEVICE_TABLE(of, al3010_of_match);
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static struct i2c_driver al3010_driver = {
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.driver = {
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.name = AL3010_DRV_NAME,
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.of_match_table = al3010_of_match,
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.pm = &al3010_pm_ops,
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},
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.probe = al3010_probe,
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.id_table = al3010_id,
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};
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module_i2c_driver(al3010_driver);
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MODULE_AUTHOR("Daniel Baluta <daniel.baluta@nxp.com>");
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MODULE_AUTHOR("David Heidelberg <david@ixit.cz>");
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MODULE_DESCRIPTION("AL3010 Ambient Light Sensor driver");
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MODULE_LICENSE("GPL v2");
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