sound-uclass.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <dm.h>
#include <i2s.h>
#include <sound.h>
#define SOUND_BITS_IN_BYTE 8
int sound_setup(struct udevice *dev)
{
struct sound_ops *ops = sound_get_ops(dev);
if (!ops->setup)
return 0;
return ops->setup(dev);
}
int sound_play(struct udevice *dev, void *data, uint data_size)
{
struct sound_ops *ops = sound_get_ops(dev);
if (!ops->play)
return -ENOSYS;
return ops->play(dev, data, data_size);
}
int sound_start_beep(struct udevice *dev, int frequency_hz)
{
struct sound_ops *ops = sound_get_ops(dev);
if (!ops->start_beep)
return -ENOSYS;
return ops->start_beep(dev, frequency_hz);
}
int sound_stop_beep(struct udevice *dev)
{
struct sound_ops *ops = sound_get_ops(dev);
if (!ops->stop_beep)
return -ENOSYS;
return ops->stop_beep(dev);
}
int sound_beep(struct udevice *dev, int msecs, int frequency_hz)
{
struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
struct i2s_uc_priv *i2s_uc_priv;
unsigned short *data;
uint data_size;
int ret;
ret = sound_setup(dev);
if (ret && ret != -EALREADY)
return ret;
/* Try using the beep interface if available */
ret = sound_start_beep(dev, frequency_hz);
if (ret != -ENOSYS) {
if (ret)
return ret;
mdelay(msecs);
ret = sound_stop_beep(dev);
return ret;
}
/* Buffer length computation */
i2s_uc_priv = dev_get_uclass_priv(uc_priv->i2s);
data_size = i2s_uc_priv->samplingrate * i2s_uc_priv->channels;
data_size *= (i2s_uc_priv->bitspersample / SOUND_BITS_IN_BYTE);
data = malloc(data_size);
if (!data) {
debug("%s: malloc failed\n", __func__);
return -ENOMEM;
}
sound_create_square_wave(i2s_uc_priv->samplingrate, data, data_size,
frequency_hz, i2s_uc_priv->channels);
while (msecs >= 1000) {
ret = sound_play(dev, data, data_size);
msecs -= 1000;
}
if (msecs) {
unsigned long size =
(data_size * msecs) / (sizeof(int) * 1000);
ret = sound_play(dev, data, size);
}
free(data);
return ret;
}
int sound_find_codec_i2s(struct udevice *dev)
{
struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
struct ofnode_phandle_args args;
ofnode node;
int ret;
/* First the codec */
node = ofnode_find_subnode(dev_ofnode(dev), "codec");
if (!ofnode_valid(node)) {
debug("Failed to find /cpu subnode\n");
return -EINVAL;
}
ret = ofnode_parse_phandle_with_args(node, "sound-dai",
"#sound-dai-cells", 0, 0, &args);
if (ret) {
debug("Cannot find phandle: %d\n", ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_AUDIO_CODEC, args.node,
&uc_priv->codec);
if (ret) {
debug("Cannot find codec: %d\n", ret);
return ret;
}
/* Now the i2s */
node = ofnode_find_subnode(dev_ofnode(dev), "cpu");
if (!ofnode_valid(node)) {
debug("Failed to find /cpu subnode\n");
return -EINVAL;
}
ret = ofnode_parse_phandle_with_args(node, "sound-dai",
"#sound-dai-cells", 0, 0, &args);
if (ret) {
debug("Cannot find phandle: %d\n", ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_I2S, args.node, &uc_priv->i2s);
if (ret) {
debug("Cannot find i2s: %d\n", ret);
return ret;
}
debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
uc_priv->codec->name, uc_priv->i2s->name);
return 0;
}
UCLASS_DRIVER(sound) = {
.id = UCLASS_SOUND,
.name = "sound",
.per_device_auto_alloc_size = sizeof(struct sound_uc_priv),
};