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https://github.com/torvalds/linux
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35be544af3
Now move the helper function for creating and reporting the jack-detection to the common place. The driver that needs this functionality should select CONFIG_SND_KCTL_JACK kconfig. Signed-off-by: Takashi Iwai <tiwai@suse.de>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/kernel.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 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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struct snd_kcontrol *
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snd_kctl_jack_new(const char *name, int idx, void *private_data)
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{
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struct snd_kcontrol *kctl;
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kctl = snd_ctl_new1(&jack_detect_kctl, private_data);
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if (!kctl)
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return NULL;
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snprintf(kctl->id.name, sizeof(kctl->id.name), "%s Jack", name);
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kctl->id.index = idx;
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kctl->private_value = 0;
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return kctl;
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}
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EXPORT_SYMBOL_GPL(snd_kctl_jack_new);
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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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EXPORT_SYMBOL_GPL(snd_kctl_jack_report);
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