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getAttributeForConnection

Generic method to retrieve some attribute of the framebuffer device, specific to one display connection.

Declaration

virtual IOReturn getAttributeForConnection(
 IOIndex connectIndex, 
 IOSelect attribute,
 uintptr_t *value );

Parameters

  • attribute:

    Defines the attribute to be returned. Some defined attributes are:

    kConnectionSupportsHLDDCSense If the framebuffer supports the DDC methods hasDDCConnect() and getDDCBlock() it should return success (and no value) for this attribute.

    kConnectionSupportsLLDDCSense If the framebuffer wishes to make use of IOFramebuffer::doI2CRequest software implementation of I2C it should implement the I2C methods setDDCClock(), setDDCData(), readDDCClock(), readDDCData(), and it should return success (and no value) for this attribute.

  • value:

    Returns the value for the attribute.

Return Value

an IOReturn code.

Overview

IOFramebuffer subclasses may implement this method to allow arbitrary attribute/value pairs to be returned, specific to one display connection.

See Also

Miscellaneous