From patchwork Tue Jul 25 06:22:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 706578 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39507C001DF for ; Tue, 25 Jul 2023 06:22:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231431AbjGYGWY (ORCPT ); Tue, 25 Jul 2023 02:22:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231640AbjGYGWS (ORCPT ); Tue, 25 Jul 2023 02:22:18 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26BB81990; Mon, 24 Jul 2023 23:22:14 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id BECB81F8B4; Tue, 25 Jul 2023 06:22:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1690266132; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oArbKxaeZCPtqMVbiTY1Kkik4trkyVoAFJEqdy+srBU=; b=2Ig4JsL/QSHJg3WDWvvrzuyGDYCR18LMLIt57WwZyLoTCo1GgcY7Xzy7f2AyB986CNYRxs CHwg6Z+t2ZGgJIdZeq/g3bvdkaW48M8CxDDyrkjNL8x3yFTOzGriyPYhKSWri7jfdn7FzI 98m6R867vuat2R/nZI11btxhP7/3dGM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1690266132; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oArbKxaeZCPtqMVbiTY1Kkik4trkyVoAFJEqdy+srBU=; b=xDjJ4JW01JxO/FJbwOQOcph3kuzi6/7sya8pmT73vBkumw52evG5v2znOBlSqF7R9s38Z5 h/NBePTu1WYBIaAQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 990DF13342; Tue, 25 Jul 2023 06:22:12 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id CB5+JBRqv2S0dQAAMHmgww (envelope-from ); Tue, 25 Jul 2023 06:22:12 +0000 From: Takashi Iwai To: Greg Kroah-Hartman Cc: alsa-devel@alsa-project.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 6/7] usb: gadget: midi2: Add "Operation Mode" control Date: Tue, 25 Jul 2023 08:22:05 +0200 Message-Id: <20230725062206.9674-7-tiwai@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230725062206.9674-1-tiwai@suse.de> References: <20230725062206.9674-1-tiwai@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add a new ALSA control element to watch the current operation mode (MIDI 1.0 or MIDI 2.0). It's a read-only control that reflects the current value of altsetting, and 0 means unused, 1 for MIDI 1.0 (altset 0) and 2 for MIDI 2.0 (altset 1). Signed-off-by: Takashi Iwai --- Documentation/usb/gadget-testing.rst | 11 +++++++++ drivers/usb/gadget/function/f_midi2.c | 35 +++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst index 0f3708ae5bc8..1fb181d61322 100644 --- a/Documentation/usb/gadget-testing.rst +++ b/Documentation/usb/gadget-testing.rst @@ -1106,3 +1106,14 @@ On the host:: The access to MIDI 1.0 on altset 0 on the host is supported, and it's translated from/to UMP packets on the gadget. It's bound to only Function Block 0. + +The current operation mode can be observed in ALSA control element +"Operation Mode" for SND_CTL_IFACE_RAWMIDI. For example:: + + $ amixer -c1 contents + numid=1,iface=RAWMIDI,name='Operation Mode' + ; type=INTEGER,access=r--v----,values=1,min=0,max=2,step=0 + : values=2 + +where 0 = unused, 1 = MIDI 1.0 (altset 0), 2 = MIDI 2.0 (altset 1). +The example above shows it's running in 2, i.e. MIDI 2.0. diff --git a/drivers/usb/gadget/function/f_midi2.c b/drivers/usb/gadget/function/f_midi2.c index a368ac51d349..ec9ef15abfea 100644 --- a/drivers/usb/gadget/function/f_midi2.c +++ b/drivers/usb/gadget/function/f_midi2.c @@ -9,6 +9,7 @@ #include #include +#include #include #include #include @@ -1450,6 +1451,36 @@ static const struct snd_ump_ops f_midi2_ump_ops = { .drain = f_midi2_ump_drain, }; +/* + * "Operation Mode" control element + */ +static int f_midi2_operation_mode_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 1; + uinfo->value.integer.min = MIDI_OP_MODE_UNSET; + uinfo->value.integer.max = MIDI_OP_MODE_MIDI2; + return 0; +} + +static int f_midi2_operation_mode_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct f_midi2 *midi2 = snd_kcontrol_chip(kcontrol); + + ucontrol->value.integer.value[0] = midi2->operation_mode; + return 0; +} + +static const struct snd_kcontrol_new operation_mode_ctl = { + .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI, + .name = "Operation Mode", + .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, + .info = f_midi2_operation_mode_info, + .get = f_midi2_operation_mode_get, +}; + /* * ALSA UMP instance creation / deletion */ @@ -1547,6 +1578,10 @@ static int f_midi2_create_card(struct f_midi2 *midi2) id++; } + err = snd_ctl_add(card, snd_ctl_new1(&operation_mode_ctl, midi2)); + if (err < 0) + goto error; + err = snd_card_register(card); if (err < 0) goto error;