Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver amc6821 2 ===================== 3 4 Supported chips: 5 Texas Instruments AMC6821 6 Prefix: 'amc6821' 7 Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e 8 Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html 9 10 Authors: 11 Tomaz Mertelj <tomaz.mertelj@guest.arnes.si> 12 13 14 Description 15 ----------- 16 17 This driver implements support for the Texas Instruments amc6821 chip. 18 The chip has one on-chip and one remote temperature sensor and one pwm fan 19 regulator. 20 The pwm can be controlled either from software or automatically. 21 22 The driver provides the following sensor accesses in sysfs: 23 24 temp1_input ro on-chip temperature 25 temp1_min rw " 26 temp1_max rw " 27 temp1_crit rw " 28 temp1_min_alarm ro " 29 temp1_max_alarm ro " 30 temp1_crit_alarm ro " 31 32 temp2_input ro remote temperature 33 temp2_min rw " 34 temp2_max rw " 35 temp2_crit rw " 36 temp2_min_alarm ro " 37 temp2_max_alarm ro " 38 temp2_crit_alarm ro " 39 temp2_fault ro " 40 41 fan1_input ro tachometer speed 42 fan1_min rw " 43 fan1_max rw " 44 fan1_fault ro " 45 fan1_div rw Fan divisor can be either 2 or 4. 46 47 pwm1 rw pwm1 48 pwm1_enable rw regulator mode, 1=open loop, 2=fan controlled 49 by remote temperature, 3=fan controlled by 50 combination of the on-chip temperature and 51 remote-sensor temperature, 52 pwm1_auto_channels_temp ro 1 if pwm_enable==2, 3 if pwm_enable==3 53 pwm1_auto_point1_pwm ro Hardwired to 0, shared for both 54 temperature channels. 55 pwm1_auto_point2_pwm rw This value is shared for both temperature 56 channels. 57 pwm1_auto_point3_pwm rw Hardwired to 255, shared for both 58 temperature channels. 59 60 temp1_auto_point1_temp ro Hardwired to temp2_auto_point1_temp 61 which is rw. Below this temperature fan stops. 62 temp1_auto_point2_temp rw The low-temperature limit of the proportional 63 range. Below this temperature 64 pwm1 = pwm1_auto_point2_pwm. It can go from 65 0 degree C to 124 degree C in steps of 66 4 degree C. Read it out after writing to get 67 the actual value. 68 temp1_auto_point3_temp rw Above this temperature fan runs at maximum 69 speed. It can go from temp1_auto_point2_temp. 70 It can only have certain discrete values 71 which depend on temp1_auto_point2_temp and 72 pwm1_auto_point2_pwm. Read it out after 73 writing to get the actual value. 74 75 temp2_auto_point1_temp rw Must be between 0 degree C and 63 degree C and 76 it defines the passive cooling temperature. 77 Below this temperature the fan stops in 78 the closed loop mode. 79 temp2_auto_point2_temp rw The low-temperature limit of the proportional 80 range. Below this temperature 81 pwm1 = pwm1_auto_point2_pwm. It can go from 82 0 degree C to 124 degree C in steps 83 of 4 degree C. 84 85 temp2_auto_point3_temp rw Above this temperature fan runs at maximum 86 speed. It can only have certain discrete 87 values which depend on temp2_auto_point2_temp 88 and pwm1_auto_point2_pwm. Read it out after 89 writing to get actual value. 90 91 92 Module parameters 93 ----------------- 94 95 If your board has a BIOS that initializes the amc6821 correctly, you should 96 load the module with: init=0. 97 98 If your board BIOS doesn't initialize the chip, or you want 99 different settings, you can set the following parameters: 100 init=1, 101 pwminv: 0 default pwm output, 1 inverts pwm output.