linux-kernel - [PATCH v15 31/50] ASoC: usb: Add PCM format check API for USB backend

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Date: Mon, 12 Feb 2024 16:54:03 -0800
From: Wesley Cheng <quic_wcheng@...cinc.com>
To: <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <conor+dt@...nel.org>, <corbet@....net>,
        <lgirdwood@...il.com>, <andersson@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <gregkh@...uxfoundation.org>,
        <Thinh.Nguyen@...opsys.com>, <broonie@...nel.org>,
        <bgoswami@...cinc.com>, <tiwai@...e.com>, <robh+dt@...nel.org>,
        <konrad.dybcio@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-sound@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <alsa-devel@...a-project.org>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v15 31/50] ASoC: usb: Add PCM format check API for USB backend

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@...cinc.com>
---
 include/sound/soc-usb.h |  9 +++++++++
 sound/soc/soc-usb.c     | 25 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/sound/soc-usb.h b/include/sound/soc-usb.h
index c0cf5d1e9024..2790b51d979e 100644
--- a/include/sound/soc-usb.h
+++ b/include/sound/soc-usb.h
@@ -39,6 +39,8 @@ struct snd_soc_usb {
 
 #if IS_ENABLED(CONFIG_SND_SOC_USB)
 const char *snd_soc_usb_get_components_tag(bool playback);
+int snd_soc_usb_find_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);
@@ -55,6 +57,13 @@ static inline const char *snd_soc_usb_get_components_tag(bool playback)
 	return "";
 }
 
+static inline int snd_soc_usb_find_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 a1e0363bd760..e3556c397b39 100644
--- a/sound/soc/soc-usb.c
+++ b/sound/soc/soc-usb.c
@@ -80,6 +80,31 @@ void *snd_soc_usb_find_priv_data(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(snd_soc_usb_find_priv_data);
 
+/**
+ * snd_soc_usb_find_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_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);
+
 /**
  * snd_soc_usb_allocate_port() - allocate a SOC USB device
  * @component: USB DPCM backend DAI component