[RFC PATCH 11/14] sound: soc: soc-usb: Add PCM format check API for USB backend

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Introduce a check for 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 |  3 +++
 sound/soc/soc-usb.c     | 13 +++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/sound/soc-usb.h b/include/sound/soc-usb.h
index 7d52e5d2371c..36df6f4fe093 100644
--- a/include/sound/soc-usb.h
+++ b/include/sound/soc-usb.h
@@ -19,6 +19,9 @@ struct snd_soc_usb {
 	void *priv_data;
 };
 
+int snd_soc_usb_find_format(int card_idx, struct snd_pcm_hw_params *params,
+			int direction);
+
 int snd_soc_usb_connect(int card_idx);
 int snd_soc_usb_disconnect(void);
 void snd_soc_usb_set_priv_data(void *priv);
diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c
index c6c376960e4d..021380a022bc 100644
--- a/sound/soc/soc-usb.c
+++ b/sound/soc/soc-usb.c
@@ -25,6 +25,19 @@ void snd_soc_usb_set_priv_data(void *priv)
 }
 EXPORT_SYMBOL_GPL(snd_soc_usb_set_priv_data);
 
+int snd_soc_usb_find_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_format);
+
 struct snd_soc_usb *snd_soc_usb_add_port(struct device *dev,
 			int (*connection_cb)(struct snd_soc_usb *usb, int card_idx,
 			int connected))



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux