2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Helper functions for jack-detection kcontrols
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*
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* Copyright (c) 2011 Takashi Iwai <tiwai@suse.de>
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#define jack_detect_kctl_info snd_ctl_boolean_mono_info
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static int jack_detect_kctl_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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ucontrol->value.integer.value[0] = kcontrol->private_value;
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return 0;
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}
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static const struct snd_kcontrol_new jack_detect_kctl = {
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/* name is filled later */
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.iface = SNDRV_CTL_ELEM_IFACE_CARD,
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.access = SNDRV_CTL_ELEM_ACCESS_READ,
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.info = jack_detect_kctl_info,
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.get = jack_detect_kctl_get,
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};
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static int get_available_index(struct snd_card *card, const char *name)
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{
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struct snd_ctl_elem_id sid;
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memset(&sid, 0, sizeof(sid));
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sid.index = 0;
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sid.iface = SNDRV_CTL_ELEM_IFACE_CARD;
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strlcpy(sid.name, name, sizeof(sid.name));
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while (snd_ctl_find_id(card, &sid)) {
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sid.index++;
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/* reset numid; otherwise snd_ctl_find_id() hits this again */
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sid.numid = 0;
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}
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return sid.index;
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}
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static void jack_kctl_name_gen(char *name, const char *src_name, int size)
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{
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size_t count = strlen(src_name);
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bool need_cat = true;
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/* remove redundant " Jack" from src_name */
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if (count >= 5)
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need_cat = strncmp(&src_name[count - 5], " Jack", 5) ? true : false;
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snprintf(name, size, need_cat ? "%s Jack" : "%s", src_name);
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}
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struct snd_kcontrol *
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snd_kctl_jack_new(const char *name, struct snd_card *card)
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{
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struct snd_kcontrol *kctl;
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kctl = snd_ctl_new1(&jack_detect_kctl, NULL);
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if (!kctl)
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return NULL;
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jack_kctl_name_gen(kctl->id.name, name, sizeof(kctl->id.name));
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kctl->id.index = get_available_index(card, kctl->id.name);
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kctl->private_value = 0;
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return kctl;
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}
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void snd_kctl_jack_report(struct snd_card *card,
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struct snd_kcontrol *kctl, bool status)
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{
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if (kctl->private_value == status)
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return;
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kctl->private_value = status;
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
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}
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