This patch adds a CODEC to the NXP TDA998x HDMI transmitter.
The CODEC handles both I2S and S/PDIF inputs. It maintains the audio format and rate constraints according to the HDMI device parameters (EDID) and sets dynamically the input ports in the TDA998x I2C driver on start/stop audio streaming.
Signed-off-by: Jean-Francois Moine moinejf@free.fr --- drivers/gpu/drm/i2c/Kconfig | 1 + drivers/gpu/drm/i2c/tda998x_drv.c | 139 ++++++++++++++++++++++++++++-- include/sound/tda998x.h | 23 +++++ sound/soc/codecs/Kconfig | 4 + sound/soc/codecs/Makefile | 2 + sound/soc/codecs/tda998x.c | 175 ++++++++++++++++++++++++++++++++++++++ 6 files changed, 339 insertions(+), 5 deletions(-) create mode 100644 include/sound/tda998x.h create mode 100644 sound/soc/codecs/tda998x.c
diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig index 22c7ed6..24fc975 100644 --- a/drivers/gpu/drm/i2c/Kconfig +++ b/drivers/gpu/drm/i2c/Kconfig @@ -28,6 +28,7 @@ config DRM_I2C_SIL164 config DRM_I2C_NXP_TDA998X tristate "NXP Semiconductors TDA998X HDMI encoder" default m if DRM_TILCDC + select SND_SOC_TDA998X help Support for NXP Semiconductors TDA998X HDMI encoders.
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c index ce1478d..a26a516 100644 --- a/drivers/gpu/drm/i2c/tda998x_drv.c +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -27,6 +27,11 @@ #include <drm/drm_encoder_slave.h> #include <drm/drm_edid.h> #include <drm/i2c/tda998x.h> +#include <sound/tda998x.h> + +#if defined(CONFIG_SND_SOC_TDA998X) || defined(CONFIG_SND_SOC_TDA998X_MODULE) +#define WITH_CODEC 1 +#endif
#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
@@ -47,6 +52,10 @@ struct tda998x_priv { struct drm_encoder *encoder;
u8 audio_ports[2]; +#ifdef WITH_CODEC + u8 sad[3]; /* Short Audio Descriptor */ + struct snd_pcm_hw_constraint_list rate_constraints; +#endif };
#define to_tda998x_priv(x) ((struct tda998x_priv *)to_encoder_slave(x)->slave_priv) @@ -730,11 +739,109 @@ tda998x_configure_audio(struct tda998x_priv *priv, tda998x_write_aif(priv, p); }
+#ifdef WITH_CODEC +/* tda998x audio codec interface */ + +/* return the audio parameters extracted from the last EDID */ +static int tda998x_get_audio_var(struct device *dev, + u8 **sad, + struct snd_pcm_hw_constraint_list **rate_constraints) +{ + struct tda998x_priv *priv = dev_get_drvdata(dev); + + if (!priv->encoder->crtc + || !priv->is_hdmi_sink) + return -ENODEV; + + *sad = priv->sad; + *rate_constraints = &priv->rate_constraints; + return 0; +} + +/* switch the audio port and initialize the audio parameters for streaming */ +static int tda998x_set_audio_input(struct device *dev, + int port_index, + unsigned sample_rate, + int sample_format) +{ + struct tda998x_priv *priv = dev_get_drvdata(dev); + struct tda998x_encoder_params *p = &priv->params; + + if (!priv->encoder->crtc) + return -ENODEV; + + /* if no port, just disable the audio port */ + if (port_index == PORT_NONE) { + reg_write(priv, REG_ENA_AP, 0); + return 0; + } + + /* if same audio parameters, just enable the audio port */ + if (p->audio_cfg == priv->audio_ports[port_index] && + p->audio_sample_rate == sample_rate) { + reg_write(priv, REG_ENA_AP, p->audio_cfg); + return 0; + } + + p->audio_format = port_index == PORT_SPDIF ? AFMT_SPDIF : AFMT_I2S; + p->audio_clk_cfg = port_index == PORT_SPDIF ? 0 : 1; + p->audio_cfg = priv->audio_ports[port_index]; + p->audio_sample_rate = sample_rate; + tda998x_configure_audio(priv, &priv->encoder->crtc->hwmode, p); + return 0; +} + +/* get the audio capabilities from the EDID */ +static void tda998x_get_audio_caps(struct tda998x_priv *priv, + struct drm_connector *connector) +{ + u8 *eld = connector->eld; + u8 *sad; + int sad_count; + unsigned eld_ver, mnl; + u8 max_channels, rate_mask, fmt; + + /* adjust the hw params from the ELD (EDID) */ + eld_ver = eld[0] >> 3; + if (eld_ver != 2 && eld_ver != 31) + return; + + mnl = eld[4] & 0x1f; + if (mnl > 16) + return; + + sad_count = eld[5] >> 4; + sad = eld + 20 + mnl; + + /* Start from the basic audio settings */ + max_channels = 1; + rate_mask = 0; + fmt = 0; + while (sad_count--) { + switch (sad[0] & 0x78) { + case 0x08: /* SAD uncompressed audio */ + if ((sad[0] & 7) > max_channels) + max_channels = sad[0] & 7; + rate_mask |= sad[1]; + fmt |= sad[2] & 0x07; + break; + } + sad += 3; + } + + priv->sad[0] = max_channels; + priv->sad[1] = rate_mask; + priv->sad[2] = fmt; +} +#endif /* WITH_CODEC */ + /* DRM encoder functions */
static void tda998x_encoder_set_config(struct tda998x_priv *priv, const struct tda998x_encoder_params *p) { + int port_index; + priv->vip_cntrl_0 = VIP_CNTRL_0_SWAP_A(p->swap_a) | (p->mirr_a ? VIP_CNTRL_0_MIRR_A : 0) | VIP_CNTRL_0_SWAP_B(p->swap_b) | @@ -749,6 +856,8 @@ static void tda998x_encoder_set_config(struct tda998x_priv *priv, (p->mirr_f ? VIP_CNTRL_2_MIRR_F : 0);
priv->params = *p; + port_index = p->audio_format == AFMT_SPDIF ? PORT_SPDIF : PORT_I2S; + priv->audio_ports[port_index] = p->audio_cfg; }
static void tda998x_encoder_dpms(struct tda998x_priv *priv, int mode) @@ -1142,6 +1251,15 @@ tda998x_encoder_get_modes(struct tda998x_priv *priv, drm_mode_connector_update_edid_property(connector, edid); n = drm_add_edid_modes(connector, edid); priv->is_hdmi_sink = drm_detect_hdmi_monitor(edid); + +#ifdef WITH_CODEC + /* set the audio parameters from the EDID */ + if (priv->is_hdmi_sink) { + drm_edid_to_eld(connector, edid); + tda998x_get_audio_caps(priv, connector); + } +#endif + kfree(edid); }
@@ -1176,6 +1294,10 @@ static void tda998x_destroy(struct tda998x_priv *priv) if (priv->hdmi->irq) free_irq(priv->hdmi->irq, priv);
+#ifdef WITH_CODEC + tda9998x_codec_unregister(&priv->hdmi->dev); +#endif + i2c_unregister_device(priv->cec); }
@@ -1384,26 +1506,33 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv) break; } if (strcmp(p, "spdif") == 0) { - priv->audio_ports[0] = port; + priv->audio_ports[PORT_SPDIF] = port; } else if (strcmp(p, "i2s") == 0) { - priv->audio_ports[1] = port; + priv->audio_ports[PORT_I2S] = port; } else { dev_err(&client->dev, "bad audio-port-names '%s'\n", p); break; } } - if (priv->audio_ports[0]) { - priv->params.audio_cfg = priv->audio_ports[0]; + if (priv->audio_ports[PORT_SPDIF]) { + priv->params.audio_cfg = priv->audio_ports[PORT_SPDIF]; priv->params.audio_format = AFMT_SPDIF; priv->params.audio_clk_cfg = 0; } else { - priv->params.audio_cfg = priv->audio_ports[1]; + priv->params.audio_cfg = priv->audio_ports[PORT_I2S]; priv->params.audio_format = AFMT_I2S; priv->params.audio_clk_cfg = 1; } }
+#ifdef WITH_CODEC + /* create the audio CODEC */ + if (priv->audio_ports[PORT_SPDIF] || priv->audio_ports[PORT_I2S]) + tda9998x_codec_register(&client->dev, + tda998x_get_audio_var, + tda998x_set_audio_input); +#endif return 0;
fail: diff --git a/include/sound/tda998x.h b/include/sound/tda998x.h new file mode 100644 index 0000000..97cff30 --- /dev/null +++ b/include/sound/tda998x.h @@ -0,0 +1,23 @@ +#ifndef SND_TDA998X_H +#define SND_TDA998X_H + +#include <sound/pcm.h> + +/* port indexes */ +#define PORT_NONE (-1) +#define PORT_SPDIF 0 +#define PORT_I2S 1 + +typedef int (*get_audio_var_t)(struct device *dev, + u8 **sad, + struct snd_pcm_hw_constraint_list **rate_constraints); +typedef int (*set_audio_input_t)(struct device *dev, + int port_index, + unsigned sample_rate, + int sample_format); + +int tda9998x_codec_register(struct device *dev, + get_audio_var_t get_audio_var_i, + set_audio_input_t set_audio_input_i); +void tda9998x_codec_unregister(struct device *dev); +#endif diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index 8349f98..456c549 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -102,6 +102,7 @@ config SND_SOC_ALL_CODECS select SND_SOC_STAC9766 if SND_SOC_AC97_BUS select SND_SOC_TAS2552 if I2C select SND_SOC_TAS5086 if I2C + select SND_SOC_TDA998X if DRM_I2C_NXP_TDA998X select SND_SOC_TFA9879 if I2C select SND_SOC_TLV320AIC23_I2C if I2C select SND_SOC_TLV320AIC23_SPI if SPI_MASTER @@ -600,6 +601,9 @@ config SND_SOC_TAS5086 tristate "Texas Instruments TAS5086 speaker amplifier" depends on I2C
+config SND_SOC_TDA998X + tristate + config SND_SOC_TFA9879 tristate "NXP Semiconductors TFA9879 amplifier" depends on I2C diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile index bbdfd1e..44b4fda 100644 --- a/sound/soc/codecs/Makefile +++ b/sound/soc/codecs/Makefile @@ -104,6 +104,7 @@ snd-soc-sta350-objs := sta350.o snd-soc-sta529-objs := sta529.o snd-soc-stac9766-objs := stac9766.o snd-soc-tas5086-objs := tas5086.o +snd-soc-tda998x-objs := tda998x.o snd-soc-tfa9879-objs := tfa9879.o snd-soc-tlv320aic23-objs := tlv320aic23.o snd-soc-tlv320aic23-i2c-objs := tlv320aic23-i2c.o @@ -282,6 +283,7 @@ obj-$(CONFIG_SND_SOC_STA529) += snd-soc-sta529.o obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o obj-$(CONFIG_SND_SOC_TAS2552) += snd-soc-tas2552.o obj-$(CONFIG_SND_SOC_TAS5086) += snd-soc-tas5086.o +obj-$(CONFIG_SND_SOC_TDA998X) += snd-soc-tda998x.o obj-$(CONFIG_SND_SOC_TFA9879) += snd-soc-tfa9879.o obj-$(CONFIG_SND_SOC_TLV320AIC23) += snd-soc-tlv320aic23.o obj-$(CONFIG_SND_SOC_TLV320AIC23_I2C) += snd-soc-tlv320aic23-i2c.o diff --git a/sound/soc/codecs/tda998x.c b/sound/soc/codecs/tda998x.c new file mode 100644 index 0000000..b055570 --- /dev/null +++ b/sound/soc/codecs/tda998x.c @@ -0,0 +1,175 @@ +/* + * ALSA SoC TDA998x CODEC + * + * Copyright (C) 2015 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 <linux/of.h> +#include <linux/of_device.h> +#include <sound/pcm_params.h> +#include <sound/tda998x.h> + +/* functions in tda998x_drv */ +static get_audio_var_t get_audio_var; +static set_audio_input_t set_audio_input; + +static int tda998x_codec_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_pcm_hw_constraint_list *rate_constraints; + u8 *sad; /* Short Audio Descriptor (3 bytes) */ +#define SAD_MX_CHAN_I 0 /* max number of chennels - 1 */ +#define SAD_RATE_MASK_I 1 /* rate mask */ +#define SAD_FMT_I 2 /* formats */ +#define SAD_FMT_16 0x01 +#define SAD_FMT_20 0x02 +#define SAD_FMT_24 0x04 + u64 formats; + int ret; + static const u32 hdmi_rates[] = { + 32000, 44100, 48000, 88200, 96000, 176400, 192000 + }; + + /* get the EDID values and the rate constraints buffer */ + ret = get_audio_var(dai->dev, &sad, &rate_constraints); + if (ret < 0) + return ret; /* no screen */ + + /* convert the EDID values to audio constraints */ + rate_constraints->list = hdmi_rates; + rate_constraints->count = ARRAY_SIZE(hdmi_rates); + rate_constraints->mask = sad[SAD_RATE_MASK_I]; + snd_pcm_hw_constraint_list(runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + rate_constraints); + + formats = 0; + if (sad[SAD_FMT_I] & SAD_FMT_16) + formats |= SNDRV_PCM_FMTBIT_S16_LE; + if (sad[SAD_FMT_I] & SAD_FMT_20) + formats |= SNDRV_PCM_FMTBIT_S20_3LE; + if (sad[SAD_FMT_I] & SAD_FMT_24) + formats |= SNDRV_PCM_FMTBIT_S24_LE | + SNDRV_PCM_FMTBIT_S24_3LE | + SNDRV_PCM_FMTBIT_S32_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, sad[SAD_MX_CHAN_I]); + return 0; +} + +static int tda998x_codec_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + return set_audio_input(dai->dev, dai->id, + params_rate(params), + params_format(params)); +} + +static void tda998x_codec_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + set_audio_input(dai->dev, PORT_NONE, 0, 0); +} + +static const struct snd_soc_dai_ops tda998x_codec_ops = { + .startup = tda998x_codec_startup, + .hw_params = tda998x_codec_hw_params, + .shutdown = tda998x_codec_shutdown, +}; + +#define TDA998X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S20_3LE | \ + SNDRV_PCM_FMTBIT_S24_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +static struct snd_soc_dai_driver tda998x_dais[] = { + { + .name = "spdif-hifi", + .id = PORT_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 = &tda998x_codec_ops, + }, + { + .name = "i2s-hifi", + .id = PORT_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 = &tda998x_codec_ops, + }, +}; + +static const struct snd_soc_dapm_widget tda998x_widgets[] = { + SND_SOC_DAPM_OUTPUT("hdmi-out"), +}; +static const struct snd_soc_dapm_route tda998x_routes[] = { + { "hdmi-out", NULL, "HDMI I2S Playback" }, + { "hdmi-out", NULL, "HDMI SPDIF Playback" }, +}; + +static struct snd_soc_codec_driver tda998x_codec_drv = { + .dapm_widgets = tda998x_widgets, + .num_dapm_widgets = ARRAY_SIZE(tda998x_widgets), + .dapm_routes = tda998x_routes, + .num_dapm_routes = ARRAY_SIZE(tda998x_routes), + .ignore_pmdown_time = true, +}; + +int tda9998x_codec_register(struct device *dev, + get_audio_var_t get_audio_var_i, + set_audio_input_t set_audio_input_i) +{ + get_audio_var = get_audio_var_i; + set_audio_input = set_audio_input_i; + return snd_soc_register_codec(dev, + &tda998x_codec_drv, + tda998x_dais, ARRAY_SIZE(tda998x_dais)); +} +EXPORT_SYMBOL(tda9998x_codec_register); + +void tda9998x_codec_unregister(struct device *dev) +{ + snd_soc_unregister_codec(dev); +} +EXPORT_SYMBOL(tda9998x_codec_unregister); + +static int __init tda998x_codec_init(void) +{ + return 0; +} +static void __exit tda998x_codec_exit(void) +{ +} +module_init(tda998x_codec_init); +module_exit(tda998x_codec_exit); + +MODULE_AUTHOR("Jean-Francois Moine moinejf@free.fr"); +MODULE_DESCRIPTION("TDA998X CODEC"); +MODULE_LICENSE("GPL");