sound/core/ctljack.c

   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
  19 static 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
  26 static 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
  34 struct snd_kcontrol *
  35 snd_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 }
  46 EXPORT_SYMBOL_GPL(snd_kctl_jack_new);
  47
  48 void 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 }
  56 EXPORT_SYMBOL_GPL(snd_kctl_jack_report);