Check if the siggen comp has exactly 1 kcontrol for triggering.
Since the kcontrol for the siggen serves as an
ON/OFF switch, its max value should be 1.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

This patch proposes a new IO handler for switch type kcontrols
which can be used to trigger components such as siggen or control
volume mute functionality.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

…rol IO handler

This patch adds the changes to the switch control IO handler to
handle the additional steps required to trigger the siggen
pipeline based on user input.wq

When the user switches the siggen control ON, the IO handler sends
the ipc messages required to set up the pcm params and start the
pipeline.

When the user switches it off, it frees the pcm and resets the pipeline.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Hostless pipelines lack a FE dai that is used to establish a path
to the BE and enable the codecs. Virtual FE dai links can be used in
such cases to establish a connection to the
BE. This patch adds a new flag named "virtual" to the
dai link structure that will be used to check if a dai link is
virtual.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

This patch adds the methods for create a virtual FE dal link
and add it to the sound card. It also adds the method to free
the virtual FE connected to the card.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

When walking the graph to discover the path from the virtual FE to
the BE, there is only one widget in the path. Do not remove
this BE widget from the list, so it can be used to connect with the
virtual FE dai link.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

…iggen widget

Since hostless pipelines do not have a PCM, they need a virtual
FE dai link that can be used to startup the BE dai links
when the pipeline is triggered. Without this, the BE dai links
do not get enabled and the tone would be inaudible.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

…irtual dai link

Virtual FE dai links should be manually set to running
state by default with a pcm runtime. The active count of their cpu_dai
and codec_dai's should also be updated. This is required to establish
FE-BE connection and enable the BE DAI when the dpcm runtime is updated.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Virtual FE dai links do not need to register the pcm device. So
just create the empty pcm device and substream in the
requested direction.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

the soc_dpcm_runtime_update() method will be called to establish a
connection to the BE and enable the codec. So make this method
accessible to modules.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Enable BE dai before triggering the siggen pipeline by calling
the soc_dpcm_runtime_update() method.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>