Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

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 

    John Morris 

    Claus Gindhart 

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.