1 Kernel driver sch5627 2 ===================== 3 4 Supported chips: 5 6 * SMSC SCH5627 7 8 Prefix: 'sch5627' 9 10 Addresses scanned: none, address read from Super I/O config space 11 12 Datasheet: Application Note available upon request 13 14 Author: Hans de Goede <hdegoede@redhat.com> 15 16 17 Description 18 ----------- 19 20 SMSC SCH5627 Super I/O chips include complete hardware monitoring 21 capabilities. They can monitor up to 5 voltages, 4 fans and 8 temperatures. 22 23 In addition, the SCH5627 exports data describing which temperature sensors 24 affect the speed of each fan. Setting pwmX_auto_channels_temp to 0 forces 25 the corresponding fan to full speed until another value is written. 26 27 The SMSC SCH5627 hardware monitoring part also contains an integrated 28 watchdog. In order for this watchdog to function some motherboard specific 29 initialization most be done by the BIOS, so if the watchdog is not enabled 30 by the BIOS the sch5627 driver will not register a watchdog device. 31 32 The hardware monitoring part of the SMSC SCH5627 is accessed by talking 33 through an embedded microcontroller. An application note describing the 34 protocol for communicating with the microcontroller is available upon 35 request. Please mail me if you want a copy. 36 37 38 Controlling fan speed 39 --------------------- 40 41 The SCH5627 allows for partially controlling the fan speed. If a temperature 42 channel excedes tempX_max, all fans are forced to maximum speed. The same is not 43 true for tempX_crit, presumably some other measures to cool down the system are 44 take in this case. 45 In which way the value of fanX_min affects the fan speed is currently unknown.
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