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Date:   Sat, 22 Jun 2019 11:13:08 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Fabien Lahoudere <fabien.lahoudere@collabora.com>
Cc:     kernel@collabora.com, Hartmut Knaack <knaack.h@gmx.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/8] iio: common: cros_ec_sensors: move registration
 to core
Message-ID: <20190622111308.524a2c75@archlinux>
In-Reply-To: <2edb6d26030dbde1952bc1b25b6ca666233adfac.1560848479.git.fabien.lahoudere@collabora.com>
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        <2edb6d26030dbde1952bc1b25b6ca666233adfac.1560848479.git.fabien.lahoudere@collabora.com>
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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.

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