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Wed, 19 Mar 2025 00:51:55 GMT Received: from hu-wcheng-lv.qualcomm.com (10.49.16.6) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Tue, 18 Mar 2025 17:51:55 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v36 15/31] ASoC: usb: Add PCM format check API for USB backend Date: Tue, 18 Mar 2025 17:51:25 -0700 Message-ID: <20250319005141.312805-16-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250319005141.312805-1-quic_wcheng@quicinc.com> References: <20250319005141.312805-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: cc0sLQ1rN5ozTVPRP2sHM8hNM0dY_Rq7 X-Proofpoint-ORIG-GUID: cc0sLQ1rN5ozTVPRP2sHM8hNM0dY_Rq7 X-Authority-Analysis: v=2.4 cv=UoJjN/wB c=1 sm=1 tr=0 ts=67da152c cx=c_pps a=ouPCqIW2jiPt+lZRy3xVPw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=3H110R4YSZwA:10 a=Vs1iUdzkB0EA:10 a=QyXUC8HyAAAA:8 a=COk6AnOGAAAA:8 a=YBvYe58geRVWg8MYcjsA:9 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-18_10,2025-03-17_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 impostorscore=0 bulkscore=0 priorityscore=1501 mlxlogscore=999 phishscore=0 adultscore=0 clxscore=1015 spamscore=0 suspectscore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503190003 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. Reviewed-by: Pierre-Louis Bossart Signed-off-by: Wesley Cheng --- include/sound/soc-usb.h | 11 +++++++++++ sound/soc/soc-usb.c | 26 ++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/include/sound/soc-usb.h b/include/sound/soc-usb.h index a7be5d05218f..188b8df52932 100644 --- a/include/sound/soc-usb.h +++ b/include/sound/soc-usb.h @@ -48,6 +48,10 @@ 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 *usbdev); @@ -58,6 +62,13 @@ 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 edfc52c88b58..cb2025d7b58f 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -71,6 +71,32 @@ void *snd_soc_usb_find_priv_data(struct device *usbdev) } 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 port for offloading support * @component: USB DPCM backend DAI component