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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* dw-hdmi-gp-audio.c
*
* Copyright 2020-2022 NXP
*/
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <drm/bridge/dw_hdmi.h>
#include <drm/drm_edid.h>
#include <drm/drm_connector.h>
#include <sound/hdmi-codec.h>
#include <sound/asoundef.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_drm_eld.h>
#include <sound/pcm_iec958.h>
#include <sound/dmaengine_pcm.h>
#include "dw-hdmi-audio.h"
#define DRIVER_NAME "dw-hdmi-gp-audio"
#define DRV_NAME "hdmi-gp-audio"
struct snd_dw_hdmi {
struct dw_hdmi_audio_data data;
struct platform_device *audio_pdev;
unsigned int pos;
};
struct dw_hdmi_channel_conf {
u8 conf1;
u8 ca;
};
/*
* The default mapping of ALSA channels to HDMI channels and speaker
* allocation bits. Note that we can't do channel remapping here -
* channels must be in the same order.
*
* Mappings for alsa-lib pcm/surround*.conf files:
*
* Front Sur4.0 Sur4.1 Sur5.0 Sur5.1 Sur7.1
* Channels 2 4 6 6 6 8
*
* Our mapping from ALSA channel to CEA686D speaker name and HDMI channel:
*
* Number of ALSA channels
* ALSA Channel 2 3 4 5 6 7 8
* 0 FL:0 = = = = = =
* 1 FR:1 = = = = = =
* 2 FC:3 RL:4 LFE:2 = = =
* 3 RR:5 RL:4 FC:3 = =
* 4 RR:5 RL:4 = =
* 5 RR:5 = =
* 6 RC:6 =
* 7 RLC/FRC RLC/FRC
*/
static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
{ 0x03, 0x00 }, /* FL,FR */
{ 0x0b, 0x02 }, /* FL,FR,FC */
{ 0x33, 0x08 }, /* FL,FR,RL,RR */
{ 0x37, 0x09 }, /* FL,FR,LFE,RL,RR */
{ 0x3f, 0x0b }, /* FL,FR,LFE,FC,RL,RR */
{ 0x7f, 0x0f }, /* FL,FR,LFE,FC,RL,RR,RC */
{ 0xff, 0x13 }, /* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */
};
static int audio_hw_params(struct device *dev, void *data,
struct hdmi_codec_daifmt *daifmt,
struct hdmi_codec_params *params)
{
struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
u8 ca;
dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
ca = default_hdmi_channel_config[params->channels - 2].ca;
dw_hdmi_set_channel_count(dw->data.hdmi, params->channels);
dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
dw_hdmi_set_sample_non_pcm(dw->data.hdmi,
params->iec.status[0] & IEC958_AES0_NONAUDIO);
dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
return 0;
}
static void audio_shutdown(struct device *dev, void *data)
{
}
static int audio_mute_stream(struct device *dev, void *data,
bool enable, int direction)
{
struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
if (!enable)
dw_hdmi_audio_enable(dw->data.hdmi);
else
dw_hdmi_audio_disable(dw->data.hdmi);
return 0;
}
static int audio_get_eld(struct device *dev, void *data,
u8 *buf, size_t len)
{
struct dw_hdmi_audio_data *audio = data;
u8 *eld;
eld = audio->get_eld(audio->hdmi);
if (eld)
memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
else
/* Pass en empty ELD if connector not available */
memset(buf, 0, len);
return 0;
}
static int audio_hook_plugged_cb(struct device *dev, void *data,
hdmi_codec_plugged_cb fn,
struct device *codec_dev)
{
struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
return dw_hdmi_set_plugged_cb(dw->data.hdmi, fn, codec_dev);
}
static const struct hdmi_codec_ops audio_codec_ops = {
.hw_params = audio_hw_params,
.audio_shutdown = audio_shutdown,
.mute_stream = audio_mute_stream,
.get_eld = audio_get_eld,
.hook_plugged_cb = audio_hook_plugged_cb,
};
static int snd_dw_hdmi_probe(struct platform_device *pdev)
{
struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
struct snd_dw_hdmi *dw;
const struct hdmi_codec_pdata codec_data = {
.i2s = 1,
.spdif = 0,
.ops = &audio_codec_ops,
.max_i2s_channels = 8,
.data = data,
};
dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
dw->data = *data;
platform_set_drvdata(pdev, dw);
dw->audio_pdev = platform_device_register_data(&pdev->dev,
HDMI_CODEC_DRV_NAME, 1,
&codec_data,
sizeof(codec_data));
return PTR_ERR_OR_ZERO(dw->audio_pdev);
}
static int snd_dw_hdmi_remove(struct platform_device *pdev)
{
struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
platform_device_unregister(dw->audio_pdev);
return 0;
}
static struct platform_driver snd_dw_hdmi_driver = {
.probe = snd_dw_hdmi_probe,
.remove = snd_dw_hdmi_remove,
.driver = {
.name = DRIVER_NAME,
},
};
module_platform_driver(snd_dw_hdmi_driver);
MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
MODULE_DESCRIPTION("Synopsys Designware HDMI GPA ALSA interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
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