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Thu, 27 Feb 2025 07:01:39 +0000 Date: Thu, 27 Feb 2025 08:01:38 +0100 Message-ID: <87a5a73m7h.wl-tiwai@suse.de> From: Takashi Iwai To: Lena Cc: alsa-devel@alsa-project.org Subject: Re: ALSA USB quirk mixer driver question In-Reply-To: <527b73fe-892f-476e-95e7-7c0cd09df1d0@nihil.gay> References: <6f03b7d6-97d5-48a4-be6f-a1df481971fc@nihil.gay> <87cyf557kv.wl-tiwai@suse.de> <527b73fe-892f-476e-95e7-7c0cd09df1d0@nihil.gay> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: 8A27E1F38A X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; 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max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Thu, 27 Feb 2025 00:15:01 +0100, Lena wrote: > > Thanks for the reply! > > So, if i understand correctly, instead of going through > sound/usb/mixer_quirks.c, i need to create a standalone USBHID driver > that exposes the ALSA kcontrols and then the ALSA userspace > understands that it's the same interface and 'links' the > UAC/isochronous audio part and the standalone ALSA mixer kcontrol part > that has the volume knobs, mute, output select and input > impedance/phantom power/headphone gain switches such that an userspace > application (like alsamixer) treats it all as a single thing. Well, how to manage HID device is other question. Usually a HID device provides the controls via input device API. It's not prohibited to use a sound API (in this case you'd need to create your own sound card object), though. > Does this driver then belong in sound/usb/ (given it imports the API > in ) or somewhere else (e.g. drivers/hid/usbhid/, > drivers/usb/)? Not likely. It'll be a pure HID driver. HTH, Takashi