Commit 2837efdc authored by Denis Benato's avatar Denis Benato Committed by Jonathan Cameron
Browse files

iio: trigger: allow devices to suspend/resume theirs associated trigger 



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: default avatarDenis Benato <benato.denis96@gmail.com>
Link: https://patch.msgid.link/20240807185619.7261-2-benato.denis96@gmail.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent b4b4817b

drivers/iio/industrialio-trigger.c

+27 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/iio/iio.h

+17 −0
Original line number Diff line number Diff line
@@ -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,