linux-kernel - Re: [PATCH v2] iio: amplifiers: ad8366: add support for HMC1119 Attenuator

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Message-ID: <20200221162929.41870ce9@archlinux>
Date:   Fri, 21 Feb 2020 16:29:29 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>
Subject: Re: [PATCH v2] iio: amplifiers: ad8366: add support for HMC1119
 Attenuator

On Fri, 21 Feb 2020 18:18:26 +0200
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> From: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
> 
> This change adds support for the HMC1119 Silicon Digial Attenuator. The
> HMC1119 is a broadband, highly accurate, 7-bit digital attenuator,
> operating from 0.1 GHz to 6.0 GHz with 31.5 dB attenuation control range
> in 0.25 dB steps.
> 
> Link: https://www.analog.com/media/en/technical-documentation/data-sheets/hmc1119.pdf
> 
> Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@...log.com>

Applied, thanks.

Jonathan

> ---
>  drivers/iio/amplifiers/ad8366.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
> index 95972ab60f42..62167b87caea 100644
> --- a/drivers/iio/amplifiers/ad8366.c
> +++ b/drivers/iio/amplifiers/ad8366.c
> @@ -5,6 +5,7 @@
>   *   AD8366 Dual-Digital Variable Gain Amplifier (VGA)
>   *   ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
>   *   ADL5240 Digitally controlled variable gain amplifier (VGA)
> + *   HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
>   *
>   * Copyright 2012-2019 Analog Devices Inc.
>   */
> @@ -27,6 +28,7 @@ enum ad8366_type {
>  	ID_AD8366,
>  	ID_ADA4961,
>  	ID_ADL5240,
> +	ID_HMC1119,
>  };
>  
>  struct ad8366_info {
> @@ -62,6 +64,10 @@ static struct ad8366_info ad8366_infos[] = {
>  		.gain_min = -11500,
>  		.gain_max = 20000,
>  	},
> +	[ID_HMC1119] = {
> +		.gain_min = -31750,
> +		.gain_max = 0,
> +	},
>  };
>  
>  static int ad8366_write(struct iio_dev *indio_dev,
> @@ -84,6 +90,9 @@ static int ad8366_write(struct iio_dev *indio_dev,
>  	case ID_ADL5240:
>  		st->data[0] = (ch_a & 0x3F);
>  		break;
> +	case ID_HMC1119:
> +		st->data[0] = ch_a;
> +		break;
>  	}
>  
>  	ret = spi_write(st->spi, st->data, indio_dev->num_channels);
> @@ -118,6 +127,9 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
>  		case ID_ADL5240:
>  			gain = 20000 - 31500 + code * 500;
>  			break;
> +		case ID_HMC1119:
> +			gain = -1 * code * 250;
> +			break;
>  		}
>  
>  		/* Values in dB */
> @@ -164,6 +176,9 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
>  	case ID_ADL5240:
>  		code = ((gain - 500 - 20000) / 500) & 0x3F;
>  		break;
> +	case ID_HMC1119:
> +		code = (abs(gain) / 250) & 0x7F;
> +		break;
>  	}
>  
>  	mutex_lock(&st->lock);
> @@ -246,6 +261,7 @@ static int ad8366_probe(struct spi_device *spi)
>  		break;
>  	case ID_ADA4961:
>  	case ID_ADL5240:
> +	case ID_HMC1119:
>  		st->reset_gpio = devm_gpiod_get(&spi->dev, "reset",
>  			GPIOD_OUT_HIGH);
>  		indio_dev->channels = ada4961_channels;
> @@ -298,6 +314,7 @@ static const struct spi_device_id ad8366_id[] = {
>  	{"ad8366",  ID_AD8366},
>  	{"ada4961", ID_ADA4961},
>  	{"adl5240", ID_ADL5240},
> +	{"hmc1119", ID_HMC1119},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(spi, ad8366_id);