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264 lines
6.3 KiB
264 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AL3320A - Dyna Image Ambient Light Sensor |
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* |
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* Copyright (c) 2014, Intel Corporation. |
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* |
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* IIO driver for AL3320A (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 AL3320A_DRV_NAME "al3320a" |
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#define AL3320A_REG_CONFIG 0x00 |
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#define AL3320A_REG_STATUS 0x01 |
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#define AL3320A_REG_INT 0x02 |
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#define AL3320A_REG_WAIT 0x06 |
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#define AL3320A_REG_CONFIG_RANGE 0x07 |
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#define AL3320A_REG_PERSIST 0x08 |
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#define AL3320A_REG_MEAN_TIME 0x09 |
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#define AL3320A_REG_ADUMMY 0x0A |
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#define AL3320A_REG_DATA_LOW 0x22 |
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#define AL3320A_REG_LOW_THRESH_LOW 0x30 |
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#define AL3320A_REG_LOW_THRESH_HIGH 0x31 |
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#define AL3320A_REG_HIGH_THRESH_LOW 0x32 |
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#define AL3320A_REG_HIGH_THRESH_HIGH 0x33 |
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#define AL3320A_CONFIG_DISABLE 0x00 |
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#define AL3320A_CONFIG_ENABLE 0x01 |
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#define AL3320A_GAIN_MASK GENMASK(2, 1) |
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/* chip params default values */ |
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#define AL3320A_DEFAULT_MEAN_TIME 4 |
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#define AL3320A_DEFAULT_WAIT_TIME 0 /* no waiting */ |
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#define AL3320A_SCALE_AVAILABLE "0.512 0.128 0.032 0.01" |
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enum al3320a_range { |
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AL3320A_RANGE_1, /* 33.28 Klx */ |
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AL3320A_RANGE_2, /* 8.32 Klx */ |
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AL3320A_RANGE_3, /* 2.08 Klx */ |
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AL3320A_RANGE_4 /* 0.65 Klx */ |
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}; |
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static const int al3320a_scales[][2] = { |
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{0, 512000}, {0, 128000}, {0, 32000}, {0, 10000} |
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}; |
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struct al3320a_data { |
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struct i2c_client *client; |
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}; |
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static const struct iio_chan_spec al3320a_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, AL3320A_SCALE_AVAILABLE); |
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static struct attribute *al3320a_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 al3320a_attribute_group = { |
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.attrs = al3320a_attributes, |
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}; |
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static int al3320a_set_pwr(struct i2c_client *client, bool pwr) |
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{ |
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u8 val = pwr ? AL3320A_CONFIG_ENABLE : AL3320A_CONFIG_DISABLE; |
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return i2c_smbus_write_byte_data(client, AL3320A_REG_CONFIG, val); |
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} |
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static void al3320a_set_pwr_off(void *_data) |
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{ |
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struct al3320a_data *data = _data; |
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al3320a_set_pwr(data->client, false); |
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} |
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static int al3320a_init(struct al3320a_data *data) |
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{ |
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int ret; |
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ret = al3320a_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, AL3320A_REG_CONFIG_RANGE, |
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FIELD_PREP(AL3320A_GAIN_MASK, |
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AL3320A_RANGE_3)); |
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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, AL3320A_REG_MEAN_TIME, |
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AL3320A_DEFAULT_MEAN_TIME); |
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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, AL3320A_REG_WAIT, |
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AL3320A_DEFAULT_WAIT_TIME); |
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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 al3320a_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 al3320a_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 AL3320A_REG_DATA_LOW |
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* - high byte of output is stored at AL3320A_REG_DATA_LOW + 1 |
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*/ |
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ret = i2c_smbus_read_word_data(data->client, |
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AL3320A_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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AL3320A_REG_CONFIG_RANGE); |
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if (ret < 0) |
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return ret; |
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ret = FIELD_GET(AL3320A_GAIN_MASK, ret); |
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*val = al3320a_scales[ret][0]; |
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*val2 = al3320a_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 al3320a_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 al3320a_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(al3320a_scales); i++) { |
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if (val != al3320a_scales[i][0] || |
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val2 != al3320a_scales[i][1]) |
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continue; |
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return i2c_smbus_write_byte_data(data->client, |
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AL3320A_REG_CONFIG_RANGE, |
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FIELD_PREP(AL3320A_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 al3320a_info = { |
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.read_raw = al3320a_read_raw, |
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.write_raw = al3320a_write_raw, |
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.attrs = &al3320a_attribute_group, |
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}; |
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static int al3320a_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct al3320a_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->info = &al3320a_info; |
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indio_dev->name = AL3320A_DRV_NAME; |
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indio_dev->channels = al3320a_channels; |
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indio_dev->num_channels = ARRAY_SIZE(al3320a_channels); |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = al3320a_init(data); |
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if (ret < 0) { |
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dev_err(&client->dev, "al3320a 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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al3320a_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 al3320a_suspend(struct device *dev) |
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{ |
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return al3320a_set_pwr(to_i2c_client(dev), false); |
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} |
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static int __maybe_unused al3320a_resume(struct device *dev) |
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{ |
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return al3320a_set_pwr(to_i2c_client(dev), true); |
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} |
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static SIMPLE_DEV_PM_OPS(al3320a_pm_ops, al3320a_suspend, al3320a_resume); |
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static const struct i2c_device_id al3320a_id[] = { |
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{"al3320a", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, al3320a_id); |
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static const struct of_device_id al3320a_of_match[] = { |
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{ .compatible = "dynaimage,al3320a", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, al3320a_of_match); |
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static struct i2c_driver al3320a_driver = { |
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.driver = { |
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.name = AL3320A_DRV_NAME, |
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.of_match_table = al3320a_of_match, |
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.pm = &al3320a_pm_ops, |
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}, |
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.probe = al3320a_probe, |
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.id_table = al3320a_id, |
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}; |
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module_i2c_driver(al3320a_driver); |
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MODULE_AUTHOR("Daniel Baluta <[email protected]>"); |
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MODULE_DESCRIPTION("AL3320A Ambient Light Sensor driver"); |
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MODULE_LICENSE("GPL v2");
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