ASoC: Tegra: Add compress offload volume control

Add alsa control for volume changes during compress
offload playback.

Bug 1498475
Change-Id: I5572338648a2fefdcf3095702bcbade35f1b0565
Signed-off-by: Deepa Madiregama <dmadiregama@nvidia.com>
Reviewed-on: http://git-master/r/399682
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sumit Bhattacharya <sumitb@nvidia.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra_offload.c b/sound/soc/tegra/tegra_offload.c
index 465d28f8a961..3940f42c44ea 100644
--- a/sound/soc/tegra/tegra_offload.c
+++ b/sound/soc/tegra/tegra_offload.c
@@ -51,6 +51,8 @@ struct tegra_offload_compr_data {
 	struct tegra_offload_compr_ops *ops;
 	struct snd_codec codec;
 	int stream_id;
+	int stream_vol[2];
+	struct snd_kcontrol *kcontrol;
 };
 
 static struct tegra_offload_ops offload_ops;
@@ -107,6 +109,80 @@ static void tegra_offload_compr_fragment_elapsed(void *arg, unsigned int is_eos)
 	}
 }
 
+static int tegra_set_compress_volume(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	int ret = 1;
+	struct snd_compr_stream *stream = snd_kcontrol_chip(kcontrol);
+	struct tegra_offload_compr_data *data = stream->runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = stream->device->private_data;
+	struct device *dev = rtd->platform->dev;
+
+	pr_debug("%s: value[0]: %d value[1]: %d\n", __func__,
+		(int)ucontrol->value.integer.value[0],
+		(int)ucontrol->value.integer.value[1]);
+	ret = data->ops->set_stream_volume(data->stream_id,
+			(int)ucontrol->value.integer.value[0],
+			(int)ucontrol->value.integer.value[1]);
+	if (ret < 0) {
+		dev_err(dev, "Failed to get compr caps. ret %d", ret);
+		return ret;
+	} else {
+		data->stream_vol[0] = (int)ucontrol->value.integer.value[0];
+		data->stream_vol[1] = (int)ucontrol->value.integer.value[1];
+	}
+	return 1;
+}
+
+
+static int tegra_get_compress_volume(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_compr_stream *stream = snd_kcontrol_chip(kcontrol);
+	struct tegra_offload_compr_data *data = stream->runtime->private_data;
+
+	ucontrol->value.integer.value[0] = data->stream_vol[0];
+	ucontrol->value.integer.value[1] = data->stream_vol[1];
+
+	return 0;
+}
+
+struct snd_kcontrol_new tegra_offload_volume =
+		SOC_DOUBLE_EXT("Compress Playback Volume", 0, 1, 0, 0xFFFFFFFF,
+		1, tegra_get_compress_volume, tegra_set_compress_volume);
+
+static int tegra_offload_compr_add_controls(struct snd_compr_stream *stream)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd = stream->device->private_data;
+	struct device *dev = rtd->platform->dev;
+	struct tegra_offload_compr_data *data = stream->runtime->private_data;
+
+	data->kcontrol =  snd_ctl_new1(&tegra_offload_volume, stream);
+	ret = snd_ctl_add(rtd->card->snd_card, data->kcontrol);
+	if (ret < 0) {
+		dev_err(dev, "Can't add offload volume");
+		return ret;
+	}
+	return ret;
+}
+
+
+static int tegra_offload_compr_remove_controls(struct snd_compr_stream *stream)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd = stream->device->private_data;
+	struct device *dev = rtd->platform->dev;
+	struct tegra_offload_compr_data *data = stream->runtime->private_data;
+
+	ret = snd_ctl_remove(rtd->card->snd_card, data->kcontrol);
+	if (ret < 0) {
+		dev_err(dev, "Can't remove offload volume");
+		return ret;
+	}
+	return ret;
+}
+
 static int tegra_offload_compr_open(struct snd_compr_stream *stream)
 {
 	struct snd_soc_pcm_runtime *rtd = stream->device->private_data;
@@ -138,6 +214,11 @@ static int tegra_offload_compr_open(struct snd_compr_stream *stream)
 	}
 
 	stream->runtime->private_data = data;
+
+	ret = tegra_offload_compr_add_controls(stream);
+	if (ret)
+		dev_err(dev, "Failed to add controls\n");
+
 	return 0;
 }
 
@@ -145,9 +226,14 @@ static int tegra_offload_compr_free(struct snd_compr_stream *stream)
 {
 	struct device *dev = stream->device->dev;
 	struct tegra_offload_compr_data *data = stream->runtime->private_data;
+	int ret = 0;
 
 	dev_vdbg(dev, "%s", __func__);
 
+	ret = tegra_offload_compr_remove_controls(stream);
+	if (ret)
+		dev_err(dev, "Failed to remove controls\n");
+
 	data->ops->stream_close(data->stream_id);
 	devm_kfree(dev, data);
 	return 0;