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// SPDX-License-Identifier: GPL-2.0-only
#include <common.h>
#include <errno.h>
#include <driver.h>
#include <mach/linux.h>
#include <linux/time.h>
#include <linux/math64.h>
#include <of.h>
#include <sound.h>
#define AMPLITUDE 28000
#define SAMPLERATE 44000ULL
struct sandbox_sound {
struct sound_card card;
};
static int sandbox_sound_beep(struct sound_card *card, unsigned freq, unsigned duration)
{
size_t nsamples = div_s64(SAMPLERATE * duration, USEC_PER_SEC);
int16_t *data;
int ret;
if (!freq) {
sdl_sound_stop();
return 0;
}
data = malloc(nsamples * sizeof(*data));
if (!data)
return -ENOMEM;
synth_sin(freq, AMPLITUDE, data, SAMPLERATE, nsamples);
ret = sdl_sound_play(data, nsamples);
if (ret)
ret = -EIO;
free(data);
return ret;
}
static int sandbox_sound_probe(struct device_d *dev)
{
struct sandbox_sound *priv;
struct sound_card *card;
int ret;
priv = xzalloc(sizeof(*priv));
card = &priv->card;
card->name = "SDL-Audio";
card->beep = sandbox_sound_beep;
ret = sdl_sound_init(SAMPLERATE);
if (ret) {
ret = -ENODEV;
goto free_priv;
}
ret = sound_card_register(card);
if (ret)
goto sdl_sound_close;
dev_info(dev, "probed\n");
return 0;
sdl_sound_close:
sdl_sound_close();
free_priv:
free(priv);
return ret;
}
static __maybe_unused struct of_device_id sandbox_sound_dt_ids[] = {
{ .compatible = "barebox,sandbox-sound" },
{ /* sentinel */ }
};
static struct driver_d sandbox_sound_drv = {
.name = "sandbox-sound",
.of_compatible = sandbox_sound_dt_ids,
.probe = sandbox_sound_probe,
};
device_platform_driver(sandbox_sound_drv);
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