From patchwork Mon Feb 22 09:15:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaroslav Kysela X-Patchwork-Id: 12098165 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8264C433E0 for ; Mon, 22 Feb 2021 09:18:22 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CFFD964EBE for ; Mon, 22 Feb 2021 09:18:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CFFD964EBE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=perex.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 2D9451696; Mon, 22 Feb 2021 10:17:30 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 2D9451696 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1613985500; bh=96WOUDBwG+tuRo1QcFgVJrBhRDbJg8G+FNeKoD0BkaA=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=PkgyKcvWT+jHWHVESGoH1zu5zzBfTDizc2UqSbqX7z99Rj+li7j8xU93VvnAsaqWq 2gJs9IlLbnse7o3t2c3BnN8Ruu74slykDyWEKURzDGkVBefjYVz2PTsJ2vhkxO9aRR SA4HqP8U1mbGUN8rZOWN3YK4SPc2ThzC7DoPTEZo= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 3F723F8042F; Mon, 22 Feb 2021 10:16:04 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 52CE8F8042F; Mon, 22 Feb 2021 10:16:02 +0100 (CET) Received: from mail1.perex.cz (mail1.perex.cz [77.48.224.245]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 9FF3BF802E0 for ; Mon, 22 Feb 2021 10:15:56 +0100 (CET) Received: from mail1.perex.cz (localhost [127.0.0.1]) by smtp1.perex.cz (Perex's E-mail Delivery System) with ESMTP id 45256A003F; Mon, 22 Feb 2021 10:15:56 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.perex.cz 45256A003F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1613985356; bh=N7pISrYhT1AsQrnti+h7V9ZbZjZzvBWXYX0rC3l+kkc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NKf8YaHNti1jUSScnx16+6xmUsma30dmq4g09HkWIbMphZfqkaH6HcA49YOApIOQ5 cJkjQdM5i0X48qKi7dREFQFeta1xLY7hyJa5JC31clxSvff77MjgIH7YoSvuBcOtIT IPyzwYUggsmUlC/6YjsGRyPQ1xe7UFgXtrMTFejk= Received: from p1gen2.perex-int.cz (unknown [192.168.100.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: perex) by mail1.perex.cz (Perex's E-mail Delivery System) with ESMTPSA; Mon, 22 Feb 2021 10:15:51 +0100 (CET) From: Jaroslav Kysela To: ALSA development Subject: [PATCH v3 3/5] ALSA: control - add generic LED trigger module as the new control layer Date: Mon, 22 Feb 2021 10:15:14 +0100 Message-Id: <20210222091516.1752662-4-perex@perex.cz> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210222091516.1752662-1-perex@perex.cz> References: <20210222091516.1752662-1-perex@perex.cz> MIME-Version: 1.0 Cc: Takashi Iwai , Hans de Goede , Perry Yuan 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" The recent laptops have usually two LEDs assigned to reflect the speaker and microphone mute state. This implementation adds a tiny layer on top of the control API which calculates the state for those LEDs using the driver callbacks. Two new access flags are introduced to describe the controls which affects the audio path settings (an easy code change for drivers). The LED resource can be shared with multiple sound cards with this code. The user space controls may be added to the state chain on demand, too. This code should replace the LED code in the HDA driver and add a possibility to easy extend the other drivers (ASoC codecs etc.). Signed-off-by: Jaroslav Kysela --- include/sound/control.h | 11 ++ include/uapi/sound/asound.h | 6 +- sound/core/Kconfig | 6 + sound/core/Makefile | 2 + sound/core/control.c | 1 + sound/core/control_led.c | 254 ++++++++++++++++++++++++++++++++++++ 6 files changed, 279 insertions(+), 1 deletion(-) create mode 100644 sound/core/control_led.c diff --git a/include/sound/control.h b/include/sound/control.h index 175610bfa8c8..e88f2651fee0 100644 --- a/include/sound/control.h +++ b/include/sound/control.h @@ -265,6 +265,17 @@ int snd_ctl_apply_vmaster_followers(struct snd_kcontrol *kctl, void *arg), void *arg); +/* + * Control LED trigger layer + */ +#define SND_CTL_LAYER_MODULE_LED "snd-ctl-led" + +#if IS_MODULE(CONFIG_SND_CTL_LED) +static inline int snd_ctl_led_request(void) { return snd_ctl_request_layer(SND_CTL_LAYER_MODULE_LED); } +#else +static inline int snd_ctl_led_request(void) { return 0; } +#endif + /* * Helper functions for jack-detection controls */ diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..a1aff0a8ec31 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -936,7 +936,7 @@ struct snd_timer_tread { * * ****************************************************************************/ -#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 8) +#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 9) struct snd_ctl_card_info { int card; /* card number */ @@ -982,6 +982,10 @@ typedef int __bitwise snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_ACCESS_INACTIVE (1<<8) /* control does actually nothing, but may be updated */ #define SNDRV_CTL_ELEM_ACCESS_LOCK (1<<9) /* write lock */ #define SNDRV_CTL_ELEM_ACCESS_OWNER (1<<10) /* write lock owner */ +#define SNDRV_CTL_ELEM_ACCESS_LED_SHIFT 11 +#define SNDRV_CTL_ELEM_ACCESS_LED_MASK (7<<11) /* three bits - LED group */ +#define SNDRV_CTL_ELEM_ACCESS_SPK_LED (1<<11) /* speaker (output) LED flag */ +#define SNDRV_CTL_ELEM_ACCESS_MIC_LED (2<<11) /* microphone (input) LED flag */ #define SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK (1<<28) /* kernel use a TLV callback */ #define SNDRV_CTL_ELEM_ACCESS_USER (1<<29) /* user space element */ /* bits 30 and 31 are obsoleted (for indirect access) */ diff --git a/sound/core/Kconfig b/sound/core/Kconfig index a4050f87f230..db2e3c63ff41 100644 --- a/sound/core/Kconfig +++ b/sound/core/Kconfig @@ -203,4 +203,10 @@ config SND_DMA_SGBUF def_bool y depends on X86 +config SND_CTL_LED + tristate + select NEW_LEDS if SND_CTL_LED + select LEDS_TRIGGERS if SND_CTL_LED + select LEDS_TRIGGER_AUDIO if SND_CTL_LED + source "sound/core/seq/Kconfig" diff --git a/sound/core/Makefile b/sound/core/Makefile index ee4a4a6b99ba..d774792850f3 100644 --- a/sound/core/Makefile +++ b/sound/core/Makefile @@ -27,6 +27,7 @@ CFLAGS_pcm_native.o := -I$(src) snd-pcm-dmaengine-objs := pcm_dmaengine.o +snd-ctl-led-objs := control_led.o snd-rawmidi-objs := rawmidi.o snd-timer-objs := timer.o snd-hrtimer-objs := hrtimer.o @@ -37,6 +38,7 @@ snd-seq-device-objs := seq_device.o snd-compress-objs := compress_offload.o obj-$(CONFIG_SND) += snd.o +obj-$(CONFIG_SND_CTL_LED) += snd-ctl-led.o obj-$(CONFIG_SND_HWDEP) += snd-hwdep.o obj-$(CONFIG_SND_TIMER) += snd-timer.o obj-$(CONFIG_SND_HRTIMER) += snd-hrtimer.o diff --git a/sound/core/control.c b/sound/core/control.c index 87630021e434..494f0154e8be 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -278,6 +278,7 @@ struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK | + SNDRV_CTL_ELEM_ACCESS_LED_MASK | SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK); err = snd_ctl_new(&kctl, count, access, NULL); diff --git a/sound/core/control_led.c b/sound/core/control_led.c new file mode 100644 index 000000000000..54b0bef2a77f --- /dev/null +++ b/sound/core/control_led.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LED state routines for driver control interface + * Copyright (c) 2021 by Jaroslav Kysela + */ + +#include +#include +#include +#include +#include + +MODULE_AUTHOR("Jaroslav Kysela "); +MODULE_DESCRIPTION("ALSA control interface to LED trigger code."); +MODULE_LICENSE("GPL"); + +#define MAX_LED (((SNDRV_CTL_ELEM_ACCESS_MIC_LED - SNDRV_CTL_ELEM_ACCESS_SPK_LED) \ + >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) + 1) + +struct snd_ctl_led { + struct list_head list; + struct snd_card *card; + struct snd_kcontrol *kctl; + unsigned int index_offset; +}; + +static DEFINE_MUTEX(snd_ctl_led_mutex); +static struct list_head snd_ctl_led_controls[MAX_LED]; +static bool snd_ctl_led_card_valid[SNDRV_CARDS]; + +#define UPDATE_ROUTE(route, cb) \ + do { \ + int route2 = (cb); \ + if (route2 >= 0) \ + route = route < 0 ? route2 : (route | route2); \ + } while (0) + +static inline unsigned int access_to_group(unsigned int access) +{ + return ((access & SNDRV_CTL_ELEM_ACCESS_LED_MASK) >> + SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1; +} + +static inline unsigned int group_to_access(unsigned int group) +{ + return (group + 1) << SNDRV_CTL_ELEM_ACCESS_LED_SHIFT; +} + +static struct list_head *snd_ctl_led_controls_by_access(unsigned int access) +{ + unsigned int group = access_to_group(access); + if (group >= MAX_LED) + return NULL; + return &snd_ctl_led_controls[group]; +} + +static int snd_ctl_led_get(struct snd_ctl_led *lctl) +{ + struct snd_kcontrol *kctl = lctl->kctl; + struct snd_ctl_elem_info info; + struct snd_ctl_elem_value value; + unsigned int i; + int result; + + memset(&info, 0, sizeof(info)); + info.id = kctl->id; + info.id.index += lctl->index_offset; + info.id.numid += lctl->index_offset; + result = kctl->info(kctl, &info); + if (result < 0) + return -1; + memset(&value, 0, sizeof(value)); + value.id = info.id; + result = kctl->get(kctl, &value); + if (result < 0) + return -1; + if (info.type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || + info.type == SNDRV_CTL_ELEM_TYPE_INTEGER) { + for (i = 0; i < info.count; i++) + if (value.value.integer.value[i] != info.value.integer.min) + return 1; + } else if (info.type == SNDRV_CTL_ELEM_TYPE_INTEGER64) { + for (i = 0; i < info.count; i++) + if (value.value.integer64.value[i] != info.value.integer64.min) + return 1; + } + return 0; +} + +static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access, + struct snd_kcontrol *kctl, unsigned int ioff) +{ + struct list_head *controls; + struct snd_ctl_led *lctl; + enum led_audio led_trigger_type; + int route; + bool found; + + controls = snd_ctl_led_controls_by_access(access); + if (!controls) + return; + if (access == SNDRV_CTL_ELEM_ACCESS_SPK_LED) { + led_trigger_type = LED_AUDIO_MUTE; + } else if (access == SNDRV_CTL_ELEM_ACCESS_MIC_LED) { + led_trigger_type = LED_AUDIO_MICMUTE; + } else { + return; + } + route = -1; + found = false; + mutex_lock(&snd_ctl_led_mutex); + /* the card may not be registered (active) at this point */ + if (card && !snd_ctl_led_card_valid[card->number]) { + mutex_unlock(&snd_ctl_led_mutex); + return; + } + list_for_each_entry(lctl, controls, list) { + if (lctl->kctl == kctl && lctl->index_offset == ioff) + found = true; + UPDATE_ROUTE(route, snd_ctl_led_get(lctl)); + } + if (!found && kctl && card) { + lctl = kzalloc(sizeof(*lctl), GFP_KERNEL); + if (lctl) { + lctl->card = card; + lctl->kctl = kctl; + lctl->index_offset = ioff; + list_add(&lctl->list, controls); + UPDATE_ROUTE(route, snd_ctl_led_get(lctl)); + } + } + mutex_unlock(&snd_ctl_led_mutex); + if (route >= 0) + ledtrig_audio_set(led_trigger_type, route ? LED_OFF : LED_ON); +} + +static void snd_ctl_led_remove(struct snd_kcontrol *kctl, unsigned int ioff) +{ + struct snd_kcontrol_volatile *vd; + struct list_head *controls; + struct snd_ctl_led *lctl; + + vd = &kctl->vd[ioff]; + controls = snd_ctl_led_controls_by_access(vd->access); + if (!controls) + return; + mutex_lock(&snd_ctl_led_mutex); + list_for_each_entry(lctl, controls, list) + if (lctl->kctl == kctl && lctl->index_offset == ioff) { + list_del(&lctl->list); + kfree(lctl); + break; + } + mutex_unlock(&snd_ctl_led_mutex); +} + +static void snd_ctl_led_notify(struct snd_card *card, unsigned int mask, + struct snd_kcontrol *kctl, unsigned int ioff) +{ + if (mask == SNDRV_CTL_EVENT_MASK_REMOVE) { + snd_ctl_led_remove(kctl, ioff); + } else if ((mask & (SNDRV_CTL_EVENT_MASK_INFO | + SNDRV_CTL_EVENT_MASK_ADD | + SNDRV_CTL_EVENT_MASK_VALUE)) != 0) { + struct snd_kcontrol_volatile *vd = &kctl->vd[ioff]; + unsigned int access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK; + if (access) + snd_ctl_led_set_state(card, access, kctl, ioff); + else if ((mask & SNDRV_CTL_EVENT_MASK_INFO) != 0) + snd_ctl_led_remove(kctl, ioff); + } +} + +static void snd_ctl_led_refresh(void) +{ + unsigned int group; + + for (group = 0; group < MAX_LED; group++) + snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0); +} + +static void snd_ctl_led_clean(struct snd_card *card) +{ + unsigned int group; + struct list_head *controls; + struct snd_ctl_led *lctl; + + for (group = 0; group < MAX_LED; group++) { + controls = &snd_ctl_led_controls[group]; +repeat: + list_for_each_entry(lctl, controls, list) + if (!card || lctl->card == card) { + list_del(&lctl->list); + kfree(lctl); + goto repeat; + } + } +} + +static void snd_ctl_led_register(struct snd_card *card) +{ + struct snd_kcontrol *kctl; + unsigned int ioff; + + if (snd_BUG_ON(card->number < 0 || + card->number >= ARRAY_SIZE(snd_ctl_led_card_valid))) + return; + mutex_lock(&snd_ctl_led_mutex); + snd_ctl_led_card_valid[card->number] = true; + mutex_unlock(&snd_ctl_led_mutex); + /* the register callback is already called with held card->controls_rwsem */ + list_for_each_entry(kctl, &card->controls, list) + for (ioff = 0; ioff < kctl->count; ioff++) + snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, kctl, ioff); + snd_ctl_led_refresh(); +} + +static void snd_ctl_led_disconnect(struct snd_card *card) +{ + mutex_lock(&snd_ctl_led_mutex); + snd_ctl_led_card_valid[card->number] = false; + snd_ctl_led_clean(card); + mutex_unlock(&snd_ctl_led_mutex); + snd_ctl_led_refresh(); +} + +/* + * Control layer registration + */ +static struct snd_ctl_layer_ops snd_ctl_led_lops = { + .module_name = SND_CTL_LAYER_MODULE_LED, + .lregister = snd_ctl_led_register, + .ldisconnect = snd_ctl_led_disconnect, + .lnotify = snd_ctl_led_notify, +}; + +static int __init snd_ctl_led_init(void) +{ + unsigned int group; + + for (group = 0; group < MAX_LED; group++) + INIT_LIST_HEAD(&snd_ctl_led_controls[group]); + snd_ctl_register_layer(&snd_ctl_led_lops); + return 0; +} + +static void __exit snd_ctl_led_exit(void) +{ + snd_ctl_disconnect_layer(&snd_ctl_led_lops); + snd_ctl_led_clean(NULL); +} + +module_init(snd_ctl_led_init) +module_exit(snd_ctl_led_exit)