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Currently the hdmi-codec driver always registers both playback and capture capabilities but for most systems there's no actual capture capability, usually HDMI is transmit only. Provide platform data which allows the users to indicate what is supported so that we don't end up advertising things to userspace that we can't actually support. In order to avoid breaking existing users the flags in platform data are a bit awkward and specify what should be disabled rather than doing the perhaps more expected thing and defaulting to not supporting capture. Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://lore.kernel.org/r/20221130184644.464820-2-broonie@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* hdmi-codec.h - HDMI Codec driver API
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*
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* Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com
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*
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* Author: Jyri Sarha <jsarha@ti.com>
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*/
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#ifndef __HDMI_CODEC_H__
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#define __HDMI_CODEC_H__
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#include <linux/of_graph.h>
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#include <linux/hdmi.h>
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#include <drm/drm_edid.h>
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#include <sound/asoundef.h>
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#include <sound/soc.h>
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#include <uapi/sound/asound.h>
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/*
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* Protocol between ASoC cpu-dai and HDMI-encoder
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*/
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struct hdmi_codec_daifmt {
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enum {
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HDMI_I2S,
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HDMI_RIGHT_J,
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HDMI_LEFT_J,
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HDMI_DSP_A,
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HDMI_DSP_B,
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HDMI_AC97,
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HDMI_SPDIF,
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} fmt;
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unsigned int bit_clk_inv:1;
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unsigned int frame_clk_inv:1;
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unsigned int bit_clk_provider:1;
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unsigned int frame_clk_provider:1;
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/* bit_fmt could be standard PCM format or
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* IEC958 encoded format. ALSA IEC958 plugin will pass
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* IEC958_SUBFRAME format to the underneath driver.
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*/
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snd_pcm_format_t bit_fmt;
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};
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/*
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* HDMI audio parameters
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*/
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struct hdmi_codec_params {
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struct hdmi_audio_infoframe cea;
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struct snd_aes_iec958 iec;
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int sample_rate;
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int sample_width;
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int channels;
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};
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typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
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bool plugged);
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struct hdmi_codec_pdata;
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struct hdmi_codec_ops {
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/*
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* Called when ASoC starts an audio stream setup.
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* Optional
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*/
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int (*audio_startup)(struct device *dev, void *data);
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/*
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* Configures HDMI-encoder for audio stream.
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* Having either prepare or hw_params is mandatory.
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*/
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int (*hw_params)(struct device *dev, void *data,
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struct hdmi_codec_daifmt *fmt,
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struct hdmi_codec_params *hparms);
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/*
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* Configures HDMI-encoder for audio stream. Can be called
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* multiple times for each setup.
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*
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* Having either prepare or hw_params is mandatory.
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*/
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int (*prepare)(struct device *dev, void *data,
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struct hdmi_codec_daifmt *fmt,
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struct hdmi_codec_params *hparms);
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/*
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* Shuts down the audio stream.
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* Mandatory
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*/
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void (*audio_shutdown)(struct device *dev, void *data);
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/*
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* Mute/unmute HDMI audio stream.
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* Optional
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*/
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int (*mute_stream)(struct device *dev, void *data,
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bool enable, int direction);
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/*
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* Provides EDID-Like-Data from connected HDMI device.
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* Optional
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*/
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int (*get_eld)(struct device *dev, void *data,
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uint8_t *buf, size_t len);
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/*
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* Getting DAI ID
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* Optional
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*/
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int (*get_dai_id)(struct snd_soc_component *comment,
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struct device_node *endpoint);
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/*
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* Hook callback function to handle connector plug event.
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* Optional
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*/
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int (*hook_plugged_cb)(struct device *dev, void *data,
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hdmi_codec_plugged_cb fn,
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struct device *codec_dev);
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/* bit field */
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unsigned int no_capture_mute:1;
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};
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/* HDMI codec initalization data */
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struct hdmi_codec_pdata {
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const struct hdmi_codec_ops *ops;
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uint i2s:1;
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uint no_i2s_playback:1;
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uint no_i2s_capture:1;
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uint spdif:1;
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uint no_spdif_playback:1;
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uint no_spdif_capture:1;
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int max_i2s_channels;
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void *data;
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};
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struct snd_soc_component;
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struct snd_soc_jack;
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#define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
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#endif /* __HDMI_CODEC_H__ */
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