linux-kernel - Re: [PATCH v5 04/11] staging: iio: ad7780: add filter reading to ad778x

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Date:   Sat, 16 Mar 2019 17:55:48 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Renato Lui Geh <renatogeh@...il.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        stefan.popa@...log.com, alexandru.Ardelean@...log.com,
        giuliano.belinassi@....br, robh+dt@...nel.org,
        mark.rutland@....com, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-usp@...glegroups.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 04/11] staging: iio: ad7780: add filter reading to
 ad778x

On Fri, 15 Mar 2019 23:13:42 -0300
Renato Lui Geh <renatogeh@...il.com> wrote:

> This patch adds the new feature of reading the filter odr value for
> ad778x chips. This value is stored in the chip's state struct whenever a
> read or write call is performed on the chip's driver.
> 
> This feature requires sharing SAMP_FREQ. Since the ad717x does not have
> a filter option, the driver only shares the relevant info mask for the
> ad778x family.
> 
> Signed-off-by: Renato Lui Geh <renatogeh@...il.com>
Applied,

Thanks,

Jonathan

> ---
> Changes in v4:
>  - As mentioned in the previous patch, this was originally as part of
>    the 'add gain & filter gpio support' patch
> Changes in v5:
>  - Moved ad778x_odr_avail declaration from GPIO patch to this one
> 
>  drivers/staging/iio/adc/ad7780.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
> index fbcc0d3345ca..8ff74427d975 100644
> --- a/drivers/staging/iio/adc/ad7780.c
> +++ b/drivers/staging/iio/adc/ad7780.c
> @@ -42,7 +42,8 @@
>  #define AD7780_GAIN_MIDPOINT	64
>  #define AD7780_FILTER_MIDPOINT	13350
>  
> -static const unsigned int ad778x_gain[2] = { 1, 128 };
> +static const unsigned int ad778x_gain[2]      = { 1, 128 };
> +static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 };
>  
>  struct ad7780_chip_info {
>  	struct iio_chan_spec	channel;
> @@ -58,6 +59,7 @@ struct ad7780_state {
>  	struct gpio_desc		*gain_gpio;
>  	struct gpio_desc		*filter_gpio;
>  	unsigned int			gain;
> +	unsigned int			odr;
>  	unsigned int			int_vref_mv;
>  
>  	struct ad_sigma_delta sd;
> @@ -120,6 +122,9 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
>  	case IIO_CHAN_INFO_OFFSET:
>  		*val = -(1 << (chan->scan_type.realbits - 1));
>  		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_SAMP_FREQ:
> +		*val = st->odr;
> +		return IIO_VAL_INT;
>  	default:
>  		break;
>  	}
> @@ -162,6 +167,7 @@ static int ad7780_write_raw(struct iio_dev *indio_dev,
>  			val = 0;
>  		else
>  			val = 1;
> +		st->odr = ad778x_odr_avail[val];
>  		gpiod_set_value(st->filter_gpio, val);
>  		break;
>  	default:
> @@ -181,8 +187,10 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
>  	    ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
>  		return -EIO;
>  
> -	if (chip_info->is_ad778x)
> +	if (chip_info->is_ad778x) {
>  		st->gain = ad778x_gain[raw_sample & AD7780_GAIN];
> +		st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER];
> +	}
>  
>  	return 0;
>  }
> @@ -194,17 +202,19 @@ static const struct ad_sigma_delta_info ad7780_sigma_delta_info = {
>  };
>  
>  #define AD7780_CHANNEL(bits, wordsize) \
> +	AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits)
> +#define AD7170_CHANNEL(bits, wordsize) \
>  	AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits)
>  
>  static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
>  	[ID_AD7170] = {
> -		.channel = AD7780_CHANNEL(12, 24),
> +		.channel = AD7170_CHANNEL(12, 24),
>  		.pattern = AD7170_PATTERN,
>  		.pattern_mask = AD7170_PATTERN_MASK,
>  		.is_ad778x = false,
>  	},
>  	[ID_AD7171] = {
> -		.channel = AD7780_CHANNEL(16, 24),
> +		.channel = AD7170_CHANNEL(16, 24),
>  		.pattern = AD7170_PATTERN,
>  		.pattern_mask = AD7170_PATTERN_MASK,
>  		.is_ad778x = false,