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- Kernel driver max6650
- =====================
- Supported chips:
- * Maxim MAX6650
- Prefix: 'max6650'
- Addresses scanned: none
- Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
- * Maxim MAX6651
- Prefix: 'max6651'
- Addresses scanned: none
- Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
- Authors:
- Hans J. Koch <hjk@hansjkoch.de>
- John Morris <john.morris@spirentcom.com>
- Claus Gindhart <claus.gindhart@kontron.com>
- Description
- -----------
- This driver implements support for the Maxim MAX6650 and MAX6651.
- The 2 devices are very similar, but the MAX6550 has a reduced feature
- set, e.g. only one fan-input, instead of 4 for the MAX6651.
- 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
- 3=off
- 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.
- Usage notes
- -----------
- This driver does not auto-detect devices. You will have to instantiate the
- devices explicitly. Please see Documentation/i2c/instantiating-devices for
- details.
- 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.
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