ALSA: hda - handle multiple i915 device instances

}

EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);

/**

 * Returns true if the devices can be connected for audio.

 */

static bool connectivity_check(struct pci_dev *i915, struct pci_dev *hdac)

{

	struct pci_bus *bus_a = i915->bus, *bus_b = hdac->bus;

	/* directly connected on the same bus */

	if (bus_a == bus_b)

		return true;

	/*

	 * on i915 discrete GPUs with embedded HDA audio, the two

	 * devices are connected via 2nd level PCI bridge

	 */

	bus_a = bus_a->parent;

	bus_b = bus_b->parent;

	if (!bus_a || !bus_b)

		return false;

	bus_a = bus_a->parent;

	bus_b = bus_b->parent;

	if (bus_a && bus_a == bus_b)

		return true;

	return false;

}

static int i915_component_master_match(struct device *dev, int subcomponent,

				       void *data)

{

	return !strcmp(dev->driver->name, "i915") &&

	       subcomponent == I915_COMPONENT_AUDIO;

	struct pci_dev *hdac_pci, *i915_pci;

	struct hdac_bus *bus = data;

	if (!dev_is_pci(dev))

		return 0;

	hdac_pci = to_pci_dev(bus->dev);

	i915_pci = to_pci_dev(dev);

	if (!strcmp(dev->driver->name, "i915") &&

	    subcomponent == I915_COMPONENT_AUDIO &&

	    connectivity_check(i915_pci, hdac_pci))

		return 1;

	return 0;

}

/* check whether intel graphics is present */