ASoC: topology: Update TLV support so we can support more TLV types

Currently the TLV topology structure is targeted at only supporting the
DB scale data. This patch extends support for the other TLV types so they
can be easily added at a later stage.

TLV structure is moved to common topology control header since it's a
common field for controls and can be processed in a general way.

Users must set a proper access flag for a control since it's used to
decide if the TLV field is valid and if a TLV callback is needed.

Removed the following fields from topology TLV struct:
- size/count: type can decide the size.
- numid: not needed to initialize TLV for kcontrol.
- data: replaced by the type specific struct.

Added TLV structure to generic control header and removed TLV structure
from mixer control.

Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 41 insertions, 17 deletions

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 2c70f30..31068b8 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -33,6 +33,7 @@
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/soc-topology.h>
+#include <sound/tlv.h>
 
 /*
  * We make several passes over the data (since it wont necessarily be ordered)
@@ -579,28 +580,51 @@ static int soc_tplg_init_kcontrol(struct soc_tplg *tplg,
 	return 0;
 }
 
+
+static int soc_tplg_create_tlv_db_scale(struct soc_tplg *tplg,
+	struct snd_kcontrol_new *kc, struct snd_soc_tplg_tlv_dbscale *scale)
+{
+	unsigned int item_len = 2 * sizeof(unsigned int);
+	unsigned int *p;
+
+	p = kzalloc(item_len + 2 * sizeof(unsigned int), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	p[0] = SNDRV_CTL_TLVT_DB_SCALE;
+	p[1] = item_len;
+	p[2] = scale->min;
+	p[3] = (scale->step & TLV_DB_SCALE_MASK)
+			| (scale->mute ? TLV_DB_SCALE_MUTE : 0);
+
+	kc->tlv.p = (void *)p;
+	return 0;
+}
+
 static int soc_tplg_create_tlv(struct soc_tplg *tplg,
-	struct snd_kcontrol_new *kc, struct snd_soc_tplg_ctl_tlv *tplg_tlv)
+	struct snd_kcontrol_new *kc, struct snd_soc_tplg_ctl_hdr *tc)
 {
-	struct snd_ctl_tlv *tlv;
-	int size;
+	struct snd_soc_tplg_ctl_tlv *tplg_tlv;
 
-	if (tplg_tlv->count == 0)
+	if (!(tc->access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE))
 		return 0;
 
-	size = ((tplg_tlv->count + (sizeof(unsigned int) - 1)) &
-		~(sizeof(unsigned int) - 1));
-	tlv = kzalloc(sizeof(*tlv) + size, GFP_KERNEL);
-	if (tlv == NULL)
-		return -ENOMEM;
-
-	dev_dbg(tplg->dev, " created TLV type %d size %d bytes\n",
-		tplg_tlv->numid, size);
+	if (tc->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
+		kc->tlv.c = snd_soc_bytes_tlv_callback;
+	} else {
+		tplg_tlv = &tc->tlv;
+		switch (tplg_tlv->type) {
+		case SNDRV_CTL_TLVT_DB_SCALE:
+			return soc_tplg_create_tlv_db_scale(tplg, kc,
+					&tplg_tlv->scale);
 
-	tlv->numid = tplg_tlv->numid;
-	tlv->length = size;
-	memcpy(&tlv->tlv[0], tplg_tlv->data, size);
-	kc->tlv.p = (void *)tlv;
+		/* TODO: add support for other TLV types */
+		default:
+			dev_dbg(tplg->dev, "Unsupported TLV type %d\n",
+					tplg_tlv->type);
+			return -EINVAL;
+		}
+	}
 
 	return 0;
 }
@@ -772,7 +796,7 @@ static int soc_tplg_dmixer_create(struct soc_tplg *tplg, unsigned int count,
 		}
 
 		/* create any TLV data */
-		soc_tplg_create_tlv(tplg, &kc, &mc->tlv);
+		soc_tplg_create_tlv(tplg, &kc, &mc->hdr);
 
 		/* register control here */
 		err = soc_tplg_add_kcontrol(tplg, &kc,