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256 lines
5.7 KiB
256 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* tsl4531.c - Support for TAOS TSL4531 ambient light sensor |
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* |
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* Copyright 2013 Peter Meerwald <[email protected]> |
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* |
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* IIO driver for the TSL4531x family |
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* TSL45311/TSL45313: 7-bit I2C slave address 0x39 |
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* TSL45315/TSL45317: 7-bit I2C slave address 0x29 |
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* |
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* TODO: single cycle measurement |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/err.h> |
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#include <linux/delay.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#define TSL4531_DRV_NAME "tsl4531" |
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#define TSL4531_COMMAND BIT(7) |
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#define TSL4531_CONTROL (TSL4531_COMMAND | 0x00) |
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#define TSL4531_CONFIG (TSL4531_COMMAND | 0x01) |
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#define TSL4531_DATA (TSL4531_COMMAND | 0x04) |
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#define TSL4531_ID (TSL4531_COMMAND | 0x0a) |
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/* operating modes in control register */ |
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#define TSL4531_MODE_POWERDOWN 0x00 |
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#define TSL4531_MODE_SINGLE_ADC 0x02 |
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#define TSL4531_MODE_NORMAL 0x03 |
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/* integration time control in config register */ |
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#define TSL4531_TCNTRL_400MS 0x00 |
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#define TSL4531_TCNTRL_200MS 0x01 |
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#define TSL4531_TCNTRL_100MS 0x02 |
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/* part number in id register */ |
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#define TSL45311_ID 0x8 |
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#define TSL45313_ID 0x9 |
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#define TSL45315_ID 0xa |
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#define TSL45317_ID 0xb |
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#define TSL4531_ID_SHIFT 4 |
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struct tsl4531_data { |
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struct i2c_client *client; |
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struct mutex lock; |
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int int_time; |
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}; |
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static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4"); |
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static struct attribute *tsl4531_attributes[] = { |
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&iio_const_attr_integration_time_available.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group tsl4531_attribute_group = { |
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.attrs = tsl4531_attributes, |
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}; |
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static const struct iio_chan_spec tsl4531_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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BIT(IIO_CHAN_INFO_INT_TIME) |
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} |
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}; |
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static int tsl4531_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct tsl4531_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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ret = i2c_smbus_read_word_data(data->client, |
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TSL4531_DATA); |
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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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/* 0.. 1x, 1 .. 2x, 2 .. 4x */ |
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*val = 1 << data->int_time; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_INT_TIME: |
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if (data->int_time == 0) |
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*val2 = 400000; |
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else if (data->int_time == 1) |
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*val2 = 200000; |
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else if (data->int_time == 2) |
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*val2 = 100000; |
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else |
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return -EINVAL; |
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*val = 0; |
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return IIO_VAL_INT_PLUS_MICRO; |
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default: |
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return -EINVAL; |
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} |
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} |
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static int tsl4531_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, int val2, long mask) |
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{ |
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struct tsl4531_data *data = iio_priv(indio_dev); |
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int int_time, ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_INT_TIME: |
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if (val != 0) |
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return -EINVAL; |
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if (val2 == 400000) |
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int_time = 0; |
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else if (val2 == 200000) |
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int_time = 1; |
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else if (val2 == 100000) |
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int_time = 2; |
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else |
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return -EINVAL; |
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mutex_lock(&data->lock); |
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ret = i2c_smbus_write_byte_data(data->client, |
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TSL4531_CONFIG, int_time); |
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if (ret >= 0) |
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data->int_time = int_time; |
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mutex_unlock(&data->lock); |
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return ret; |
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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 tsl4531_info = { |
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.read_raw = tsl4531_read_raw, |
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.write_raw = tsl4531_write_raw, |
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.attrs = &tsl4531_attribute_group, |
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}; |
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static int tsl4531_check_id(struct i2c_client *client) |
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{ |
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int ret = i2c_smbus_read_byte_data(client, TSL4531_ID); |
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if (ret < 0) |
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return ret; |
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switch (ret >> TSL4531_ID_SHIFT) { |
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case TSL45311_ID: |
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case TSL45313_ID: |
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case TSL45315_ID: |
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case TSL45317_ID: |
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return 0; |
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default: |
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return -ENODEV; |
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} |
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} |
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static int tsl4531_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct tsl4531_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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mutex_init(&data->lock); |
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ret = tsl4531_check_id(client); |
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if (ret) { |
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dev_err(&client->dev, "no TSL4531 sensor\n"); |
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return ret; |
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} |
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ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL, |
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TSL4531_MODE_NORMAL); |
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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, TSL4531_CONFIG, |
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TSL4531_TCNTRL_400MS); |
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if (ret < 0) |
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return ret; |
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indio_dev->info = &tsl4531_info; |
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indio_dev->channels = tsl4531_channels; |
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indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels); |
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indio_dev->name = TSL4531_DRV_NAME; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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return iio_device_register(indio_dev); |
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} |
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static int tsl4531_powerdown(struct i2c_client *client) |
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{ |
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return i2c_smbus_write_byte_data(client, TSL4531_CONTROL, |
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TSL4531_MODE_POWERDOWN); |
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} |
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static int tsl4531_remove(struct i2c_client *client) |
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{ |
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iio_device_unregister(i2c_get_clientdata(client)); |
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tsl4531_powerdown(client); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int tsl4531_suspend(struct device *dev) |
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{ |
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return tsl4531_powerdown(to_i2c_client(dev)); |
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} |
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static int tsl4531_resume(struct device *dev) |
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{ |
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return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL, |
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TSL4531_MODE_NORMAL); |
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} |
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static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume); |
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#define TSL4531_PM_OPS (&tsl4531_pm_ops) |
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#else |
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#define TSL4531_PM_OPS NULL |
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#endif |
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static const struct i2c_device_id tsl4531_id[] = { |
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{ "tsl4531", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tsl4531_id); |
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static struct i2c_driver tsl4531_driver = { |
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.driver = { |
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.name = TSL4531_DRV_NAME, |
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.pm = TSL4531_PM_OPS, |
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}, |
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.probe = tsl4531_probe, |
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.remove = tsl4531_remove, |
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.id_table = tsl4531_id, |
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}; |
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module_i2c_driver(tsl4531_driver); |
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MODULE_AUTHOR("Peter Meerwald <[email protected]>"); |
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MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver"); |
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MODULE_LICENSE("GPL");
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