[alsa-devel] [PATCH 4/5] ASoC: codecs: Add AB8500 codec-driver

[Mark Brown]

On Thu, May 24, 2012 at 03:26:38PM +0200, Ola Lilja wrote:

> +static void show_regulator_status(struct device *dev)
> +{
> +	struct ab8500_codec_drvdata *drvdata = dev_get_drvdata(dev);
> +	struct ab8500_codec_drvdata_dbg *dbg = &drvdata->dbg;
> +
> +	dev_dbg(dev, "%s: Regulator-status:\n", __func__);
> +	dev_dbg(dev, "%s:     V-AUD: %s\n", __func__,
> +		(regulator_is_enabled(dbg->vaud) > 0) ?
> +			"On" : "Off");
> +	dev_dbg(dev, "%s:     V-AMIC1: %s\n", __func__,
> +		(regulator_is_enabled(dbg->vamic1) > 0) ?
> +			"On" : "Off");
> +	dev_dbg(dev, "%s:     V-AMIC2: %s\n", __func__,
> +		(regulator_is_enabled(dbg->vamic2) > 0) ?
> +			"On" : "Off");
> +	dev_dbg(dev, "%s:     V-DMIC: %s\n", __func__,
> +		(regulator_is_enabled(dbg->vdmic) > 0) ?
> +			"On" : "Off");

What problems are you finding when you try to use the debug
infrastructure in both the regulator API and DAPM to discover the state
of the regulators?

> +	/* Clocks */
> +	SND_SOC_DAPM_CLOCK_SUPPLY("audioclk"),
> +	SND_SOC_DAPM_CLOCK_SUPPLY("gpio.1"),

This looks wrong - audioclk looks reasonable but gpio.1 looks like a
board-specific name which shouldn't be encoded into the driver.

> +	if (ucontrol->value.integer.value[0] != SID_APPLY_FIR) {
> +		dev_err(codec->dev,
> +			"%s: ERROR: This control supports '%s' only!\n",
> +			__func__, enum_sid_state[SID_APPLY_FIR]);
> +		return 0;
> +	}

I'd expect this to return an error...

> +	status = snd_soc_dapm_force_enable_pin(&codec->dapm,
> +					"ANC Configure Input");
> +	if (status < 0) {
> +		dev_err(dev,
> +			"%s: ERROR: Failed to enable power (status = %d)!\n",
> +			__func__, status);
> +		goto cleanup;
> +	}
> +	snd_soc_dapm_sync(&codec->dapm);
> +
> +	mutex_lock(&codec->mutex);

Your locking looks bad here.  Nothing ensures that something doesn't
come along and undo the force enable.  Looking at the code this is the
only function that fiddles with the input but there's still a race where
one writer might exit the mutex section and disable the pin while a
second enters the mutex section.

> +static int filter_control_get(struct snd_kcontrol *kcontrol,
> +			struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct filter_control *fc =
> +			(struct filter_control *)kcontrol->private_value;
> +	unsigned int i;
> +
> +	for (i = 0; i < fc->count; i++)
> +		ucontrol->value.integer.value[i] = fc->value[i];
> +
> +	return 0;
> +}
> +
> +static int filter_control_put(struct snd_kcontrol *kcontrol,
> +		struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct filter_control *fc =
> +			(struct filter_control *)kcontrol->private_value;
> +	unsigned int i;
> +
> +	for (i = 0; i < fc->count; i++)
> +		fc->value[i] = ucontrol->value.integer.value[i];

These don't seem to be locked?

> +int ab8500_audio_init_audioblock(struct snd_soc_codec *codec)

static.  Lots of other functions in the rest of the driver have the same
issue.

> +static int ab8500_codec_pcm_hw_params(struct snd_pcm_substream *substream,
> +		struct snd_pcm_hw_params *hw_params, struct snd_soc_dai *dai)
> +{
> +	dev_dbg(dai->codec->dev, "%s Enter.\n", __func__);
> +
> +	return 0;
> +}

Remove empty functions.

> +	default:
> +		dev_err(dai->codec->dev,
> +			"%s: ERROR: Unsupported INV mask 0x%x\n",
> +			__func__, fmt & SND_SOC_DAIFMT_INV_MASK);
> +		return -EINVAL;
> +		break;

The break is redundant.

> +	/* Only 16 bit slot width is supported at the moment in TDM mode */
> +	if (slot_width != 16) {
> +		dev_err(dai->codec->dev,
> +			"%s: ERROR: Unsupported slot_width %d.\n",
> +			__func__, slot_width);
> +		return -EINVAL;
> +	}

You've got code which supports other widths...

> +static struct snd_soc_codec_driver ab8500_codec_driver = {
> +	.probe =		ab8500_codec_probe,
> +	.read =			ab8500_codec_read_reg,
> +	.write =		ab8500_codec_write_reg,
> +	.reg_cache_size =	0,

no need to init things to zero or NULL in static structs.

> +#define PRE_PMU_POST_PMD			(SND_SOC_DAPM_PRE_PMU | \
> +						SND_SOC_DAPM_POST_PMD)

You shouldn't define stuff like this in your driver!
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