[alsa-devel] [PATCH 3/6] topology: Parse flags for PCM

[mengdong.lin at linux.intel.com]

From: Mengdong Lin <mengdong.lin at linux.intel.com>

Users can define flags by both text conf file and C API.
Add flags and flag_mask to C API template of PCM object.

Signed-off-by: Mengdong Lin <mengdong.lin at linux.intel.com>

diff --git a/include/topology.h b/include/topology.h
index ccd8401..b6a6f19 100644
--- a/include/topology.h
+++ b/include/topology.h
@@ -606,6 +606,11 @@ extern "C" {
  *			"config3"
  *		]
  *	}
+ *
+ *	# Optional boolean flags
+ *	symmetric_rates			"true"
+ *	symmetric_channels		"true"
+ *	symmetric_sample_bits		"false"
  * }
  * </pre>
  *
@@ -863,6 +868,8 @@ struct snd_tplg_pcm_template {
 	unsigned int capture;	/*!< supports capture mode */
 	unsigned int compress;	/*!< 1 = compressed; 0 = PCM */
 	struct snd_tplg_stream_caps_template *caps[2]; /*!< playback & capture for DAI */
+	unsigned int flag_mask; /*!< bitmask of flags to configure */
+	unsigned int flags;     /*!< flag value SND_SOC_TPLG_LNK_FLGBIT_* */
 	int num_streams;	/*!< number of supported configs */
 	struct snd_tplg_stream_template stream[0]; /*!< supported configs */
 };
diff --git a/src/topology/pcm.c b/src/topology/pcm.c
index 6fdf047..bd70dc9 100644
--- a/src/topology/pcm.c
+++ b/src/topology/pcm.c
@@ -364,6 +364,24 @@ static int tplg_parse_fe_dai(snd_tplg_t *tplg ATTRIBUTE_UNUSED,
 	return 0;
 }
 
+/* parse a flag bit of the given mask */
+static int parse_flag(snd_config_t *n, unsigned int mask_in,
+		      unsigned int *mask, unsigned int *flags)
+{
+	const char *val = NULL;
+
+	if (snd_config_get_string(n, &val) < 0)
+		return -EINVAL;
+
+	*mask |= mask_in;
+	if (strcmp(val, "true") == 0)
+		*flags |= mask_in;
+	else
+		*flags &= ~mask_in;
+
+	return 0;
+}
+
 /* Parse pcm (for front end DAI & DAI link) */
 int tplg_parse_pcm(snd_tplg_t *tplg,
 	snd_config_t *cfg, void *private ATTRIBUTE_UNUSED)
@@ -430,6 +448,34 @@ int tplg_parse_pcm(snd_tplg_t *tplg,
 				return err;
 			continue;
 		}
+
+		/* flags */
+		if (strcmp(id, "symmetric_rates") == 0) {
+			err = parse_flag(n,
+				SND_SOC_TPLG_LNK_FLGBIT_SYMMETRIC_RATES,
+				&pcm->flag_mask, &pcm->flags);
+			if (err < 0)
+				return err;
+			continue;
+		}
+
+		if (strcmp(id, "symmetric_channels") == 0) {
+			err = parse_flag(n,
+				SND_SOC_TPLG_LNK_FLGBIT_SYMMETRIC_CHANNELS,
+				&pcm->flag_mask, &pcm->flags);
+			if (err < 0)
+				return err;
+			continue;
+		}
+
+		if (strcmp(id, "symmetric_sample_bits") == 0) {
+			err = parse_flag(n,
+				SND_SOC_TPLG_LNK_FLGBIT_SYMMETRIC_SAMPLEBITS,
+				&pcm->flag_mask, &pcm->flags);
+			if (err < 0)
+				return err;
+			continue;
+		}
 	}
 
 	return 0;
@@ -610,6 +656,9 @@ int tplg_add_pcm_object(snd_tplg_t *tplg, snd_tplg_obj_template_t *t)
 			tplg_add_stream_caps(&pcm->caps[i], pcm_tpl->caps[i]);
 	}
 
+	pcm->flag_mask = pcm_tpl->flag_mask;
+	pcm->flags = pcm_tpl->flags;
+
 	pcm->num_streams = pcm_tpl->num_streams;
 	for (i = 0; i < pcm_tpl->num_streams; i++)
 		tplg_add_stream_object(&pcm->stream[i], &pcm_tpl->stream[i]);
-- 
2.7.4