Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/Documentation/hwmon/sht3x.rst b/Documentation/hwmon/sht3x.rst
new file mode 100644
index 000000000..95a850d5b
--- /dev/null
+++ b/Documentation/hwmon/sht3x.rst
@@ -0,0 +1,88 @@
+Kernel driver sht3x
+===================
+
+Supported chips:
+
+  * Sensirion SHT3x-DIS
+
+    Prefix: 'sht3x'
+
+    Addresses scanned: none
+
+    Datasheet: https://www.sensirion.com/file/datasheet_sht3x_digital
+
+Author:
+
+  - David Frey <david.frey@sensirion.com>
+  - Pascal Sachs <pascal.sachs@sensirion.com>
+
+Description
+-----------
+
+This driver implements support for the Sensirion SHT3x-DIS chip, a humidity
+and temperature sensor. Temperature is measured in degrees celsius, relative
+humidity is expressed as a percentage. In the sysfs interface, all values are
+scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500.
+
+The device communicates with the I2C protocol. Sensors can have the I2C
+addresses 0x44 or 0x45, depending on the wiring. See
+Documentation/i2c/instantiating-devices.rst for methods to instantiate the device.
+
+There are two options configurable by means of sht3x_platform_data:
+
+1. blocking (pull the I2C clock line down while performing the measurement) or
+   non-blocking mode. Blocking mode will guarantee the fastest result but
+   the I2C bus will be busy during that time. By default, non-blocking mode
+   is used. Make sure clock-stretching works properly on your device if you
+   want to use blocking mode.
+2. high or low accuracy. High accuracy is used by default and using it is
+   strongly recommended.
+
+The sht3x sensor supports a single shot mode as well as 5 periodic measure
+modes, which can be controlled with the update_interval sysfs interface.
+The allowed update_interval in milliseconds are as follows:
+
+    ===== ======= ====================
+       0          single shot mode
+    2000   0.5 Hz periodic measurement
+    1000   1   Hz periodic measurement
+     500   2   Hz periodic measurement
+     250   4   Hz periodic measurement
+     100  10   Hz periodic measurement
+    ===== ======= ====================
+
+In the periodic measure mode, the sensor automatically triggers a measurement
+with the configured update interval on the chip. When a temperature or humidity
+reading exceeds the configured limits, the alert attribute is set to 1 and
+the alert pin on the sensor is set to high.
+When the temperature and humidity readings move back between the hysteresis
+values, the alert bit is set to 0 and the alert pin on the sensor is set to
+low.
+
+sysfs-Interface
+---------------
+
+=================== ============================================================
+temp1_input:        temperature input
+humidity1_input:    humidity input
+temp1_max:          temperature max value
+temp1_max_hyst:     temperature hysteresis value for max limit
+humidity1_max:      humidity max value
+humidity1_max_hyst: humidity hysteresis value for max limit
+temp1_min:          temperature min value
+temp1_min_hyst:     temperature hysteresis value for min limit
+humidity1_min:      humidity min value
+humidity1_min_hyst: humidity hysteresis value for min limit
+temp1_alarm:        alarm flag is set to 1 if the temperature is outside the
+		    configured limits. Alarm only works in periodic measure mode
+humidity1_alarm:    alarm flag is set to 1 if the humidity is outside the
+		    configured limits. Alarm only works in periodic measure mode
+heater_enable:      heater enable, heating element removes excess humidity from
+		    sensor:
+
+			- 0: turned off
+			- 1: turned on
+update_interval:    update interval, 0 for single shot, interval in msec
+		    for periodic measurement. If the interval is not supported
+		    by the sensor, the next faster interval is chosen
+=================== ============================================================