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TOMOYO Linux Cross Reference
Linux/sound/core/ctljack.c

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  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         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 
 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(name, size, 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(&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 
 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, &kctl->id);
 84 }
 85 

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