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Wed, 19 Feb 2025 00:48:08 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 Feb 2025 16:48:07 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v35 13/31] ALSA: usb-audio: Allow for rediscovery of connected USB SND devices Date: Tue, 18 Feb 2025 16:47:36 -0800 Message-ID: <20250219004754.497985-14-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250219004754.497985-1-quic_wcheng@quicinc.com> References: <20250219004754.497985-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) 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: 34_7dBhoDM3_I6mvUhoUJA2GH1LffcEJ X-Proofpoint-GUID: 34_7dBhoDM3_I6mvUhoUJA2GH1LffcEJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-18_11,2025-02-18_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2502190003 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 */