1 .. SPDX-License-Identifier: GPL-2.0 1 .. SPDX-License-Identifier: GPL-2.0
2 2
3 Kernel driver emc2305 3 Kernel driver emc2305
4 ===================== 4 =====================
5 5
6 Supported chips: 6 Supported chips:
7 Microchip EMC2305, EMC2303, EMC2302, EMC230 7 Microchip EMC2305, EMC2303, EMC2302, EMC2301
8 8
>> 9 Addresses scanned: I2C 0x27, 0x2c, 0x2d, 0x2e, 0x2f, 0x4c, 0x4d
9 Prefixes: 'emc2305' 10 Prefixes: 'emc2305'
10 11
11 Datasheet: Publicly available at the Microc 12 Datasheet: Publicly available at the Microchip website :
12 https://www.microchip.com/en-us/product/ 13 https://www.microchip.com/en-us/product/EMC2305
13 14
14 Description: 15 Description:
15 ------------ 16 ------------
16 This driver implements support for Microchip E 17 This driver implements support for Microchip EMC2301/2/3/5 RPM-based PWM Fan Controller.
17 The EMC2305 Fan Controller supports up to 5 in 18 The EMC2305 Fan Controller supports up to 5 independently controlled PWM fan drives.
18 Fan rotation speeds are reported in RPM. 19 Fan rotation speeds are reported in RPM.
19 The driver supports the RPM-based PWM control 20 The driver supports the RPM-based PWM control to keep a fan at the desired speed.
20 The driver provides the possibility to have on 21 The driver provides the possibility to have one common PWM interface for all FANs
21 or up to the maximum available or configured i 22 or up to the maximum available or configured independent PWMs.
22 23
23 The driver provides the following sysfs interf 24 The driver provides the following sysfs interfaces in hwmon subsystem:
24 25
25 ================= == ========================= 26 ================= == ===================================================
26 fan[1-5]_fault RO files for tachometers TAC 27 fan[1-5]_fault RO files for tachometers TACH1-TACH5 fault indication
27 fan[1-5]_input RO files for tachometers TAC 28 fan[1-5]_input RO files for tachometers TACH1-TACH5 input (in RPM)
28 pwm[1-5] RW file for fan[1-5] target 29 pwm[1-5] RW file for fan[1-5] target duty cycle (0..255)
29 ================= == ========================= 30 ================= == ===================================================
30 31
31 sysfs interfaces in thermal subsystem: 32 sysfs interfaces in thermal subsystem:
32 33
33 ================= == ========================= 34 ================= == ========================================================================
34 cur_state RW file for the current cool 35 cur_state RW file for the current cooling state of the cooling device (0..max_state)
35 max_state RO file for the maximum cool 36 max_state RO file for the maximum cooling state of the cooling device
36 ================= == ========================= 37 ================= == ========================================================================
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