hwmon: driver for Sensirion SHT21 humidity and temperature sensor
Urs Fleisch [Fri, 7 Jan 2011 07:15:39 +0000 (07:15 +0000)]
Signed-off-by: Urs Fleisch <urs.fleisch@sensirion.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

Documentation/hwmon/sht21 [new file with mode: 0644]
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/sht21.c [new file with mode: 0644]

diff --git a/Documentation/hwmon/sht21 b/Documentation/hwmon/sht21
new file mode 100644 (file)
index 0000000..db17fda
--- /dev/null
@@ -0,0 +1,49 @@
+Kernel driver sht21
+===================
+
+Supported chips:
+  * Sensirion SHT21
+    Prefix: 'sht21'
+    Addresses scanned: none
+    Datasheet: Publicly available at the Sensirion website
+    http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT21.pdf
+
+  * Sensirion SHT25
+    Prefix: 'sht21'
+    Addresses scanned: none
+    Datasheet: Publicly available at the Sensirion website
+    http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT25.pdf
+
+Author:
+  Urs Fleisch <urs.fleisch@sensirion.com>
+
+Description
+-----------
+
+The SHT21 and SHT25 are humidity and temperature sensors in a DFN package of
+only 3 x 3 mm footprint and 1.1 mm height. The difference between the two
+devices is the higher level of precision of the SHT25 (1.8% relative humidity,
+0.2 degree Celsius) compared with the SHT21 (2.0% relative humidity,
+0.3 degree Celsius).
+
+The devices communicate with the I2C protocol. All sensors are set to the same
+I2C address 0x40, so an entry with I2C_BOARD_INFO("sht21", 0x40) can be used
+in the board setup code.
+
+sysfs-Interface
+---------------
+
+temp1_input - temperature input
+humidity1_input - humidity input
+
+Notes
+-----
+
+The driver uses the default resolution settings of 12 bit for humidity and 14
+bit for temperature, which results in typical measurement times of 22 ms for
+humidity and 66 ms for temperature. To keep self heating below 0.1 degree
+Celsius, the device should not be active for more than 10% of the time,
+e.g. maximum two measurements per second at the given resolution.
+
+Different resolutions, the on-chip heater, using the CRC checksum and reading
+the serial number are not supported yet.
index a56f6ad..0f09567 100644 (file)
@@ -734,6 +734,16 @@ config SENSORS_SHT15
          This driver can also be built as a module.  If so, the module
          will be called sht15.
 
+config SENSORS_SHT21
+       tristate "Sensiron humidity and temperature sensors. SHT21 and compat."
+       depends on I2C
+       help
+         If you say yes here you get support for the Sensiron SHT21, SHT25
+         humidity and temperature sensors.
+
+         This driver can also be built as a module.  If so, the module
+         will be called sht21.
+
 config SENSORS_S3C
        tristate "Samsung built-in ADC"
        depends on S3C_ADC
index 2479b3d..20e7408 100644 (file)
@@ -90,6 +90,7 @@ obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
 obj-$(CONFIG_SENSORS_PCF8591)  += pcf8591.o
 obj-$(CONFIG_SENSORS_S3C)      += s3c-hwmon.o
 obj-$(CONFIG_SENSORS_SHT15)    += sht15.o
+obj-$(CONFIG_SENSORS_SHT21)    += sht21.o
 obj-$(CONFIG_SENSORS_SIS5595)  += sis5595.o
 obj-$(CONFIG_SENSORS_SMM665)   += smm665.o
 obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
diff --git a/drivers/hwmon/sht21.c b/drivers/hwmon/sht21.c
new file mode 100644 (file)
index 0000000..1c8c981
--- /dev/null
@@ -0,0 +1,307 @@
+/* Sensirion SHT21 humidity and temperature sensor 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 sheet available (5/2010) at
+ * http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT21.pdf
+ */
+
+#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>
+
+/* I2C command bytes */
+#define SHT21_TRIG_T_MEASUREMENT_HM  0xe3
+#define SHT21_TRIG_RH_MEASUREMENT_HM 0xe5
+
+/**
+ * struct sht21 - SHT21 device specific data
+ * @hwmon_dev: device registered with hwmon
+ * @lock: mutex to protect measurement values
+ * @valid: only 0 before first measurement is taken
+ * @last_update: time of last update (jiffies)
+ * @temperature: cached temperature measurement value
+ * @humidity: cached humidity measurement value
+ */
+struct sht21 {
+       struct device *hwmon_dev;
+       struct mutex lock;
+       char valid;
+       unsigned long last_update;
+       int temperature;
+       int humidity;
+};
+
+/**
+ * sht21_temp_ticks_to_millicelsius() - convert raw temperature ticks to
+ * milli celsius
+ * @ticks: temperature ticks value received from sensor
+ */
+static inline int sht21_temp_ticks_to_millicelsius(int ticks)
+{
+       ticks &= ~0x0003; /* clear status bits */
+       /*
+        * Formula T = -46.85 + 175.72 * ST / 2^16 from data sheet 6.2,
+        * optimized for integer fixed point (3 digits) arithmetic
+        */
+       return ((21965 * ticks) >> 13) - 46850;
+}
+
+/**
+ * sht21_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 sht21_rh_ticks_to_per_cent_mille(int ticks)
+{
+       ticks &= ~0x0003; /* clear status bits */
+       /*
+        * Formula RH = -6 + 125 * SRH / 2^16 from data sheet 6.1,
+        * optimized for integer fixed point (3 digits) arithmetic
+        */
+       return ((15625 * ticks) >> 13) - 6000;
+}
+
+/**
+ * sht21_read_word_data() - read word from register
+ * @client: I2C client device
+ * @reg: I2C command byte
+ *
+ * Returns value, negative errno on error.
+ */
+static inline int sht21_read_word_data(struct i2c_client *client, u8 reg)
+{
+       int ret = i2c_smbus_read_word_data(client, reg);
+       if (ret < 0)
+               return ret;
+       /*
+        * SMBus specifies low byte first, but the SHT21 returns MSB
+        * first, so we have to swab16 the values
+        */
+       return swab16(ret);
+}
+
+/**
+ * sht21_update_measurements() - get updated measurements from device
+ * @client: I2C client device
+ *
+ * Returns 0 on success, else negative errno.
+ */
+static int sht21_update_measurements(struct i2c_client *client)
+{
+       int ret = 0;
+       struct sht21 *sht21 = i2c_get_clientdata(client);
+
+       mutex_lock(&sht21->lock);
+       /*
+        * Data sheet 2.4:
+        * SHT2x should not be active for more than 10% of the time - e.g.
+        * maximum two measurements per second at 12bit accuracy shall be made.
+        */
+       if (time_after(jiffies, sht21->last_update + HZ / 2) || !sht21->valid) {
+               ret = sht21_read_word_data(client, SHT21_TRIG_T_MEASUREMENT_HM);
+               if (ret < 0)
+                       goto out;
+               sht21->temperature = sht21_temp_ticks_to_millicelsius(ret);
+               ret = sht21_read_word_data(client,
+                                       SHT21_TRIG_RH_MEASUREMENT_HM);
+               if (ret < 0)
+                       goto out;
+               sht21->humidity = sht21_rh_ticks_to_per_cent_mille(ret);
+               sht21->last_update = jiffies;
+               sht21->valid = 1;
+       }
+out:
+       mutex_unlock(&sht21->lock);
+
+       return ret >= 0 ? 0 : ret;
+}
+
+/**
+ * sht21_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 sht21_show_temperature(struct device *dev,
+       struct device_attribute *attr,
+       char *buf)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct sht21 *sht21 = i2c_get_clientdata(client);
+       int ret = sht21_update_measurements(client);
+       if (ret < 0)
+               return ret;
+       return sprintf(buf, "%d\n", sht21->temperature);
+}
+
+/**
+ * sht21_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 sht21_show_humidity(struct device *dev,
+       struct device_attribute *attr,
+       char *buf)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct sht21 *sht21 = i2c_get_clientdata(client);
+       int ret = sht21_update_measurements(client);
+       if (ret < 0)
+               return ret;
+       return sprintf(buf, "%d\n", sht21->humidity);
+}
+
+/* sysfs attributes */
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, sht21_show_temperature,
+       NULL, 0);
+static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, sht21_show_humidity,
+       NULL, 0);
+
+static struct attribute *sht21_attributes[] = {
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_humidity1_input.dev_attr.attr,
+       NULL
+};
+
+static const struct attribute_group sht21_attr_group = {
+       .attrs = sht21_attributes,
+};
+
+/**
+ * sht21_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 sht21_probe(struct i2c_client *client,
+       const struct i2c_device_id *id)
+{
+       struct sht21 *sht21;
+       int err;
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_WORD_DATA)) {
+               dev_err(&client->dev,
+                       "adapter does not support SMBus word transactions\n");
+               return -ENODEV;
+       }
+
+       sht21 = kzalloc(sizeof(*sht21), GFP_KERNEL);
+       if (!sht21) {
+               dev_dbg(&client->dev, "kzalloc failed\n");
+               return -ENOMEM;
+       }
+       i2c_set_clientdata(client, sht21);
+
+       mutex_init(&sht21->lock);
+
+       err = sysfs_create_group(&client->dev.kobj, &sht21_attr_group);
+       if (err) {
+               dev_dbg(&client->dev, "could not create sysfs files\n");
+               goto fail_free;
+       }
+       sht21->hwmon_dev = hwmon_device_register(&client->dev);
+       if (IS_ERR(sht21->hwmon_dev)) {
+               dev_dbg(&client->dev, "unable to register hwmon device\n");
+               err = PTR_ERR(sht21->hwmon_dev);
+               goto fail_remove_sysfs;
+       }
+
+       dev_info(&client->dev, "initialized\n");
+
+       return 0;
+
+fail_remove_sysfs:
+       sysfs_remove_group(&client->dev.kobj, &sht21_attr_group);
+fail_free:
+       kfree(sht21);
+
+       return err;
+}
+
+/**
+ * sht21_remove() - remove device
+ * @client: I2C client device
+ */
+static int __devexit sht21_remove(struct i2c_client *client)
+{
+       struct sht21 *sht21 = i2c_get_clientdata(client);
+
+       hwmon_device_unregister(sht21->hwmon_dev);
+       sysfs_remove_group(&client->dev.kobj, &sht21_attr_group);
+       kfree(sht21);
+
+       return 0;
+}
+
+/* Device ID table */
+static const struct i2c_device_id sht21_id[] = {
+       { "sht21", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, sht21_id);
+
+static struct i2c_driver sht21_driver = {
+       .driver.name = "sht21",
+       .probe       = sht21_probe,
+       .remove      = __devexit_p(sht21_remove),
+       .id_table    = sht21_id,
+};
+
+/**
+ * sht21_init() - initialize driver
+ *
+ * Called when kernel is booted or module is inserted.
+ * Returns 0 on success.
+ */
+static int __init sht21_init(void)
+{
+       return i2c_add_driver(&sht21_driver);
+}
+module_init(sht21_init);
+
+/**
+ * sht21_init() - clean up driver
+ *
+ * Called when module is removed.
+ */
+static void __exit sht21_exit(void)
+{
+       i2c_del_driver(&sht21_driver);
+}
+module_exit(sht21_exit);
+
+MODULE_AUTHOR("Urs Fleisch <urs.fleisch@sensirion.com>");
+MODULE_DESCRIPTION("Sensirion SHT21 humidity and temperature sensor driver");
+MODULE_LICENSE("GPL");