Re: [PATCH 1/2] iio: cros_ec: do an early exit if not physical_device case

[Jonathan Cameron <jic23@kernel.org>]

On Mon, 23 Nov 2020 16:40:16 +0200
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> This whole code-block was put under one big if() condition/block.
> This change does an early return if the 'physical_device' boolean is false,
> thus unindenting the block by one level.
> 
> No other functional change has been done.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
@Gwendal, others  This series from Alex has been outstanding for a while
but may well still apply.
Ideally looking for an ack.

Thanks,

Jonathan
 
> ---
>  .../cros_ec_sensors/cros_ec_sensors_core.c    | 161 +++++++++---------
>  1 file changed, 81 insertions(+), 80 deletions(-)
> 
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index 5c6c4e6fec9b..9470014936f2 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -287,89 +287,90 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>  
>  	indio_dev->name = pdev->name;
>  
> -	if (physical_device) {
> -		state->param.cmd = MOTIONSENSE_CMD_INFO;
> -		state->param.info.sensor_num = sensor_platform->sensor_num;
> -		ret = cros_ec_motion_send_host_cmd(state, 0);
> -		if (ret) {
> -			dev_warn(dev, "Can not access sensor info\n");
> +	if (!physical_device)
> +		return 0;
> +
> +	state->param.cmd = MOTIONSENSE_CMD_INFO;
> +	state->param.info.sensor_num = sensor_platform->sensor_num;
> +	ret = cros_ec_motion_send_host_cmd(state, 0);
> +	if (ret) {
> +		dev_warn(dev, "Can not access sensor info\n");
> +		return ret;
> +	}
> +	state->type = state->resp->info.type;
> +	state->loc = state->resp->info.location;
> +
> +	/* Set sign vector, only used for backward compatibility. */
> +	memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS);
> +
> +	for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
> +		state->calib[i].scale = MOTION_SENSE_DEFAULT_SCALE;
> +
> +	/* 0 is a correct value used to stop the device */
> +	if (state->msg->version < 3) {
> +		get_default_min_max_freq(state->resp->info.type,
> +					 &frequencies[1],
> +					 &frequencies[2],
> +					 &state->fifo_max_event_count);
> +	} else {
> +		frequencies[1] = state->resp->info_3.min_frequency;
> +		frequencies[2] = state->resp->info_3.max_frequency;
> +		state->fifo_max_event_count =
> +		    state->resp->info_3.fifo_max_event_count;
> +	}
> +	for (i = 0; i < ARRAY_SIZE(frequencies); i++) {
> +		state->frequencies[2 * i] = frequencies[i] / 1000;
> +		state->frequencies[2 * i + 1] =
> +			(frequencies[i] % 1000) * 1000;
> +	}
> +
> +	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
> +		/*
> +		 * Create a software buffer, feed by the EC FIFO.
> +		 * We can not use trigger here, as events are generated
> +		 * as soon as sample_frequency is set.
> +		 */
> +		struct iio_buffer *buffer;
> +
> +		buffer = devm_iio_kfifo_allocate(dev);
> +		if (!buffer)
> +			return -ENOMEM;
> +
> +		iio_device_attach_buffer(indio_dev, buffer);
> +		indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> +
> +		ret = cros_ec_sensorhub_register_push_data(
> +				sensor_hub, sensor_platform->sensor_num,
> +				indio_dev, push_data);
> +		if (ret)
>  			return ret;
> -		}
> -		state->type = state->resp->info.type;
> -		state->loc = state->resp->info.location;
>  
> -		/* Set sign vector, only used for backward compatibility. */
> -		memset(state->sign, 1, CROS_EC_SENSOR_MAX_AXIS);
> +		ret = devm_add_action_or_reset(
> +				dev, cros_ec_sensors_core_clean, pdev);
> +		if (ret)
> +			return ret;
>  
> -		for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
> -			state->calib[i].scale = MOTION_SENSE_DEFAULT_SCALE;
> -
> -		/* 0 is a correct value used to stop the device */
> -		if (state->msg->version < 3) {
> -			get_default_min_max_freq(state->resp->info.type,
> -						 &frequencies[1],
> -						 &frequencies[2],
> -						 &state->fifo_max_event_count);
> -		} else {
> -			frequencies[1] = state->resp->info_3.min_frequency;
> -			frequencies[2] = state->resp->info_3.max_frequency;
> -			state->fifo_max_event_count =
> -			    state->resp->info_3.fifo_max_event_count;
> -		}
> -		for (i = 0; i < ARRAY_SIZE(frequencies); i++) {
> -			state->frequencies[2 * i] = frequencies[i] / 1000;
> -			state->frequencies[2 * i + 1] =
> -				(frequencies[i] % 1000) * 1000;
> -		}
> -
> -		if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
> -			/*
> -			 * Create a software buffer, feed by the EC FIFO.
> -			 * We can not use trigger here, as events are generated
> -			 * as soon as sample_frequency is set.
> -			 */
> -			struct iio_buffer *buffer;
> -
> -			buffer = devm_iio_kfifo_allocate(dev);
> -			if (!buffer)
> -				return -ENOMEM;
> -
> -			iio_device_attach_buffer(indio_dev, buffer);
> -			indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> -
> -			ret = cros_ec_sensorhub_register_push_data(
> -					sensor_hub, sensor_platform->sensor_num,
> -					indio_dev, push_data);
> -			if (ret)
> -				return ret;
> -
> -			ret = devm_add_action_or_reset(
> -					dev, cros_ec_sensors_core_clean, pdev);
> -			if (ret)
> -				return ret;
> -
> -			/* Timestamp coming from FIFO are in ns since boot. */
> -			ret = iio_device_set_clock(indio_dev, CLOCK_BOOTTIME);
> -			if (ret)
> -				return ret;
> -		} else {
> -			const struct attribute **fifo_attrs;
> -
> -			if (has_hw_fifo)
> -				fifo_attrs = cros_ec_sensor_fifo_attributes;
> -			else
> -				fifo_attrs = NULL;
> -
> -			/*
> -			 * The only way to get samples in buffer is to set a
> -			 * software trigger (systrig, hrtimer).
> -			 */
> -			ret = devm_iio_triggered_buffer_setup_ext(
> -					dev, indio_dev, NULL, trigger_capture,
> -					NULL, fifo_attrs);
> -			if (ret)
> -				return ret;
> -		}
> +		/* Timestamp coming from FIFO are in ns since boot. */
> +		ret = iio_device_set_clock(indio_dev, CLOCK_BOOTTIME);
> +		if (ret)
> +			return ret;
> +	} else {
> +		const struct attribute **fifo_attrs;
> +
> +		if (has_hw_fifo)
> +			fifo_attrs = cros_ec_sensor_fifo_attributes;
> +		else
> +			fifo_attrs = NULL;
> +
> +		/*
> +		 * The only way to get samples in buffer is to set a
> +		 * software trigger (systrig, hrtimer).
> +		 */
> +		ret = devm_iio_triggered_buffer_setup_ext(
> +				dev, indio_dev, NULL, trigger_capture,
> +				NULL, fifo_attrs);
> +		if (ret)
> +			return ret;
>  	}
>  
>  	return 0;