ALSA: hda - Move audio component accesses to hdac_i915.c

A couple of i915_audio_component ops have been added and accessed
directly from patch_hdmi.c.  Ideally all these should be factored out
into hdac_i915.c.

This patch does it, adds two new helper functions for setting N/CTS
and fetching ELD bytes.  One bonus is that the hackish widget vs port
mapping is also moved to hdac_i915.c, so that it can be fixed /
enhanced more cleanly.

Reviewed-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hda_i915.h

@@ -10,6 +10,9 @@
 int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable);
 int snd_hdac_display_power(struct hdac_bus *bus, bool enable);
 int snd_hdac_get_display_clk(struct hdac_bus *bus);
+int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate);
+int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
+			   bool *audio_enabled, char *buffer, int max_bytes);
 int snd_hdac_i915_init(struct hdac_bus *bus);
 int snd_hdac_i915_exit(struct hdac_bus *bus);
 int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *);
@@ -26,6 +29,17 @@ static inline int snd_hdac_get_display_clk(struct hdac_bus *bus)
 {
 	return 0;
 }
+static inline int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid,
+					   int rate)
+{
+	return 0;
+}
+static inline int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
+					 bool *audio_enabled, char *buffer,
+					 int max_bytes)
+{
+	return -ENODEV;
+}
 static inline int snd_hdac_i915_init(struct hdac_bus *bus)
 {
 	return -ENODEV;

sound/hda/hdac_i915.c

@@ -118,6 +118,72 @@ int snd_hdac_get_display_clk(struct hdac_bus *bus)
 }
 EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk);
 
+/* There is a fixed mapping between audio pin node and display port
+ * on current Intel platforms:
+ * Pin Widget 5 - PORT B (port = 1 in i915 driver)
+ * Pin Widget 6 - PORT C (port = 2 in i915 driver)
+ * Pin Widget 7 - PORT D (port = 3 in i915 driver)
+ */
+static int pin2port(hda_nid_t pin_nid)
+{
+	return pin_nid - 4;
+}
+
+/**
+ * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
+ * @bus: HDA core bus
+ * @nid: the pin widget NID
+ * @rate: the sample rate to set
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function sets N/CTS value based on the given sample rate.
+ * Returns zero for success, or a negative error code.
+ */
+int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate)
+{
+	struct i915_audio_component *acomp = bus->audio_component;
+
+	if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
+		return -ENODEV;
+	return acomp->ops->sync_audio_rate(acomp->dev, pin2port(nid), rate);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
+
+/**
+ * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
+ * @bus: HDA core bus
+ * @nid: the pin widget NID
+ * @audio_enabled: the pointer to store the current audio state
+ * @buffer: the buffer pointer to store ELD bytes
+ * @max_bytes: the max bytes to be stored on @buffer
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function queries the current state of the audio on the given
+ * digital port and fetches the ELD bytes onto the given buffer.
+ * It returns the number of bytes for the total ELD data, zero for
+ * invalid ELD, or a negative error code.
+ *
+ * The return size is the total bytes required for the whole ELD bytes,
+ * thus it may be over @max_bytes.  If it's over @max_bytes, it implies
+ * that only a part of ELD bytes have been fetched.
+ */
+int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
+			   bool *audio_enabled, char *buffer, int max_bytes)
+{
+	struct i915_audio_component *acomp = bus->audio_component;
+
+	if (!acomp || !acomp->ops || !acomp->ops->get_eld)
+		return -ENODEV;
+
+	return acomp->ops->get_eld(acomp->dev, pin2port(nid), audio_enabled,
+				   buffer, max_bytes);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
+
 static int hdac_component_master_bind(struct device *dev)
 {
 	struct i915_audio_component *acomp = hdac_acomp;

sound/pci/hda/patch_hdmi.c

@@ -1443,17 +1443,6 @@ static void intel_not_share_assigned_cvt(struct hda_codec *codec,
 	}
 }
 
-/* There is a fixed mapping between audio pin node and display port
- * on current Intel platforms:
- * Pin Widget 5 - PORT B (port = 1 in i915 driver)
- * Pin Widget 6 - PORT C (port = 2 in i915 driver)
- * Pin Widget 7 - PORT D (port = 3 in i915 driver)
- */
-static int intel_pin2port(hda_nid_t pin_nid)
-{
-	return pin_nid - 4;
-}
-
 /*
  * HDA PCM callbacks
  */
@@ -1668,38 +1657,36 @@ static bool hdmi_present_sense_via_verbs(struct hdmi_spec_per_pin *per_pin,
 static void sync_eld_via_acomp(struct hda_codec *codec,
 			       struct hdmi_spec_per_pin *per_pin)
 {
-	struct i915_audio_component *acomp = codec->bus->core.audio_component;
 	struct hdmi_spec *spec = codec->spec;
 	struct hdmi_eld *eld = &spec->temp_eld;
 	int size;
 
-	if (acomp && acomp->ops && acomp->ops->get_eld) {
-		mutex_lock(&per_pin->lock);
-		size = acomp->ops->get_eld(acomp->dev,
-					   intel_pin2port(per_pin->pin_nid),
-					   &eld->monitor_present,
-					   eld->eld_buffer,
-					   ELD_MAX_SIZE);
-		if (size > 0) {
-			size = min(size, ELD_MAX_SIZE);
-			if (snd_hdmi_parse_eld(codec, &eld->info,
-					       eld->eld_buffer, size) < 0)
-				size = -EINVAL;
-		}
-
-		if (size > 0) {
-			eld->eld_valid = true;
-			eld->eld_size = size;
-		} else {
-			eld->eld_valid = false;
-			eld->eld_size = 0;
-		}
-
-		update_eld(codec, per_pin, eld);
-		snd_jack_report(per_pin->acomp_jack,
-				eld->monitor_present ? SND_JACK_AVOUT : 0);
-		mutex_unlock(&per_pin->lock);
+	mutex_lock(&per_pin->lock);
+	size = snd_hdac_acomp_get_eld(&codec->bus->core, per_pin->pin_nid,
+				      &eld->monitor_present, eld->eld_buffer,
+				      ELD_MAX_SIZE);
+	if (size < 0)
+		goto unlock;
+	if (size > 0) {
+		size = min(size, ELD_MAX_SIZE);
+		if (snd_hdmi_parse_eld(codec, &eld->info,
+				       eld->eld_buffer, size) < 0)
+			size = -EINVAL;
+	}
+
+	if (size > 0) {
+		eld->eld_valid = true;
+		eld->eld_size = size;
+	} else {
+		eld->eld_valid = false;
+		eld->eld_size = 0;
 	}
+
+	update_eld(codec, per_pin, eld);
+	snd_jack_report(per_pin->acomp_jack,
+			eld->monitor_present ? SND_JACK_AVOUT : 0);
+ unlock:
+	mutex_unlock(&per_pin->lock);
 }
 
 static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
@@ -1865,7 +1852,6 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 	struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
 	hda_nid_t pin_nid = per_pin->pin_nid;
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct i915_audio_component *acomp = codec->bus->core.audio_component;
 	bool non_pcm;
 	int pinctl;
 
@@ -1884,10 +1870,7 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 
 	/* Call sync_audio_rate to set the N/CTS/M manually if necessary */
 	/* Todo: add DP1.2 MST audio support later */
-	if (acomp && acomp->ops && acomp->ops->sync_audio_rate)
-		acomp->ops->sync_audio_rate(acomp->dev,
-				intel_pin2port(pin_nid),
-				runtime->rate);
+	snd_hdac_sync_audio_rate(&codec->bus->core, pin_nid, runtime->rate);
 
 	non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
 	mutex_lock(&per_pin->lock);