IOFBCopyI2CInterfaceForBus
Returns an instance of an I2C bus interface, associated with an IOFramebuffer instance / bus index pair.
Declaration
IOReturn IOFBCopyI2CInterfaceForBus(io_service_t framebuffer, IOOptionBits bus, io_service_t *interface);Parameters
- bus:
The zero based index of the bus on the requested framebuffer.
- interface:
The interface instance is returned. The caller should release this instance with IOObjectRelease().
Return Value
An IOReturn code.
Discussion
Some graphics devices will allow access to an I2C bus routed through a display connector in order to control external devices on that bus. This function returns an instance of an I2C bus interface, associated with an IOFramebuffer instance / bus index pair. The number of I2C buses is available from the IOFBGetI2CInterfaceCount() call. The interface may be used with the IOI2CInterfaceOpen/Close/SendRequest() calls to carry out I2C transactions on that bus. Not all graphics devices support this functionality.