// SPDX-License-Identifier: GPL-2.0-only /* * DesignWare HDMI audio driver * * Written and tested against the Designware HDMI Tx found in iMX6. */ #include <linux/io.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/platform_device.h> #include <drm/bridge/dw_hdmi.h> #include <drm/drm_edid.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 "dw-hdmi-audio.h" #define DRIVER_NAME … /* Provide some bits rather than bit offsets */ enum { … }; struct dw_hdmi_channel_conf { … }; /* * 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] = …; struct snd_dw_hdmi { … }; static void dw_hdmi_writel(u32 val, void __iomem *ptr) { … } /* * Convert to hardware format: The userspace buffer contains IEC958 samples, * with the PCUV bits in bits 31..28 and audio samples in bits 27..4. We * need these to be in bits 27..24, with the IEC B bit in bit 28, and audio * samples in 23..0. * * Default preamble in bits 3..0: 8 = block start, 4 = even 2 = odd * * Ideally, we could do with having the data properly formatted in userspace. */ static void dw_hdmi_reformat_iec958(struct snd_dw_hdmi *dw, size_t offset, size_t bytes) { … } static u32 parity(u32 sample) { … } static void dw_hdmi_reformat_s24(struct snd_dw_hdmi *dw, size_t offset, size_t bytes) { … } static void dw_hdmi_create_cs(struct snd_dw_hdmi *dw, struct snd_pcm_runtime *runtime) { … } static void dw_hdmi_start_dma(struct snd_dw_hdmi *dw) { … } static void dw_hdmi_stop_dma(struct snd_dw_hdmi *dw) { … } static irqreturn_t snd_dw_hdmi_irq(int irq, void *data) { … } static const struct snd_pcm_hardware dw_hdmi_hw = …; static int dw_hdmi_open(struct snd_pcm_substream *substream) { … } static int dw_hdmi_close(struct snd_pcm_substream *substream) { … } static int dw_hdmi_hw_free(struct snd_pcm_substream *substream) { … } static int dw_hdmi_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { … } static int dw_hdmi_prepare(struct snd_pcm_substream *substream) { … } static int dw_hdmi_trigger(struct snd_pcm_substream *substream, int cmd) { … } static snd_pcm_uframes_t dw_hdmi_pointer(struct snd_pcm_substream *substream) { … } static const struct snd_pcm_ops snd_dw_hdmi_ops = …; static int snd_dw_hdmi_probe(struct platform_device *pdev) { … } static void snd_dw_hdmi_remove(struct platform_device *pdev) { … } #if defined(CONFIG_PM_SLEEP) && defined(IS_NOT_BROKEN) /* * This code is fine, but requires implementation in the dw_hdmi_trigger() * method which is currently missing as I have no way to test this. */ static int snd_dw_hdmi_suspend(struct device *dev) { struct snd_dw_hdmi *dw = dev_get_drvdata(dev); snd_power_change_state(dw->card, SNDRV_CTL_POWER_D3cold); return 0; } static int snd_dw_hdmi_resume(struct device *dev) { struct snd_dw_hdmi *dw = dev_get_drvdata(dev); snd_power_change_state(dw->card, SNDRV_CTL_POWER_D0); return 0; } static SIMPLE_DEV_PM_OPS(snd_dw_hdmi_pm, snd_dw_hdmi_suspend, snd_dw_hdmi_resume); #define PM_OPS … #else #define PM_OPS … #endif static struct platform_driver snd_dw_hdmi_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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