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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 
 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);
 57 

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