Re: [PATCH 5/6] staging: iio: tsl2x7x: refactor {read,write}_event_value to allow handling multiple iio_event_infos

[Jonathan Cameron]

On Thu, 29 Jun 2017 13:03:51 -0400
Brian Masney <masneyb@xxxxxxxxxxxxx> wrote:

> tsl2x7x_read_thresh() and tsl2x7x_write_thresh() currently assumes
> that IIO_EV_INFO_VALUE is the only iio_event_info that will be
> passed in.  This patch refactors these two functions so that
> additional iio_event_infos can be passed in. The functions are
> renamed from tsl2x7x_{read,write}_thresh() to
> tsl2x7x_{read,write}_event_value(). This patch also adds the
> missing return value check to tsl2x7x_invoke_change() since this
> was previously missing.
> 
Hmm.. Why make this change?  Are there additional uses of this
function on the way?

If not I wouldn't necessarily worry about the naming or the
assumptions as the assumptions are enforced by the driver
anyway.  Nothing wrong with a bit of paranoid defence against
future  bugs, but it's not strictly necessary.

J
> Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx>
> ---
>  drivers/staging/iio/light/tsl2x7x.c | 157 +++++++++++++++++++++---------------
>  1 file changed, 90 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index 620f40c..6a5d58c 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -1219,78 +1219,101 @@ static int tsl2x7x_write_interrupt_config(struct iio_dev *indio_dev,
>  	return 0;
>  }
>  
> -static int tsl2x7x_write_thresh(struct iio_dev *indio_dev,
> -				const struct iio_chan_spec *chan,
> -				enum iio_event_type type,
> -				enum iio_event_direction dir,
> -				enum iio_event_info info,
> -				int val, int val2)
> +static int tsl2x7x_write_event_value(struct iio_dev *indio_dev,
> +				     const struct iio_chan_spec *chan,
> +				     enum iio_event_type type,
> +				     enum iio_event_direction dir,
> +				     enum iio_event_info info,
> +				     int val, int val2)
>  {
>  	struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> +	int ret = -EINVAL;
>  
> -	if (chan->type == IIO_INTENSITY) {
> -		switch (dir) {
> -		case IIO_EV_DIR_RISING:
> -			chip->tsl2x7x_settings.als_thresh_high = val;
> -			break;
> -		case IIO_EV_DIR_FALLING:
> -			chip->tsl2x7x_settings.als_thresh_low = val;
> -			break;
> -		default:
> -			return -EINVAL;
> -		}
> -	} else {
> -		switch (dir) {
> -		case IIO_EV_DIR_RISING:
> -			chip->tsl2x7x_settings.prox_thres_high = val;
> -			break;
> -		case IIO_EV_DIR_FALLING:
> -			chip->tsl2x7x_settings.prox_thres_low = val;
> -			break;
> -		default:
> -			return -EINVAL;
> +	switch (info) {
> +	case IIO_EV_INFO_VALUE:
> +		if (chan->type == IIO_INTENSITY) {
> +			switch (dir) {
> +			case IIO_EV_DIR_RISING:
> +				chip->tsl2x7x_settings.als_thresh_high = val;
> +				ret = 0;
> +				break;
> +			case IIO_EV_DIR_FALLING:
> +				chip->tsl2x7x_settings.als_thresh_low = val;
> +				ret = 0;
> +				break;
> +			default:
> +				break;
> +			}
> +		} else {
> +			switch (dir) {
> +			case IIO_EV_DIR_RISING:
> +				chip->tsl2x7x_settings.prox_thres_high = val;
> +				ret = 0;
> +				break;
> +			case IIO_EV_DIR_FALLING:
> +				chip->tsl2x7x_settings.prox_thres_low = val;
> +				ret = 0;
> +				break;
> +			default:
> +				break;
> +			}
>  		}
> +		break;
> +	default:
> +		break;
>  	}
>  
> -	tsl2x7x_invoke_change(indio_dev);
> +	if (ret < 0)
> +		return ret;
>  
> -	return 0;
> +	return tsl2x7x_invoke_change(indio_dev);
>  }
>  
> -static int tsl2x7x_read_thresh(struct iio_dev *indio_dev,
> -			       const struct iio_chan_spec *chan,
> -			       enum iio_event_type type,
> -			       enum iio_event_direction dir,
> -				   enum iio_event_info info,
> -			       int *val, int *val2)
> +static int tsl2x7x_read_event_value(struct iio_dev *indio_dev,
> +				    const struct iio_chan_spec *chan,
> +				    enum iio_event_type type,
> +				    enum iio_event_direction dir,
> +				    enum iio_event_info info,
> +				    int *val, int *val2)
>  {
>  	struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> +	int ret = -EINVAL;
>  
> -	if (chan->type == IIO_INTENSITY) {
> -		switch (dir) {
> -		case IIO_EV_DIR_RISING:
> -			*val = chip->tsl2x7x_settings.als_thresh_high;
> -			break;
> -		case IIO_EV_DIR_FALLING:
> -			*val = chip->tsl2x7x_settings.als_thresh_low;
> -			break;
> -		default:
> -			return -EINVAL;
> -		}
> -	} else {
> -		switch (dir) {
> -		case IIO_EV_DIR_RISING:
> -			*val = chip->tsl2x7x_settings.prox_thres_high;
> -			break;
> -		case IIO_EV_DIR_FALLING:
> -			*val = chip->tsl2x7x_settings.prox_thres_low;
> -			break;
> -		default:
> -			return -EINVAL;
> +	switch (info) {
> +	case IIO_EV_INFO_VALUE:
> +		if (chan->type == IIO_INTENSITY) {
> +			switch (dir) {
> +			case IIO_EV_DIR_RISING:
> +				*val = chip->tsl2x7x_settings.als_thresh_high;
> +				ret = IIO_VAL_INT;
> +				break;
> +			case IIO_EV_DIR_FALLING:
> +				*val = chip->tsl2x7x_settings.als_thresh_low;
> +				ret = IIO_VAL_INT;
> +				break;
> +			default:
> +				break;
> +			}
> +		} else {
> +			switch (dir) {
> +			case IIO_EV_DIR_RISING:
> +				*val = chip->tsl2x7x_settings.prox_thres_high;
> +				ret = IIO_VAL_INT;
> +				break;
> +			case IIO_EV_DIR_FALLING:
> +				*val = chip->tsl2x7x_settings.prox_thres_low;
> +				ret = IIO_VAL_INT;
> +				break;
> +			default:
> +				break;
> +			}
>  		}
> +		break;
> +	default:
> +		break;
>  	}
>  
> -	return IIO_VAL_INT;
> +	return ret;
>  }
>  
>  static int tsl2x7x_read_raw(struct iio_dev *indio_dev,
> @@ -1615,8 +1638,8 @@ static const struct iio_info tsl2X7X_device_info[] = {
>  		.driver_module = THIS_MODULE,
>  		.read_raw = &tsl2x7x_read_raw,
>  		.write_raw = &tsl2x7x_write_raw,
> -		.read_event_value = &tsl2x7x_read_thresh,
> -		.write_event_value = &tsl2x7x_write_thresh,
> +		.read_event_value = &tsl2x7x_read_event_value,
> +		.write_event_value = &tsl2x7x_write_event_value,
>  		.read_event_config = &tsl2x7x_read_interrupt_config,
>  		.write_event_config = &tsl2x7x_write_interrupt_config,
>  	},
> @@ -1626,8 +1649,8 @@ static const struct iio_info tsl2X7X_device_info[] = {
>  		.driver_module = THIS_MODULE,
>  		.read_raw = &tsl2x7x_read_raw,
>  		.write_raw = &tsl2x7x_write_raw,
> -		.read_event_value = &tsl2x7x_read_thresh,
> -		.write_event_value = &tsl2x7x_write_thresh,
> +		.read_event_value = &tsl2x7x_read_event_value,
> +		.write_event_value = &tsl2x7x_write_event_value,
>  		.read_event_config = &tsl2x7x_read_interrupt_config,
>  		.write_event_config = &tsl2x7x_write_interrupt_config,
>  	},
> @@ -1637,8 +1660,8 @@ static const struct iio_info tsl2X7X_device_info[] = {
>  		.driver_module = THIS_MODULE,
>  		.read_raw = &tsl2x7x_read_raw,
>  		.write_raw = &tsl2x7x_write_raw,
> -		.read_event_value = &tsl2x7x_read_thresh,
> -		.write_event_value = &tsl2x7x_write_thresh,
> +		.read_event_value = &tsl2x7x_read_event_value,
> +		.write_event_value = &tsl2x7x_write_event_value,
>  		.read_event_config = &tsl2x7x_read_interrupt_config,
>  		.write_event_config = &tsl2x7x_write_interrupt_config,
>  	},
> @@ -1648,8 +1671,8 @@ static const struct iio_info tsl2X7X_device_info[] = {
>  		.driver_module = THIS_MODULE,
>  		.read_raw = &tsl2x7x_read_raw,
>  		.write_raw = &tsl2x7x_write_raw,
> -		.read_event_value = &tsl2x7x_read_thresh,
> -		.write_event_value = &tsl2x7x_write_thresh,
> +		.read_event_value = &tsl2x7x_read_event_value,
> +		.write_event_value = &tsl2x7x_write_event_value,
>  		.read_event_config = &tsl2x7x_read_interrupt_config,
>  		.write_event_config = &tsl2x7x_write_interrupt_config,
>  	},
> @@ -1659,8 +1682,8 @@ static const struct iio_info tsl2X7X_device_info[] = {
>  		.driver_module = THIS_MODULE,
>  		.read_raw = &tsl2x7x_read_raw,
>  		.write_raw = &tsl2x7x_write_raw,
> -		.read_event_value = &tsl2x7x_read_thresh,
> -		.write_event_value = &tsl2x7x_write_thresh,
> +		.read_event_value = &tsl2x7x_read_event_value,
> +		.write_event_value = &tsl2x7x_write_event_value,
>  		.read_event_config = &tsl2x7x_read_interrupt_config,
>  		.write_event_config = &tsl2x7x_write_interrupt_config,
>  	},