mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 07:44:21 +08:00
2eccd40803
Most of snd_kcontrol_new definitions are read-only and passed as-is. Let's declare them as const for further optimization. Constify snd_kcontrol_new items There should be no functional changes by this patch. Link: https://lore.kernel.org/r/20200103081714.9560-34-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* OPL4 mixer functions
|
|
* Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
|
|
*/
|
|
|
|
#include "opl4_local.h"
|
|
#include <sound/control.h>
|
|
|
|
static int snd_opl4_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
|
|
{
|
|
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
|
|
uinfo->count = 2;
|
|
uinfo->value.integer.min = 0;
|
|
uinfo->value.integer.max = 7;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_opl4_ctl_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
|
|
{
|
|
struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
|
|
unsigned long flags;
|
|
u8 reg = kcontrol->private_value;
|
|
u8 value;
|
|
|
|
spin_lock_irqsave(&opl4->reg_lock, flags);
|
|
value = snd_opl4_read(opl4, reg);
|
|
spin_unlock_irqrestore(&opl4->reg_lock, flags);
|
|
ucontrol->value.integer.value[0] = 7 - (value & 7);
|
|
ucontrol->value.integer.value[1] = 7 - ((value >> 3) & 7);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_opl4_ctl_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
|
|
{
|
|
struct snd_opl4 *opl4 = snd_kcontrol_chip(kcontrol);
|
|
unsigned long flags;
|
|
u8 reg = kcontrol->private_value;
|
|
u8 value, old_value;
|
|
|
|
value = (7 - (ucontrol->value.integer.value[0] & 7)) |
|
|
((7 - (ucontrol->value.integer.value[1] & 7)) << 3);
|
|
spin_lock_irqsave(&opl4->reg_lock, flags);
|
|
old_value = snd_opl4_read(opl4, reg);
|
|
snd_opl4_write(opl4, reg, value);
|
|
spin_unlock_irqrestore(&opl4->reg_lock, flags);
|
|
return value != old_value;
|
|
}
|
|
|
|
static const struct snd_kcontrol_new snd_opl4_controls[] = {
|
|
{
|
|
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
|
.name = "FM Playback Volume",
|
|
.info = snd_opl4_ctl_info,
|
|
.get = snd_opl4_ctl_get,
|
|
.put = snd_opl4_ctl_put,
|
|
.private_value = OPL4_REG_MIX_CONTROL_FM
|
|
},
|
|
{
|
|
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
|
|
.name = "Wavetable Playback Volume",
|
|
.info = snd_opl4_ctl_info,
|
|
.get = snd_opl4_ctl_get,
|
|
.put = snd_opl4_ctl_put,
|
|
.private_value = OPL4_REG_MIX_CONTROL_PCM
|
|
}
|
|
};
|
|
|
|
int snd_opl4_create_mixer(struct snd_opl4 *opl4)
|
|
{
|
|
struct snd_card *card = opl4->card;
|
|
int i, err;
|
|
|
|
strcat(card->mixername, ",OPL4");
|
|
|
|
for (i = 0; i < 2; ++i) {
|
|
err = snd_ctl_add(card, snd_ctl_new1(&snd_opl4_controls[i], opl4));
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|