[PATCH 1/2] ALSA: hda/hdmi: Add helper function to check if a device is HDMI codec

[Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>]

The snd_hda_device_is_hdmi() can be used in drivers to check if the hdev
belongs to a display audio device.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
---
 include/sound/hdaudio.h    | 10 ++++++++++
 sound/pci/hda/patch_hdmi.c | 13 +++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index dd7c87bbc613..cf5483d6b5b7 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -158,6 +158,16 @@ bool snd_hdac_check_power_state(struct hdac_device *hdac,
 		hda_nid_t nid, unsigned int target_state);
 unsigned int snd_hdac_sync_power_state(struct hdac_device *hdac,
 		      hda_nid_t nid, unsigned int target_state);
+
+#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
+bool snd_hda_device_is_hdmi(struct hdac_device *hdev);
+#else
+static inline bool snd_hda_device_is_hdmi(struct hdac_device *hdev)
+{
+	return false;
+}
+#endif
+
 /**
  * snd_hdac_read_parm - read a codec parameter
  * @codec: the codec object
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 1cde2a69bdb4..d6943575c8c7 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -4645,6 +4645,19 @@ HDA_CODEC_ENTRY(HDA_CODEC_ID_GENERIC_HDMI, "Generic HDMI", patch_generic_hdmi),
 };
 MODULE_DEVICE_TABLE(hdaudio, snd_hda_id_hdmi);
 
+bool snd_hda_device_is_hdmi(struct hdac_device *hdev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(snd_hda_id_hdmi); i++) {
+		if (snd_hda_id_hdmi[i].vendor_id == hdev->vendor_id)
+			return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(snd_hda_device_is_hdmi);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("HDMI HD-audio codec");
 MODULE_ALIAS("snd-hda-codec-intelhdmi");
-- 
2.43.0