diff options
Diffstat (limited to 'drivers/gpu/drm/i2c/tda998x_codec.c')
| -rw-r--r-- | drivers/gpu/drm/i2c/tda998x_codec.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i2c/tda998x_codec.c b/drivers/gpu/drm/i2c/tda998x_codec.c new file mode 100644 index 000000000000..c84d2b58f42d --- /dev/null +++ b/drivers/gpu/drm/i2c/tda998x_codec.c @@ -0,0 +1,248 @@ +/* + * ALSA SoC TDA998X CODEC + * + * Copyright (C) 2014 Jean-Francois Moine + * + * 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/module.h> +#include <sound/soc.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <linux/of.h> +#include <linux/i2c.h> +#include <drm/drm_encoder_slave.h> +#include <drm/i2c/tda998x.h> + +#include "tda998x_drv.h" + +#define TDA998X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S20_3LE | \ + SNDRV_PCM_FMTBIT_S24_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +static int tda_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct tda998x_priv *priv = snd_soc_codec_get_drvdata(dai->codec); + u8 *eld = priv->eld; + struct snd_pcm_runtime *runtime = substream->runtime; + u8 *sad; + int sad_count; + unsigned eld_ver, mnl, rate_mask; + unsigned max_channels, fmt; + u64 formats; + struct snd_pcm_hw_constraint_list *rate_constraints = + &priv->rate_constraints; + static const u32 hdmi_rates[] = { + 32000, 44100, 48000, 88200, 96000, 176400, 192000 + }; + + /* check if streaming is already active */ + if (priv->dai_id != AFMT_NO_AUDIO) + return -EBUSY; + priv->dai_id = dai->id; + + if (!eld) + return 0; + + /* adjust the hw params from the ELD (EDID) */ + eld_ver = eld[0] >> 3; + if (eld_ver != 2 && eld_ver != 31) + return 0; + + mnl = eld[4] & 0x1f; + if (mnl > 16) + return 0; + + sad_count = eld[5] >> 4; + sad = eld + 20 + mnl; + + /* Start from the basic audio settings */ + max_channels = 2; + rate_mask = 0; + fmt = 0; + while (sad_count--) { + switch (sad[0] & 0x78) { + case 0x08: /* PCM */ + max_channels = max(max_channels, (sad[0] & 7) + 1u); + rate_mask |= sad[1]; + fmt |= sad[2] & 0x07; + break; + } + sad += 3; + } + + /* set the constraints */ + rate_constraints->list = hdmi_rates; + rate_constraints->count = ARRAY_SIZE(hdmi_rates); + rate_constraints->mask = rate_mask; + snd_pcm_hw_constraint_list(runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + rate_constraints); + + formats = 0; + if (fmt & 1) + formats |= SNDRV_PCM_FMTBIT_S16_LE; + if (fmt & 2) + formats |= SNDRV_PCM_FMTBIT_S20_3LE; + if (fmt & 4) + formats |= SNDRV_PCM_FMTBIT_S24_LE; + snd_pcm_hw_constraint_mask64(runtime, + SNDRV_PCM_HW_PARAM_FORMAT, + formats); + + snd_pcm_hw_constraint_minmax(runtime, + SNDRV_PCM_HW_PARAM_CHANNELS, + 1, max_channels); + return 0; +} + +static int tda_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct tda998x_priv *priv = snd_soc_codec_get_drvdata(dai->codec); + + /* Requires an attached display */ + if (!priv->encoder->crtc) + return -ENODEV; + + /* if same input and same parameters, do not do a full switch */ + if (dai->id == priv->params.audio_format && + params_format(params) == priv->audio_sample_format) { + tda998x_audio_start(priv, 0); + return 0; + } + priv->params.audio_sample_rate = params_rate(params); + priv->params.audio_format = dai->id; + priv->audio_sample_format = params_format(params); + priv->params.audio_cfg = + priv->audio_ports[dai->id == AFMT_I2S ? 0 : 1]; + tda998x_audio_start(priv, 1); + return 0; +} + +static void tda_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct tda998x_priv *priv = snd_soc_codec_get_drvdata(dai->codec); + + tda998x_audio_stop(priv); + priv->dai_id = AFMT_NO_AUDIO; +} + +static const struct snd_soc_dai_ops tda_ops = { + .startup = tda_startup, + .hw_params = tda_hw_params, + .shutdown = tda_shutdown, +}; + +static struct snd_soc_dai_driver tda998x_dai[] = { + { + .name = "i2s-hifi", + .id = AFMT_I2S, + .playback = { + .stream_name = "HDMI I2S Playback", + .channels_min = 1, + .channels_max = 8, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .rate_min = 5512, + .rate_max = 192000, + .formats = TDA998X_FORMATS, + }, + .ops = &tda_ops, + }, + { + .name = "spdif-hifi", + .id = AFMT_SPDIF, + .playback = { + .stream_name = "HDMI SPDIF Playback", + .channels_min = 1, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .rate_min = 22050, + .rate_max = 192000, + .formats = TDA998X_FORMATS, + }, + .ops = &tda_ops, + }, +}; + +static const struct snd_soc_dapm_widget tda_widgets[] = { + SND_SOC_DAPM_OUTPUT("hdmi-out"), +}; +static const struct snd_soc_dapm_route tda_routes[] = { + { "hdmi-out", NULL, "HDMI I2S Playback" }, + { "hdmi-out", NULL, "HDMI SPDIF Playback" }, +}; + +static int tda_probe(struct snd_soc_codec *codec) +{ + struct i2c_client *i2c_client = to_i2c_client(codec->dev); + struct tda998x_priv *priv = i2c_get_clientdata(i2c_client); + struct device_node *np = codec->dev->of_node; + int i, j, ret; + const char *p; + + if (!priv) + return -ENODEV; + snd_soc_codec_set_drvdata(codec, priv); + + if (!np) + return 0; + + /* get the audio input ports*/ + for (i = 0; i < 2; i++) { + u32 port; + + ret = of_property_read_u32_index(np, "audio-ports", i, &port); + if (ret) { + if (i == 0) + dev_err(codec->dev, + "bad or missing audio-ports\n"); + break; + } + ret = of_property_read_string_index(np, "audio-port-names", + i, &p); + if (ret) { + dev_err(codec->dev, + "missing audio-port-names[%d]\n", i); + break; + } + if (strcmp(p, "i2s") == 0) { + j = 0; + } else if (strcmp(p, "spdif") == 0) { + j = 1; + } else { + dev_err(codec->dev, + "bad audio-port-names '%s'\n", p); + break; + } + priv->audio_ports[j] = port; + } + return 0; +} + +static const struct snd_soc_codec_driver soc_codec_tda998x = { + .probe = tda_probe, + .dapm_widgets = tda_widgets, + .num_dapm_widgets = ARRAY_SIZE(tda_widgets), + .dapm_routes = tda_routes, + .num_dapm_routes = ARRAY_SIZE(tda_routes), +}; + +int tda998x_codec_register(struct device *dev) +{ + return snd_soc_register_codec(dev, + &soc_codec_tda998x, + tda998x_dai, ARRAY_SIZE(tda998x_dai)); +} + +void tda998x_codec_unregister(struct device *dev) +{ + snd_soc_unregister_codec(dev); +} |