1*505c2549SNavin Sankar Velliangiri.. SPDX-License-Identifier: GPL-2.0 2*505c2549SNavin Sankar Velliangiri 3*505c2549SNavin Sankar VelliangiriKernel driver sht4x 4*505c2549SNavin Sankar Velliangiri=================== 5*505c2549SNavin Sankar Velliangiri 6*505c2549SNavin Sankar VelliangiriSupported Chips: 7*505c2549SNavin Sankar Velliangiri 8*505c2549SNavin Sankar Velliangiri * Sensirion SHT4X 9*505c2549SNavin Sankar Velliangiri 10*505c2549SNavin Sankar Velliangiri Prefix: 'sht4x' 11*505c2549SNavin Sankar Velliangiri 12*505c2549SNavin Sankar Velliangiri Addresses scanned: None 13*505c2549SNavin Sankar Velliangiri 14*505c2549SNavin Sankar Velliangiri Datasheet: 15*505c2549SNavin Sankar Velliangiri 16*505c2549SNavin Sankar Velliangiri English: https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Datasheets/Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf 17*505c2549SNavin Sankar Velliangiri 18*505c2549SNavin Sankar VelliangiriAuthor: Navin Sankar Velliangiri <navin@linumiz.com> 19*505c2549SNavin Sankar Velliangiri 20*505c2549SNavin Sankar Velliangiri 21*505c2549SNavin Sankar VelliangiriDescription 22*505c2549SNavin Sankar Velliangiri----------- 23*505c2549SNavin Sankar Velliangiri 24*505c2549SNavin Sankar VelliangiriThis driver implements support for the Sensirion SHT4x chip, a humidity 25*505c2549SNavin Sankar Velliangiriand temperature sensor. Temperature is measured in degree celsius, relative 26*505c2549SNavin Sankar Velliangirihumidity is expressed as a percentage. In sysfs interface, all values are 27*505c2549SNavin Sankar Velliangiriscaled by 1000, i.e. the value for 31.5 degrees celsius is 31500. 28*505c2549SNavin Sankar Velliangiri 29*505c2549SNavin Sankar VelliangiriUsage Notes 30*505c2549SNavin Sankar Velliangiri----------- 31*505c2549SNavin Sankar Velliangiri 32*505c2549SNavin Sankar VelliangiriThe device communicates with the I2C protocol. Sensors can have the I2C 33*505c2549SNavin Sankar Velliangiriaddress 0x44. See Documentation/i2c/instantiating-devices.rst for methods 34*505c2549SNavin Sankar Velliangirito instantiate the device. 35*505c2549SNavin Sankar Velliangiri 36*505c2549SNavin Sankar VelliangiriSysfs entries 37*505c2549SNavin Sankar Velliangiri------------- 38*505c2549SNavin Sankar Velliangiri 39*505c2549SNavin Sankar Velliangiri=============== ============================================ 40*505c2549SNavin Sankar Velliangiritemp1_input Measured temperature in millidegrees Celcius 41*505c2549SNavin Sankar Velliangirihumidity1_input Measured humidity in %H 42*505c2549SNavin Sankar Velliangiriupdate_interval The minimum interval for polling the sensor, 43*505c2549SNavin Sankar Velliangiri in milliseconds. Writable. Must be at least 44*505c2549SNavin Sankar Velliangiri 2000. 45*505c2549SNavin Sankar Velliangiri============== ============================================= 46