On Tue, Nov 08, 2016 at 05:20:57PM +0100, Peter Rosin wrote:
> +++ b/sound/soc/axentia/Kconfig
> @@ -0,0 +1,10 @@
> +config SND_SOC_AXENTIA_TSE850_PCM5142
> + tristate "ASoC driver for the Axentia TSE-850"
> + depends on ARCH_AT91 && OF
> + select ATMEL_SSC
> + select SND_ATMEL_SOC
> + select SND_ATMEL_SOC_SSC_DMA
> + select SND_SOC_PCM512x_I2C
> + help
> + Say Y if you want to add support for the ASoC driver for the
> + Axentia TSE-850 with a PCM5142 codec.
This just looks like a normal machine driver for an Atmel system which
would usually go in the atemel directory - why is a new directory being
created?
> +static int tse850_get_mux2(struct snd_kcontrol *kctrl,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
> + struct snd_soc_card *card = dapm->card;
> + struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
> + int ret;
> +
> + ret = gpiod_get_value(tse850->loop2);
> + if (ret < 0)
> + return ret;
We can't reliably read the value of output GPIOs (though in practice the
majority do support it) so it'd be better practice to use a state
variable to remember what we set. I'd also expect this to use the
_cansleep() GPIO calls as it's not in a context where sleeping would be
a problem.
> +int tse850_get_ana(struct snd_kcontrol *kctrl,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
> + struct snd_soc_card *card = dapm->card;
> + struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
> + int ret;
> +
> + ret = regulator_get_voltage(tse850->ana);
> + if (ret < 0)
> + return ret;
> +
> + if (ret < 11000000)
> + ret = 11000000;
> + else if (ret > 20000000)
> + ret = 20000000;
This needs some comments...
> + struct snd_soc_pcm_runtime *rtd = substream->private_data;
> + struct device *dev = rtd->dev;
> + struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
> + int dir = substream->stream != SNDRV_PCM_STREAM_PLAYBACK;
> + int div_id = dir ? ATMEL_SSC_RCMR_PERIOD : ATMEL_SSC_TCMR_PERIOD;
> + int period = snd_soc_params_to_frame_size(params) / 2 - 1;
Please write the logic out as normal if statements for legibility. It's
a bit concerning that we even need this function, it looks like pretty
basic stuff that I'd expect the CPU DAI to just be doing - why can't
this be the default behaviour of the CPU DAI?
> +static int tse850_init(struct snd_soc_pcm_runtime *rtd)
> +{
> + struct snd_soc_dapm_context *dapm = &rtd->card->dapm;
> +
> + return snd_soc_dapm_add_routes(dapm, tse850_intercon,
> + ARRAY_SIZE(tse850_intercon));
Set this up in the card data structure rather than open coding the call,
you can register DAPM routes there too.
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