diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c new file mode 100644 index 000000000000..eb3cb09ea164 --- /dev/null +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright 2020 NXP +/* + * 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/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); + int ret = 0; + 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 ret; +} + +static void audio_shutdown(struct device *dev, void *data) +{ +} + +static int audio_digital_mute(struct device *dev, void *data, + bool enable) +{ + struct snd_dw_hdmi *dw = dev_get_drvdata(dev); + int ret = 0; + + if (!enable) + dw_hdmi_audio_enable(dw->data.hdmi); + else + dw_hdmi_audio_disable(dw->data.hdmi); + + return ret; +} + +static int audio_get_eld(struct device *dev, void *data, + u8 *buf, size_t len) +{ + struct snd_dw_hdmi *dw = dev_get_drvdata(dev); + + memcpy(buf, dw->data.eld, min_t(size_t, MAX_ELD_BYTES, 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, + .digital_mute = audio_digital_mute, + .get_eld = audio_get_eld, + .hook_plugged_cb = audio_hook_plugged_cb, +}; + +static int snd_dw_hdmi_probe(struct platform_device *pdev) +{ + const struct dw_hdmi_audio_data *data = pdev->dev.platform_data; + struct snd_dw_hdmi *dw; + + struct hdmi_codec_pdata codec_data = { + .i2s = 1, + .spdif = 0, + .ops = &audio_codec_ops, + .max_i2s_channels = 8, + }; + + 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("Synopsis Designware HDMI GPA ALSA interface"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); |