Re: [PATCH v7 5/5] iio: light: Add support for APDS9306 Light Sensor

Jonathan Cameron
2024-02-26T19:10:36Z

On Mon, 26 Feb 2024 16:12:23 +0200
Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote:

> On Sun, Feb 18, 2024 at 04:18:26PM +1030, Subhajit Ghosh wrote:
> > Driver support for Avago (Broadcom) APDS9306 Ambient Light Sensor.
> > It has two channels - ALS and CLEAR. The ALS (Ambient Light Sensor)
> > channel approximates the response of the human-eye providing direct
> > read out where the output count is proportional to ambient light levels.
> > It is internally temperature compensated and rejects 50Hz and 60Hz flicker
> > caused by artificial light sources. Hardware interrupt configuration is
> > optional. It is a low power device with 20 bit resolution and has
> > configurable adaptive interrupt mode and interrupt persistence mode.
> > The device also features inbuilt hardware gain, multiple integration time
> > selection options and sampling frequency selection options.
> >
> > This driver also uses the IIO GTS (Gain Time Scale) Helpers Namespace for
> > Scales, Gains and Integration time implementation.
>
> ...
>
> > +/*
> > + * Available scales with gain 1x - 18x, timings 3.125, 25, 50, 100, 200, 400 mS
>
> "mS" --> "ms."
>
> > + * Time impacts to gain: 1x, 8x, 16x, 32x, 64x, 128x
> > + */
>
> ...
>
> > + /*
> > + * If this function runs parallel with the interrupt handler, either
> > + * this reads and clears the status registers or the interrupt handler
> > + * does. The interrupt handler sets a flag for read data available
> > + * in our private structure which we read here.
> > + */
> > + ret = regmap_read_poll_timeout(data->regmap, APDS9306_MAIN_STATUS_REG,
> > + status, data->read_data_available ||
> > + (status & (APDS9306_ALS_DATA_STAT_MASK |
> > + APDS9306_ALS_INT_STAT_MASK)),
> > + APDS9306_ALS_READ_DATA_DELAY_US, delay * 2);
>
> > +
>
> Redundant blank line
>
> > + if (ret)
> > + return ret;
>
> ...
>
> > +static int apds9306_init_iio_gts(struct apds9306_data *data)
> > +{
> > + int i, ret, part_id;
> > +
> > + ret = regmap_read(data->regmap, APDS9306_PART_ID_REG, &part_id);
> > + if (ret)
> > + return ret;
> > +
> > + for (i = 0; i < ARRAY_SIZE(apds9306_gts_mul); i++)
> > + if (part_id == apds9306_gts_mul[i].part_id)
> > + break;
> > +
> > + if (i == ARRAY_SIZE(apds9306_gts_mul))
> > + return -ENXIO;
>
> Strange choice of the error code, why not (one of) -ENOENT / -ENODATA ?
>
> > + return devm_iio_init_iio_gts(data->dev,
> > + apds9306_gts_mul[i].max_scale_int,
> > + apds9306_gts_mul[i].max_scale_nano,
> > + apds9306_gains, ARRAY_SIZE(apds9306_gains),
> > + apds9306_itimes, ARRAY_SIZE(apds9306_itimes),
> > + &data->gts);
>
> > +
> > + return -ENXIO;
>
> Dead code.
>
> > +}
>
> ...
>
> Jonathan, are you going to apply this and addressing comments at the same time?
> Or should it be another version?
>

The multibit field pretending to be a boolean was too complex for to want to modify
whilst applying. So yes, v8 with that tidied up and your comments sorted out

Jonathan