diff options
Diffstat (limited to 'drivers/iio/humidity/hdc100x.c')
| -rw-r--r-- | drivers/iio/humidity/hdc100x.c | 452 |
1 files changed, 452 insertions, 0 deletions
diff --git a/drivers/iio/humidity/hdc100x.c b/drivers/iio/humidity/hdc100x.c new file mode 100644 index 000000000..51ad5a9ed --- /dev/null +++ b/drivers/iio/humidity/hdc100x.c @@ -0,0 +1,452 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * hdc100x.c - Support for the TI HDC100x temperature + humidity sensors + * + * Copyright (C) 2015, 2018 + * Author: Matt Ranostay <matt.ranostay@konsulko.com> + * + * Datasheets: + * http://www.ti.com/product/HDC1000/datasheet + * http://www.ti.com/product/HDC1008/datasheet + * http://www.ti.com/product/HDC1010/datasheet + * http://www.ti.com/product/HDC1050/datasheet + * http://www.ti.com/product/HDC1080/datasheet + */ + +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#include <linux/time.h> + +#define HDC100X_REG_TEMP 0x00 +#define HDC100X_REG_HUMIDITY 0x01 + +#define HDC100X_REG_CONFIG 0x02 +#define HDC100X_REG_CONFIG_ACQ_MODE BIT(12) +#define HDC100X_REG_CONFIG_HEATER_EN BIT(13) + +struct hdc100x_data { + struct i2c_client *client; + struct mutex lock; + u16 config; + + /* integration time of the sensor */ + int adc_int_us[2]; + /* Ensure natural alignment of timestamp */ + struct { + __be16 channels[2]; + s64 ts __aligned(8); + } scan; +}; + +/* integration time in us */ +static const int hdc100x_int_time[][3] = { + { 6350, 3650, 0 }, /* IIO_TEMP channel*/ + { 6500, 3850, 2500 }, /* IIO_HUMIDITYRELATIVE channel */ +}; + +/* HDC100X_REG_CONFIG shift and mask values */ +static const struct { + int shift; + int mask; +} hdc100x_resolution_shift[2] = { + { /* IIO_TEMP channel */ + .shift = 10, + .mask = 1 + }, + { /* IIO_HUMIDITYRELATIVE channel */ + .shift = 8, + .mask = 3, + }, +}; + +static IIO_CONST_ATTR(temp_integration_time_available, + "0.00365 0.00635"); + +static IIO_CONST_ATTR(humidityrelative_integration_time_available, + "0.0025 0.00385 0.0065"); + +static IIO_CONST_ATTR(out_current_heater_raw_available, + "0 1"); + +static struct attribute *hdc100x_attributes[] = { + &iio_const_attr_temp_integration_time_available.dev_attr.attr, + &iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr, + &iio_const_attr_out_current_heater_raw_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group hdc100x_attribute_group = { + .attrs = hdc100x_attributes, +}; + +static const struct iio_chan_spec hdc100x_channels[] = { + { + .type = IIO_TEMP, + .address = HDC100X_REG_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_OFFSET), + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_BE, + }, + }, + { + .type = IIO_HUMIDITYRELATIVE, + .address = HDC100X_REG_HUMIDITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_INT_TIME), + .scan_index = 1, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_BE, + }, + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .extend_name = "heater", + .output = 1, + .scan_index = -1, + }, + IIO_CHAN_SOFT_TIMESTAMP(2), +}; + +static const unsigned long hdc100x_scan_masks[] = {0x3, 0}; + +static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val) +{ + int tmp = (~mask & data->config) | val; + int ret; + + ret = i2c_smbus_write_word_swapped(data->client, + HDC100X_REG_CONFIG, tmp); + if (!ret) + data->config = tmp; + + return ret; +} + +static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2) +{ + int shift = hdc100x_resolution_shift[chan].shift; + int ret = -EINVAL; + int i; + + for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) { + if (val2 && val2 == hdc100x_int_time[chan][i]) { + ret = hdc100x_update_config(data, + hdc100x_resolution_shift[chan].mask << shift, + i << shift); + if (!ret) + data->adc_int_us[chan] = val2; + break; + } + } + + return ret; +} + +static int hdc100x_get_measurement(struct hdc100x_data *data, + struct iio_chan_spec const *chan) +{ + struct i2c_client *client = data->client; + int delay = data->adc_int_us[chan->address] + 1*USEC_PER_MSEC; + int ret; + __be16 val; + + /* start measurement */ + ret = i2c_smbus_write_byte(client, chan->address); + if (ret < 0) { + dev_err(&client->dev, "cannot start measurement"); + return ret; + } + + /* wait for integration time to pass */ + usleep_range(delay, delay + 1000); + + /* read measurement */ + ret = i2c_master_recv(data->client, (char *)&val, sizeof(val)); + if (ret < 0) { + dev_err(&client->dev, "cannot read sensor data\n"); + return ret; + } + return be16_to_cpu(val); +} + +static int hdc100x_get_heater_status(struct hdc100x_data *data) +{ + return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN); +} + +static int hdc100x_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct hdc100x_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: { + int ret; + + mutex_lock(&data->lock); + if (chan->type == IIO_CURRENT) { + *val = hdc100x_get_heater_status(data); + ret = IIO_VAL_INT; + } else { + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) { + mutex_unlock(&data->lock); + return ret; + } + + ret = hdc100x_get_measurement(data, chan); + iio_device_release_direct_mode(indio_dev); + if (ret >= 0) { + *val = ret; + ret = IIO_VAL_INT; + } + } + mutex_unlock(&data->lock); + return ret; + } + case IIO_CHAN_INFO_INT_TIME: + *val = 0; + *val2 = data->adc_int_us[chan->address]; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_TEMP) { + *val = 165000; + *val2 = 65536; + return IIO_VAL_FRACTIONAL; + } else { + *val = 100000; + *val2 = 65536; + return IIO_VAL_FRACTIONAL; + } + break; + case IIO_CHAN_INFO_OFFSET: + *val = -15887; + *val2 = 515151; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int hdc100x_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct hdc100x_data *data = iio_priv(indio_dev); + int ret = -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + if (val != 0) + return -EINVAL; + + mutex_lock(&data->lock); + ret = hdc100x_set_it_time(data, chan->address, val2); + mutex_unlock(&data->lock); + return ret; + case IIO_CHAN_INFO_RAW: + if (chan->type != IIO_CURRENT || val2 != 0) + return -EINVAL; + + mutex_lock(&data->lock); + ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN, + val ? HDC100X_REG_CONFIG_HEATER_EN : 0); + mutex_unlock(&data->lock); + return ret; + default: + return -EINVAL; + } +} + +static int hdc100x_buffer_postenable(struct iio_dev *indio_dev) +{ + struct hdc100x_data *data = iio_priv(indio_dev); + int ret; + + /* Buffer is enabled. First set ACQ Mode, then attach poll func */ + mutex_lock(&data->lock); + ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, + HDC100X_REG_CONFIG_ACQ_MODE); + mutex_unlock(&data->lock); + if (ret) + return ret; + + return iio_triggered_buffer_postenable(indio_dev); +} + +static int hdc100x_buffer_predisable(struct iio_dev *indio_dev) +{ + struct hdc100x_data *data = iio_priv(indio_dev); + int ret; + + /* First detach poll func, then reset ACQ mode. OK to disable buffer */ + ret = iio_triggered_buffer_predisable(indio_dev); + if (ret) + return ret; + + mutex_lock(&data->lock); + ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0); + mutex_unlock(&data->lock); + + return ret; +} + +static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = { + .postenable = hdc100x_buffer_postenable, + .predisable = hdc100x_buffer_predisable, +}; + +static irqreturn_t hdc100x_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct hdc100x_data *data = iio_priv(indio_dev); + struct i2c_client *client = data->client; + int delay = data->adc_int_us[0] + data->adc_int_us[1] + 2*USEC_PER_MSEC; + int ret; + + /* dual read starts at temp register */ + mutex_lock(&data->lock); + ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP); + if (ret < 0) { + dev_err(&client->dev, "cannot start measurement\n"); + goto err; + } + usleep_range(delay, delay + 1000); + + ret = i2c_master_recv(client, (u8 *)data->scan.channels, 4); + if (ret < 0) { + dev_err(&client->dev, "cannot read sensor data\n"); + goto err; + } + + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, + iio_get_time_ns(indio_dev)); +err: + mutex_unlock(&data->lock); + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static const struct iio_info hdc100x_info = { + .read_raw = hdc100x_read_raw, + .write_raw = hdc100x_write_raw, + .attrs = &hdc100x_attribute_group, +}; + +static int hdc100x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct iio_dev *indio_dev; + struct hdc100x_data *data; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C)) + return -EOPNOTSUPP; + + 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; + mutex_init(&data->lock); + + indio_dev->dev.parent = &client->dev; + indio_dev->name = dev_name(&client->dev); + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &hdc100x_info; + + indio_dev->channels = hdc100x_channels; + indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels); + indio_dev->available_scan_masks = hdc100x_scan_masks; + + /* be sure we are in a known state */ + hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]); + hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]); + hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0); + + ret = iio_triggered_buffer_setup(indio_dev, NULL, + hdc100x_trigger_handler, + &hdc_buffer_setup_ops); + if (ret < 0) { + dev_err(&client->dev, "iio triggered buffer setup failed\n"); + return ret; + } + ret = iio_device_register(indio_dev); + if (ret < 0) + iio_triggered_buffer_cleanup(indio_dev); + + return ret; +} + +static int hdc100x_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + + return 0; +} + +static const struct i2c_device_id hdc100x_id[] = { + { "hdc100x", 0 }, + { "hdc1000", 0 }, + { "hdc1008", 0 }, + { "hdc1010", 0 }, + { "hdc1050", 0 }, + { "hdc1080", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, hdc100x_id); + +static const struct of_device_id hdc100x_dt_ids[] = { + { .compatible = "ti,hdc1000" }, + { .compatible = "ti,hdc1008" }, + { .compatible = "ti,hdc1010" }, + { .compatible = "ti,hdc1050" }, + { .compatible = "ti,hdc1080" }, + { } +}; +MODULE_DEVICE_TABLE(of, hdc100x_dt_ids); + +static struct i2c_driver hdc100x_driver = { + .driver = { + .name = "hdc100x", + .of_match_table = of_match_ptr(hdc100x_dt_ids), + }, + .probe = hdc100x_probe, + .remove = hdc100x_remove, + .id_table = hdc100x_id, +}; +module_i2c_driver(hdc100x_driver); + +MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>"); +MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver"); +MODULE_LICENSE("GPL"); |