linux-kernel - Re: [PATCH v2 2/2] iio: proximity: Add driver support for vcnl3020 proximity sensor

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Date:   Wed, 25 Mar 2020 17:53:57 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Ivan Mikhaylov <i.mikhaylov@...ro.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 2/2] iio: proximity: Add driver support for vcnl3020
 proximity sensor

On Wed, Mar 25, 2020 at 5:14 PM Ivan Mikhaylov <i.mikhaylov@...ro.com> wrote:
>
> Proximity sensor driver based on light/vcnl4000.c code.
> For now supports only the single on-demand measurement.
>
> The VCNL3020 is a fully integrated proximity sensor. Fully
> integrated means that the infrared emitter is included in the
> package. It has 16-bit resolution. It includes a signal
> processing IC and features standard I2C communication
> interface. It features an interrupt function.

Thank you for an update, my comments below.

...

> +config VCNL3020
> +       tristate "VCNL3020 proximity sensor"

> +       depends on I2C

REGMAP_I2C

...

> +struct vcnl3020_data {
> +       struct regmap *regmap;

> +       struct i2c_client *client;

Since you have switched to regmap I2C API, do you really need client
here, perhaps struct device *dev would be enough?

> +       u8 rev;
> +       struct mutex lock;
> +};

...

> +       rc = regmap_read(data->regmap, VCNL_PROD_REV, &reg);

> +       if (rc < 0) {

I think you may drop all these ' < 0' checks for regmap, otherwise can
you elaborate what positive return code, if any, means?

> +               dev_err(&data->client->dev,
> +                       "Error (%d) reading product revision", rc);
> +               return rc;
> +       }

...

> +       rc = regmap_write(data->regmap, VCNL_LED_CURRENT, led_current);
> +       if (rc < 0) {

...after above change...

> +               dev_err(&data->client->dev, "Error (%d) setting LED current",
> +                       rc);

> +               return rc;
> +       }
> +
> +       return 0;

...simple return rc; here.

...

> +       /* wait for data to become ready */
> +       do {
> +               rc = regmap_read(data->regmap, VCNL_COMMAND, &reg);
> +               if (rc < 0)
> +                       goto err_unlock;
> +               if (reg & VCNL_PS_RDY)
> +                       break;
> +               msleep(20); /* measurement takes up to 100 ms */
> +       } while (--tries);

regmap_read_poll_timeput()

...

> +static const struct iio_chan_spec vcnl3020_channels[] = {
> +       {
> +               .type = IIO_PROXIMITY,
> +               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),

> +       }

Leave comma here.

> +};

-- 
With Best Regards,
Andy Shevchenko