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ASoC: tegra: Add Tegra210 based DMIC driver

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The Digital MIC (DMIC) Controller is used to interface with Pulse Density
Modulation (PDM) input devices. The DMIC controller implements a converter
to convert PDM signals to Pulse Code Modulation (PCM) signals. From signal
flow perspective, the DMIC can be viewed as a PDM receiver.

This patch registers DMIC component with ASoC framework. The component
driver exposes DAPM widgets, routes and kcontrols for the device. The DAI
driver exposes DMIC interfaces, which can be used to connect different
components in the ASoC layer. Makefile and Kconfig support is added to
allow to build the driver. The DMIC devices can be enabled in the DT via
"nvidia,tegra210-dmic" compatible string. This driver can be used for
Tegra186 and Tegra194 chips as well.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1595134890-16470-4-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sameer Pujar
2020-07-19 10:31:22 +05:30
parent 8e36d59756
commit dfc3d8db24
2 changed files with 38 additions and 101 deletions
Download Patch File Download Diff File Expand all files Collapse all files

134
sound/soc/tegra/tegra210_dmic.c
View File

@@ -1,10 +1,9 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* tegra210_dmic.c - Tegra210 DMIC driver
*
* Copyright (c) 2014-2020 NVIDIA CORPORATION. All rights reserved.
*
*/
//
// tegra210_dmic.c - Tegra210 DMIC driver
//
// Copyright (c) 2020 NVIDIA CORPORATION. All rights reserved.
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/module.h>
@@ -69,12 +68,6 @@ static int tegra210_dmic_runtime_resume(struct device *dev)
return 0;
}
static const unsigned int tegra210_dmic_fmts[] = {
0,
TEGRA_ACIF_BITS_16,
TEGRA_ACIF_BITS_32,
};
static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
@@ -90,8 +83,6 @@ static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
channels = params_channels(params);
cif_conf.audio_ch = channels;
if (dmic->audio_ch_override)
cif_conf.audio_ch = dmic->audio_ch_override;
switch (dmic->ch_select) {
case DMIC_CH_SELECT_LEFT:
@@ -107,8 +98,6 @@ static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
}
srate = params_rate(params);
if (dmic->srate_override)
srate = dmic->srate_override;
/*
* DMIC clock rate is a multiple of 'Over Sampling Ratio' and
@@ -137,7 +126,7 @@ static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
/*
* Use LP filter gain register to apply boost.
* Boost Gain control has 100x factor.
* Boost Gain Volume control has 100x factor.
*/
if (dmic->boost_gain)
gain_q23 = (gain_q23 * dmic->boost_gain) / 100;
@@ -154,13 +143,9 @@ static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
break;
default:
dev_err(dai->dev, "unsupported format!\n");
return -ENOTSUPP;
return -EOPNOTSUPP;
}
if (dmic->audio_bits_override)
cif_conf.audio_bits =
tegra210_dmic_fmts[dmic->audio_bits_override];
cif_conf.client_bits = TEGRA_ACIF_BITS_24;
cif_conf.mono_conv = dmic->mono_to_stereo;
cif_conf.stereo_conv = dmic->stereo_to_mono;
@@ -176,7 +161,7 @@ static int tegra210_dmic_get_control(struct snd_kcontrol *kcontrol,
struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
if (strstr(kcontrol->id.name, "Boost Gain"))
if (strstr(kcontrol->id.name, "Boost Gain Volume"))
ucontrol->value.integer.value[0] = dmic->boost_gain;
else if (strstr(kcontrol->id.name, "Channel Select"))
ucontrol->value.integer.value[0] = dmic->ch_select;
@@ -184,12 +169,6 @@ static int tegra210_dmic_get_control(struct snd_kcontrol *kcontrol,
ucontrol->value.integer.value[0] = dmic->mono_to_stereo;
else if (strstr(kcontrol->id.name, "Stereo To Mono"))
ucontrol->value.integer.value[0] = dmic->stereo_to_mono;
else if (strstr(kcontrol->id.name, "Audio Bit Format"))
ucontrol->value.integer.value[0] = dmic->audio_bits_override;
else if (strstr(kcontrol->id.name, "Sample Rate"))
ucontrol->value.integer.value[0] = dmic->srate_override;
else if (strstr(kcontrol->id.name, "Audio Channels"))
ucontrol->value.integer.value[0] = dmic->audio_ch_override;
else if (strstr(kcontrol->id.name, "OSR Value"))
ucontrol->value.integer.value[0] = dmic->osr_val;
else if (strstr(kcontrol->id.name, "LR Polarity Select"))
@@ -205,7 +184,7 @@ static int tegra210_dmic_put_control(struct snd_kcontrol *kcontrol,
struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
int value = ucontrol->value.integer.value[0];
if (strstr(kcontrol->id.name, "Boost Gain"))
if (strstr(kcontrol->id.name, "Boost Gain Volume"))
dmic->boost_gain = value;
else if (strstr(kcontrol->id.name, "Channel Select"))
dmic->ch_select = ucontrol->value.integer.value[0];
@@ -213,12 +192,6 @@ static int tegra210_dmic_put_control(struct snd_kcontrol *kcontrol,
dmic->mono_to_stereo = value;
else if (strstr(kcontrol->id.name, "Stereo To Mono"))
dmic->stereo_to_mono = value;
else if (strstr(kcontrol->id.name, "Audio Bit Format"))
dmic->audio_bits_override = value;
else if (strstr(kcontrol->id.name, "Sample Rate"))
dmic->srate_override = value;
else if (strstr(kcontrol->id.name, "Audio Channels"))
dmic->audio_ch_override = value;
else if (strstr(kcontrol->id.name, "OSR Value"))
dmic->osr_val = value;
else if (strstr(kcontrol->id.name, "LR Polarity Select"))
@@ -231,19 +204,22 @@ static const struct snd_soc_dai_ops tegra210_dmic_dai_ops = {
.hw_params = tegra210_dmic_hw_params,
};
/*
* Three DAIs are exposed
* 1. "CIF" DAI for connecting with XBAR
* 2. "DAP" DAI for connecting with CODEC
* 3. "DUMMY_SOURCE" can be used when no external
* codec connection is available. In such case
* "DAP" is connected with "DUMMY_SOURCE"
*/
static struct snd_soc_dai_driver tegra210_dmic_dais[] = {
{
.name = "CIF",
.name = "DMIC-CIF",
.capture = {
.stream_name = "DMIC Transmit",
.stream_name = "CIF-Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
},
},
{
.name = "DMIC-DAP",
.capture = {
.stream_name = "DAP-Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
@@ -253,39 +229,19 @@ static struct snd_soc_dai_driver tegra210_dmic_dais[] = {
.ops = &tegra210_dmic_dai_ops,
.symmetric_rates = 1,
},
{
.name = "DAP",
.playback = {
.stream_name = "DMIC Receive",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
},
},
{
.name = "DUMMY_SOURCE",
.capture = {
.stream_name = "Dummy Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
},
}
};
static const struct snd_soc_dapm_widget tegra210_dmic_widgets[] = {
SND_SOC_DAPM_AIF_IN("DMIC TX", NULL, 0, TEGRA210_DMIC_ENABLE, 0, 0),
SND_SOC_DAPM_MIC("Dummy Input", NULL),
SND_SOC_DAPM_AIF_OUT("TX", NULL, 0, TEGRA210_DMIC_ENABLE, 0, 0),
SND_SOC_DAPM_MIC("MIC", NULL),
};
static const struct snd_soc_dapm_route tegra210_dmic_routes[] = {
{ "DMIC TX", NULL, "DMIC Receive" },
{ "DMIC Transmit", NULL, "DMIC TX" },
{ "Dummy Capture", NULL, "Dummy Input" },
{ "XBAR-RX", NULL, "XBAR-Capture" },
{ "XBAR-Capture", NULL, "CIF-Capture" },
{ "CIF-Capture", NULL, "TX" },
{ "TX", NULL, "DAP-Capture" },
{ "DAP-Capture", NULL, "MIC" },
};
static const char * const tegra210_dmic_ch_select[] = {
@@ -297,7 +253,7 @@ static const struct soc_enum tegra210_dmic_ch_enum =
tegra210_dmic_ch_select);
static const char * const tegra210_dmic_mono_conv_text[] = {
"ZERO", "COPY",
"Zero", "Copy",
};
static const char * const tegra210_dmic_stereo_conv_text[] = {
@@ -312,16 +268,6 @@ static const struct soc_enum tegra210_dmic_stereo_conv_enum =
SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_stereo_conv_text),
tegra210_dmic_stereo_conv_text);
static const char * const tegra210_dmic_format_text[] = {
"None",
"16",
"32",
};
static const struct soc_enum tegra210_dmic_format_enum =
SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_format_text),
tegra210_dmic_format_text);
static const char * const tegra210_dmic_osr_text[] = {
"OSR_64", "OSR_128", "OSR_256",
};
@@ -339,7 +285,7 @@ static const struct soc_enum tegra210_dmic_lrsel_enum =
tegra210_dmic_lrsel_text);
static const struct snd_kcontrol_new tegra210_dmic_controls[] = {
SOC_SINGLE_EXT("Boost Gain", 0, 0, MAX_BOOST_GAIN, 0,
SOC_SINGLE_EXT("Boost Gain Volume", 0, 0, MAX_BOOST_GAIN, 0,
tegra210_dmic_get_control, tegra210_dmic_put_control),
SOC_ENUM_EXT("Channel Select", tegra210_dmic_ch_enum,
tegra210_dmic_get_control, tegra210_dmic_put_control),
@@ -349,12 +295,6 @@ static const struct snd_kcontrol_new tegra210_dmic_controls[] = {
SOC_ENUM_EXT("Stereo To Mono",
tegra210_dmic_stereo_conv_enum, tegra210_dmic_get_control,
tegra210_dmic_put_control),
SOC_ENUM_EXT("Audio Bit Format", tegra210_dmic_format_enum,
tegra210_dmic_get_control, tegra210_dmic_put_control),
SOC_SINGLE_EXT("Sample Rate", 0, 0, 48000, 0, tegra210_dmic_get_control,
tegra210_dmic_put_control),
SOC_SINGLE_EXT("Audio Channels", 0, 0, 2, 0, tegra210_dmic_get_control,
tegra210_dmic_put_control),
SOC_ENUM_EXT("OSR Value", tegra210_dmic_osr_enum,
tegra210_dmic_get_control, tegra210_dmic_put_control),
SOC_ENUM_EXT("LR Polarity Select", tegra210_dmic_lrsel_enum,
@@ -428,12 +368,6 @@ static const struct regmap_config tegra210_dmic_regmap_config = {
.cache_type = REGCACHE_FLAT,
};
static const struct of_device_id tegra210_dmic_of_match[] = {
{ .compatible = "nvidia,tegra210-dmic" },
{},
};
MODULE_DEVICE_TABLE(of, tegra210_dmic_of_match);
static int tegra210_dmic_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -499,6 +433,12 @@ static const struct dev_pm_ops tegra210_dmic_pm_ops = {
pm_runtime_force_resume)
};
static const struct of_device_id tegra210_dmic_of_match[] = {
{ .compatible = "nvidia,tegra210-dmic" },
{},
};
MODULE_DEVICE_TABLE(of, tegra210_dmic_of_match);
static struct platform_driver tegra210_dmic_driver = {
.driver = {
.name = "tegra210-dmic",

5
sound/soc/tegra/tegra210_dmic.h
View File

@@ -2,7 +2,7 @@
/*
* tegra210_dmic.h - Definitions for Tegra210 DMIC driver
*
* Copyright (c) 2014-2020 NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2020 NVIDIA CORPORATION. All rights reserved.
*
*/
@@ -71,9 +71,6 @@ enum tegra_dmic_lrsel {
struct tegra210_dmic {
struct clk *clk_dmic;
struct regmap *regmap;
unsigned int audio_ch_override;
unsigned int audio_bits_override;
unsigned int srate_override;
unsigned int mono_to_stereo;
unsigned int stereo_to_mono;
unsigned int boost_gain;