[PATCH BlueZ v1 2/2] vcp: Fix using scaled values for volume

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This makes the volume range 0-255 as per VCP spec rather than scaling it
to fit 0-127.
---
 profiles/audio/transport.c | 14 +++++++-------
 profiles/audio/vcp.c       | 23 +++++------------------
 profiles/audio/vcp.h       |  4 ++--
 3 files changed, 14 insertions(+), 27 deletions(-)

diff --git a/profiles/audio/transport.c b/profiles/audio/transport.c
index eff95a7c2655..4635c978bd80 100644
--- a/profiles/audio/transport.c
+++ b/profiles/audio/transport.c
@@ -126,8 +126,8 @@ struct media_transport_ops {
 	void (*set_state)(struct media_transport *transport,
 				transport_state_t state);
 	void *(*get_stream)(struct media_transport *transport);
-	int8_t (*get_volume)(struct media_transport *transport);
-	int (*set_volume)(struct media_transport *transport, int8_t level);
+	uint8_t (*get_volume)(struct media_transport *transport);
+	int (*set_volume)(struct media_transport *transport, uint8_t level);
 	int (*set_delay)(struct media_transport *transport, uint16_t delay);
 	void (*update_links)(const struct media_transport *transport);
 	GDestroyNotify destroy;
@@ -616,7 +616,7 @@ static void transport_a2dp_remove_owner(struct media_transport *transport,
 	a2dp->cancel_resume = FALSE;
 }
 
-static int8_t transport_a2dp_get_volume(struct media_transport *transport)
+static uint8_t transport_a2dp_get_volume(struct media_transport *transport)
 {
 	struct a2dp_transport *a2dp = transport->data;
 	return a2dp->volume;
@@ -624,7 +624,7 @@ static int8_t transport_a2dp_get_volume(struct media_transport *transport)
 
 #ifdef HAVE_AVRCP
 static int transport_a2dp_src_set_volume(struct media_transport *transport,
-					int8_t level)
+					uint8_t level)
 {
 	struct a2dp_transport *a2dp = transport->data;
 
@@ -635,7 +635,7 @@ static int transport_a2dp_src_set_volume(struct media_transport *transport,
 }
 
 static int transport_a2dp_snk_set_volume(struct media_transport *transport,
-					int8_t level)
+					uint8_t level)
 {
 	struct a2dp_transport *a2dp = transport->data;
 	bool notify;
@@ -2190,13 +2190,13 @@ static void bap_connecting(struct bt_bap_stream *stream, bool state, int fd,
 	bap_update_links(transport);
 }
 
-static int8_t transport_bap_get_volume(struct media_transport *transport)
+static uint8_t transport_bap_get_volume(struct media_transport *transport)
 {
 	return bt_audio_vcp_get_volume(transport->device);
 }
 
 static int transport_bap_set_volume(struct media_transport *transport,
-								int8_t volume)
+								uint8_t volume)
 {
 	return bt_audio_vcp_set_volume(transport->device, volume) ? 0 : -EIO;
 }
diff --git a/profiles/audio/vcp.c b/profiles/audio/vcp.c
index 608496a003b6..423210b4af3b 100644
--- a/profiles/audio/vcp.c
+++ b/profiles/audio/vcp.c
@@ -103,25 +103,12 @@ static bool match_data(const void *data, const void *match_data)
 	return vdata->vcp == vcp;
 }
 
-static int8_t scale_volume(uint8_t volume)
-{
-	/* Convert 0-255 to 0-127. */
-	return volume / 2;
-}
-
-static uint8_t unscale_volume(int8_t volume)
-{
-	/* Convert 0-127 to 0-255. */
-	return volume * 2;
-}
-
 static void vcp_volume_changed(struct bt_vcp *vcp, uint8_t volume)
 {
 	struct vcp_data *data = queue_find(sessions, match_data, vcp);
 
 	if (data)
-		media_transport_update_device_volume(data->device,
-						      scale_volume(volume));
+		media_transport_update_device_volume(data->device, volume);
 }
 
 static void vcp_data_add(struct vcp_data *data)
@@ -179,22 +166,22 @@ static void vcp_data_remove(struct vcp_data *data)
 	}
 }
 
-int8_t bt_audio_vcp_get_volume(struct btd_device *device)
+uint8_t bt_audio_vcp_get_volume(struct btd_device *device)
 {
 	struct vcp_data *data = queue_find(sessions, match_device, device);
 
 	if (data)
-		return scale_volume(bt_vcp_get_volume(data->vcp));
+		return bt_vcp_get_volume(data->vcp);
 
 	return 0;
 }
 
-bool bt_audio_vcp_set_volume(struct btd_device *device, int8_t volume)
+bool bt_audio_vcp_set_volume(struct btd_device *device, uint8_t volume)
 {
 	struct vcp_data *data = queue_find(sessions, match_device, device);
 
 	if (data)
-		return bt_vcp_set_volume(data->vcp, unscale_volume(volume));
+		return bt_vcp_set_volume(data->vcp, volume);
 
 	return FALSE;
 }
diff --git a/profiles/audio/vcp.h b/profiles/audio/vcp.h
index f313cd96a5fc..cf7935d1a4ea 100644
--- a/profiles/audio/vcp.h
+++ b/profiles/audio/vcp.h
@@ -8,5 +8,5 @@
  *
  */
 
-int8_t bt_audio_vcp_get_volume(struct btd_device *device);
-bool bt_audio_vcp_set_volume(struct btd_device *device, int8_t volume);
+uint8_t bt_audio_vcp_get_volume(struct btd_device *device);
+bool bt_audio_vcp_set_volume(struct btd_device *device, uint8_t volume);
-- 
2.48.1