#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mod_devicetable.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;
int adc_int_us[2];
struct {
__be16 channels[2];
aligned_s64 ts;
} scan;
};
static const int hdc100x_int_time[][3] = {
{ 6350, 3650, 0 },
{ 6500, 3850, 2500 },
};
static const struct {
int shift;
int mask;
} hdc100x_resolution_shift[2] = {
{
.shift = 10,
.mask = 1
},
{
.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;
ret = i2c_smbus_write_byte(client, chan->address);
if (ret < 0) {
dev_err(&client->dev, "cannot start measurement");
return ret;
}
usleep_range(delay, delay + 1000);
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;
guard(mutex)(&data->lock);
if (chan->type == IIO_CURRENT) {
*val = hdc100x_get_heater_status(data);
return IIO_VAL_INT;
}
if (!iio_device_claim_direct(indio_dev))
return -EBUSY;
ret = hdc100x_get_measurement(data, chan);
iio_device_release_direct(indio_dev);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
}
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);
switch (mask) {
case IIO_CHAN_INFO_INT_TIME: {
if (val != 0)
return -EINVAL;
guard(mutex)(&data->lock);
return hdc100x_set_it_time(data, chan->address, val2);
}
case IIO_CHAN_INFO_RAW: {
if (chan->type != IIO_CURRENT || val2 != 0)
return -EINVAL;
guard(mutex)(&data->lock);
return hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
}
default:
return -EINVAL;
}
}
static int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
{
struct hdc100x_data *data = iio_priv(indio_dev);
guard(mutex)(&data->lock);
return hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
HDC100X_REG_CONFIG_ACQ_MODE);
}
static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
{
struct hdc100x_data *data = iio_priv(indio_dev);
guard(mutex)(&data->lock);
return hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
}
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;
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)
{
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->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;
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 = devm_iio_triggered_buffer_setup(&client->dev,
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;
}
return devm_iio_device_register(&client->dev, indio_dev);
}
static const struct i2c_device_id hdc100x_id[] = {
{ "hdc100x" },
{ "hdc1000" },
{ "hdc1008" },
{ "hdc1010" },
{ "hdc1050" },
{ "hdc1080" },
{ }
};
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 const struct acpi_device_id hdc100x_acpi_match[] = {
{ "TXNW1010" },
{ }
};
MODULE_DEVICE_TABLE(acpi, hdc100x_acpi_match);
static struct i2c_driver hdc100x_driver = {
.driver = {
.name = "hdc100x",
.of_match_table = hdc100x_dt_ids,
.acpi_match_table = hdc100x_acpi_match,
},
.probe = hdc100x_probe,
.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");
