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authorTakashi Iwai <tiwai@suse.de>2015-12-01 14:39:38 +0300
committerTakashi Iwai <tiwai@suse.de>2015-12-10 16:41:07 +0300
commite2dc7d7d8ed3019f72855af1c3dcda3fb456b488 (patch)
tree5cccbc6953734de5a81082e6adbd8ebac4a4ca4b /sound/hda/hdac_i915.c
parent788d441a164caea0a5d82e1d5bcd161820bfe62a (diff)
downloadlinux-e2dc7d7d8ed3019f72855af1c3dcda3fb456b488.tar.xz
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>
Diffstat (limited to 'sound/hda/hdac_i915.c')
-rw-r--r--sound/hda/hdac_i915.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index 8fef1b8d1fd8..c50177fb469f 100644
--- a/sound/hda/hdac_i915.c
+++ b/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;