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NetBSD 6.1.5 - man page for acpismbus (netbsd section 4)

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ACPISMBUS(4)			   BSD Kernel Interfaces Manual 		     ACPISMBUS(4)

NAME
     acpismbus -- ACPI SMBus Control Method Interface

SYNOPSIS
     acpismbus* at acpi?
     iic* at acpismbus?

DESCRIPTION
     The acpismbus driver supports instances of the ACPI SMBus Control Method Interface.  This
     enables i2c access to bus segments which might not otherwise be accessible due to missing
     "native" driver support.  The SMBus Process Call protocol is not supported.  All other SMBus
     protocols are supported to the extent that the underlying controller supports them.

SEE ALSO
     acpi(4), iic(4)

HISTORY
     The acpismbus driver appeared in NetBSD 6.0.

BUGS
     Although acpismbus SMBus Alerts can be associated with individual devices, this capability
     is ignored.  When an acpismbus SMBus Alert is generated, all devices on the i2c bus segment
     which have registered an interrupt routine are notified.

     The SMBus CMI protocol defines a method to provide a list of devices on an i2c bus segment
     and their addresses.  The acpismbus driver makes no attempt to retrieve or process this
     device list.

     There is currently no way to determine if the i2c controller managed by an instance of the
     ACPI SMBus CMI can also be accessed using a native device driver.	Therefore, the acpismbus
     driver should not be enabled by default.  If both a native driver and the acpismbus driver
     attempt to access the same i2c bus segment, the results are undefined.

BSD					 February 6, 2010				      BSD
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