cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ctljack.c (2053B)

      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	strscpy(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}