1.. SPDX-License-Identifier: GPL-2.0 2 3Kernel driver emc2305 4===================== 5 6Supported chips: 7 Microchip EMC2305, EMC2303, EMC2302, EMC2301 8 9 Prefixes: 'emc2305' 10 11 Datasheet: Publicly available at the Microchip website : 12 https://www.microchip.com/en-us/product/EMC2305 13 14Description: 15------------ 16This driver implements support for Microchip EMC2301/2/3/5 RPM-based PWM Fan Controller. 17The EMC2305 Fan Controller supports up to 5 independently controlled PWM fan drives. 18Fan rotation speeds are reported in RPM. 19The driver supports the RPM-based PWM control to keep a fan at the desired speed. 20The driver provides the possibility to have one common PWM interface for all FANs 21or up to the maximum available or configured independent PWMs. 22 23The driver provides the following sysfs interfaces in hwmon subsystem: 24 25================= == =================================================== 26fan[1-5]_fault RO files for tachometers TACH1-TACH5 fault indication 27fan[1-5]_input RO files for tachometers TACH1-TACH5 input (in RPM) 28pwm[1-5] RW file for fan[1-5] target duty cycle (0..255) 29================= == =================================================== 30 31sysfs interfaces in thermal subsystem: 32 33================= == ======================================================================== 34cur_state RW file for the current cooling state of the cooling device (0..max_state) 35max_state RO file for the maximum cooling state of the cooling device 36================= == ======================================================================== 37