Re: [PATCH v2 2/6] iio: imu: adis: Add irq mask variable

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On 3/16/20 1:53 PM, Nuno Sá wrote:
There are some ADIS devices that can configure the data ready pin
polarity. Hence, we cannot hardcode our IRQ mask as IRQF_TRIGGER_RISING
since we might want to have it as IRQF_TRIGGER_FALLING.

Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
Changes in v2:
  * Add kernel doc-string for `irq-mask`.

  drivers/iio/imu/adis_trigger.c | 26 ++++++++++++++++++++++++--
  include/linux/iio/imu/adis.h   |  2 ++
  2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/imu/adis_trigger.c b/drivers/iio/imu/adis_trigger.c
index 9e393819d238..21eddffc50d3 100644
--- a/drivers/iio/imu/adis_trigger.c
+++ b/drivers/iio/imu/adis_trigger.c
@@ -34,6 +34,20 @@ static inline void adis_trigger_setup(struct adis *adis)
  	iio_trigger_set_drvdata(adis->trig, adis);
  }
+static inline int __adis_validate_irq_mask(struct adis *adis)

Bit of a nitpick, I'd drop the __ prefix, so far we only used it if there is a locked and an unlocked version of a function and it is unlikely that we'll need an unlocked function here.

I'd also drop the inline the compiler is smart enough to figure this out on its own. I believe the recommendation at the moment for kernel code is to use inline only for functions defined in header files.

+{
+	if (!adis->irq_mask) {
+		adis->irq_mask = IRQF_TRIGGER_RISING;
+		return 0;
+	} else if (adis->irq_mask != IRQF_TRIGGER_RISING &&
+		   adis->irq_mask != IRQF_TRIGGER_FALLING) {
+		dev_err(&adis->spi->dev, "Invalid IRQ mask:%08lx\n",

Another nitpick. Space behind the ":".

+			adis->irq_mask);
+		return -EINVAL;
+	}
+
+	return 0;
+}
  /**
   * adis_probe_trigger() - Sets up trigger for a adis device
   * @adis: The adis device
@@ -54,9 +68,13 @@ int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
adis_trigger_setup(adis); + ret = __adis_validate_irq_mask(adis);
+	if (ret)
+		return ret;
+
  	ret = request_irq(adis->spi->irq,
  			  &iio_trigger_generic_data_rdy_poll,
-			  IRQF_TRIGGER_RISING,
+			  adis->irq_mask,
  			  indio_dev->name,
  			  adis->trig);
  	if (ret)
@@ -96,9 +114,13 @@ int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
adis_trigger_setup(adis); + ret = __adis_validate_irq_mask(adis);
+	if (ret)
+		return ret;
+
  	ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
  			       &iio_trigger_generic_data_rdy_poll,
-			       IRQF_TRIGGER_RISING,
+			       adis->irq_mask,
  			       indio_dev->name,
  			       adis->trig);
  	if (ret)
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index ac94c483bf2b..ed41c6b96d14 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -87,6 +87,7 @@ struct adis_data {
   * @msg: SPI message object
   * @xfer: SPI transfer objects to be used for a @msg
   * @current_page: Some ADIS devices have registers, this selects current page
+ * @irq_mask: IRQ handling flags as passed to request_irq()
   * @buffer: Data buffer for information read from the device
   * @tx: DMA safe TX buffer for SPI transfers
   * @rx: DMA safe RX buffer for SPI transfers
@@ -113,6 +114,7 @@ struct adis {
  	struct spi_message	msg;
  	struct spi_transfer	*xfer;
  	unsigned int		current_page;
+	unsigned long		irq_mask;
  	void			*buffer;
uint8_t tx[10] ____cacheline_aligned;





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