ucm2: common: pcm: Add hdmi.conf to handle the creation

User space expect to see hdmi: PCM devices to be able to use bytestream
passthrough.

The common/pcm/hdmi.conf provides two macros:
HdmiPCM: to generate an ALSA conf section for an hdmi: PCM device
HdmiPCMSave: to save the generated config

Example of use (sof-hda-dsp card with hardware HDMI PCMs: 3-5):
Macro.0.HdmiPCM { Device 3 Index 0 }
Macro.1.HdmiPCM { Device 4 Index 1 }
Macro.2.HdmiPCM { Device 5 Index 2 }
Macro.3.HdmiPCMSave { }

Closes: https://github.com/alsa-project/alsa-ucm-conf/pull/411
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/ucm2/common/pcm/hdmi.conf b/ucm2/common/pcm/hdmi.conf
new file mode 100644 (file)
index 0000000..0a870ed
--- /dev/null
+++ b/ucm2/common/pcm/hdmi.conf
@@ -0,0 +1,74 @@
+# Macro HdmiPCM - Generate ALSA control section for hdmi: PCM device
+#
+# Arguments:
+#   Device - hardware PCM device
+#   Index - hdmi: device index and control index
+#
+
+DefineMacro.HdmiPCM {
+       LibraryConfig.generic.Config.hdmi-pcm.pcm.hdmi."${var:__Index}" {
+               @args [ CARD AES0 AES1 AES2 AES3 ]
+               @args.CARD {
+                       type string
+               }
+               @args.AES0 {
+                       type integer
+               }
+               @args.AES1 {
+                       type integer
+               }
+               @args.AES2 {
+                       type integer
+               }
+               @args.AES3 {
+                       type integer
+               }
+               type hooks
+               slave.pcm {
+                       type hw
+                       card $CARD
+                       device "${evali:$__Device}"
+               }
+               hooks.0 {
+                       type ctl_elems
+                       hook_args [
+                       {
+                               name "IEC958 Playback Default"
+                               index "${evali:$__Index}"
+                               lock true
+                               preserve true
+                               value [ $AES0 $AES1 $AES2 $AES3 ]
+                       }
+                       {
+                               name "IEC958 Playback Switch"
+                               index "${evali:$__Index}"
+                               value true
+                       }
+                       ]
+               }
+               hint.device "${evali:$__Device}"
+       }
+}
+
+# Macro HdmiPCMSave - Save the generated ALSA control for hdmi: PCM device(s)
+#                    generated inside 'hdmi-pcm' section by prior calls to
+#                    HdmiPCM macro
+#
+# Arguments:
+#   [Name] - Optional name excluding the .conf extension to use for the
+#           configuration file, defaults to "42-hdmi-pcm"
+#
+
+DefineMacro.HdmiPCMSave {
+       If.name {
+               Condition {
+                       Type String
+                       Empty "${var:-__Name}"
+               }
+               True.Define.__Name "42-hdmi-pcm"
+       }
+
+       FixedBootSequence [
+                       cfg-save "${var:LibDir}/${var:__Name}.conf:hdmi-pcm"
+       ]
+}