diff options
Diffstat (limited to 'sound/soc/codecs/spdif_transmitter.c')
-rw-r--r-- | sound/soc/codecs/spdif_transmitter.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/sound/soc/codecs/spdif_transmitter.c b/sound/soc/codecs/spdif_transmitter.c new file mode 100644 index 0000000000..7365189215 --- /dev/null +++ b/sound/soc/codecs/spdif_transmitter.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ALSA SoC SPDIF DIT driver + * + * This driver is used by controllers which can operate in DIT (SPDI/F) where + * no codec is needed. This file provides stub codec that can be used + * in these configurations. TI DaVinci Audio controller uses this driver. + * + * Author: Steve Chen, <schen@mvista.com> + * Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com> + * Copyright: (C) 2009 Texas Instruments, India + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/slab.h> +#include <sound/soc.h> +#include <sound/pcm.h> +#include <sound/initval.h> +#include <linux/of.h> + +#define DRV_NAME "spdif-dit" + +#define STUB_RATES SNDRV_PCM_RATE_8000_192000 +#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S20_3LE | \ + SNDRV_PCM_FMTBIT_S24_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +static const struct snd_soc_dapm_widget dit_widgets[] = { + SND_SOC_DAPM_OUTPUT("spdif-out"), +}; + +static const struct snd_soc_dapm_route dit_routes[] = { + { "spdif-out", NULL, "Playback" }, +}; + +static struct snd_soc_component_driver soc_codec_spdif_dit = { + .dapm_widgets = dit_widgets, + .num_dapm_widgets = ARRAY_SIZE(dit_widgets), + .dapm_routes = dit_routes, + .num_dapm_routes = ARRAY_SIZE(dit_routes), + .idle_bias_on = 1, + .use_pmdown_time = 1, + .endianness = 1, +}; + +static struct snd_soc_dai_driver dit_stub_dai = { + .name = "dit-hifi", + .playback = { + .stream_name = "Playback", + .channels_min = 1, + .channels_max = 384, + .rates = STUB_RATES, + .formats = STUB_FORMATS, + }, +}; + +static int spdif_dit_probe(struct platform_device *pdev) +{ + return devm_snd_soc_register_component(&pdev->dev, + &soc_codec_spdif_dit, + &dit_stub_dai, 1); +} + +#ifdef CONFIG_OF +static const struct of_device_id spdif_dit_dt_ids[] = { + { .compatible = "linux,spdif-dit", }, + { } +}; +MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids); +#endif + +static struct platform_driver spdif_dit_driver = { + .probe = spdif_dit_probe, + .driver = { + .name = DRV_NAME, + .of_match_table = of_match_ptr(spdif_dit_dt_ids), + }, +}; + +module_platform_driver(spdif_dit_driver); + +MODULE_AUTHOR("Steve Chen <schen@mvista.com>"); +MODULE_DESCRIPTION("SPDIF dummy codec driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); |