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https://github.com/edk2-porting/linux-next.git
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7378bc2f19
While the commit [d0a601c278: ALSA: jack: Fix the id uniqueness
check] fixes the wrong string check, it leads to a worse result -- the
loop in get_available_index() goes into an endless loop. The cause is
that snd_ctl_find_id() returns the object assigned to the numid if
it's set. Thus it points to the previous entry again.
This patch clears the numid field for the next call properly.
Reported-and-tested-by: Tomáš Pružina <pruzinat@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* Helper functions for jack-detection kcontrols
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*
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* Copyright (c) 2011 Takashi Iwai <tiwai@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#define jack_detect_kctl_info snd_ctl_boolean_mono_info
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static int jack_detect_kctl_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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ucontrol->value.integer.value[0] = kcontrol->private_value;
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return 0;
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}
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static struct snd_kcontrol_new jack_detect_kctl = {
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/* name is filled later */
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.iface = SNDRV_CTL_ELEM_IFACE_CARD,
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.access = SNDRV_CTL_ELEM_ACCESS_READ,
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.info = jack_detect_kctl_info,
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.get = jack_detect_kctl_get,
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};
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static int get_available_index(struct snd_card *card, const char *name)
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{
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struct snd_ctl_elem_id sid;
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memset(&sid, 0, sizeof(sid));
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sid.index = 0;
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sid.iface = SNDRV_CTL_ELEM_IFACE_CARD;
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strlcpy(sid.name, name, sizeof(sid.name));
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while (snd_ctl_find_id(card, &sid)) {
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sid.index++;
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/* reset numid; otherwise snd_ctl_find_id() hits this again */
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sid.numid = 0;
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}
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return sid.index;
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}
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static void jack_kctl_name_gen(char *name, const char *src_name, int size)
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{
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size_t count = strlen(src_name);
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bool need_cat = true;
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/* remove redundant " Jack" from src_name */
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if (count >= 5)
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need_cat = strncmp(&src_name[count - 5], " Jack", 5) ? true : false;
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snprintf(name, size, need_cat ? "%s Jack" : "%s", src_name);
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}
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struct snd_kcontrol *
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snd_kctl_jack_new(const char *name, struct snd_card *card)
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{
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struct snd_kcontrol *kctl;
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kctl = snd_ctl_new1(&jack_detect_kctl, NULL);
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if (!kctl)
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return NULL;
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jack_kctl_name_gen(kctl->id.name, name, sizeof(kctl->id.name));
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kctl->id.index = get_available_index(card, kctl->id.name);
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kctl->private_value = 0;
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return kctl;
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}
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void snd_kctl_jack_report(struct snd_card *card,
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struct snd_kcontrol *kctl, bool status)
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{
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if (kctl->private_value == status)
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return;
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kctl->private_value = status;
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
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}
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