Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver max6650 2 ===================== 3 4 Supported chips: 5 * Maxim MAX6650 6 Prefix: 'max6650' 7 Addresses scanned: none 8 Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf 9 * Maxim MAX6651 10 Prefix: 'max6651' 11 Addresses scanned: none 12 Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf 13 14 Authors: 15 Hans J. Koch <hjk@hansjkoch.de> 16 John Morris <john.morris@spirentcom.com> 17 Claus Gindhart <claus.gindhart@kontron.com> 18 19 Description 20 ----------- 21 22 This driver implements support for the Maxim MAX6650 and MAX6651. 23 24 The 2 devices are very similar, but the MAX6550 has a reduced feature 25 set, e.g. only one fan-input, instead of 4 for the MAX6651. 26 27 The driver is not able to distinguish between the 2 devices. 28 29 The driver provides the following sensor accesses in sysfs: 30 31 fan1_input ro fan tachometer speed in RPM 32 fan2_input ro " 33 fan3_input ro " 34 fan4_input ro " 35 fan1_target rw desired fan speed in RPM (closed loop mode only) 36 pwm1_enable rw regulator mode, 0=full on, 1=open loop, 2=closed loop 37 3=off 38 pwm1 rw relative speed (0-255), 255=max. speed. 39 Used in open loop mode only. 40 fan1_div rw sets the speed range the inputs can handle. Legal 41 values are 1, 2, 4, and 8. Use lower values for 42 faster fans. 43 44 Usage notes 45 ----------- 46 47 This driver does not auto-detect devices. You will have to instantiate the 48 devices explicitly. Please see Documentation/i2c/instantiating-devices for 49 details. 50 51 Module parameters 52 ----------------- 53 54 If your board has a BIOS that initializes the MAX6650/6651 correctly, you can 55 simply load your module without parameters. It won't touch the configuration 56 registers then. If your board BIOS doesn't initialize the chip, or you want 57 different settings, you can set the following parameters: 58 59 voltage_12V: 5=5V fan, 12=12V fan, 0=don't change 60 prescaler: Possible values are 1,2,4,8,16, or 0 for don't change 61 clock: The clock frequency in Hz of the chip the driver should assume [254000] 62 63 Please have a look at the MAX6650/6651 data sheet and make sure that you fully 64 understand the meaning of these parameters before you attempt to change them.