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- .. SPDX-License-Identifier: GPL-2.0
- Kernel driver emc2305
- =====================
- Supported chips:
- Microchip EMC2305, EMC2303, EMC2302, EMC2301
- Addresses scanned: I2C 0x27, 0x2c, 0x2d, 0x2e, 0x2f, 0x4c, 0x4d
- Prefixes: 'emc2305'
- Datasheet: Publicly available at the Microchip website :
- https://www.microchip.com/en-us/product/EMC2305
- Description:
- ------------
- This driver implements support for Microchip EMC2301/2/3/5 RPM-based PWM Fan Controller.
- The EMC2305 Fan Controller supports up to 5 independently controlled PWM fan drives.
- Fan rotation speeds are reported in RPM.
- The driver supports the RPM-based PWM control to keep a fan at the desired speed.
- The driver provides the possibility to have one common PWM interface for all FANs
- or up to the maximum available or configured independent PWMs.
- The driver provides the following sysfs interfaces in hwmon subsystem:
- ================= == ===================================================
- fan[1-5]_fault RO files for tachometers TACH1-TACH5 fault indication
- fan[1-5]_input RO files for tachometers TACH1-TACH5 input (in RPM)
- pwm[1-5] RW file for fan[1-5] target duty cycle (0..255)
- ================= == ===================================================
- sysfs interfaces in thermal subsystem:
- ================= == ========================================================================
- cur_state RW file for the current cooling state of the cooling device (0..max_state)
- max_state RO file for the maximum cooling state of the cooling device
- ================= == ========================================================================
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