usb: gadget: u_audio: Add capture/playback srate getter

UAC1/UAC2 functions will need to query u_audio about the currently set
srate. Add the getter functions.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220121155308.48794-5-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index dce894d..283a449 100644 (file)
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -515,6 +515,20 @@ int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate)
 }
 EXPORT_SYMBOL_GPL(u_audio_set_capture_srate);
 
+int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val)
+{
+       struct snd_uac_chip *uac = audio_dev->uac;
+       struct uac_rtd_params *prm;
+       unsigned long flags;
+
+       prm = &uac->c_prm;
+       spin_lock_irqsave(&prm->lock, flags);
+       *val = prm->srate;
+       spin_unlock_irqrestore(&prm->lock, flags);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_get_capture_srate);
+
 int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate)
 {
        struct uac_params *params = &audio_dev->params;
@@ -540,6 +554,20 @@ int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate)
 }
 EXPORT_SYMBOL_GPL(u_audio_set_playback_srate);
 
+int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val)
+{
+       struct snd_uac_chip *uac = audio_dev->uac;
+       struct uac_rtd_params *prm;
+       unsigned long flags;
+
+       prm = &uac->p_prm;
+       spin_lock_irqsave(&prm->lock, flags);
+       *val = prm->srate;
+       spin_unlock_irqrestore(&prm->lock, flags);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_get_playback_srate);
+
 int u_audio_start_capture(struct g_audio *audio_dev)
 {
        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 84579fe..5e6ed0f 100644 (file)
--- a/drivers/usb/gadget/function/u_audio.h
+++ b/drivers/usb/gadget/function/u_audio.h
@@ -120,7 +120,9 @@ void u_audio_stop_capture(struct g_audio *g_audio);
 int u_audio_start_playback(struct g_audio *g_audio);
 void u_audio_stop_playback(struct g_audio *g_audio);
 
+int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val);
 int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate);
+int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val);
 int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate);
 
 int u_audio_get_volume(struct g_audio *g_audio, int playback, s16 *val);