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