ALSA: hda: Make audio component support more generic

This is the final step for more generic support of DRM audio
component.  The generic audio component code is now moved to its own
file, and the symbols are renamed from snd_hac_i915_* to
snd_hdac_acomp_*, respectively.  The generic code is enabled via the
new kconfig, CONFIG_SND_HDA_COMPONENT, while CONFIG_SND_HDA_I915 is
kept as the super-class.

Along with the split, three new callbacks are added to audio_ops:
pin2port is for providing the conversion between the pin number and
the widget id, and master_bind/master_unbin are called at binding /
unbinding the master component, respectively.  All these are optional,
but used in i915 implementation and also other later implementations.

A note about the new snd_hdac_acomp_init() function: there is a slight
difference between this and the old snd_hdac_i915_init().  The latter
(still) synchronizes with the master component binding, i.e. it
assures that the relevant DRM component gets bound when it returns, or
gives a negative error.  Meanwhile the new function doesn't
synchronize but just leaves as is.  It's the responsibility by the
caller's side to synchronize, or the caller may accept the
asynchronous binding on the fly.

v1->v2: Fix missing NULL check in master_bind/unbind

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 37 insertions, 13 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index bf174a013f2d..1de5491fb9bf 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -183,7 +183,7 @@ struct hdmi_spec {
 	hda_nid_t vendor_nid;
 };
 
-#ifdef CONFIG_SND_HDA_I915
+#ifdef CONFIG_SND_HDA_COMPONENT
 static inline bool codec_has_acomp(struct hda_codec *codec)
 {
 	struct hdmi_spec *spec = codec->spec;
@@ -2288,7 +2288,7 @@ static void generic_hdmi_free(struct hda_codec *codec)
 	int pin_idx, pcm_idx;
 
 	if (codec_has_acomp(codec))
-		snd_hdac_i915_register_notifier(&codec->bus->core, NULL);
+		snd_hdac_acomp_register_notifier(&codec->bus->core, NULL);
 
 	for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
 		struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
@@ -2471,6 +2471,38 @@ static void haswell_set_power_state(struct hda_codec *codec, hda_nid_t fg,
 	snd_hda_codec_set_power_to_all(codec, fg, power_state);
 }
 
+/* There is a fixed mapping between audio pin node and display port.
+ * on SNB, IVY, HSW, BSW, SKL, BXT, KBL:
+ * 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)
+ *
+ * on VLV, ILK:
+ * Pin Widget 4 - PORT B (port = 1 in i915 driver)
+ * Pin Widget 5 - PORT C (port = 2 in i915 driver)
+ * Pin Widget 6 - PORT D (port = 3 in i915 driver)
+ */
+static int intel_base_nid(struct hda_codec *codec)
+{
+	switch (codec->core.vendor_id) {
+	case 0x80860054: /* ILK */
+	case 0x80862804: /* ILK */
+	case 0x80862882: /* VLV */
+		return 4;
+	default:
+		return 5;
+	}
+}
+
+static int intel_pin2port(void *audio_ptr, int pin_nid)
+{
+	int base_nid = intel_base_nid(audio_ptr);
+
+	if (WARN_ON(pin_nid < base_nid || pin_nid >= base_nid + 3))
+		return -1;
+	return pin_nid - base_nid + 1; /* intel port is 1-based */
+}
+
 static void intel_pin_eld_notify(void *audio_ptr, int port, int pipe)
 {
 	struct hda_codec *codec = audio_ptr;
@@ -2481,16 +2513,7 @@ static void intel_pin_eld_notify(void *audio_ptr, int port, int pipe)
 	if (port < 1 || port > 3)
 		return;
 
-	switch (codec->core.vendor_id) {
-	case 0x80860054: /* ILK */
-	case 0x80862804: /* ILK */
-	case 0x80862882: /* VLV */
-		pin_nid = port + 0x03;
-		break;
-	default:
-		pin_nid = port + 0x04;
-		break;
-	}
+	pin_nid = port + intel_base_nid(codec) - 1; /* intel port is 1-based */
 
 	/* skip notification during system suspend (but not in runtime PM);
 	 * the state will be updated at resume
@@ -2517,8 +2540,9 @@ static void register_i915_notifier(struct hda_codec *codec)
 	 * We need make sure audio_ptr is really setup
 	 */
 	wmb();
+	spec->drm_audio_ops.pin2port = intel_pin2port;
 	spec->drm_audio_ops.pin_eld_notify = intel_pin_eld_notify;
-	snd_hdac_i915_register_notifier(&codec->bus->core,
+	snd_hdac_acomp_register_notifier(&codec->bus->core,
 					&spec->drm_audio_ops);
 }