Kernel driver max6650 ===================== Supported chips: * Maxim 6650 / 6651 Prefix: 'max6650' Addresses scanned: I2C 0x1b, 0x1f, 0x48, 0x4b Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf Authors: Hans J. Koch <hjk@linutronix.de> John Morris <john.morris@spirentcom.com> Claus Gindhart <claus.gindhart@kontron.com> Description ----------- This driver implements support for the Maxim 6650/6651 The 2 devices are very similar, but the Maxim 6550 has a reduced feature set, e.g. only one fan-input, instead of 4 for the 6651. The driver is not able to distinguish between the 2 devices. The driver provides the following sensor accesses in sysfs: fan1_input ro fan tachometer speed in RPM fan2_input ro " fan3_input ro " fan4_input ro " fan1_target rw desired fan speed in RPM (closed loop mode only) pwm1_enable rw regulator mode, 0=full on, 1=open loop, 2=closed loop pwm1 rw relative speed (0-255), 255=max. speed. Used in open loop mode only. fan1_div rw sets the speed range the inputs can handle. Legal values are 1, 2, 4, and 8. Use lower values for faster fans. Module parameters ----------------- If your board has a BIOS that initializes the MAX6650/6651 correctly, you can simply load your module without parameters. It won't touch the configuration registers then. If your board BIOS doesn't initialize the chip, or you want different settings, you can set the following parameters: voltage_12V: 5=5V fan, 12=12V fan, 0=don't change prescaler: Possible values are 1,2,4,8,16, or 0 for don't change clock: The clock frequency in Hz of the chip the driver should assume [254000] Please have a look at the MAX6650/6651 data sheet and make sure that you fully understand the meaning of these parameters before you attempt to change them.