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 19 static 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 26 static 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 34 static int get_available_index(struct snd_card *card, const char *name) 35 { 36 struct snd_ctl_elem_id sid; 37 38 memset(&sid, 0, sizeof(sid)); 39 40 sid.index = 0; 41 sid.iface = SNDRV_CTL_ELEM_IFACE_CARD; 42 strlcpy(sid.name, name, sizeof(sid.name)); 43 44 while (snd_ctl_find_id(card, &sid)) { 45 sid.index++; 46 /* reset numid; otherwise snd_ctl_find_id() hits this again */ 47 sid.numid = 0; 48 } 49 50 return sid.index; 51 } 52 53 static void jack_kctl_name_gen(char *name, const char *src_name, int size) 54 { 55 size_t count = strlen(src_name); 56 bool need_cat = true; 57 58 /* remove redundant " Jack" from src_name */ 59 if (count >= 5) 60 need_cat = strncmp(&src_name[count - 5], " Jack", 5) ? true : false; 61 62 snprintf(name, size, need_cat ? "%s Jack" : "%s", src_name); 63 64 } 65 66 struct snd_kcontrol * 67 snd_kctl_jack_new(const char *name, struct snd_card *card) 68 { 69 struct snd_kcontrol *kctl; 70 71 kctl = snd_ctl_new1(&jack_detect_kctl, NULL); 72 if (!kctl) 73 return NULL; 74 75 jack_kctl_name_gen(kctl->id.name, name, sizeof(kctl->id.name)); 76 kctl->id.index = get_available_index(card, kctl->id.name); 77 kctl->private_value = 0; 78 return kctl; 79 } 80 81 void snd_kctl_jack_report(struct snd_card *card, 82 struct snd_kcontrol *kctl, bool status) 83 { 84 if (kctl->private_value == status) 85 return; 86 kctl->private_value = status; 87 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id); 88 } 89