When a machine enters a sleep state while a trigger is associated to
an iio device that trigger is not resumed after exiting the sleep state:
provide iio device drivers a way to suspend and resume
the associated trigger to solve the aforementioned bug.
Each iio driver supporting external triggers is expected to call
iio_device_suspend_triggering before suspending,
and iio_device_resume_triggering upon resuming.
Signed-off-by: Denis Benato <benato.denis96@xxxxxxxxx>
---
drivers/iio/industrialio-trigger.c | 27 +++++++++++++++++++++++++++
include/linux/iio/iio.h | 17 +++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index 2e84776f4fbd..54416a384232 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -347,6 +347,7 @@ int iio_trigger_detach_poll_func(struct iio_trigger *trig,
iio_trigger_put_irq(trig, pf->irq);
free_irq(pf->irq, pf);
module_put(iio_dev_opaque->driver_module);
+ pf->irq = 0;
return ret;
}
@@ -770,3 +771,29 @@ void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
if (indio_dev->trig)
iio_trigger_put(indio_dev->trig);
}
+
+int iio_device_suspend_triggering(struct iio_dev *indio_dev)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
+ guard(mutex)(&iio_dev_opaque->mlock);
+
+ if ((indio_dev->pollfunc) && (indio_dev->pollfunc->irq > 0))
+ disable_irq(indio_dev->pollfunc->irq);
+
+ return 0;
+}
+EXPORT_SYMBOL(iio_device_suspend_triggering);
+
+int iio_device_resume_triggering(struct iio_dev *indio_dev)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
+ guard(mutex)(&iio_dev_opaque->mlock);
+
+ if ((indio_dev->pollfunc) && (indio_dev->pollfunc->irq > 0))
+ enable_irq(indio_dev->pollfunc->irq);
+
+ return 0;
+}
+EXPORT_SYMBOL(iio_device_resume_triggering);
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index f6c0499853bb..c66c784d31e4 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -810,6 +810,23 @@ static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
}
#endif
+/**
+ * iio_device_suspend_triggering() - suspend trigger attached to an iio_dev
+ * @indio_dev: iio_dev associated with the device that will have triggers suspended
+ *
+ * Return 0 if successful, negative otherwise
+ **/
+int iio_device_suspend_triggering(struct iio_dev *indio_dev);
+
+/**
+ * iio_device_resume_triggering() - resume trigger attached to an iio_dev
+ * that was previously suspended with iio_device_suspend_triggering()
+ * @indio_dev: iio_dev associated with the device that will have triggers resumed
+ *
+ * Return 0 if successful, negative otherwise
+ **/
+int iio_device_resume_triggering(struct iio_dev *indio_dev);
+
#ifdef CONFIG_ACPI
bool iio_read_acpi_mount_matrix(struct device *dev,
struct iio_mount_matrix *orientation,
--
2.46.0
