[alsa-devel] [RFC PATCH 1/3] ucm: Skip component directories when scanning sound card configuration files

[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>
> 
> Cards are defined by machines. DSPs embedded in SoC and off-soc codecs
> can be taken as components for machines, and can be reused by different
> machines/cards. Codec and SoC vendors can define their own UCM config
> files. If a codec or DSP is used by a machine, the card configuration file
> can include the conf file of the codec and DSP. Later patches will
> complete support for this feature.
> 
> Two new directories will be used to store the UCM configuration files for
> a specific codec or DSP firmware:
> - /usr/share/alsa/ucm/dsps ... for DSP embedded in SoC
> - /usr/share/alsa/ucm/codecs ... for off-soc codecs
> 
> These two directories will be skipped when UCM manager scans the card
> directories under /usr/share/alsa/ucm.
> 
> Signed-off-by: Mengdong Lin <mengdong.lin at linux.intel.com>
> 
> diff --git a/src/ucm/parser.c b/src/ucm/parser.c
> index 13f62d7..5fc98a1 100644
> --- a/src/ucm/parser.c
> +++ b/src/ucm/parser.c
> @@ -1259,7 +1259,18 @@ static int filename_filter(const struct dirent *dirent)
>  	return 0;
>  }
>  
> -/* scan all cards and comments */
> +/* scan all cards and comments
> + *
> + * Cards are defined by machines. Each card/machine installs its UCM
> + * configuration files in a subdirectory with the same name as the sound
> + * card under /usr/share/alsa/ucm. This function will scan all the card
> + * directories.
> + * Two direcotries, 'codecs' and 'dsps', are skipped in the scanning. These
> + * two directories are used to store UCM configurations file for off-soc
> + * codecs and DSPs embedded in SoC, which are components of machines.
> + * Their configuration files can be included by different machines/cards,
> + * and alsaconf will import the included files automatically.
> + */
>  int uc_mgr_scan_master_configs(const char **_list[])
>  {
>  	char filename[MAX_FILE], dfl[MAX_FILE];
> @@ -1309,6 +1320,13 @@ int uc_mgr_scan_master_configs(const char **_list[])
>  	}
>  
>  	for (i = 0; i < cnt; i++) {
> +
> +		/* Skip the directories for component devices */
> +		if (!strncmp(namelist[i]->d_name, "codecs", 6))
> +			continue;
> +		if (!strncmp(namelist[i]->d_name, "dsps", 4))
> +			continue;

Maybe we should have an array of strings that denote directories that
contain non master components, that way we could easily add other
directories for components.

Liam