[alsa-devel] [PATCH v4] ASoC: Add MediaTek MT6660 Speaker Amp Driver

[Sriram Periyasamy]

On Tue, Jan 07, 2020 at 11:09:05AM +0800, Jeff Chang wrote:
> From: Jeff Chang <jeff_chang at richtek.com>
> 
> The MT6660 is a boosted BTL class-D amplifier with V/I sensing.
> A built-in DC-DC step-up converter is used to provide efficient
> power for class-D amplifier with multi-level class-G operation.
> The digital audio interface supports I2S, left-justified,
> right-justified, TDM and DSP A/B format for audio in with a data
> out used for chip information like voltage sense and current
> sense, which are able to be monitored via DATAO through proper
> 
> diff --git a/sound/soc/codecs/mt6660.c b/sound/soc/codecs/mt6660.c
> new file mode 100644
> index 0000000..b8fc53b
> --- /dev/null
> +++ b/sound/soc/codecs/mt6660.c
> @@ -0,0 +1,628 @@

> +
> +struct codec_reg_val {
> +	u32 addr;
> +	u32 mask;
> +	u32 data;
> +};

packed structures could have been better.

> +
> +struct reg_size_table {
> +	u32 addr;
> +	u8 size;
> +};

here as well.

> +static int mt6660_get_reg_size(uint32_t addr)
> +{
> +	int i = 0;

redundant initialization.

> +
> +	for (i = 0; i < ARRAY_SIZE(mt6660_reg_size_table); i++) {
> +		if (mt6660_reg_size_table[i].addr == addr)
> +			return mt6660_reg_size_table[i].size;
> +	}
> +	return 1;
> +}
> +
> +static int mt6660_reg_write(void *context, unsigned int reg, unsigned int val)
> +{
> +	struct mt6660_chip *chip = context;
> +	int size = mt6660_get_reg_size(reg);
> +	u8 reg_data[4] = {0};
> +	int i = 0, ret = 0;

redundant initialization.

> +
> +	for (i = 0; i < size; i++)
> +		reg_data[size - i - 1] = (val >> (8 * i)) & 0xff;
> +
> +	ret = i2c_smbus_write_i2c_block_data(chip->i2c, reg, size, reg_data);
> +	if (ret < 0)
> +		return ret;
> +	return 0;

one return can be removed.

> +}
> +
> +static int mt6660_reg_read(void *context, unsigned int reg, unsigned int *val)
> +{
> +	struct mt6660_chip *chip = context;
> +	int size = mt6660_get_reg_size(reg);
> +	int i = 0, ret = 0;

redundant initialization.

> +
> +static int mt6660_codec_dac_event(struct snd_soc_dapm_widget *w,
> +	struct snd_kcontrol *kcontrol, int event)
> +{
> +	switch (event) {
> +	case SND_SOC_DAPM_POST_PMU:
> +		usleep_range(1000, 1100);
> +		break;
> +	}

switch is redundant for one condition.

> +	return 0;
> +}
> +
> +static int mt6660_codec_classd_event(struct snd_soc_dapm_widget *w,
> +	struct snd_kcontrol *kcontrol, int event)
> +{
> +	struct snd_soc_component *component =
> +		snd_soc_dapm_to_component(w->dapm);
> +	int ret = 0;

redundant intialization.

> +static inline int _mt6660_chip_power_on(struct mt6660_chip *chip, int on_off)

inline must here and other places also? Doesn't look like very small code. 
> +{
> +	u8 reg_data = 0;
> +	int ret = 0;
> +

redundant intialization.

> +
> +static int mt6660_apply_plat_data(struct mt6660_chip *chip,
> +		struct snd_soc_component *component)
> +{
> +	size_t i = 0;
> +	int num = chip->plat_data.init_setting_num;
> +	int ret = 0;
> +

redundant intialization and please take care of all places.

> +static inline int _mt6660_chip_sw_reset(struct mt6660_chip *chip)
> +{
> +	int ret;
> +
> +	/* turn on main pll first, then trigger reset */
> +	ret = regmap_write(chip->regmap, 0x03, 0x00);
> +	if (ret < 0)
> +		return ret;
> +	ret = regmap_write(chip->regmap, MT6660_REG_SYSTEM_CTRL, 0x80);

error check not needed?

> +static int mt6660_parse_dt(struct mt6660_chip *chip, struct device *dev)
> +{
> +	struct device_node *np = dev->of_node;
> +	u32 val;
> +	size_t i = 0;
> +
> +	if (!np) {
> +		dev_err(dev, "no device node\n");
> +		return -EINVAL;
> +	}
> +
> +	if (of_property_read_u32(np, "rt,init_setting_num", &val)) {
> +		dev_err(dev, "no init setting\n");
> +		chip->plat_data.init_setting_num = 0;
> +	} else {
> +		chip->plat_data.init_setting_num = val;
> +	}
> +
> +	chip->plat_data.init_setting_addr =
> +		devm_kzalloc(dev, sizeof(u32) *
> +				chip->plat_data.init_setting_num, GFP_KERNEL);
> +	chip->plat_data.init_setting_mask =
> +		devm_kzalloc(dev, sizeof(u32) *
> +				chip->plat_data.init_setting_num, GFP_KERNEL);
> +	chip->plat_data.init_setting_val =
> +		devm_kzalloc(dev, sizeof(u32) *
> +				chip->plat_data.init_setting_num, GFP_KERNEL);
> +

memory allocation failures not taken care of and if
chip->plat_data.init_setting_num is 0, allocation required.

> diff --git a/sound/soc/codecs/mt6660.h b/sound/soc/codecs/mt6660.h
> new file mode 100644
> index 0000000..6c40b40
> --- /dev/null
> +++ b/sound/soc/codecs/mt6660.h
> +
> +struct mt6660_platform_data {
> +	u8 init_setting_num;
> +	u32 *init_setting_addr;
> +	u32 *init_setting_mask;
> +	u32 *init_setting_val;
> +};

packed could have been better.

> +
> +struct mt6660_chip {
> +	struct i2c_client *i2c;
> +	struct device *dev;
> +	struct platform_device *param_dev;
> +	struct mt6660_platform_data plat_data;
> +	struct mutex io_lock;
> +	struct regmap *regmap;
> +	u16 chip_rev;
> +};
> +

here as well.

Thanks,
Sriram.

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