linux-kernel - Re: [PATCH V1 5/6] iio: accel: sca3300: Add inclination channels.

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Date:   Mon, 24 Jan 2022 15:19:09 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Tomas Melin <tomas.melin@...sala.com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V1 5/6] iio: accel: sca3300: Add inclination channels.

On Mon, Jan 24, 2022 at 11:39 AM LI Qingwu
<Qing-wu.Li@...ca-geosystems.com.cn> wrote:
>
> Different with SCA3300, SCL3300 can output inclination angles.
> Angles are formed from acceleration with following equations:
> ANG_X = atan2(accx / √(accy^2 + accz^2)),
> ANG_Y = atan2(accy / √(accx^2 + accz^2)),
> ANG_Z = atan2(accz / √(accx^2 + accy^2)),
>
> The commit add output of the raw value,scale
> and scale_available of angles.
> add interface for enable/disable of the angle output.
>
> new interfaces:

New

> in_incli_en
> in_incli_scale
> in_incli_scale_available
> in_incli_x_raw
> in_incli_y_raw
> in_incli_z_raw

Indent them by 2 spaces.

Wondering if these need to be described in ABI documentation.

...

>         SCA3300_ACCEL_CHANNEL(SCA3300_ACC_Y, 0x2, Y),
>         SCA3300_ACCEL_CHANNEL(SCA3300_ACC_Z, 0x3, Z),
>         SCA3300_TEMP_CHANNEL(SCA3300_TEMP, 0x05),
> -       IIO_CHAN_SOFT_TIMESTAMP(4)

> +       IIO_CHAN_SOFT_TIMESTAMP(SCA3300_TIMESTAMP)

+ Comma (while at it)?

...

> -       IIO_CHAN_SOFT_TIMESTAMP(4),
> +       SCA3300_INCLI_CHANNEL(SCA3300_INCLI_X, 0x09, X),
> +       SCA3300_INCLI_CHANNEL(SCA3300_INCLI_Y, 0x0A, Y),
> +       SCA3300_INCLI_CHANNEL(SCA3300_INCLI_Z, 0x0B, Z),
> +       IIO_CHAN_SOFT_TIMESTAMP(SCA3300_TIMESTAMP)

Ditto.

> +static const int sca3300_incli_scale[CHIP_CNT][OP_MOD_CNT][2] = {
> +       [CHIP_SCA3300] = {{0, 0}, {0, 0}, {0, 0}, {0, 0}},

> +       [CHIP_SCL3300] = {{0, 5495}, {0, 5495}, {0, 5495}, {0, 5495}}

+ Comma.

> +};

...

>         struct {
> -               s16 channels[4];
> +               s16 channels[SCA3300_TIMESTAMP-1];

Missed spaces around the arithmetic operator.

>                 s64 ts __aligned(sizeof(s64));
>         } scan;
>         const struct sca3300_chip_info *chip_info;
>         u8 txbuf[4] ____cacheline_aligned;
>         u8 rxbuf[4];

> -

Stray change.

>  };

...

> +               /*Inclination scale info tied to accel scale.*/
> +               /*not allowed to set separately.      */

Please, follow the proper style for multi-line comments, including
necessary spaces, periods, starting and ending lines.

...

> +       case IIO_CHAN_INFO_ENABLE:
> +               if (data->chip_info->chip_type == CHIP_SCL3300) {

> +                       if (chan->type == IIO_INCLI) {

See below.

> +                               if (val != 0)

   if (val)

> +                                       reg_val = 0x1F;
> +                               else
> +                                       reg_val = 0x00;
> +                               return sca3300_write_reg(data, SCA3300_REG_ANG_CTRL, reg_val);
> +                       }
> +               }

...

> -               if (chan->type == IIO_ACCEL) {
> +
> +               if (chan->type == IIO_INCLI) {

> +               } else if (chan->type == IIO_ACCEL) {

I would recommend using switch-case for channel type as well.

...

> +       case IIO_CHAN_INFO_ENABLE:
> +               if (chan->type == IIO_INCLI) {

> +                       ret = sca3300_read_reg(data, SCA3300_REG_ANG_CTRL, &reg_val);

How is ret supposed to be used?

> +                       *val = reg_val;
> +                       return IIO_VAL_INT;
> +               }
> +               return -EINVAL;

-- 
With Best Regards,
Andy Shevchenko