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Frodo Looijaard
846845204d
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@738 7894878c-1315-0410-8ee3-d5d059ff63e0
106 lines
2.9 KiB
Plaintext
106 lines
2.9 KiB
Plaintext
WARNING: THE CURRENT DRIVER SIMPLY DOES NOT WORK. DO NOT USE.
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ICSPLL Driver
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-------------
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This is a clock chip reader.
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It requires an SMBus interface chip and a clock chip
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which supports SMBus block reads.
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Stability
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---------
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*** ALPHA - It may hang your SMBus or crash your entire system. ***
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*** Using this driver with an unsupported chip or configuration ***
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*** is even more likely to hang your SMBus or crash your system. ***
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AUTODETECTION
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-------------
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None is possible, these chips do not have ID registers.
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Read the full part number on your clock chip and read this
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documentation before insmod'ing the icspll module.
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CHIPS SUPPORTED
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---------------
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This driver will only work on clock chips that support the SMBus
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block read, which includes a length byte.
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The clock chip must be at address 0x69.
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According to ICS, this includes the following chips:
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ICS9148-xx (xx > 20) with a serial interface
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ICS9248-xx (all xx) with a serial interface
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Other ICS chips DO NOT support SMBus block reads.
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Not all 9148/9248 ICS chips have a serial interface.
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See http://www.icst.com to get the data sheet for your clock
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chip.
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You must have a piix4 or a ali15x3 chip to have this work.
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Other bridge chips like the via support I2C
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but not SMBus-style block reads.
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Writes are not supported.
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Partial list of supported chips:
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ICS:
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9148-32, 9248-81
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PLL:
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none?
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CHIPS NOT SUPPORTED
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-------------------
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Other ICS chips and PhaseLink Labs (PLL) chips ( http://www.phaselink.com )
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have an I2C serial interface that is not compatible
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with SMBus block reads because they do not output a length byte.
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However because of a lack of block read support in the I2C package,
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this driver won't work with native I2C systems (like the via)
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at the moment.
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There may be some PLL chips that support the SMBus length byte,
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who knows.
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These chips are compatible with SMBus writes which is why
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motherboard designers put them on the SMBus, so that the BIOS
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can configure them.
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But this driver will not support write-only chips.
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Partial list of unsupported chips:
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ICS:
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9148-02, 9148B-04, 9148-08, 9150-01, 9150-04, 9150-11
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PLL:
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52C64-05, 52C64-25, 52C65-02, 52C66-01, 52C66-03, 52C66-10,
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52C66-11, 52C66-28, 52C66-29, 52C66-31, 52C66-38, 52C66-39,
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52C68-02, 52C68-04, 52C69-13, 52C69-15
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/PROC ENTRY
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-----------
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These chips have up to 7 registers.
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They will appear as 7 decimal values when you cat
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/proc/sys/dev/sensors/icspll-i2c-*-69/reg0-6.
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RESULTS
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-------
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If you try this on a supported configuration,
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please report your clock chip, your SMBus chip
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(piix4 or ali15x3), and the results of
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'cat /proc/sys/dev/sensors/icspll-i2c-*-69/reg0-6' to
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sensors@stimpy.netroedge.com.
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TO DO
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-----
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Add a chip= parameter so that you know what chip it is.
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Put more entries in /proc for the individual fields in the registers.
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Native I2C support.
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Writes?
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Author/Maintainer
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-----------------
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Mark D. Studebaker (mdsxyz123@yahoo.com)
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