Re: [alsa-devel] [PATCH v2] ASoC: Add support for NAU8825 codec to ASoC

From: Chih-Chiang Chang
Date: Tue Jul 07 2015 - 04:04:28 EST

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On 2015/4/20 äå 10:57, Lars-Peter Clausen wrote:
> On 04/16/2015 11:56 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@xxxxxxxxxxx>
>
> Looks pretty good now.
>
>> ---
>> v2->v1:
>> - fixes according to Lars-Peter Clausen's review comments
>> - removes unused platform data file
>> - corrects the naming of DAPM input widget
>> - fixes some wrong coding of SOC widgets and other codes
>> - adds definition and remark for config FLL clock
>> - moves the code of reset hardware registers from codec_probe() to i2c_probe()
>> - removes unused codes
>>
> [...]
>> +static const struct snd_kcontrol_new nau8825_snd_controls[] = {
>> +
>
> Here and a few other places you leave the first line in the struct
> declaration empty. No need for that.
>
Removed the space line in declarations.

>> + SOC_SINGLE_TLV("MIC Volume", NAU8825_ADC_DGAIN_CTRL,
>> + NAU8825_ADC_DGAIN_SFT,
>> + NAU8825_ADC_VOL_RSCL_RANGE, 0, adc_vol_tlv),
>> + SOC_DOUBLE_TLV("HP Volume", NAU8825_HSVOL_CTRL,
>> + NAU8825_L_HSVOL_SFT, NAU8825_R_HSVOL_SFT,
>> + NAU8825_VOL_RSCL_RANGE, 1, out_hp_vol_tlv),
>> +};
> [...]
>> +
>> +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);
>
> This seems to use some constant dividers and multipliers for the FLL. Does
> this expect a specific reference clock from somewhere?
>
Yes, current code expects ASoC will send 12 MHz MCLK to the codec. But
finally, we will support all possible reference clock frequencies.

>> + /* 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);
>> +}
>> +
>> +static void set_sys_clk(struct snd_soc_codec *codec, int sys_clk)
>> +{
>> + struct nau8825_priv *nau8825 = snd_soc_codec_get_drvdata(codec);
>> +
>> + pr_debug("%s :: sys_clk=%x\n", __func__, sys_clk);
>> + switch (sys_clk) {
>> + case NAU8825_INTERNALCLOCK:
>> + regmap_update_bits(nau8825->regmap, NAU8825_CLK_DIVIDER,
>> + NAU8825_SYSCLK_EN_MASK, NAU8825_SYSCLK_DIS);
>> + regmap_update_bits(nau8825->regmap, NAU8825_FLL_6,
>> + NAU8825_DCO_EN_MASK, NAU8825_DCO_EN);
>> + regmap_update_bits(nau8825->regmap, NAU8825_CLK_DIVIDER,
>> + NAU8825_SYSCLK_EN_MASK, NAU8825_SYSCLK_EN);
>> + break;
>> + case NAU8825_MCLK:
>> + default:
>> + regmap_update_bits(nau8825->regmap, NAU8825_CLK_DIVIDER,
>> + NAU8825_SYSCLK_EN_MASK, NAU8825_SYSCLK_DIS);
>> + regmap_update_bits(nau8825->regmap, NAU8825_FLL_6,
>> + NAU8825_DCO_EN_MASK, NAU8825_DCO_DIS);
>> + regmap_update_bits(nau8825->regmap, NAU8825_CLK_DIVIDER,
>> + NAU8825_SYSCLK_EN_MASK, NAU8825_SYSCLK_EN);
>> + break;
>> + }
>> +}
>> +
>> +static int nau8825_dai_set_sysclk(struct snd_soc_dai *dai,
>> + int clk_id, unsigned int freq, int dir)
>> +{
>> + struct snd_soc_codec *codec = dai->codec;
>> +
>> + switch (clk_id) {
>> + case NAU8825_MCLK:
>> + config_fll_clk_12m(codec);
>> + set_sys_clk(codec, clk_id);
>
> Maybe just inline the contents of set_sys_clk here ...
>
Since another code as below still uses set_sys_clk(), we reserve
function calling here.

case SND_SOC_BIAS_OFF:
dev_dbg(codec->dev, "###nau8825_set_bias_level OFF\n");
set_sys_clk(codec, NAU8825_INTERNALCLOCK);
regmap_update_bits(nau8825->regmap, NAU8825_BIAS_ADJ,
NAU8825_VMID_MASK, NAU8825_VMID_DIS);

>> + break;
>> + case NAU8825_INTERNALCLOCK:
>> + set_sys_clk(codec, clk_id);
>
> ... and here
>
The same answer to previous.

>> + break;
>> + default:
>> + dev_err(codec->dev, "Wrong clock src\n");
>> + return -EINVAL;
>> + }
>> + return 0;
>> +}
> [...]
> > +static const struct reg_default nau8825_reg[] = {
> > + /* enable clock source */
> > + {0x0001, 0x07FF},
> > + /* enable VMID and Bias */
> > + {0x0076, 0x3140},
> > + /* setup clock divider */
> > + {0x0003, 0x0050},
> > + /* jack detection configuration */
> > + {0x000C, 0x0004},
> > + {0x000D, 0x00E0},
> > + {0x000F, 0x0801},
> > + {0x0012, 0x0010},
> > + /* keypad detection configuration */
> > + {0x0013, 0x0280},
> > + {0x0014, 0x7310},
> > + {0x0015, 0x050E},
> > + {0x0016, 0x1B2A},
> > + /* audio format configuration */
> > + {0x001A, 0x0800},
> > + {0x001C, 0x000E},
> > + {0x001D, 0x0010},
> > + /* sampling rate control */
> > + {0x002B, 0x0012},
> > + /* DAC sampling rate control */
> > + {0x002C, 0x0082},
> > + /* ADC and DAC mixer control */
> > + {0x0030, 0x00D2},
> > + {0x0033, 0x00CF},
> > + {0x0034, 0x02CF},
> > + /* DAC class-G control */
> > + {0x006A, 0x1003},
> > + {0x0050, 0x2007},
> > + /* ADC PGA control */
> > + {0x0072, 0x0260},
> > + /* DAC power down enabled */
> > + {0x0080, 0x03A0},
> > + /* enable DAC clock */
> > + {0x0073, 0x336C},
> > + /* enable MIC Bias */
> > + {0x0074, 0x5502},
> > + /* powerup output driver */
> > + {0x007F, 0x473C},
> > + {0x007F, 0x473F},
> > + /* DAC power down disabled */
> > + {0x0080, 0x00A0},
> > + /* adjust MIC Bias */
> > + {0x0066, 0x2060},
> > + {0x0066, 0x2060},
> > + {0x0066, 0x0060},
> > +};
>
> The register defaults should hold the content of the registers in the
> power-on reset state of the chip. This is not meant to be used as a
> initialization sequence.
>
Modified code to make register defaults hold the register values in the
power-on reset state.

static const struct reg_default nau8825_reg[] = {
{0x000, 0x0000},
{0x001, 0x00ff},
{0x003, 0x0050},
{0x004, 0x0000},
{0x005, 0x3126},
{0x006, 0x0008},
{0x007, 0x0010},
{0x008, 0x0000},
{0x009, 0x6000},
{0x00a, 0xf13c},
{0x00c, 0x000c},
{0x00d, 0x0000},
{0x00f, 0x0800},
{0x010, 0x0000},
{0x011, 0x0000},
{0x012, 0x0010},
{0x013, 0x0015},
{0x014, 0x0110},
{0x015, 0x0000},
...

> > +
> [...]
>> +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,
>> + },
>
> The indent is a bit strange above.
>
Fixed the code as below.

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,
}
};

>> + .ops = &nau8825_dai_ops,
>> + }
>> +};
>> +
>> +
>> +static int nau8825_i2c_probe(struct i2c_client *i2c,
>> + const struct i2c_device_id *i2c_id)
>> +{
>> + struct nau8825_priv *nau8825;
>> + int i, ret;
>> +
>> + nau8825 = devm_kzalloc(&i2c->dev, sizeof(*nau8825),
>> + GFP_KERNEL);
>> + if (nau8825 == NULL)
>> + return -ENOMEM;
>> + nau8825->i2c = i2c;
>> + i2c_set_clientdata(i2c, nau8825);
>> + nau8825->regmap = devm_regmap_init_i2c(i2c, &nau8825_regmap);
>> + if (IS_ERR(nau8825->regmap)) {
>> + ret = PTR_ERR(nau8825->regmap);
>> + dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
>> + goto err_enable;
>
> Since there is nothing to do at err_enable, just return ret directly and get
> rid of the label.
>
Modified the code as below.

i2c_set_clientdata(i2c, nau8825);
nau8825->regmap = devm_regmap_init_i2c(i2c, &nau8825_regmap);
if (IS_ERR(nau8825->regmap)) {
ret = PTR_ERR(nau8825->regmap);
dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
return ret;
}
/* software reset */
regmap_write(nau8825->regmap, NAU8825_RESET, 0x00);
regmap_write(nau8825->regmap, NAU8825_RESET, 0x00);

/* register sound card */
ret = snd_soc_register_codec(&i2c->dev, &soc_codec_driver_nau8825,
nau8825_dai_driver,
ARRAY_SIZE(nau8825_dai_driver));
return ret;
}

>> + }
>> + /* 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));
>> +err_enable:
>> + return ret;
>> +}
>> +
> [...]
>> +#define NAU8825_RATES SNDRV_PCM_RATE_8000_192000
>> +#define NAU8825_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE \
>> + | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)
>
> These defines should probably be moved to the C file close to their users.
>
Move the defines to C file as below.

#define NAU8825_RATES SNDRV_PCM_RATE_8000_192000
#define NAU8825_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S20_3LE \
| SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops nau8825_dai_ops = {
.trigger = nau8825_trigger,
.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",

>> +
>> +struct nau8825_priv {
>> + struct snd_soc_codec *codec;
>> + struct regmap *regmap;
>> + struct i2c_client *i2c;
>> + struct snd_soc_jack *jack;
>> + struct delayed_work jack_detect_work;
>
> All fields in here except for the regmap field are still unused.
>
Remove some unused field. But the i2c field is used in nau8825_i2c_probe().

struct nau8825_priv {
struct regmap *regmap;
struct i2c_client *i2c;
};

static int nau8825_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
struct nau8825_priv *nau8825;
int ret;

nau8825 = devm_kzalloc(&i2c->dev, sizeof(*nau8825),
GFP_KERNEL);
if (nau8825 == NULL)
return -ENOMEM;
nau8825->i2c = i2c;
i2c_set_clientdata(i2c, nau8825);
nau8825->regmap = devm_regmap_init_i2c(i2c, &nau8825_regmap);

>> +};
>> +#endif /* _NAU8825_H */
>>
>
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Next message: wenwei tao: "Re: [RFC PATCH 6/6] powerpc/kvm: change the condition of identifying hugetlb vm"
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