mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Jonathan Cameron](/assets/img/avatar_default.png)
This prevents use of this driver with ACPI via PRP0001 and is an example of an anti pattern I'm trying to remove from IIO. Hence drop from this driver. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Ludovic Tancerel <ludovic.tancerel@maplehightech.com> Link: https://lore.kernel.org/r/20200910173242.621168-37-jic23@kernel.org
260 lines
6.5 KiB
C
260 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* htu21.c - Support for Measurement-Specialties
|
|
* htu21 temperature & humidity sensor
|
|
* and humidity part of MS8607 sensor
|
|
*
|
|
* Copyright (c) 2014 Measurement-Specialties
|
|
*
|
|
* (7-bit I2C slave address 0x40)
|
|
*
|
|
* Datasheet:
|
|
* http://www.meas-spec.com/downloads/HTU21D.pdf
|
|
* Datasheet:
|
|
* http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
|
|
#include "../common/ms_sensors/ms_sensors_i2c.h"
|
|
|
|
#define HTU21_RESET 0xFE
|
|
|
|
enum {
|
|
HTU21,
|
|
MS8607
|
|
};
|
|
|
|
static const int htu21_samp_freq[4] = { 20, 40, 70, 120 };
|
|
/* String copy of the above const for readability purpose */
|
|
static const char htu21_show_samp_freq[] = "20 40 70 120";
|
|
|
|
static int htu21_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *channel, int *val,
|
|
int *val2, long mask)
|
|
{
|
|
int ret, temperature;
|
|
unsigned int humidity;
|
|
struct ms_ht_dev *dev_data = iio_priv(indio_dev);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_PROCESSED:
|
|
switch (channel->type) {
|
|
case IIO_TEMP: /* in milli °C */
|
|
ret = ms_sensors_ht_read_temperature(dev_data,
|
|
&temperature);
|
|
if (ret)
|
|
return ret;
|
|
*val = temperature;
|
|
|
|
return IIO_VAL_INT;
|
|
case IIO_HUMIDITYRELATIVE: /* in milli %RH */
|
|
ret = ms_sensors_ht_read_humidity(dev_data,
|
|
&humidity);
|
|
if (ret)
|
|
return ret;
|
|
*val = humidity;
|
|
|
|
return IIO_VAL_INT;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
*val = htu21_samp_freq[dev_data->res_index];
|
|
|
|
return IIO_VAL_INT;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int htu21_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct ms_ht_dev *dev_data = iio_priv(indio_dev);
|
|
int i, ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
i = ARRAY_SIZE(htu21_samp_freq);
|
|
while (i-- > 0)
|
|
if (val == htu21_samp_freq[i])
|
|
break;
|
|
if (i < 0)
|
|
return -EINVAL;
|
|
mutex_lock(&dev_data->lock);
|
|
dev_data->res_index = i;
|
|
ret = ms_sensors_write_resolution(dev_data, i);
|
|
mutex_unlock(&dev_data->lock);
|
|
|
|
return ret;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct iio_chan_spec htu21_channels[] = {
|
|
{
|
|
.type = IIO_TEMP,
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
},
|
|
{
|
|
.type = IIO_HUMIDITYRELATIVE,
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Meas Spec recommendation is to not read temperature
|
|
* on this driver part for MS8607
|
|
*/
|
|
static const struct iio_chan_spec ms8607_channels[] = {
|
|
{
|
|
.type = IIO_HUMIDITYRELATIVE,
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
}
|
|
};
|
|
|
|
static ssize_t htu21_show_battery_low(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ms_ht_dev *dev_data = iio_priv(indio_dev);
|
|
|
|
return ms_sensors_show_battery_low(dev_data, buf);
|
|
}
|
|
|
|
static ssize_t htu21_show_heater(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ms_ht_dev *dev_data = iio_priv(indio_dev);
|
|
|
|
return ms_sensors_show_heater(dev_data, buf);
|
|
}
|
|
|
|
static ssize_t htu21_write_heater(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ms_ht_dev *dev_data = iio_priv(indio_dev);
|
|
|
|
return ms_sensors_write_heater(dev_data, buf, len);
|
|
}
|
|
|
|
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(htu21_show_samp_freq);
|
|
static IIO_DEVICE_ATTR(battery_low, S_IRUGO,
|
|
htu21_show_battery_low, NULL, 0);
|
|
static IIO_DEVICE_ATTR(heater_enable, S_IRUGO | S_IWUSR,
|
|
htu21_show_heater, htu21_write_heater, 0);
|
|
|
|
static struct attribute *htu21_attributes[] = {
|
|
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
|
&iio_dev_attr_battery_low.dev_attr.attr,
|
|
&iio_dev_attr_heater_enable.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group htu21_attribute_group = {
|
|
.attrs = htu21_attributes,
|
|
};
|
|
|
|
static const struct iio_info htu21_info = {
|
|
.read_raw = htu21_read_raw,
|
|
.write_raw = htu21_write_raw,
|
|
.attrs = &htu21_attribute_group,
|
|
};
|
|
|
|
static int htu21_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ms_ht_dev *dev_data;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
u64 serial_number;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_WRITE_BYTE |
|
|
I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
|
|
dev_err(&client->dev,
|
|
"Adapter does not support some i2c transaction\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
dev_data = iio_priv(indio_dev);
|
|
dev_data->client = client;
|
|
dev_data->res_index = 0;
|
|
mutex_init(&dev_data->lock);
|
|
|
|
indio_dev->info = &htu21_info;
|
|
indio_dev->name = id->name;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
if (id->driver_data == MS8607) {
|
|
indio_dev->channels = ms8607_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(ms8607_channels);
|
|
} else {
|
|
indio_dev->channels = htu21_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(htu21_channels);
|
|
}
|
|
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
ret = ms_sensors_reset(client, HTU21_RESET, 15000);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ms_sensors_read_serial(client, &serial_number);
|
|
if (ret)
|
|
return ret;
|
|
dev_info(&client->dev, "Serial number : %llx", serial_number);
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id htu21_id[] = {
|
|
{"htu21", HTU21},
|
|
{"ms8607-humidity", MS8607},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, htu21_id);
|
|
|
|
static const struct of_device_id htu21_of_match[] = {
|
|
{ .compatible = "meas,htu21", },
|
|
{ .compatible = "meas,ms8607-humidity", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, htu21_of_match);
|
|
|
|
static struct i2c_driver htu21_driver = {
|
|
.probe = htu21_probe,
|
|
.id_table = htu21_id,
|
|
.driver = {
|
|
.name = "htu21",
|
|
.of_match_table = htu21_of_match,
|
|
},
|
|
};
|
|
|
|
module_i2c_driver(htu21_driver);
|
|
|
|
MODULE_DESCRIPTION("Measurement-Specialties htu21 temperature and humidity driver");
|
|
MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
|
|
MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
|
|
MODULE_LICENSE("GPL v2");
|