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: 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>
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@ -347,6 +347,7 @@ int iio_trigger_detach_poll_func(struct iio_trigger *trig,
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iio_trigger_put_irq(trig, pf->irq);
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iio_trigger_put_irq(trig, pf->irq);
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free_irq(pf->irq, pf);
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free_irq(pf->irq, pf);
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module_put(iio_dev_opaque->driver_module);
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module_put(iio_dev_opaque->driver_module);
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pf->irq = 0;
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return ret;
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return ret;
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}
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}
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@ -770,3 +771,29 @@ void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
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if (indio_dev->trig)
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if (indio_dev->trig)
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iio_trigger_put(indio_dev->trig);
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iio_trigger_put(indio_dev->trig);
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}
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}
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int iio_device_suspend_triggering(struct iio_dev *indio_dev)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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guard(mutex)(&iio_dev_opaque->mlock);
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if ((indio_dev->pollfunc) && (indio_dev->pollfunc->irq > 0))
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disable_irq(indio_dev->pollfunc->irq);
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return 0;
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}
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EXPORT_SYMBOL(iio_device_suspend_triggering);
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int iio_device_resume_triggering(struct iio_dev *indio_dev)
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{
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struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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guard(mutex)(&iio_dev_opaque->mlock);
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if ((indio_dev->pollfunc) && (indio_dev->pollfunc->irq > 0))
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enable_irq(indio_dev->pollfunc->irq);
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return 0;
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}
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EXPORT_SYMBOL(iio_device_resume_triggering);
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@ -810,6 +810,23 @@ static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
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}
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}
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#endif
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#endif
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/**
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* iio_device_suspend_triggering() - suspend trigger attached to an iio_dev
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* @indio_dev: iio_dev associated with the device that will have triggers suspended
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*
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* Return 0 if successful, negative otherwise
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**/
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int iio_device_suspend_triggering(struct iio_dev *indio_dev);
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/**
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* iio_device_resume_triggering() - resume trigger attached to an iio_dev
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* that was previously suspended with iio_device_suspend_triggering()
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* @indio_dev: iio_dev associated with the device that will have triggers resumed
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*
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* Return 0 if successful, negative otherwise
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**/
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int iio_device_resume_triggering(struct iio_dev *indio_dev);
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#ifdef CONFIG_ACPI
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#ifdef CONFIG_ACPI
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bool iio_read_acpi_mount_matrix(struct device *dev,
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bool iio_read_acpi_mount_matrix(struct device *dev,
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struct iio_mount_matrix *orientation,
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struct iio_mount_matrix *orientation,
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