ASoC: dapm: add a dapm sink widget

DAPM models various widgets but lacks a sink widget.
DSPs can have modules which take audio data, process it and are
capable of generating events thus acting as a sink of data.

To make the dapm graph complete for such paths we need a dapm
sink widget for these modules, so add a SND_SOC_DAPM_SINK to
declare such a widget.  This widget will be treated as
SND_SOC_DAPM_EP_SINK endpoint in the dapm graph

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 7855cfe..fe19dd3 100644 (file)
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -49,6 +49,9 @@ struct device;
 #define SND_SOC_DAPM_SIGGEN(wname) \
 {      .id = snd_soc_dapm_siggen, .name = wname, .kcontrol_news = NULL, \
        .num_kcontrols = 0, .reg = SND_SOC_NOPM }
+#define SND_SOC_DAPM_SINK(wname) \
+{      .id = snd_soc_dapm_sink, .name = wname, .kcontrol_news = NULL, \
+       .num_kcontrols = 0, .reg = SND_SOC_NOPM }
 #define SND_SOC_DAPM_INPUT(wname) \
 {      .id = snd_soc_dapm_input, .name = wname, .kcontrol_news = NULL, \
        .num_kcontrols = 0, .reg = SND_SOC_NOPM }
@@ -484,6 +487,7 @@ enum snd_soc_dapm_type {
        snd_soc_dapm_aif_in,            /* audio interface input */
        snd_soc_dapm_aif_out,           /* audio interface output */
        snd_soc_dapm_siggen,            /* signal generator */
+       snd_soc_dapm_sink,
        snd_soc_dapm_dai_in,            /* link to DAI structure */
        snd_soc_dapm_dai_out,
        snd_soc_dapm_dai_link,          /* link between two DAI structures */

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 016eba1..6760044 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3351,6 +3351,11 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
                w->is_ep = SND_SOC_DAPM_EP_SOURCE;
                w->power_check = dapm_always_on_check_power;
                break;
+       case snd_soc_dapm_sink:
+               w->is_ep = SND_SOC_DAPM_EP_SINK;
+               w->power_check = dapm_always_on_check_power;
+               break;
+
        case snd_soc_dapm_mux:
        case snd_soc_dapm_demux:
        case snd_soc_dapm_switch: