1505c2549SNavin Sankar Velliangiri.. SPDX-License-Identifier: GPL-2.0 2505c2549SNavin Sankar Velliangiri 3505c2549SNavin Sankar VelliangiriKernel driver sht4x 4505c2549SNavin Sankar Velliangiri=================== 5505c2549SNavin Sankar Velliangiri 6505c2549SNavin Sankar VelliangiriSupported Chips: 7505c2549SNavin Sankar Velliangiri 8505c2549SNavin Sankar Velliangiri * Sensirion SHT4X 9505c2549SNavin Sankar Velliangiri 10505c2549SNavin Sankar Velliangiri Prefix: 'sht4x' 11505c2549SNavin Sankar Velliangiri 12505c2549SNavin Sankar Velliangiri Addresses scanned: None 13505c2549SNavin Sankar Velliangiri 14505c2549SNavin Sankar Velliangiri Datasheet: 15505c2549SNavin Sankar Velliangiri 16505c2549SNavin Sankar Velliangiri English: https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Datasheets/Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf 17505c2549SNavin Sankar Velliangiri 18505c2549SNavin Sankar VelliangiriAuthor: Navin Sankar Velliangiri <navin@linumiz.com> 19505c2549SNavin Sankar Velliangiri 20505c2549SNavin Sankar Velliangiri 21505c2549SNavin Sankar VelliangiriDescription 22505c2549SNavin Sankar Velliangiri----------- 23505c2549SNavin Sankar Velliangiri 24505c2549SNavin Sankar VelliangiriThis driver implements support for the Sensirion SHT4x chip, a humidity 25505c2549SNavin Sankar Velliangiriand temperature sensor. Temperature is measured in degree celsius, relative 26505c2549SNavin Sankar Velliangirihumidity is expressed as a percentage. In sysfs interface, all values are 27505c2549SNavin Sankar Velliangiriscaled by 1000, i.e. the value for 31.5 degrees celsius is 31500. 28505c2549SNavin Sankar Velliangiri 29505c2549SNavin Sankar VelliangiriUsage Notes 30505c2549SNavin Sankar Velliangiri----------- 31505c2549SNavin Sankar Velliangiri 32505c2549SNavin Sankar VelliangiriThe device communicates with the I2C protocol. Sensors can have the I2C 33505c2549SNavin Sankar Velliangiriaddress 0x44. See Documentation/i2c/instantiating-devices.rst for methods 34505c2549SNavin Sankar Velliangirito instantiate the device. 35505c2549SNavin Sankar Velliangiri 36505c2549SNavin Sankar VelliangiriSysfs entries 37505c2549SNavin Sankar Velliangiri------------- 38505c2549SNavin Sankar Velliangiri 39505c2549SNavin Sankar Velliangiri=============== ============================================ 40*12087a36SRandy Dunlaptemp1_input Measured temperature in millidegrees Celsius 41505c2549SNavin Sankar Velliangirihumidity1_input Measured humidity in %H 42505c2549SNavin Sankar Velliangiriupdate_interval The minimum interval for polling the sensor, 43505c2549SNavin Sankar Velliangiri in milliseconds. Writable. Must be at least 44505c2549SNavin Sankar Velliangiri 2000. 45505c2549SNavin Sankar Velliangiri=============== ============================================ 46