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

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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@gmail.com>
Link: https://patch.msgid.link/20240807185619.7261-2-benato.denis96@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Denis Benato 2024-08-07 20:56:18 +02:00 committed by Jonathan Cameron
parent b4b4817bbf
commit 2837efdc7c
2 changed files with 44 additions and 0 deletions
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27
drivers/iio/industrialio-trigger.c
View file

@ -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);

17
include/linux/iio/iio.h
View file

@ -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,