Re: [PATCH v7 2/3] iio: chemical: atlas-sensor: add DO-SM module support

[Jonathan Cameron <jic23@kernel.org>]

On Mon, 17 Feb 2020 19:42:38 -0800
Matt Ranostay <matt.ranostay@konsulko.com> wrote:

> Atlas Scientific DO-SM OEM sensor reads disolved oxygen in
> a solution. This is reported back as mg/L which maps directly
> to ppm and so the IIO_CONCENTRATION channel type can be used.
> 
> Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/chemical/atlas-sensor.c | 64 +++++++++++++++++++++++++++--
>  1 file changed, 60 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/chemical/atlas-sensor.c b/drivers/iio/chemical/atlas-sensor.c
> index d95818b74770..82d470561ad3 100644
> --- a/drivers/iio/chemical/atlas-sensor.c
> +++ b/drivers/iio/chemical/atlas-sensor.c
> @@ -48,6 +48,11 @@
>  #define ATLAS_REG_EC_CALIB_STATUS_LOW		BIT(2)
>  #define ATLAS_REG_EC_CALIB_STATUS_HIGH		BIT(3)
>  
> +#define ATLAS_REG_DO_CALIB_STATUS		0x09
> +#define ATLAS_REG_DO_CALIB_STATUS_MASK		0x03
> +#define ATLAS_REG_DO_CALIB_STATUS_PRESSURE	BIT(0)
> +#define ATLAS_REG_DO_CALIB_STATUS_DO		BIT(1)
> +
>  #define ATLAS_REG_PH_TEMP_DATA		0x0e
>  #define ATLAS_REG_PH_DATA		0x16
>  
> @@ -60,14 +65,19 @@
>  #define ATLAS_REG_ORP_CALIB_STATUS	0x0d
>  #define ATLAS_REG_ORP_DATA		0x0e
>  
> +#define ATLAS_REG_DO_TEMP_DATA		0x12
> +#define ATLAS_REG_DO_DATA		0x22
> +
>  #define ATLAS_PH_INT_TIME_IN_MS		450
>  #define ATLAS_EC_INT_TIME_IN_MS		650
>  #define ATLAS_ORP_INT_TIME_IN_MS	450
> +#define ATLAS_DO_INT_TIME_IN_MS		450
>  
>  enum {
>  	ATLAS_PH_SM,
>  	ATLAS_EC_SM,
>  	ATLAS_ORP_SM,
> +	ATLAS_DO_SM,
>  };
>  
>  struct atlas_data {
> @@ -122,7 +132,7 @@ static const struct iio_chan_spec atlas_ph_channels[] = {
>  	},
>  };
>  
> -#define ATLAS_EC_CHANNEL(_idx, _addr) \
> +#define ATLAS_CONCENTRATION_CHANNEL(_idx, _addr) \
>  	{\
>  		.type = IIO_CONCENTRATION, \
>  		.indexed = 1, \
> @@ -153,8 +163,8 @@ static const struct iio_chan_spec atlas_ec_channels[] = {
>  			.endianness = IIO_BE,
>  		},
>  	},
> -	ATLAS_EC_CHANNEL(0, ATLAS_REG_TDS_DATA),
> -	ATLAS_EC_CHANNEL(1, ATLAS_REG_PSS_DATA),
> +	ATLAS_CONCENTRATION_CHANNEL(0, ATLAS_REG_TDS_DATA),
> +	ATLAS_CONCENTRATION_CHANNEL(1, ATLAS_REG_PSS_DATA),
>  	IIO_CHAN_SOFT_TIMESTAMP(3),
>  	{
>  		.type = IIO_TEMP,
> @@ -183,6 +193,19 @@ static const struct iio_chan_spec atlas_orp_channels[] = {
>  	IIO_CHAN_SOFT_TIMESTAMP(1),
>  };
>  
> +static const struct iio_chan_spec atlas_do_channels[] = {
> +	ATLAS_CONCENTRATION_CHANNEL(0, ATLAS_REG_DO_DATA),
> +	IIO_CHAN_SOFT_TIMESTAMP(1),
> +	{
> +		.type = IIO_TEMP,
> +		.address = ATLAS_REG_DO_TEMP_DATA,
> +		.info_mask_separate =
> +			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> +		.output = 1,
> +		.scan_index = -1
> +	},
> +};
> +
>  static int atlas_check_ph_calibration(struct atlas_data *data)
>  {
>  	struct device *dev = &data->client->dev;
> @@ -263,7 +286,31 @@ static int atlas_check_orp_calibration(struct atlas_data *data)
>  		dev_warn(dev, "device has not been calibrated\n");
>  
>  	return 0;
> -};
> +}
> +
> +static int atlas_check_do_calibration(struct atlas_data *data)
> +{
> +	struct device *dev = &data->client->dev;
> +	int ret;
> +	unsigned int val;
> +
> +	ret = regmap_read(data->regmap, ATLAS_REG_DO_CALIB_STATUS, &val);
> +	if (ret)
> +		return ret;
> +
> +	if (!(val & ATLAS_REG_DO_CALIB_STATUS_MASK)) {
> +		dev_warn(dev, "device has not been calibrated\n");
> +		return 0;
> +	}
> +
> +	if (!(val & ATLAS_REG_DO_CALIB_STATUS_PRESSURE))
> +		dev_warn(dev, "device missing atmospheric pressure calibration\n");
> +
> +	if (!(val & ATLAS_REG_DO_CALIB_STATUS_DO))
> +		dev_warn(dev, "device missing dissolved oxygen calibration\n");
> +
> +	return 0;
> +}
>  
>  struct atlas_device {
>  	const struct iio_chan_spec *channels;
> @@ -296,6 +343,13 @@ static struct atlas_device atlas_devices[] = {
>  				.calibration = &atlas_check_orp_calibration,
>  				.delay = ATLAS_ORP_INT_TIME_IN_MS,
>  	},
> +	[ATLAS_DO_SM] = {
> +				.channels = atlas_do_channels,
> +				.num_channels = 3,
> +				.data_reg = ATLAS_REG_DO_DATA,
> +				.calibration = &atlas_check_do_calibration,
> +				.delay = ATLAS_DO_INT_TIME_IN_MS,
> +	},
>  };
>  
>  static int atlas_set_powermode(struct atlas_data *data, int on)
> @@ -511,6 +565,7 @@ static const struct i2c_device_id atlas_id[] = {
>  	{ "atlas-ph-sm", ATLAS_PH_SM},
>  	{ "atlas-ec-sm", ATLAS_EC_SM},
>  	{ "atlas-orp-sm", ATLAS_ORP_SM},
> +	{ "atlas-do-sm", ATLAS_DO_SM},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(i2c, atlas_id);
> @@ -519,6 +574,7 @@ static const struct of_device_id atlas_dt_ids[] = {
>  	{ .compatible = "atlas,ph-sm", .data = (void *)ATLAS_PH_SM, },
>  	{ .compatible = "atlas,ec-sm", .data = (void *)ATLAS_EC_SM, },
>  	{ .compatible = "atlas,orp-sm", .data = (void *)ATLAS_ORP_SM, },
> +	{ .compatible = "atlas,do-sm", .data = (void *)ATLAS_DO_SM, },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, atlas_dt_ids);