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staging:iio:events: Add poll support
Add poll support to the event queue. This will allow us to check for pending events in a application's event loop using poll() or similar. Since we already have support for blocking reads adding poll support as well is trivial. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -15,6 +15,7 @@
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#include <linux/kernel.h>
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#include <linux/kfifo.h>
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#include <linux/module.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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@ -57,7 +58,7 @@ int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
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copied = kfifo_put(&ev_int->det_events, &ev);
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if (copied != 0)
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wake_up_locked(&ev_int->wait);
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wake_up_locked_poll(&ev_int->wait, POLLIN);
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}
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spin_unlock(&ev_int->wait.lock);
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@ -65,6 +66,25 @@ int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
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}
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EXPORT_SYMBOL(iio_push_event);
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/**
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* iio_event_poll() - poll the event queue to find out if it has data
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*/
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static unsigned int iio_event_poll(struct file *filep,
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struct poll_table_struct *wait)
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{
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struct iio_event_interface *ev_int = filep->private_data;
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unsigned int events = 0;
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poll_wait(filep, &ev_int->wait, wait);
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spin_lock(&ev_int->wait.lock);
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if (!kfifo_is_empty(&ev_int->det_events))
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events = POLLIN | POLLRDNORM;
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spin_unlock(&ev_int->wait.lock);
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return events;
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}
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static ssize_t iio_event_chrdev_read(struct file *filep,
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char __user *buf,
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size_t count,
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@ -118,6 +138,7 @@ static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
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static const struct file_operations iio_event_chrdev_fileops = {
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.read = iio_event_chrdev_read,
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.poll = iio_event_poll,
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.release = iio_event_chrdev_release,
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.owner = THIS_MODULE,
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.llseek = noop_llseek,
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