Re: [PATCH v3 3/8] iio: common: cros_ec_sensors: move registration to core

[Jonathan Cameron <jic23@jic23.retrosnub.co.uk>]

On Sat, 22 Jun 2019 11:13:08 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Tue, 18 Jun 2019 11:06:34 +0200
> Fabien Lahoudere <fabien.lahoudere@collabora.com> wrote:
> 
> > In order to simplify derivated drivers from cros_ec_sensors_core,
> > a new core function is created to registered IIO stricture.
> > 
> > Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>  
> This one looks good to me.
> I'll pick it up once the minor stuff in other patches is sorted.

Sorry, I confused a couple of patches as held some of these back
in my queue to see how you used them later.

This one I'm actually unconvinced by.  It's a 'cleanup'
that adds code and hides what is going on. I was expecting to find
more stuff being added to the resulting function later in the series.
I didn't find any, but may have missed something.

So not keen on this one patch in the series!

thanks,

Jonathan

> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  .../common/cros_ec_sensors/cros_ec_sensors.c  |  9 +-
> >  .../cros_ec_sensors/cros_ec_sensors_core.c    | 97 ++++++++++++-------
> >  drivers/iio/light/cros_ec_light_prox.c        |  7 +-
> >  drivers/iio/pressure/cros_ec_baro.c           |  7 +-
> >  .../linux/iio/common/cros_ec_sensors_core.h   | 16 ++-
> >  5 files changed, 72 insertions(+), 64 deletions(-)
> > 
> > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > index 897dc83a3355..c4bee9265246 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > @@ -14,7 +14,7 @@
> >  #include <linux/iio/iio.h>
> >  #include <linux/iio/kfifo_buf.h>
> >  #include <linux/iio/trigger_consumer.h>
> > -#include <linux/iio/triggered_buffer.h>
> > +
> >  #include <linux/kernel.h>
> >  #include <linux/mfd/cros_ec.h>
> >  #include <linux/mfd/cros_ec_commands.h>
> > @@ -233,12 +233,7 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
> >  	else
> >  		state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
> >  
> > -	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> > -			cros_ec_sensors_capture, NULL);
> > -	if (ret)
> > -		return ret;
> > -
> > -	return devm_iio_device_register(dev, indio_dev);
> > +	return cros_ec_sensors_core_register(pdev, indio_dev);
> >  }
> >  
> >  static const struct platform_device_id cros_ec_sensors_ids[] = {
> > 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 e5181e007dd7..3880849c5cca 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
> > @@ -12,6 +12,7 @@
> >  #include <linux/iio/iio.h>
> >  #include <linux/iio/kfifo_buf.h>
> >  #include <linux/iio/trigger_consumer.h>
> > +#include <linux/iio/triggered_buffer.h>
> >  #include <linux/kernel.h>
> >  #include <linux/mfd/cros_ec.h>
> >  #include <linux/mfd/cros_ec_commands.h>
> > @@ -95,6 +96,67 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> >  }
> >  EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init);
> >  
> > +/**
> > + * cros_ec_sensors_capture() - the trigger handler function
> > + * @irq:	the interrupt number.
> > + * @p:		a pointer to the poll function.
> > + *
> > + * On a trigger event occurring, if the pollfunc is attached then this
> > + * handler is called as a threaded interrupt (and hence may sleep). It
> > + * is responsible for grabbing data from the device and pushing it into
> > + * the associated buffer.
> > + *
> > + * Return: IRQ_HANDLED
> > + */
> > +static irqreturn_t cros_ec_sensors_capture(int irq, void *p)
> > +{
> > +	struct iio_poll_func *pf = p;
> > +	struct iio_dev *indio_dev = pf->indio_dev;
> > +	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> > +	int ret;
> > +
> > +	mutex_lock(&st->cmd_lock);
> > +
> > +	/* Clear capture data. */
> > +	memset(st->samples, 0, indio_dev->scan_bytes);
> > +
> > +	/* Read data based on which channels are enabled in scan mask. */
> > +	ret = st->read_ec_sensors_data(indio_dev,
> > +				       *indio_dev->active_scan_mask,
> > +				       (s16 *)st->samples);
> > +	if (ret < 0)
> > +		goto done;
> > +
> > +	iio_push_to_buffers_with_timestamp(indio_dev, st->samples,
> > +					   iio_get_time_ns(indio_dev));
> > +
> > +done:
> > +	/*
> > +	 * Tell the core we are done with this trigger and ready for the
> > +	 * next one.
> > +	 */
> > +	iio_trigger_notify_done(indio_dev->trig);
> > +
> > +	mutex_unlock(&st->cmd_lock);
> > +
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +int cros_ec_sensors_core_register(struct platform_device *pdev,
> > +				  struct iio_dev *indio_dev)
> > +{
> > +	int ret;
> > +	struct device *dev = &pdev->dev;
> > +
> > +	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> > +					      cros_ec_sensors_capture, NULL);
> > +	if (ret)
> > +		return ret;
> > +
> > +	return devm_iio_device_register(dev, indio_dev);
> > +}
> > +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_register);
> > +
> >  int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *state,
> >  				 u16 opt_length)
> >  {
> > @@ -380,41 +442,6 @@ int cros_ec_sensors_read_cmd(struct iio_dev *indio_dev,
> >  }
> >  EXPORT_SYMBOL_GPL(cros_ec_sensors_read_cmd);
> >  
> > -irqreturn_t cros_ec_sensors_capture(int irq, void *p)
> > -{
> > -	struct iio_poll_func *pf = p;
> > -	struct iio_dev *indio_dev = pf->indio_dev;
> > -	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> > -	int ret;
> > -
> > -	mutex_lock(&st->cmd_lock);
> > -
> > -	/* Clear capture data. */
> > -	memset(st->samples, 0, indio_dev->scan_bytes);
> > -
> > -	/* Read data based on which channels are enabled in scan mask. */
> > -	ret = st->read_ec_sensors_data(indio_dev,
> > -				       *(indio_dev->active_scan_mask),
> > -				       (s16 *)st->samples);
> > -	if (ret < 0)
> > -		goto done;
> > -
> > -	iio_push_to_buffers_with_timestamp(indio_dev, st->samples,
> > -					   iio_get_time_ns(indio_dev));
> > -
> > -done:
> > -	/*
> > -	 * Tell the core we are done with this trigger and ready for the
> > -	 * next one.
> > -	 */
> > -	iio_trigger_notify_done(indio_dev->trig);
> > -
> > -	mutex_unlock(&st->cmd_lock);
> > -
> > -	return IRQ_HANDLED;
> > -}
> > -EXPORT_SYMBOL_GPL(cros_ec_sensors_capture);
> > -
> >  int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
> >  			  struct iio_chan_spec const *chan,
> >  			  int *val, int *val2, long mask)
> > diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> > index 32ea5afd495f..682dc19c2bf3 100644> --- a/drivers/iio/light/cros_ec_light_prox.c
> > +++ b/drivers/iio/light/cros_ec_light_prox.c
> > @@ -215,12 +215,7 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
> >  
> >  	state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
> >  
> > -	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> > -					      cros_ec_sensors_capture, NULL);
> > -	if (ret)
> > -		return ret;
> > -
> > -	return devm_iio_device_register(dev, indio_dev);
> > +	return cros_ec_sensors_core_register(pdev, indio_dev);
> >  }
> >  
> >  static const struct platform_device_id cros_ec_light_prox_ids[] = {
> > diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
> > index 8718036d74d2..9d3745bc2fba 100644
> > --- a/drivers/iio/pressure/cros_ec_baro.c
> > +++ b/drivers/iio/pressure/cros_ec_baro.c
> > @@ -152,12 +152,7 @@ static int cros_ec_baro_probe(struct platform_device *pdev)
> >  
> >  	state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
> >  
> > -	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
> > -					      cros_ec_sensors_capture, NULL);
> > -	if (ret)
> > -		return ret;
> > -
> > -	return devm_iio_device_register(dev, indio_dev);
> > +	return cros_ec_sensors_core_register(pdev, indio_dev);
> >  }
> >  
> >  static const struct platform_device_id cros_ec_baro_ids[] = {
> > diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> > index 485c649b421f..60f40d253f4a 100644
> > --- a/include/linux/iio/common/cros_ec_sensors_core.h
> > +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> > @@ -116,18 +116,14 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> >  			      bool physical_device);
> >  
> >  /**
> > - * cros_ec_sensors_capture() - the trigger handler function
> > - * @irq:	the interrupt number.
> > - * @p:		a pointer to the poll function.
> > - *
> > - * On a trigger event occurring, if the pollfunc is attached then this
> > - * handler is called as a threaded interrupt (and hence may sleep). It
> > - * is responsible for grabbing data from the device and pushing it into
> > - * the associated buffer.
> > + * cros_ec_sensors_core_register() - registration of the core structure
> > + * @pdev:		platform device created for the sensors
> > + * @indio_dev:		iio device structure of the device
> >   *
> > - * Return: IRQ_HANDLED
> > + * Return: 0 on success, -errno on failure.
> >   */
> > -irqreturn_t cros_ec_sensors_capture(int irq, void *p);
> > +int cros_ec_sensors_core_register(struct platform_device *pdev,
> > +				  struct iio_dev *indio_dev);
> >  
> >  /**
> >   * cros_ec_core_channel_init() - initialize channel  
>