1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Helper functions for jack-detection kcontrols
 4 *
 5 * Copyright (c) 2011 Takashi Iwai <tiwai@suse.de>
 
 
 
 
 
 6 */
 7
 8#include <linux/kernel.h>
 9#include <linux/export.h>
10#include <sound/core.h>
11#include <sound/control.h>
12
13#define jack_detect_kctl_info	snd_ctl_boolean_mono_info
14
15static int jack_detect_kctl_get(struct snd_kcontrol *kcontrol,
16				struct snd_ctl_elem_value *ucontrol)
17{
18	ucontrol->value.integer.value[0] = kcontrol->private_value;
19	return 0;
20}
21
22static const struct snd_kcontrol_new jack_detect_kctl = {
23	/* name is filled later */
24	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
25	.access = SNDRV_CTL_ELEM_ACCESS_READ,
26	.info = jack_detect_kctl_info,
27	.get = jack_detect_kctl_get,
28};
29
30static int get_available_index(struct snd_card *card, const char *name)
31{
32	struct snd_ctl_elem_id sid;
33
34	memset(&sid, 0, sizeof(sid));
35
36	sid.index = 0;
37	sid.iface = SNDRV_CTL_ELEM_IFACE_CARD;
38	strlcpy(sid.name, name, sizeof(sid.name));
39
40	while (snd_ctl_find_id(card, &sid)) {
41		sid.index++;
42		/* reset numid; otherwise snd_ctl_find_id() hits this again */
43		sid.numid = 0;
44	}
45
46	return sid.index;
47}
48
49static void jack_kctl_name_gen(char *name, const char *src_name, int size)
50{
51	size_t count = strlen(src_name);
52	bool need_cat = true;
53
54	/* remove redundant " Jack" from src_name */
55	if (count >= 5)
56		need_cat = strncmp(&src_name[count - 5], " Jack", 5) ? true : false;
57
58	snprintf(name, size, need_cat ? "%s Jack" : "%s", src_name);
59
60}
61
62struct snd_kcontrol *
63snd_kctl_jack_new(const char *name, struct snd_card *card)
64{
65	struct snd_kcontrol *kctl;
66
67	kctl = snd_ctl_new1(&jack_detect_kctl, NULL);
68	if (!kctl)
69		return NULL;
70
71	jack_kctl_name_gen(kctl->id.name, name, sizeof(kctl->id.name));
72	kctl->id.index = get_available_index(card, kctl->id.name);
73	kctl->private_value = 0;
74	return kctl;
75}
 
76
77void snd_kctl_jack_report(struct snd_card *card,
78			  struct snd_kcontrol *kctl, bool status)
79{
80	if (kctl->private_value == status)
81		return;
82	kctl->private_value = status;
83	snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
84}

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