[PATCH 1/5] iio: imu: adis: Add Managed device functions

Nuno Sá
2020-02-25T12:41:26Z

This patch adds support for a managed device version of
adis_setup_buffer_and_trigger. It works exactly as the original
one but it calls all the devm_iio_* functions to setup an iio
buffer and trigger. Hence we do not need to care about cleaning those
and we do not need to support a remove() callback for every driver using
the adis library.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
drivers/iio/imu/adis_buffer.c | 34 +++++++++++++++++++++++++++++
drivers/iio/imu/adis_trigger.c | 39 +++++++++++++++++++++++++++++++---
include/linux/iio/imu/adis.h | 17 +++++++++++++++
3 files changed, 87 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
index 3f4dd5c00b03..296036a01d39 100644
--- a/drivers/iio/imu/adis_buffer.c
+++ b/drivers/iio/imu/adis_buffer.c
@@ -196,7 +196,41 @@ int adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
return ret;
}
EXPORT_SYMBOL_GPL(adis_setup_buffer_and_trigger);
+/**
+ * devm_adis_setup_buffer_and_trigger() - Sets up buffer and trigger for
+ * the managed adis device
+ * @adis: The adis device
+ * @indio_dev: The IIO device
+ * @trigger_handler: Optional trigger handler, may be NULL.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function perfoms exactly the same as adis_setup_buffer_and_trigger()
+ */
+int
+devm_adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
+ irqreturn_t (*trigger_handler)(int, void *))
+{
+ int ret;
+
+ if (!trigger_handler)
+ trigger_handler = adis_trigger_handler;
+
+ ret = devm_iio_triggered_buffer_setup(&adis->spi->dev, indio_dev,
+ &iio_pollfunc_store_time,
+ trigger_handler, NULL);
+ if (ret)
+ return ret;
+
+ if (adis->spi->irq) {
+ ret = devm_adis_probe_trigger(adis, indio_dev);
+ if (ret)
+ return ret;
+ }

+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_adis_setup_buffer_and_trigger);
/**
* adis_cleanup_buffer_and_trigger() - Free buffer and trigger resources
* @adis: The adis device.
diff --git a/drivers/iio/imu/adis_trigger.c b/drivers/iio/imu/adis_trigger.c
index 8b9cd02c0f9f..a07dcc365c18 100644
--- a/drivers/iio/imu/adis_trigger.c
+++ b/drivers/iio/imu/adis_trigger.c
@@ -27,6 +27,13 @@ static const struct iio_trigger_ops adis_trigger_ops = {
.set_trigger_state = &adis_data_rdy_trigger_set_state,
};

+static inline void adis_trigger_setup(struct adis *adis)
+{
+ adis->trig->dev.parent = &adis->spi->dev;
+ adis->trig->ops = &adis_trigger_ops;
+ iio_trigger_set_drvdata(adis->trig, adis);
+}
+
/**
* adis_probe_trigger() - Sets up trigger for a adis device
* @adis: The adis device
@@ -45,9 +52,7 @@ int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
if (adis->trig == NULL)
return -ENOMEM;

- adis->trig->dev.parent = &adis->spi->dev;
- adis->trig->ops = &adis_trigger_ops;
- iio_trigger_set_drvdata(adis->trig, adis);
+ adis_trigger_setup(adis);

ret = request_irq(adis->spi->irq,
&iio_trigger_generic_data_rdy_poll,
@@ -72,7 +77,35 @@ int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
return ret;
}
EXPORT_SYMBOL_GPL(adis_probe_trigger);
+/**
+ * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
+ * @adis: The adis device
+ * @indio_dev: The IIO device
+ *
+ * Returns 0 on success or a negative error code
+ */
+int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
+{
+ int ret;

+ adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
+ indio_dev->name, indio_dev->id);
+ if (!adis->trig)
+ return -ENOMEM;
+
+ adis_trigger_setup(adis);
+
+ ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
+ &iio_trigger_generic_data_rdy_poll,
+ IRQF_TRIGGER_RISING,
+ indio_dev->name,
+ adis->trig);
+ if (ret)
+ return ret;
+
+ return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
+}
+EXPORT_SYMBOL_GPL(devm_adis_probe_trigger);
/**
* adis_remove_trigger() - Remove trigger for a adis devices
* @adis: The adis device
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index ac7cfd073804..741512b28aaa 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -419,11 +419,15 @@ struct adis_burst {
unsigned int extra_len;
};

+int
+devm_adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
+ irqreturn_t (*trigger_handler)(int, void *));
int adis_setup_buffer_and_trigger(struct adis *adis,
struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
void adis_cleanup_buffer_and_trigger(struct adis *adis,
struct iio_dev *indio_dev);

+int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev);
int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev);
void adis_remove_trigger(struct adis *adis);

@@ -432,6 +436,13 @@ int adis_update_scan_mode(struct iio_dev *indio_dev,

#else /* CONFIG_IIO_BUFFER */

+static inline int
+devm_adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
+ irqreturn_t (*trigger_handler)(int, void *))
+{
+ return 0;
+}
+
static inline int adis_setup_buffer_and_trigger(struct adis *adis,
struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *))
{
@@ -443,6 +454,12 @@ static inline void adis_cleanup_buffer_and_trigger(struct adis *adis,
{
}

+static inline int devm_adis_probe_trigger(struct adis *adis,
+ struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
static inline int adis_probe_trigger(struct adis *adis,
struct iio_dev *indio_dev)
{
--
2.25.1