linux/sound/core/ctljack.c
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   1/*
   2 * Helper functions for jack-detection kcontrols
   3 *
   4 * Copyright (c) 2011 Takashi Iwai <tiwai@suse.de>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the Free
   8 * Software Foundation; either version 2 of the License, or (at your option)
   9 * any later version.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/export.h>
  14#include <sound/core.h>
  15#include <sound/control.h>
  16
  17#define jack_detect_kctl_info   snd_ctl_boolean_mono_info
  18
  19static int jack_detect_kctl_get(struct snd_kcontrol *kcontrol,
  20                                struct snd_ctl_elem_value *ucontrol)
  21{
  22        ucontrol->value.integer.value[0] = kcontrol->private_value;
  23        return 0;
  24}
  25
  26static struct snd_kcontrol_new jack_detect_kctl = {
  27        /* name is filled later */
  28        .iface = SNDRV_CTL_ELEM_IFACE_CARD,
  29        .access = SNDRV_CTL_ELEM_ACCESS_READ,
  30        .info = jack_detect_kctl_info,
  31        .get = jack_detect_kctl_get,
  32};
  33
  34struct snd_kcontrol *
  35snd_kctl_jack_new(const char *name, int idx, void *private_data)
  36{
  37        struct snd_kcontrol *kctl;
  38        kctl = snd_ctl_new1(&jack_detect_kctl, private_data);
  39        if (!kctl)
  40                return NULL;
  41        snprintf(kctl->id.name, sizeof(kctl->id.name), "%s Jack", name);
  42        kctl->id.index = idx;
  43        kctl->private_value = 0;
  44        return kctl;
  45}
  46EXPORT_SYMBOL_GPL(snd_kctl_jack_new);
  47
  48void snd_kctl_jack_report(struct snd_card *card,
  49                          struct snd_kcontrol *kctl, bool status)
  50{
  51        if (kctl->private_value == status)
  52                return;
  53        kctl->private_value = status;
  54        snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
  55}
  56EXPORT_SYMBOL_GPL(snd_kctl_jack_report);
  57
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