[alsa-devel] [RFC PATCH 2/3] ucm: Parse sequence of component devices

[Liam Girdwood]

On Tue, 2016-11-15 at 16:02 +0800, mengdong.lin at linux.intel.com wrote:
> From: Mengdong Lin <mengdong.lin at linux.intel.com>
> 
> A machine device's verb file (e.g.HiFi) can include configuration files
> of component devices via alsaconf syntax <searchdir:xxx> and <file_name>.
> Then the machine device's sequence can enable or disable a component
> device by keyword 'enadev' and 'disdev' followed the name of the component
> device.
> 
> UCM sequence parser will find the component device and mark if its enable
> or disable sequence is needed by the parent, the machine device.
> 
> New element type and struct are defined for the sequence of a component
> device. Component devices will be removed from the machine device list
> 'device_list' of a verb, since we don't want to expose them to audio
> servers with original API to list devices for backward compatibility.
> A new list 'cmpt_device_list' is used for the component devices of a verb.
> 
> Signed-off-by: Mengdong Lin <mengdong.lin at linux.intel.com>
> 



> @@ -306,6 +381,30 @@ static int parse_sequence(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED,
>  			continue;
>  		}
>  
> +		if (strcmp(cmd, "enadev") == 0) {
> +			/* need to enable a component device */
> +			curr->type = SEQUENCE_ELEMENT_TYPE_CMPT_SEQ;
> +			err = parse_component_seq(uc_mgr, n, 1,
> +						&curr->data.cmpt_seq);
> +			if (err < 0) {
> +				uc_error("error: enadev requires a valid device!");
> +				return err;
> +			}
> +			continue;
> +		}
> +
> +		if (strcmp(cmd, "disdev") == 0) {

Do we need to document enadev and disdev anywhere ?

Liam