[PATCH v24 33/34] ASoC: usb: Add PCM format check API for USB backend

[Wesley Cheng]

Introduce a helper to check if a particular PCM format is supported by the
USB audio device connected.  If the USB audio device does not have an
audio profile which can support the requested format, then notify the USB
backend.

Signed-off-by: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
---
 include/sound/soc-usb.h | 10 ++++++++++
 sound/soc/soc-usb.c     | 25 +++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/sound/soc-usb.h b/include/sound/soc-usb.h
index a167e3de0a78..7c875d053981 100644
--- a/include/sound/soc-usb.h
+++ b/include/sound/soc-usb.h
@@ -52,6 +52,9 @@ struct snd_soc_usb {
 };
 
 #if IS_ENABLED(CONFIG_SND_SOC_USB)
+int snd_soc_usb_find_supported_format(int card_idx,
+				struct snd_pcm_hw_params *params, int direction);
+
 int snd_soc_usb_connect(struct device *usbdev, struct snd_soc_usb_device *sdev);
 int snd_soc_usb_disconnect(struct device *usbdev, struct snd_soc_usb_device *sdev);
 void *snd_soc_usb_find_priv_data(struct device *dev);
@@ -68,6 +71,13 @@ void snd_soc_usb_free_port(struct snd_soc_usb *usb);
 void snd_soc_usb_add_port(struct snd_soc_usb *usb);
 void snd_soc_usb_remove_port(struct snd_soc_usb *usb);
 #else
+static inline int snd_soc_usb_find_supported_format(int card_idx,
+					  struct snd_pcm_hw_params *params,
+					  int direction)
+{
+	return -EINVAL;
+}
+
 static inline int snd_soc_usb_connect(struct device *usbdev,
 					struct snd_soc_usb_device *sdev)
 {
diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c
index b891beb77001..9cb79ad908dd 100644
--- a/sound/soc/soc-usb.c
+++ b/sound/soc/soc-usb.c
@@ -162,6 +162,31 @@ void *snd_soc_usb_find_priv_data(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(snd_soc_usb_find_priv_data);
 
+/**
+ * snd_soc_usb_find_supported_format() - Check if audio format is supported
+ * @card_idx: USB sound chip array index
+ * @params: PCM parameters
+ * @direction: capture or playback
+ *
+ * Ensure that a requested audio profile from the ASoC side is able to be
+ * supported by the USB device.
+ *
+ * Return 0 on success, negative on error.
+ *
+ */
+int snd_soc_usb_find_supported_format(int card_idx,
+				struct snd_pcm_hw_params *params, int direction)
+{
+	struct snd_usb_stream *as;
+
+	as = snd_usb_find_suppported_substream(card_idx, params, direction);
+	if (!as)
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_usb_find_supported_format);
+
 /**
  * snd_soc_usb_allocate_port() - allocate a SOC USB device
  * @component: USB DPCM backend DAI component