hwmon: Honeywell Humidicon HIH-6130/HIH-6131 humidity and temperature sensor driver
This is a new driver for the Honeywell Humidicon HIH-6130/HIH-6131 humidity sensor. The driver is based on the existing Sensiron sht21 driver with the necessary changes to the probe, update_measurements and conversion functions necessary to use the Honeywell sensors. There's no difference between the 6130 & 6131 other than the 6131 having an external condensation filter attached. Signed-off-by: Iain Paton <ipaton0@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Iain Paton
Guenter Roeck
Родитель
edf48f3a73
Коммит
27f8b13555
|
|
@ -0,0 +1,37 @@
|
|||
Kernel driver hih6130
|
||||
=====================
|
||||
|
||||
Supported chips:
|
||||
* Honeywell HIH-6130 / HIH-6131
|
||||
Prefix: 'hih6130'
|
||||
Addresses scanned: none
|
||||
Datasheet: Publicly available at the Honeywell website
|
||||
http://sensing.honeywell.com/index.php?ci_id=3106&la_id=1&defId=44872
|
||||
|
||||
Author:
|
||||
Iain Paton <ipaton0@gmail.com>
|
||||
|
||||
Description
|
||||
-----------
|
||||
|
||||
The HIH-6130 & HIH-6131 are humidity and temperature sensors in a SO8 package.
|
||||
The difference between the two devices is that the HIH-6131 has a condensation
|
||||
filter.
|
||||
|
||||
The devices communicate with the I2C protocol. All sensors are set to the same
|
||||
I2C address 0x27 by default, so an entry with I2C_BOARD_INFO("hih6130", 0x27)
|
||||
can be used in the board setup code.
|
||||
|
||||
Please see Documentation/i2c/instantiating-devices for details on how to
|
||||
instantiate I2C devices.
|
||||
|
||||
sysfs-Interface
|
||||
---------------
|
||||
|
||||
temp1_input - temperature input
|
||||
humidity1_input - humidity input
|
||||
|
||||
Notes
|
||||
-----
|
||||
|
||||
Command mode and alarms are not currently supported.
|
||||
|
|
@ -443,6 +443,16 @@ config SENSORS_GPIO_FAN
|
|||
This driver can also be built as a module. If so, the module
|
||||
will be called gpio-fan.
|
||||
|
||||
config SENSORS_HIH6130
|
||||
tristate "Honeywell Humidicon HIH-6130 humidity/temperature sensor"
|
||||
depends on I2C && EXPERIMENTAL
|
||||
help
|
||||
If you say yes here you get support for Honeywell Humidicon
|
||||
HIH-6130 and HIH-6131 Humidicon humidity sensors.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called hih6130.
|
||||
|
||||
config SENSORS_CORETEMP
|
||||
tristate "Intel Core/Core2/Atom temperature sensor"
|
||||
depends on X86 && PCI && EXPERIMENTAL
|
||||
|
|
|
|||
|
|
@ -59,6 +59,7 @@ obj-$(CONFIG_SENSORS_G760A) += g760a.o
|
|||
obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
|
||||
obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
|
||||
obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o
|
||||
obj-$(CONFIG_SENSORS_HIH6130) += hih6130.o
|
||||
obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
|
||||
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
|
||||
obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,293 @@
|
|||
/* Honeywell HIH-6130/HIH-6131 humidity and temperature sensor driver
|
||||
*
|
||||
* Copyright (C) 2012 Iain Paton <ipaton0@gmail.com>
|
||||
*
|
||||
* heavily based on the sht21 driver
|
||||
* Copyright (C) 2010 Urs Fleisch <urs.fleisch@sensirion.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*
|
||||
* Data sheets available (2012-06-22) at
|
||||
* http://sensing.honeywell.com/index.php?ci_id=3106&la_id=1&defId=44872
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/hwmon.h>
|
||||
#include <linux/hwmon-sysfs.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/delay.h>
|
||||
|
||||
/**
|
||||
* struct hih6130 - HIH-6130 device specific data
|
||||
* @hwmon_dev: device registered with hwmon
|
||||
* @lock: mutex to protect measurement values
|
||||
* @valid: only false before first measurement is taken
|
||||
* @last_update: time of last update (jiffies)
|
||||
* @temperature: cached temperature measurement value
|
||||
* @humidity: cached humidity measurement value
|
||||
*/
|
||||
struct hih6130 {
|
||||
struct device *hwmon_dev;
|
||||
struct mutex lock;
|
||||
bool valid;
|
||||
unsigned long last_update;
|
||||
int temperature;
|
||||
int humidity;
|
||||
};
|
||||
|
||||
/**
|
||||
* hih6130_temp_ticks_to_millicelsius() - convert raw temperature ticks to
|
||||
* milli celsius
|
||||
* @ticks: temperature ticks value received from sensor
|
||||
*/
|
||||
static inline int hih6130_temp_ticks_to_millicelsius(int ticks)
|
||||
{
|
||||
|
||||
ticks = ticks >> 2;
|
||||
/*
|
||||
* from data sheet section 5.0
|
||||
* Formula T = ( ticks / ( 2^14 - 2 ) ) * 165 -40
|
||||
*/
|
||||
return (DIV_ROUND_CLOSEST(ticks * 1650, 16382) - 400) * 100;
|
||||
}
|
||||
|
||||
/**
|
||||
* hih6130_rh_ticks_to_per_cent_mille() - convert raw humidity ticks to
|
||||
* one-thousandths of a percent relative humidity
|
||||
* @ticks: humidity ticks value received from sensor
|
||||
*/
|
||||
static inline int hih6130_rh_ticks_to_per_cent_mille(int ticks)
|
||||
{
|
||||
|
||||
ticks &= ~0xC000; /* clear status bits */
|
||||
/*
|
||||
* from data sheet section 4.0
|
||||
* Formula RH = ( ticks / ( 2^14 -2 ) ) * 100
|
||||
*/
|
||||
return DIV_ROUND_CLOSEST(ticks * 1000, 16382) * 100;
|
||||
}
|
||||
|
||||
/**
|
||||
* hih6130_update_measurements() - get updated measurements from device
|
||||
* @client: I2C client device
|
||||
*
|
||||
* Returns 0 on success, else negative errno.
|
||||
*/
|
||||
static int hih6130_update_measurements(struct i2c_client *client)
|
||||
{
|
||||
int ret = 0;
|
||||
int t;
|
||||
struct hih6130 *hih6130 = i2c_get_clientdata(client);
|
||||
unsigned char tmp[4];
|
||||
struct i2c_msg msgs[1] = {
|
||||
{
|
||||
.addr = client->addr,
|
||||
.flags = I2C_M_RD,
|
||||
.len = 4,
|
||||
.buf = tmp,
|
||||
}
|
||||
};
|
||||
|
||||
mutex_lock(&hih6130->lock);
|
||||
|
||||
/*
|
||||
* While the measurement can be completed in ~40ms the sensor takes
|
||||
* much longer to react to a change in external conditions. How quickly
|
||||
* it reacts depends on airflow and other factors outwith our control.
|
||||
* The datasheet specifies maximum 'Response time' for humidity at 8s
|
||||
* and temperature at 30s under specified conditions.
|
||||
* We therefore choose to only read the sensor at most once per second.
|
||||
* This trades off pointless activity polling the sensor much faster
|
||||
* than it can react against better response times in conditions more
|
||||
* favourable than specified in the datasheet.
|
||||
*/
|
||||
if (time_after(jiffies, hih6130->last_update + HZ) || !hih6130->valid) {
|
||||
|
||||
/* write to slave address, no data, to request a measurement */
|
||||
ret = i2c_master_send(client, tmp, 0);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
/* measurement cycle time is ~36.65msec */
|
||||
msleep(40);
|
||||
|
||||
ret = i2c_transfer(client->adapter, msgs, 1);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if ((tmp[0] & 0xC0) != 0) {
|
||||
dev_err(&client->dev, "Error while reading measurement result\n");
|
||||
ret = -EIO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
t = (tmp[0] << 8) + tmp[1];
|
||||
hih6130->humidity = hih6130_rh_ticks_to_per_cent_mille(t);
|
||||
|
||||
t = (tmp[2] << 8) + tmp[3];
|
||||
hih6130->temperature = hih6130_temp_ticks_to_millicelsius(t);
|
||||
|
||||
hih6130->last_update = jiffies;
|
||||
hih6130->valid = true;
|
||||
}
|
||||
out:
|
||||
mutex_unlock(&hih6130->lock);
|
||||
|
||||
return ret >= 0 ? 0 : ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* hih6130_show_temperature() - show temperature measurement value in sysfs
|
||||
* @dev: device
|
||||
* @attr: device attribute
|
||||
* @buf: sysfs buffer (PAGE_SIZE) where measurement values are written to
|
||||
*
|
||||
* Will be called on read access to temp1_input sysfs attribute.
|
||||
* Returns number of bytes written into buffer, negative errno on error.
|
||||
*/
|
||||
static ssize_t hih6130_show_temperature(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct hih6130 *hih6130 = i2c_get_clientdata(client);
|
||||
int ret = hih6130_update_measurements(client);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
return sprintf(buf, "%d\n", hih6130->temperature);
|
||||
}
|
||||
|
||||
/**
|
||||
* hih6130_show_humidity() - show humidity measurement value in sysfs
|
||||
* @dev: device
|
||||
* @attr: device attribute
|
||||
* @buf: sysfs buffer (PAGE_SIZE) where measurement values are written to
|
||||
*
|
||||
* Will be called on read access to humidity1_input sysfs attribute.
|
||||
* Returns number of bytes written into buffer, negative errno on error.
|
||||
*/
|
||||
static ssize_t hih6130_show_humidity(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct hih6130 *hih6130 = i2c_get_clientdata(client);
|
||||
int ret = hih6130_update_measurements(client);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
return sprintf(buf, "%d\n", hih6130->humidity);
|
||||
}
|
||||
|
||||
/* sysfs attributes */
|
||||
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, hih6130_show_temperature,
|
||||
NULL, 0);
|
||||
static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, hih6130_show_humidity,
|
||||
NULL, 0);
|
||||
|
||||
static struct attribute *hih6130_attributes[] = {
|
||||
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
||||
&sensor_dev_attr_humidity1_input.dev_attr.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct attribute_group hih6130_attr_group = {
|
||||
.attrs = hih6130_attributes,
|
||||
};
|
||||
|
||||
/**
|
||||
* hih6130_probe() - probe device
|
||||
* @client: I2C client device
|
||||
* @id: device ID
|
||||
*
|
||||
* Called by the I2C core when an entry in the ID table matches a
|
||||
* device's name.
|
||||
* Returns 0 on success.
|
||||
*/
|
||||
static int __devinit hih6130_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct hih6130 *hih6130;
|
||||
int err;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
||||
dev_err(&client->dev, "adapter does not support true I2C\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
hih6130 = devm_kzalloc(&client->dev, sizeof(*hih6130), GFP_KERNEL);
|
||||
if (!hih6130)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, hih6130);
|
||||
|
||||
mutex_init(&hih6130->lock);
|
||||
|
||||
err = sysfs_create_group(&client->dev.kobj, &hih6130_attr_group);
|
||||
if (err) {
|
||||
dev_dbg(&client->dev, "could not create sysfs files\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
hih6130->hwmon_dev = hwmon_device_register(&client->dev);
|
||||
if (IS_ERR(hih6130->hwmon_dev)) {
|
||||
dev_dbg(&client->dev, "unable to register hwmon device\n");
|
||||
err = PTR_ERR(hih6130->hwmon_dev);
|
||||
goto fail_remove_sysfs;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail_remove_sysfs:
|
||||
sysfs_remove_group(&client->dev.kobj, &hih6130_attr_group);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* hih6130_remove() - remove device
|
||||
* @client: I2C client device
|
||||
*/
|
||||
static int __devexit hih6130_remove(struct i2c_client *client)
|
||||
{
|
||||
struct hih6130 *hih6130 = i2c_get_clientdata(client);
|
||||
|
||||
hwmon_device_unregister(hih6130->hwmon_dev);
|
||||
sysfs_remove_group(&client->dev.kobj, &hih6130_attr_group);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Device ID table */
|
||||
static const struct i2c_device_id hih6130_id[] = {
|
||||
{ "hih6130", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, hih6130_id);
|
||||
|
||||
static struct i2c_driver hih6130_driver = {
|
||||
.driver.name = "hih6130",
|
||||
.probe = hih6130_probe,
|
||||
.remove = __devexit_p(hih6130_remove),
|
||||
.id_table = hih6130_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(hih6130_driver);
|
||||
|
||||
MODULE_AUTHOR("Iain Paton <ipaton0@gmail.com>");
|
||||
MODULE_DESCRIPTION("Honeywell HIH-6130 humidity and temperature sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Загрузка…
Ссылка в новой задаче