ctljack.c

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/*
 * Helper functions for jack-detection kcontrols
 *
 * Copyright (c) 2011 Takashi Iwai <[email protected]>
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/control.h>

#define jack_detect_kctl_info   snd_ctl_boolean_mono_info

static int jack_detect_kctl_get(struct snd_kcontrol *kcontrol,
                struct snd_ctl_elem_value *ucontrol)
{
    ucontrol->value.integer.value[0] = kcontrol->private_value;
    return 0;
}

static struct snd_kcontrol_new jack_detect_kctl = {
    /* name is filled later */
    .iface = SNDRV_CTL_ELEM_IFACE_CARD,
    .access = SNDRV_CTL_ELEM_ACCESS_READ,
    .info = jack_detect_kctl_info,
    .get = jack_detect_kctl_get,
};

struct snd_kcontrol *
snd_kctl_jack_new(const char *name, int idx, void *private_data)
{
    struct snd_kcontrol *kctl;
    kctl = snd_ctl_new1(&jack_detect_kctl, private_data);
    if (!kctl)
        return NULL;
    snprintf(kctl->id.name, sizeof(kctl->id.name), "%s Jack", name);
    kctl->id.index = idx;
    kctl->private_value = 0;
    return kctl;
}
EXPORT_SYMBOL_GPL(snd_kctl_jack_new);

void snd_kctl_jack_report(struct snd_card *card,
              struct snd_kcontrol *kctl, bool status)
{
    if (kctl->private_value == status)
        return;
    kctl->private_value = status;
    snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
}
EXPORT_SYMBOL_GPL(snd_kctl_jack_report);