[alsa-devel] [PATCH RFC v2 REPOST 3/8] ASoC: davinci-evm: HDMI audio support for TDA998x trough McASP I2S bus
Jean-Francois Moine
moinejf at free.fr
Fri Jan 24 11:54:31 EST 2014
On Fri, 24 Jan 2014 14:57:09 +0200
Jyri Sarha <jsarha at ti.com> wrote:
> Could you give me a link to a git repo with your tda998x codec code so I
> could prepare to use that too?
I have no git repo. Instead, here is the source.
It goes into sound/soc/codecs and is selected with CONFIG_OF and
CONFIG_DRM_I2C_NXP_TDA998X.
It needs 2 exported functions of the tda998x driver: the first one to
select the audio port (tda998x_audio_update) and the other one to get
the ELD (tda998x_audio_get_eld).
For these functions to receive the correct i2c_client, the codec
searches the tda998x driver in the DT by its compatible "nxp,tda998x".
If the tda998x is loaded by drm_i2c_encoder_init(), it should not be
declared in the DT, so, this raises a problem. I don't know what must
be done in this case.
The codec is used with the simple card as the sound card. For you, the
DT could be:
hdmi_codec: hdmi-codec {
compatible = "nxp,tda998x-codec";
#sound-dai-cells = <1>;
audio-ports = <0x03>, <0x04>; /* i2s - s/pdif */
};
sound {
compatible = "simple-audio-card";
simple-audio-card,cpu {
sound-dai = <&audio1 1>;
format = "i2s";
};
simple-audio-card,codec {
sound-dai = <&hdmi_codec 0>; /* i2s */
};
};
('audio1' is the audio controller)
-------------------8<---------------- source sound/soc/codecs/tda998x.c
/*
* ALSA SoC TDA998X driver
*
* This driver is used by the NXP TDA998x HDMI transmitter.
*
* Copyright (C) 2014 Jean-Francois Moine
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <linux/of.h>
#include <linux/i2c.h>
#include <drm/drm_encoder_slave.h>
#include <drm/i2c/tda998x.h>
#define TDA998X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S20_3LE | \
SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_S32_LE)
struct tda_priv {
struct i2c_client *i2c_client;
struct snd_soc_codec *codec;
u32 ports[2];
int dai_id;
u8 *eld;
};
static void tda_get_encoder(struct tda_priv *priv)
{
struct snd_soc_codec *codec = priv->codec;
struct device_node *np;
struct i2c_client *i2c_client;
static const struct of_device_id tda_dt[] = {
{ .compatible = "nxp,tda998x" },
{ },
};
/* search the tda998x device (only one!) */
np = of_find_matching_node_and_match(NULL, tda_dt, NULL);
if (!np || !of_device_is_available(np)) {
dev_err(codec->dev, "No tda998x in DT\n");
return;
}
i2c_client = of_find_i2c_device_by_node(np);
of_node_put(np);
if (!i2c_client) {
dev_err(codec->dev, "no tda998x i2c client\n");
return;
}
if (!i2c_get_clientdata(i2c_client)) {
dev_err(codec->dev, "tda998x not initialized\n");
return;
}
priv->i2c_client = i2c_client;
}
static int tda_start_stop(struct tda_priv *priv,
int start)
{
int format;
u32 port;
if (!priv->i2c_client) {
tda_get_encoder(priv);
if (!priv->i2c_client)
return -EINVAL;
}
/* give the audio input type and ports to the HDMI encoder */
format = start ? priv->dai_id : 0;
switch (format) {
case AFMT_I2S:
port = priv->ports[0];
break;
default:
case AFMT_SPDIF:
port = priv->ports[1];
break;
}
tda998x_audio_update(priv->i2c_client, format, port);
return 0;
}
static int tda_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct tda_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
u8 *eld = NULL;
static unsigned rates_mask[] = {
SNDRV_PCM_RATE_32000,
SNDRV_PCM_RATE_44100,
SNDRV_PCM_RATE_48000,
SNDRV_PCM_RATE_88200,
SNDRV_PCM_RATE_96000,
SNDRV_PCM_RATE_176400,
SNDRV_PCM_RATE_192000,
};
/* memorize the used DAI */
priv->dai_id = dai->id;
/* get the ELD from the tda998x driver */
if (!priv->i2c_client)
tda_get_encoder(priv);
if (priv->i2c_client)
eld = tda998x_audio_get_eld(priv->i2c_client);
/* limit the hw params from the ELD (EDID) */
if (eld) {
struct snd_soc_dai_driver *dai_drv = dai->driver;
struct snd_soc_pcm_stream *stream = &dai_drv->playback;
u8 *sad;
int sad_count;
unsigned eld_ver, mnl, rates, rate_mask, i;
unsigned max_channels;
eld_ver = eld[0] >> 3;
if (eld_ver != 2 && eld_ver != 31)
return 0;
mnl = eld[4] & 0x1f;
if (mnl > 16)
return 0;
sad_count = eld[5] >> 4;
sad = eld + 20 + mnl;
/* Start from the basic audio settings */
max_channels = 2;
rates = 0;
while (sad_count--) {
switch (sad[0] & 0x78) {
case 0x08: /* PCM */
max_channels = max(max_channels, (sad[0] & 7) + 1u);
rates |= sad[1];
break;
}
sad += 3;
}
for (rate_mask = i = 0; i < ARRAY_SIZE(rates_mask); i++)
if (rates & 1 << i)
rate_mask |= rates_mask[i];
/* change the snd_soc_pcm_stream values of the driver */
stream->rates = rate_mask;
stream->channels_max = max_channels;
}
/* start the TDA998x audio */
return tda_start_stop(priv, 1);
}
static void tda_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct tda_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
priv->dai_id = 0;
tda_start_stop(priv, 0);
}
static const struct snd_soc_dai_ops tda_ops = {
.startup = tda_startup,
.shutdown = tda_shutdown,
};
static const struct snd_soc_dai_driver tda998x_dai[] = {
{
.name = "i2s-hifi",
.id = AFMT_I2S,
.playback = {
.stream_name = "HDMI I2S Playback",
.channels_min = 1,
.channels_max = 8,
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.rate_min = 5512,
.rate_max = 192000,
.formats = TDA998X_FORMATS,
},
.ops = &tda_ops,
},
{
.name = "spdif-hifi",
.id = AFMT_SPDIF,
.playback = {
.stream_name = "HDMI SPDIF Playback",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.rate_min = 22050,
.rate_max = 192000,
.formats = TDA998X_FORMATS,
},
.ops = &tda_ops,
},
};
static const struct snd_soc_dapm_widget tda_widgets[] = {
SND_SOC_DAPM_OUTPUT("hdmi-out"),
};
static const struct snd_soc_dapm_route tda_routes[] = {
{ "hdmi-out", NULL, "HDMI I2S Playback" },
{ "hdmi-out", NULL, "HDMI SPDIF Playback" },
};
static int tda_probe(struct snd_soc_codec *codec)
{
struct tda_priv *priv;
struct device_node *np;
int i, ret;
priv = devm_kzalloc(codec->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
snd_soc_codec_set_drvdata(codec, priv);
priv->codec = codec;
/* get the audio input ports (I2s and S/PDIF) */
np = codec->dev->of_node;
for (i = 0; i < 2; i++) {
ret = of_property_read_u32_index(np, "audio-ports", i,
&priv->ports[i]);
if (ret) {
if (i == 0)
dev_err(codec->dev,
"bad or missing audio-ports\n");
break;
}
}
return 0;
}
static const struct snd_soc_codec_driver soc_codec_tda998x = {
.probe = tda_probe,
.dapm_widgets = tda_widgets,
.num_dapm_widgets = ARRAY_SIZE(tda_widgets),
.dapm_routes = tda_routes,
.num_dapm_routes = ARRAY_SIZE(tda_routes),
};
static int tda998x_dev_probe(struct platform_device *pdev)
{
struct snd_soc_dai_driver *dai_drv;
/* copy the DAI driver to a writable area */
dai_drv = devm_kzalloc(&pdev->dev, sizeof(tda998x_dai), GFP_KERNEL);
if (!dai_drv)
return -ENOMEM;
memcpy(dai_drv, tda998x_dai, sizeof(tda998x_dai));
return snd_soc_register_codec(&pdev->dev,
&soc_codec_tda998x,
dai_drv, ARRAY_SIZE(tda998x_dai));
}
static int tda998x_dev_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static const struct of_device_id tda998x_codec_ids[] = {
{ .compatible = "nxp,tda998x-codec", },
{ }
};
MODULE_DEVICE_TABLE(of, tda998x_codec_ids);
static struct platform_driver tda998x_driver = {
.probe = tda998x_dev_probe,
.remove = tda998x_dev_remove,
.driver = {
.name = "tda998x-codec",
.owner = THIS_MODULE,
.of_match_table = tda998x_codec_ids,
},
};
module_platform_driver(tda998x_driver);
MODULE_AUTHOR("Jean-Francois Moine");
MODULE_DESCRIPTION("TDA998x codec driver");
MODULE_LICENSE("GPL");
-------------------8<----------------
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
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