linux-kernel - Re: [PATCH 1/1] iio: humidity: hdc100x: add manufacturer and device id cehck

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Date:   Mon, 25 Jul 2022 23:01:56 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Potin Lai <potin.lai.pt@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Patrick Williams <patrick@...cx.xyz>,
        Potin Lai <potin.lai@...ntatw.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] iio: humidity: hdc100x: add manufacturer and device
 id cehck

On Fri, Jul 22, 2022 at 7:25 PM Potin Lai <potin.lai.pt@...il.com> wrote:
>
> Add manufacturer and device id checking during probe, and Skip the

ID
skip

> checking if chip model not supported.
>
> Supported:
> - HDC1000
> - HDC1010
> - HDC1050
> - HDC1080
>
> Not supported:
> - HDC1008

...

> +enum {
> +       HDC100X,
> +       HDC1000,
> +       HDC1008,
> +       HDC1010,
> +       HDC1050,
> +       HDC1080

+ Comma here.

> +};

...

> +static const struct of_device_id hdc100x_dt_ids[];

No, drop it.

...

> +       match = i2c_of_match_device(hdc100x_dt_ids, client);
> +
> +       if (match) {
> +               of_data = (struct hdc100x_of_data *)match->data;
> +               if (!of_data->support_mfr_check)
> +                       return true;

Besides the redundant blank line this call to i2c_of_match_device() is not good.

of_data is a misleading name. What about ACPI?

What you are looking for is:

  data = device_get_match_data(&client->dev);

> +       } else if (id->driver_data == HDC1008)

Don't use I2C id field, switch to i2c ->probe_new() if it's not done yet.

> +               return true;
> +
> +       mfr_id = hdc100x_read_mfr_id(client);
> +       dev_id = hdc100x_read_dev_id(client);
> +       if (mfr_id == HDC100X_MFR_ID &&
> +          (dev_id == 0x1000 || dev_id == 0x1050))
> +               return true;
> +
> +       return false;
> +}

...

>  static const struct i2c_device_id hdc100x_id[] = {
> -       { "hdc100x", 0 },
> -       { "hdc1000", 0 },
> -       { "hdc1008", 0 },
> -       { "hdc1010", 0 },
> -       { "hdc1050", 0 },
> -       { "hdc1080", 0 },
> +       { "hdc100X", HDC100X },
> +       { "hdc1000", HDC1000 },
> +       { "hdc1008", HDC1008 },
> +       { "hdc1010", HDC1010 },
> +       { "hdc1050", HDC1050 },
> +       { "hdc1080", HDC1080 },

Please, use pointers as in of_device_id table.

>         { }
>  };

-- 
With Best Regards,
Andy Shevchenko