From patchwork Wed Mar 19 00:51:23 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 875200 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4FF4914A629; Wed, 19 Mar 2025 00:52:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742345534; cv=none; b=RrmWWNxQ9fkP8zT62k4xdQtCn4myzfqNCPmK3cjVCBsizKywx8JEViL1bIlIFIMASxE+FABgnKJiQHaJllZN3KtxCi6wMPx6RDOXxEUyJcTaPK4TZ1PoUxV/ndVoQ2X5a+qYpw8RXvLxpTrMDrNpzeNSddAmzr8ttAkSEb5LFuo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742345534; c=relaxed/simple; bh=j/c6lBUb/+5zMcmoE9IPvHYGY8MPsPKhxhlYshndOKA=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EUgcELIZ4gV0AAY66idXQsNvtk/+VV6uU2brf7hO34MUeZDxYgXzwOvyU6h0hpiDLRTbhC6OfBhRCJ0ik2LU7fc+yOCQgvO9NWKTGgpNzPyKtT14wf0Wkah01aHhOtcLW9dmvmoE1+HdBsEgjqqGiHJyJciKGGkRzX63Ne4UO84= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=MbdMcVhP; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="MbdMcVhP" Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 52IKYJon023932; Wed, 19 Mar 2025 00:51:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= 9t+5MC6CtzjYmpWFQEWwq0uUNuZ/YS/w2dz1hCFRDhs=; b=MbdMcVhPOomVBLoF W+yC5FbqgJXpoFlrG3FhntoEGo+I+kblPMEzLgZ4Wi/bCwbaT1gE90lj5dEDbEBr Ay/GGJNpzVyqShhfBTAS+7PBjK59ogxOnyDXQKmbLM8ksAKITGkK3K+qMSVAtkLH 18ZjTf1iisHxGjhtlSs7W9QrVppsecpcl6FmkUZ+9BFVR1j3x7QnkKbMiDtPpVDM 5SJhg20NWTfK4p/9PoI+jrI989StTKQL0Ls5mZq4PMms9ryOMHCOTIDk9bVCs04v FTp2i1ILeXLEYpBwYx8G3mlnVI9xco0xlXHqHvFd0R0XoNqU5OZWmHI/Tlfg8/o5 PfVTMg== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 45exwx3hrf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Mar 2025 00:51:55 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 52J0pttL019345 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); 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 17:51:54 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v36 13/31] ALSA: usb-audio: Allow for rediscovery of connected USB SND devices Date: Tue, 18 Mar 2025 17:51:23 -0700 Message-ID: <20250319005141.312805-14-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-ORIG-GUID: AL2Wyn1xM9cxg0cczb4NnxDCxIt-5_k_ X-Authority-Analysis: v=2.4 cv=INICChvG c=1 sm=1 tr=0 ts=67da152b cx=c_pps a=ouPCqIW2jiPt+lZRy3xVPw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=3H110R4YSZwA:10 a=Vs1iUdzkB0EA:10 a=COk6AnOGAAAA:8 a=Lm6deZJNLIjBs02OztQA:9 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-GUID: AL2Wyn1xM9cxg0cczb4NnxDCxIt-5_k_ 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 suspectscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 clxscore=1015 mlxlogscore=999 impostorscore=0 phishscore=0 mlxscore=0 spamscore=0 bulkscore=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 In case of notifying SND platform drivers of connection events, some of these use cases, such as offloading, require an ASoC USB backend device to be initialized before the events can be handled. If the USB backend device has not yet been probed, this leads to missing initial USB audio device connection events. Expose an API that traverses the usb_chip array for connected devices, and to call the respective connection callback registered to the SND platform driver. Signed-off-by: Wesley Cheng --- sound/usb/card.c | 21 +++++++++++++++++++++ sound/usb/card.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/sound/usb/card.c b/sound/usb/card.c index 4ac7f2b8309a..9fb8726a6c93 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -155,6 +155,27 @@ int snd_usb_unregister_platform_ops(void) } EXPORT_SYMBOL_GPL(snd_usb_unregister_platform_ops); +/* + * in case the platform driver was not ready at the time of USB SND + * device connect, expose an API to discover all connected USB devices + * so it can populate any dependent resources/structures. + */ +void snd_usb_rediscover_devices(void) +{ + int i; + + guard(mutex)(®ister_mutex); + + if (!platform_ops || !platform_ops->connect_cb) + return; + + for (i = 0; i < SNDRV_CARDS; i++) { + if (usb_chip[i]) + platform_ops->connect_cb(usb_chip[i]); + } +} +EXPORT_SYMBOL_GPL(snd_usb_rediscover_devices); + /* * Checks to see if requested audio profile, i.e sample rate, # of * channels, etc... is supported by the substream associated to the diff --git a/sound/usb/card.h b/sound/usb/card.h index d8b8522e1613..94404c24d240 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -222,4 +222,6 @@ snd_usb_find_suppported_substream(int card_idx, struct snd_pcm_hw_params *params int snd_usb_register_platform_ops(struct snd_usb_platform_ops *ops); int snd_usb_unregister_platform_ops(void); + +void snd_usb_rediscover_devices(void); #endif /* __USBAUDIO_CARD_H */