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SubjectRe: [PATCH] ASoC: Add support for NAU8825 codec to ASoC


On 2015/4/10 下午 04:38, Lars-Peter Clausen wrote:
> On 04/10/2015 09:21 AM, Chih-Chiang Chang wrote:
>> The NAU88L25 is an ultra-low power high performance audio codec designed
>> for smartphone, tablet PC, and other portable devices by Nuvoton, now
>> add linux driver support for it.
>>
>> Signed-off-by: Chih-Chiang Chang <ccchang12@nuvoton.com>
>> ---
>> include/sound/nau8825_plat.h | 22 ++
>> sound/soc/codecs/Kconfig | 5 +
>> sound/soc/codecs/Makefile | 2 +
>> sound/soc/codecs/nau8825.c | 593 +++++++++++++++++++++++++++++++++++++++++++
>> sound/soc/codecs/nau8825.h | 150 +++++++++++
>> 5 files changed, 772 insertions(+)
>> create mode 100644 include/sound/nau8825_plat.h
>> create mode 100644 sound/soc/codecs/nau8825.c
>> create mode 100644 sound/soc/codecs/nau8825.h
>>
>> diff --git a/include/sound/nau8825_plat.h b/include/sound/nau8825_plat.h
>> new file mode 100644
>> index 0000000..87afcd3
>> --- /dev/null
>> +++ b/include/sound/nau8825_plat.h
>
> the preferred place for platform_data files is include/linux/platform_data/,
> but the driver doesn't seem to use the platform data anyway, so maybe drop it?

The data is reserved for future use, so drop it now.

For the preferred place for platform_data files, there are more than 300
files in the sound/soc/codecs folder. But I find only few files refer
the platform_data files in include/linux/platform_data/ folder,
most files put platform_data files in include/sound/ folder.

cczhang@MS00-Linux:~/broonie_linux/sound/sound/soc/codecs$ grep -nr
"linux/platform_data/" *
adau1761.c:20:#include <linux/platform_data/adau17x1.h>
adau1781.c:20:#include <linux/platform_data/adau17x1.h>
adau17x1.h:5:#include <linux/platform_data/adau17x1.h>
adau1977.c:16:#include <linux/platform_data/adau1977.h>
ssm2518.c:17:#include <linux/platform_data/ssm2518.h>

>
> [...]
>> diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
>> new file mode 100644
>> index 0000000..a8c8f59
>> --- /dev/null
>> +++ b/sound/soc/codecs/nau8825.c
>> @@ -0,0 +1,593 @@
>> +/*
>> + * linux/sound/soc/codecs/nau8825.c
>
> No need to include the file path in the header of the file, this will just
> become outdated if the file is ever moved.

Removed the file path in source.

>
> [...]
>> +static int nau8825_hw_params(struct snd_pcm_substream *substream,
>> + struct snd_pcm_hw_params *params,
>> + struct snd_soc_dai *dai);
>> +static int nau8825_set_dai_fmt(struct snd_soc_dai *codec_dai,
>> + unsigned int fmt);
>> +static int nau8825_set_bias_level(struct snd_soc_codec *codec,
>> + enum snd_soc_bias_level level);
>> +static int nau8825_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
>> + unsigned int freq, int dir);
>
> These forward declarations don't seem to be necessary.

Removed.

>
> [...]
>> +static const struct snd_kcontrol_new nau8825_snd_controls[] = {
>> +
>
>> + SOC_SINGLE("HP Class OP", NAU8825_CLASS_G_CTRL, NAU8825_CLASS_G_SHIFT,
>> + 1, 0),
>
> What is "Class OP"?

"Class OP" means amplifier. The code is removed due to DAC DAPM widgets
have the same bit control for NAU8825_CLASS_G_CTRL.

>
>> + SOC_SINGLE("DAC Right", NAU8825_DAC_CTRL, NAU8825_DAC_R_SFT, 1, 0),
>> + SOC_SINGLE("DAC Left", NAU8825_DAC_CTRL, NAU8825_DAC_L_SFT, 1, 0),
>
> The same bits are controlled by the DAC DAPM widgets, there shouldn't be any
> controls for them.

Removed.

>
>> + SOC_SINGLE("DAC Right Clock", NAU8825_DAC_CTRL, NAU8825_DAC_CLK_R_SFT,
>> + 1, 0),
>> + SOC_SINGLE("DAC Left Clock", NAU8825_DAC_CTRL, NAU8825_DAC_CLK_L_SFT,
>> + 1, 0),
>
> The clock controls should probably not be user controllable but rather be
> DAPM supply widgets.

The code is not used, removed.

>
>> +};
>> +
>> +static const struct snd_kcontrol_new nau8825_hpo_mix[] = {
>> + SOC_DAPM_SINGLE("HP L Switch", NAU8825_HSVOL_CTRL,
>> + NAU8825_L_MUTE_SFT, 1, 1),
>> + SOC_DAPM_SINGLE("HP R Switch", NAU8825_HSVOL_CTRL,
>> + NAU8825_R_MUTE_SFT, 1, 1),
>> +};
>> +
>> +static const struct snd_soc_dapm_widget nau8825_dapm_widgets[] = {
>> +
>> + SND_SOC_DAPM_INPUT("Mic Jack"),
>
> Input and output widgets should have the same name as the matching pin of
> the CODEC.

Modified as below.

SND_SOC_DAPM_INPUT("MIC"),

>
>> + SND_SOC_DAPM_MICBIAS("MIC BIAS", NAU8825_BOOST, NAU8825_G_BIAS_SFT, 0),
>
> New drivers shouldn't use DAPM_MICBIAS widgets as they are known to be
> broken. Use a DAPM_SUPPLY widget instead.

Modified as below.

SND_SOC_DAPM_SUPPLY("MIC BIAS", NAU8825_BOOST, NAU8825_G_BIAS_SFT, 0,
NULL, 0),

>
>> + SND_SOC_DAPM_SUPPLY("micbias", SND_SOC_NOPM, 0, 0,
>> + NULL, SND_SOC_DAPM_PRE_PMU
>> + | SND_SOC_DAPM_POST_PMD),
>> + SND_SOC_DAPM_SUPPLY("vmid", SND_SOC_NOPM, 0, 0, NULL,
>> + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
>
> Both the vmid and micbias supply seem to be unused and don't do anything either.

Removed.

>
>> + /* ADCs */
>> + SND_SOC_DAPM_ADC("ADC L", NULL, SND_SOC_NOPM, 0, 0),
>> + SND_SOC_DAPM_ADC("ADC R", NULL, SND_SOC_NOPM, 0, 0),
>> + /* ADC IF1 */
>> + SND_SOC_DAPM_PGA("IF1 ADC", SND_SOC_NOPM, 0, 0, NULL, 0),
>
> This one seems to be unused, and doesn't do anything either.

Removed.

>
>> + /* Audio Interface */
>> + SND_SOC_DAPM_AIF_IN("AIF1RX", "AIF1 Playback", 0, SND_SOC_NOPM, 0, 0),
>> + SND_SOC_DAPM_AIF_OUT("AIF1TX", "AIF1 Capture", 0, SND_SOC_NOPM, 0, 0),
>> + /* DACs */
>> + SND_SOC_DAPM_DAC_E("DAC L1", NULL, NAU8825_DAC_CTRL,
>> + NAU8825_DAC_L_SFT, 0, NULL,
>> + SND_SOC_DAPM_PRE_PMD),
>
> Just use DAC instead of DAC_E if you don't have to implement a callback

Modified as below.

SND_SOC_DAPM_DAC("DAC L1", NULL, NAU8825_DAC_CTRL,
NAU8825_DAC_L_SFT, 0),

>
>> + SND_SOC_DAPM_DAC_E("DAC R1", NULL, NAU8825_DAC_CTRL,
>> + NAU8825_DAC_R_SFT, 0, NULL,
>> + SND_SOC_DAPM_PRE_PMD),
>
> Same here.

Modified as below.

SND_SOC_DAPM_DAC("DAC R1", NULL, NAU8825_DAC_CTRL,
NAU8825_DAC_R_SFT, 0),

>
>> + /* SPO/HPO/LOUT/Mono Mixer */
>> + SND_SOC_DAPM_MIXER("HPO MIX", SND_SOC_NOPM, 0, 0, nau8825_hpo_mix,
>> + ARRAY_SIZE(nau8825_hpo_mix)),
>> + SND_SOC_DAPM_PGA_S("HP amp", 1, NAU8825_CLASS_G_CTRL,
>> + NAU8825_CLASS_G_SHIFT, 0, NULL, 0),
>
> No need for _S if there is no sub-sequencing involved.

Modified as below.

SND_SOC_DAPM_SUPPLY("HP amp", NAU8825_CLASS_G_CTRL,
NAU8825_CLASS_G_SHIFT, 0, NULL, 0),

>
>> + /* Output Lines */
>> + SND_SOC_DAPM_OUTPUT("HPOL"),
>> + SND_SOC_DAPM_OUTPUT("HPOR"),
>> +};
>> +
> [...
>> +static int nau8825_hw_params(struct snd_pcm_substream *substream,
>> + struct snd_pcm_hw_params *params,
>> + struct snd_soc_dai *tmp)
>> +{
>> + struct snd_soc_pcm_runtime *rtd = substream->private_data;
>> + struct snd_soc_codec *codec = rtd->codec;
>
>
> rtd->codec does not necessarily point to your CODEC device, use dai->codec
> instead. As rule of thumb you should never have to look at the
> snd_soc_pcm_runtime in a CODEC driver.
>

Modified as below.

static int nau8825_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;

>
> [...]
>> +
>> +static void config_fll_clk_12m(struct snd_soc_codec *codec)
>> +{
>> + snd_soc_update_bits(codec, NAU8825_CLK_DIVIDER, 0x000F, 0x0003);
>> + snd_soc_update_bits(codec, NAU8825_FL_1, 0x007F, 0x0001);
>> + snd_soc_write(codec, NAU8825_FL_2, 0xC49B);
>> + snd_soc_update_bits(codec, NAU8825_FL_3, 0x03FF, 0x0020);
>> + snd_soc_update_bits(codec, NAU8825_FL_4, 0x0C00, 0x0800);
>> + snd_soc_update_bits(codec, NAU8825_FL_5, 0x2000, 0x0000);
>> + snd_soc_update_bits(codec, NAU8825_FL_6, 0x4000, 0x4000);
>
> So what do these magic values do?

Modified as below, add definition and remark.

static void config_fll_clk_12m(struct snd_soc_codec *codec)
{
struct nau8825_priv *nau8825 = snd_soc_codec_get_drvdata(codec);

regmap_update_bits(nau8825->regmap, NAU8825_CLK_DIVIDER,
NAU8825_CLK_MCLK_SRC_MASK, 0x0003);
regmap_update_bits(nau8825->regmap, NAU8825_FLL_1,
NAU8825_FLL_RATIO_MASK, 0x0001);
/* FLL 16-bit fractional input */
regmap_write(nau8825->regmap, NAU8825_FLL_2, 0xC49B);
/* FLL 10-bit integer input */
regmap_update_bits(nau8825->regmap, NAU8825_FLL_3,
NAU8825_FLL_INTEGER_MASK, 0x0020);
/* FLL pre-scaler */
regmap_update_bits(nau8825->regmap, NAU8825_FLL_4,
NAU8825_FLL_REF_DIV_MASK, 0x0800);
/* select divied VCO input */
regmap_update_bits(nau8825->regmap, NAU8825_FLL_5,
NAU8825_FLL_FILTER_SW_MASK, 0x0000);
/* FLL sigma delta modulator enable */
regmap_update_bits(nau8825->regmap, NAU8825_FLL_6,
NAU8825_SDM_EN_MASK, 0x4000);

>
>> +}
>> +
>> +void set_sys_clk(struct snd_soc_codec *codec, int sys_clk)
>
> static

Modified as below.

static void set_sys_clk(struct snd_soc_codec *codec, int sys_clk)

>
>> +{
>> + pr_debug("%s :: sys_clk=%x\n", __func__, sys_clk);
> [...
>> +static int nau8825_codec_suspend(struct snd_soc_codec *codec)
>> +{
>> + nau8825_set_bias_level(codec, SND_SOC_BIAS_OFF);
>> + return 0;
>> +}
>
> set the suspend_bias_off flag in your codec driver to let the core take care
> of this.

Removed nau8825_codec_suspend() and added suspend_bias_off flag in
soc_codec_driver_nau8825.

.remove = nau8825_codec_remove,
- .suspend = nau8825_codec_suspend,
- .resume = nau8825_resume,
+ .suspend_bias_off = true,
.set_bias_level = nau8825_set_bias_level,
.controls = nau8825_snd_controls,
.num_controls = ARRAY_SIZE(nau8825_snd_controls),

>
>> +
>> +static int nau8825_resume(struct snd_soc_codec *codec)
>> +{
>> + nau8825_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
>> + return 0;
>> +}
>
> This is not necessary the core already takes care of it.

Removed.

>
>> +
> [...]
>> +static int nau8825_codec_probe(struct snd_soc_codec *codec)
>> +{
>> + int i;
>> + struct nau8825_priv *nau8825;
>> +
>> + nau8825 = snd_soc_codec_get_drvdata(codec);
>> + nau8825->codec = codec;
>> + /*writing initial register values to the codec*/
>> + for (i = 0; i < ARRAY_SIZE(nau8825_reg); i++)
>> + snd_soc_write(codec, nau8825_reg[i].reg, nau8825_reg[i].def);
>
> If that is really necessary use regmap_sync() and preferably in the i2c
> probe function. But I'd expect that a soft reset should put the device in
> the default register configuration?

About the regmap_sync(), I cannot find it in Linux. Do you mean the
regcache_sync()? But it is used to sync the register cache with the
hardware, not set reg_defaults array to hardware.

Remove nau8825_codec_probe() and add below code in nau8825_i2c_probe().

dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
goto err_enable;
}
+ /* software reset */
+ regmap_write(nau8825->regmap, NAU8825_RESET, 0x01);
+ regmap_write(nau8825->regmap, NAU8825_RESET, 0x02);
+ /*writing initial register values to the codec*/
+ for (i = 0; i < ARRAY_SIZE(nau8825_reg); i++)
+ regmap_write(nau8825->regmap, nau8825_reg[i].reg,
+ nau8825_reg[i].def);
+
ret = snd_soc_register_codec(&i2c->dev, &soc_codec_driver_nau8825,
nau8825_dai_driver,
ARRAY_SIZE(nau8825_dai_driver));

>
>> + return 0;
>> +}
>> +
> [...]
>> +static struct snd_soc_codec_driver soc_codec_driver_nau8825 = {
>
> const

Modified as below.

static const struct snd_soc_codec_driver soc_codec_driver_nau8825 = {

>
>> + .probe = nau8825_codec_probe,
>> + .remove = nau8825_codec_remove,
>> + .suspend = nau8825_codec_suspend,
>> + .resume = nau8825_resume,
>> + .set_bias_level = nau8825_set_bias_level,
>> + .controls = nau8825_snd_controls,
>> + .num_controls = ARRAY_SIZE(nau8825_snd_controls),
>> + .dapm_widgets = nau8825_dapm_widgets,
>> + .num_dapm_widgets = ARRAY_SIZE(nau8825_dapm_widgets),
>> + .dapm_routes = nau8825_dapm_routes,
>> + .num_dapm_routes = ARRAY_SIZE(nau8825_dapm_routes),
>> +};
>> +
>
>> +static struct snd_soc_dai_ops nau8825_dai_ops = {
>
> const

Modified as below.

static const struct snd_soc_dai_ops nau8825_dai_ops = {

>
>> + .hw_params = nau8825_hw_params,
>> + .set_sysclk = nau8825_dai_set_sysclk,
>> + .set_fmt = nau8825_set_dai_fmt,
>> + .digital_mute = nau8825_dac_mute,
>> +};
>> +
>> +static struct snd_soc_dai_driver nau8825_dai_driver[] = {
>> + {
>> + .name = "nau8825-aif1",
>> + .playback = {
>> + .stream_name = "AIF1 Playback",
>> + .channels_min = 1,
>> + .channels_max = 2,
>> + .rates = NAU8825_RATES,
>> + .formats = NAU8825_FORMATS,
>> + },
>> + .capture = {
>> + .stream_name = "AIF1 Capture",
>> + .channels_min = 1,
>> + .channels_max = 2,
>> + .rates = NAU8825_RATES,
>> + .formats = NAU8825_FORMATS,
>> + },
>> + .ops = &nau8825_dai_ops,
>> + }
>> +};
>> +
>> +
>> +static int nau8825_i2c_probe(struct i2c_client *i2c,
>> + const struct i2c_device_id *i2c_id)
>> +{
>> + struct nau8825_platform_data *pdata = dev_get_platdata(&i2c->dev);
>> + struct nau8825_priv *nau8825;
>> + int ret;
>> +
>> + nau8825 = devm_kzalloc(&i2c->dev, sizeof(struct nau8825_priv),
>
> preferred form for this is sizeof(*nau8825)

Modified as below.

nau8825 = devm_kzalloc(&i2c->dev, sizeof(*nau8825),

>
> [...]
>> +MODULE_DESCRIPTION("ASoC NAU8825 codec driver");
>> +MODULE_AUTHOR("Nuvoton");
>> +MODULE_LICENSE("GPL v2");
>> +
>> +
>
> No need for the extra new lines at the end

Removed the new lines.

>
>> diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h
>> new file mode 100644
>> index 0000000..b16d4d1
>> --- /dev/null
>> +++ b/sound/soc/codecs/nau8825.h
>> @@ -0,0 +1,150 @@
>> +/*
> [...]
>> +
>> +struct nau8825_priv {
>> + struct snd_soc_codec *codec;
>> + struct nau8825_platform_data pdata;
>> + struct regmap *regmap;
>> + struct i2c_client *i2c;
>> + struct snd_soc_jack *hp_jack;
>> + struct snd_soc_jack *mic_jack;
>> + struct delayed_work delayed_work;
>> +
>> + struct workqueue_struct *workqueue;
>> + struct mutex mutex;
>> + unsigned int irq;
>> + bool jd_status;
>> + bool bp_status;
>> + int jack_type;
>> +};
> It looks like pretty much all of the fields in the struct are not used by
> the driver.

Removed some field and modified as below.

@@ -136,15 +163,7 @@ struct nau8825_priv {
struct nau8825_platform_data pdata;
struct regmap *regmap;
struct i2c_client *i2c;
- struct snd_soc_jack *hp_jack;
- struct snd_soc_jack *mic_jack;
- struct delayed_work delayed_work;
-
- struct workqueue_struct *workqueue;
- struct mutex mutex;
- unsigned int irq;
- bool jd_status;
- bool bp_status;
- int jack_type;
+ struct snd_soc_jack *jack;
+ struct delayed_work jack_detect_work;
};

>> +#endif /* _NAU8825_H */
>>
>


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