Re: [PATCH v3 02/28] staging: iio: tsl2583: fix issue with changes to calibscale and int_time not being set on the chip

[Jonathan Cameron <jic23@kernel.org>]

On 10/11/16 09:25, Brian Masney wrote:
> When updating the in_illuminance_calibscale and
> in_illuminance_integration_time sysfs attributes, these values were not
> actually written to the chip. The chip would continue to use the old
> parameters. Extracted out tsl2583_set_als_gain() and
> tsl2583_set_als_time() functions that are now called when these sysfs
> attributes are updated. The chip initialization also calls these these
> new functions.
> 
> Signed-off-by: Brian Masney <masneyb@onstation.org>
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan
> ---
>  drivers/staging/iio/light/tsl2583.c | 85 +++++++++++++++++++++++--------------
>  1 file changed, 52 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
> index c196a42..1a7be12 100644
> --- a/drivers/staging/iio/light/tsl2583.c
> +++ b/drivers/staging/iio/light/tsl2583.c
> @@ -352,6 +352,51 @@ static int taos_als_calibrate(struct iio_dev *indio_dev)
>  	return (int)gain_trim_val;
>  }
>  
> +static int tsl2583_set_als_time(struct tsl2583_chip *chip)
> +{
> +	int als_count, als_time, ret;
> +	u8 val;
> +
> +	/* determine als integration register */
> +	als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
> +	if (!als_count)
> +		als_count = 1; /* ensure at least one cycle */
> +
> +	/* convert back to time (encompasses overrides) */
> +	als_time = (als_count * 27 + 5) / 10;
> +
> +	val = 256 - als_count;
> +	ret = i2c_smbus_write_byte_data(chip->client,
> +					TSL258X_CMD_REG | TSL258X_ALS_TIME,
> +					val);
> +	if (ret < 0) {
> +		dev_err(&chip->client->dev, "%s failed to set the als time to %d\n",
> +			__func__, val);
> +		return ret;
> +	}
> +
> +	/* set chip struct re scaling and saturation */
> +	chip->als_saturation = als_count * 922; /* 90% of full scale */
> +	chip->als_time_scale = (als_time + 25) / 50;
> +
> +	return ret;
> +}
> +
> +static int tsl2583_set_als_gain(struct tsl2583_chip *chip)
> +{
> +	int ret;
> +
> +	/* Set the gain based on taos_settings struct */
> +	ret = i2c_smbus_write_byte_data(chip->client,
> +					TSL258X_CMD_REG | TSL258X_GAIN,
> +					chip->taos_settings.als_gain);
> +	if (ret < 0)
> +		dev_err(&chip->client->dev, "%s failed to set the gain to %d\n",
> +			__func__, chip->taos_settings.als_gain);
> +
> +	return ret;
> +}
> +
>  static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
>  {
>  	int ret;
> @@ -371,10 +416,8 @@ static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
>   */
>  static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
>  {
> -	int ret, val;
> -	int als_count;
> -	int als_time;
>  	struct tsl2583_chip *chip = iio_priv(indio_dev);
> +	int ret;
>  
>  	/* and make sure we're not already on */
>  	if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
> @@ -397,37 +440,13 @@ static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
>  		return ret;
>  	}
>  
> -	/* determine als integration register */
> -	als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
> -	if (!als_count)
> -		als_count = 1; /* ensure at least one cycle */
> -
> -	/* convert back to time (encompasses overrides) */
> -	als_time = (als_count * 27 + 5) / 10;
> -
> -	val = 256 - als_count;
> -	ret = i2c_smbus_write_byte_data(chip->client,
> -					TSL258X_CMD_REG | TSL258X_ALS_TIME,
> -					val);
> -	if (ret < 0) {
> -		dev_err(&chip->client->dev, "%s failed to set the als time to %d\n",
> -			__func__, val);
> +	ret = tsl2583_set_als_time(chip);
> +	if (ret < 0)
>  		return ret;
> -	}
>  
> -	/* Set the gain based on taos_settings struct */
> -	ret = i2c_smbus_write_byte_data(chip->client,
> -					TSL258X_CMD_REG | TSL258X_GAIN,
> -					chip->taos_settings.als_gain);
> -	if (ret < 0) {
> -		dev_err(&chip->client->dev, "%s failed to set the gain to %d\n",
> -			__func__, chip->taos_settings.als_gain);
> +	ret = tsl2583_set_als_gain(chip);
> +	if (ret < 0)
>  		return ret;
> -	}
> -
> -	/* set chip struct re scaling and saturation */
> -	chip->als_saturation = als_count * 922; /* 90% of full scale */
> -	chip->als_time_scale = (als_time + 25) / 50;
>  
>  	usleep_range(3000, 3500);
>  
> @@ -707,7 +726,7 @@ static int tsl2583_write_raw(struct iio_dev *indio_dev,
>  			for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
>  				if (gainadj[i].mean == val) {
>  					chip->taos_settings.als_gain = i;
> -					ret = 0;
> +					ret = tsl2583_set_als_gain(chip);
>  					break;
>  				}
>  			}
> @@ -717,7 +736,7 @@ static int tsl2583_write_raw(struct iio_dev *indio_dev,
>  		if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
>  		    val2 <= 650 && !(val2 % 50)) {
>  			chip->taos_settings.als_time = val2;
> -			ret = 0;
> +			ret = tsl2583_set_als_time(chip);
>  		}
>  		break;
>  	default:
>