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 | |
15 | static 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 | |
22 | static 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 | |
30 | static 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 | strscpy(p: sid.name, q: name, size: sizeof(sid.name)); |
39 | |
40 | while (snd_ctl_find_id(card, id: &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 | |
49 | static 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(buf: name, size, fmt: need_cat ? "%s Jack" : "%s" , src_name); |
59 | |
60 | } |
61 | |
62 | struct snd_kcontrol * |
63 | snd_kctl_jack_new(const char *name, struct snd_card *card) |
64 | { |
65 | struct snd_kcontrol *kctl; |
66 | |
67 | kctl = snd_ctl_new1(kcontrolnew: &jack_detect_kctl, NULL); |
68 | if (!kctl) |
69 | return NULL; |
70 | |
71 | jack_kctl_name_gen(name: kctl->id.name, src_name: name, size: sizeof(kctl->id.name)); |
72 | kctl->id.index = get_available_index(card, name: kctl->id.name); |
73 | kctl->private_value = 0; |
74 | return kctl; |
75 | } |
76 | |
77 | void 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, id: &kctl->id); |
84 | } |
85 | |