// SPDX-License-Identifier: GPL-2.0-or-later/* * Helper functions for jack-detection kcontrols * * Copyright (c) 2011 Takashi Iwai <tiwai@suse.de> */ #include <linux/kernel.h>#include <linux/export.h>#include <linux/string.h>#include <sound/core.h>#include <sound/control.h> #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 const 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,}; static int get_available_index(struct snd_card *card, const char *name){	struct snd_ctl_elem_id sid; 	memset(&sid, 0, sizeof(sid)); 	sid.index = 0;	sid.iface = SNDRV_CTL_ELEM_IFACE_CARD;	strscpy(sid.name, name, sizeof(sid.name)); 	while (snd_ctl_find_id(card, &sid)) {		sid.index++;		/* reset numid; otherwise snd_ctl_find_id() hits this again */		sid.numid = 0;	} 	return sid.index;} static void jack_kctl_name_gen(char *name, const char *src_name, size_t size){	size_t count = strlen(src_name);	const char *suf = " Jack";	size_t suf_len = strlen(suf);	bool append_suf = true; 	if (count >= suf_len)		append_suf = strncmp(&src_name[count - suf_len], suf, suf_len) != 0; 	if (append_suf)		snprintf(name, size, "%s%s", src_name, suf);	else		strscpy(name, src_name, size);} struct snd_kcontrol *snd_kctl_jack_new(const char *name, struct snd_card *card){	struct snd_kcontrol *kctl; 	kctl = snd_ctl_new1(&jack_detect_kctl, NULL);	if (!kctl)		return NULL; 	jack_kctl_name_gen(kctl->id.name, name, sizeof(kctl->id.name));	kctl->id.index = get_available_index(card, kctl->id.name);	kctl->private_value = 0;	return kctl;} 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);}