linux-kernel - Re: [PATCH] iio: light: vcnl4000: Fix scale for vcnl4040

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Date:   Fri, 27 Dec 2019 09:47:20 +0100
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Guido Günther <agx@...xcpu.org>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        "Angus Ainslie (Purism)" <angus@...ea.ca>,
        Allison Randal <allison@...utok.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: light: vcnl4000: Fix scale for vcnl4040

Hi Guido,

On 19-12-23 16:30, Guido Günther wrote:
> According to the data sheet the ambient sensors's scale is 0.12
> lux/step, not 0.024 lux/step as used by vcnl4200.

This is only true if the als_it bits are set to '0'. Is it worth to add
a comment here?

> See p. 8 in https://www.vishay.com/docs/84307/designingvcnl4040.pdf
> 
> Fixes: 5a441aade5b3 ("light: vcnl4000 add support for the VCNL4040 proximity and light sensor")
> Signed-off-by: Guido Günther <agx@...xcpu.org>

Reviewed-by: Marco Felsch <m.felsch@...gutronix.de>

> ---
>  drivers/iio/light/vcnl4000.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
> index 16dacea9eadf..b0e241aaefb4 100644
> --- a/drivers/iio/light/vcnl4000.c
> +++ b/drivers/iio/light/vcnl4000.c
> @@ -163,7 +163,6 @@ static int vcnl4200_init(struct vcnl4000_data *data)
>  	if (ret < 0)
>  		return ret;
>  
> -	data->al_scale = 24000;
>  	data->vcnl4200_al.reg = VCNL4200_AL_DATA;
>  	data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
>  	switch (id) {
> @@ -172,11 +171,13 @@ static int vcnl4200_init(struct vcnl4000_data *data)
>  		/* show 54ms in total. */
>  		data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000);
>  		data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000);
> +		data->al_scale = 24000;
>  		break;
>  	case VCNL4040_PROD_ID:
>  		/* Integration time is 80ms, add 10ms. */
>  		data->vcnl4200_al.sampling_rate = ktime_set(0, 100000 * 1000);
>  		data->vcnl4200_ps.sampling_rate = ktime_set(0, 100000 * 1000);
> +		data->al_scale = 120000;
>  		break;
>  	}
>  	data->vcnl4200_al.last_measurement = ktime_set(0, 0);
> -- 
> 2.23.0