From 35be544af367170a9c6bf63adcf9d0cb2d569dbb Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 2 Nov 2011 08:36:06 +0100 Subject: ALSA: Introduce common helper functions for jack-detection control Now move the helper function for creating and reporting the jack-detection to the common place. The driver that needs this functionality should select CONFIG_SND_KCTL_JACK kconfig. Signed-off-by: Takashi Iwai --- sound/core/ctljack.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 sound/core/ctljack.c (limited to 'sound/core/ctljack.c') diff --git a/sound/core/ctljack.c b/sound/core/ctljack.c new file mode 100644 index 000000000000..af0e78a3809c --- /dev/null +++ b/sound/core/ctljack.c @@ -0,0 +1,55 @@ +/* + * Helper functions for jack-detection kcontrols + * + * Copyright (c) 2011 Takashi Iwai + * + * 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 +#include +#include + +#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); -- cgit v1.2.3