commit 1f60cf8ce4276473878a22956ae546911353ebd2
author Ravi Kumar Alamanda <ralama@codeaurora.org> Thu Apr 23 19:45:17 2015 -0700
committer Eric Laurent <elaurent@google.com> Thu May 21 11:40:31 2015 -0700
tree 73a579bef0e84653065f3e8b9d34b08846ee5864
parent d2063ecff8f2a4f495358a3285f26bfc5e533630

hal: support seamless speaker channels swapping

Change-Id: Ia82254cfb5d2021759f6874e7d7272c75ab91497

hal/msm8974/platform.c

diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 7ba0bf0..820b4b7 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -78,6 +78,8 @@
     bool fluence_in_voice_comm;
     bool fluence_in_voice_rec;
     int  dualmic_config;
+    bool speaker_lr_swap;
+
     void *acdb_handle;
     acdb_init_t                acdb_init;
     acdb_deallocate_t          acdb_deallocate;
@@ -1265,7 +1267,7 @@
     } else if (devices & AUDIO_DEVICE_OUT_SPEAKER_SAFE) {
         snd_device = SND_DEVICE_OUT_SPEAKER_SAFE;
     } else if (devices & AUDIO_DEVICE_OUT_SPEAKER) {
-        if (adev->speaker_lr_swap)
+        if (my_data->speaker_lr_swap)
             snd_device = SND_DEVICE_OUT_SPEAKER_REVERSE;
         else
             snd_device = SND_DEVICE_OUT_SPEAKER;
@@ -1734,3 +1736,32 @@
 done:
     return ret;
 }
+
+int platform_swap_lr_channels(struct audio_device *adev, bool swap_channels)
+{
+    // only update if there is active pcm playback on speaker
+    struct audio_usecase *usecase;
+    struct listnode *node;
+    struct platform_data *my_data = (struct platform_data *)adev->platform;
+
+    if (my_data->speaker_lr_swap != swap_channels) {
+        my_data->speaker_lr_swap = swap_channels;
+
+        list_for_each(node, &adev->usecase_list) {
+            usecase = node_to_item(node, struct audio_usecase, list);
+            if (usecase->type == PCM_PLAYBACK &&
+                usecase->stream.out->devices & AUDIO_DEVICE_OUT_SPEAKER) {
+                const char *mixer_path;
+                if (swap_channels) {
+                    mixer_path = platform_get_snd_device_name(SND_DEVICE_OUT_SPEAKER_REVERSE);
+                    audio_route_apply_and_update_path(adev->audio_route, mixer_path);
+                } else {
+                    mixer_path = platform_get_snd_device_name(SND_DEVICE_OUT_SPEAKER);
+                    audio_route_apply_and_update_path(adev->audio_route, mixer_path);
+                }
+                break;
+            }
+        }
+    }
+    return 0;
+}