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[172.101.252.194]) by smtp.gmail.com with ESMTPSA id q24sm7969363qtk.45.2020.03.14.09.54.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Mar 2020 09:54:17 -0700 (PDT) From: crwulff@gmail.com To: patch@alsa-project.org Subject: [PATCH Fix for Kingston HyperX Amp (0951:16d8) (Try #2) 2/2] snd-usb-audio: Create a registration quirk Date: Sat, 14 Mar 2020 12:54:49 -0400 Message-Id: <20200314165449.4086-3-crwulff@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200314165449.4086-1-crwulff@gmail.com> References: <20200314165449.4086-1-crwulff@gmail.com> MIME-Version: 1.0 X-Mailman-Approved-At: Sun, 15 Mar 2020 09:32:59 +0100 Cc: tiwai@suse.de, alsa-devel@alsa-project.org, Chris Wulff X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Chris Wulff Create a quirk that allows special processing and/or skipping the call to snd_card_register. For HyperX AMP, which uses two interfaces, but only has a capture stream in the second, this allows the capture stream to merge with the first PCM. Signed-off-by: Chris Wulff diff --git a/sound/usb/card.c b/sound/usb/card.c index 827fb0bc8b56..16bbe2a50fb7 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -662,10 +662,14 @@ static int usb_audio_probe(struct usb_interface *intf, goto __error; } - /* we are allowed to call snd_card_register() many times */ - err = snd_card_register(chip->card); - if (err < 0) - goto __error; + /* we are allowed to call snd_card_register() many times, but first + * check to see if a device needs to skip it or do anything special + */ + if (snd_usb_registration_quirk(chip, ifnum) == 0) { + err = snd_card_register(chip->card); + if (err < 0) + goto __error; + } if (quirk && quirk->shares_media_device) { /* don't want to fail when snd_media_device_create() fails */ diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 7f558f4b4520..c73da0721e30 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1756,3 +1756,17 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip, break; } } + +int snd_usb_registration_quirk(struct snd_usb_audio *chip, + int iface) +{ + switch (chip->usb_id) { + case USB_ID(0x0951, 0x16d8): /* Kingston HyperX AMP */ + /* Register only when we reach interface 2 so that streams can + * merge correctly into PCMs from interface 0 + */ + return (iface != 2); + } + /* Register as normal */ + return 0; +} diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h index df0355843a4c..3afc01eabc7e 100644 --- a/sound/usb/quirks.h +++ b/sound/usb/quirks.h @@ -51,4 +51,7 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip, struct audioformat *fp, int stream); +int snd_usb_registration_quirk(struct snd_usb_audio *chip, + int iface); + #endif /* __USBAUDIO_QUIRKS_H */