[PATCH v4 08/10] usb: gadget: u_audio: Add suspend call

[Pavel Hofman <pavel.hofman@ivitera.com>]

Add exported method u_audio_suspend which sets stream status to
inactive and sends notifications. The method does not free any
resources.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
---
v3:
* fixed commit title
* removed stopping substreams (moved to a separate patch series)
* calling set_active(false) instead of the removed set_srate(0)
* updated commit msg
---
 drivers/usb/gadget/function/u_audio.c | 9 +++++++++
 drivers/usb/gadget/function/u_audio.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index fab1bc439002..2bb569895a90 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -757,6 +757,15 @@ void u_audio_stop_playback(struct g_audio *audio_dev)
 }
 EXPORT_SYMBOL_GPL(u_audio_stop_playback);
 
+void u_audio_suspend(struct g_audio *audio_dev)
+{
+	struct snd_uac_chip *uac = audio_dev->uac;
+
+	set_active(&uac->p_prm, false);
+	set_active(&uac->c_prm, false);
+}
+EXPORT_SYMBOL_GPL(u_audio_suspend);
+
 int u_audio_get_volume(struct g_audio *audio_dev, int playback, s16 *val)
 {
 	struct snd_uac_chip *uac = audio_dev->uac;
diff --git a/drivers/usb/gadget/function/u_audio.h b/drivers/usb/gadget/function/u_audio.h
index 5e6ed0f31cc3..9512b8fccfaa 100644
--- a/drivers/usb/gadget/function/u_audio.h
+++ b/drivers/usb/gadget/function/u_audio.h
@@ -130,4 +130,6 @@ int u_audio_set_volume(struct g_audio *g_audio, int playback, s16 val);
 int u_audio_get_mute(struct g_audio *g_audio, int playback, int *val);
 int u_audio_set_mute(struct g_audio *g_audio, int playback, int val);
 
+void u_audio_suspend(struct g_audio *g_audio);
+
 #endif /* __U_AUDIO_H */
-- 
2.25.1