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Commit 939606d5 authored by Jonathan Cameron's avatar Jonathan Cameron Committed by Greg Kroah-Hartman
Browse files

staging:iio: remove ability to escalate events. 



Whilst it is possible to output events to say buffers have passed
a particular level there are no obvious reasons to actually do so.

The upshot of this patch is that buffers will only ever have
one threshold turned on at a time.

For now sca3000 has it's ring buffer effectively disabled.
Fixed later in series.

Signed-off-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 298cd976

drivers/staging/iio/accel/sca3000_ring.c

+9 −4
Original line number Diff line number Diff line
@@ -45,9 +45,12 @@ 
 * Currently does not provide timestamps.  As the hardware doesn't add them they

 * can only be inferred approximately from ring buffer events such as 50% full

 * and knowledge of when buffer was last emptied.  This is left to userspace.

 *

 * Temporarily deliberately broken.

 **/

static int sca3000_read_first_n_hw_rb(struct iio_ring_buffer *r,

				      size_t count, u8 **data, int *dead_offset)

				      size_t count, char __user *buf,

				      int *dead_offset)

{

	struct iio_hw_ring_buffer *hw_ring = iio_to_hw_ring_buf(r);

	struct iio_dev *indio_dev = hw_ring->private;
@@ -56,6 +59,8 @@ static int sca3000_read_first_n_hw_rb(struct iio_ring_buffer *r, 
	s16 *samples;

	int ret, i, num_available, num_read = 0;

	int bytes_per_sample = 1;

	u8 *datas;

	u8 **data = &datas;



	if (st->bpse == 11)

		bytes_per_sample = 2;
@@ -353,7 +358,7 @@ void sca3000_register_ring_funcs(struct iio_dev *indio_dev) 
void sca3000_ring_int_process(u8 val, struct iio_ring_buffer *ring)

{

	if (val & SCA3000_INT_STATUS_THREE_QUARTERS)

		iio_push_or_escallate_ring_event(ring,

		iio_push_ring_event(ring,

				    IIO_EVENT_CODE_RING_75_FULL,

				    0);

	else if (val & SCA3000_INT_STATUS_HALF)

drivers/staging/iio/chrdev.h

+0 −13
Original line number Diff line number Diff line
@@ -45,23 +45,10 @@ struct iio_event_data { 
 * struct iio_detected_event_list - list element for events that have occurred

 * @list:		linked list header

 * @ev:			the event itself

 * @shared_pointer:	used when the event is shared - i.e. can be escallated

 *			on demand (eg ring buffer 50%->100% full)

 */

struct iio_detected_event_list {

	struct list_head		list;

	struct iio_event_data		ev;

	struct iio_shared_ev_pointer	*shared_pointer;

};

/**

 * struct iio_shared_ev_pointer - allows shared events to identify if currently

 *				in the detected event list

 * @ev_p:	pointer to detected event list element (null if not in list)

 * @lock:	protect this element to prevent simultaneous edit and remove

 */

struct iio_shared_ev_pointer {

	struct iio_detected_event_list	*ev_p;

	spinlock_t			lock;

};



/**

drivers/staging/iio/iio.h

+2 −14
Original line number Diff line number Diff line
@@ -394,20 +394,8 @@ int iio_push_event(struct iio_dev *dev_info, 
 * @ev_int:		the event interface to which we are pushing the event

 * @ev_code:		the outgoing event code

 * @timestamp:		timestamp of the event

 * @shared_pointer_p:	the shared event pointer

 **/

int __iio_push_event(struct iio_event_interface *ev_int,

		    int ev_code,

		    s64 timestamp,

		    struct iio_shared_ev_pointer*

		    shared_pointer_p);

/**

 * __iio_change_event() - change an event code in case of event escalation

 * @ev:			the event to be changed

 * @ev_code:		new event code

 * @timestamp:		new timestamp

 **/

void __iio_change_event(struct iio_detected_event_list *ev,

		     int ev_code,

		     s64 timestamp);

drivers/staging/iio/industrialio-core.c

+2 −28
Original line number Diff line number Diff line
@@ -82,15 +82,6 @@ static const char * const iio_chan_info_postfix[] = { 
	[IIO_CHAN_INFO_CALIBBIAS_SHARED/2] = "calibbias",

};



void __iio_change_event(struct iio_detected_event_list *ev,

			int ev_code,

			s64 timestamp)

{

	ev->ev.id = ev_code;

	ev->ev.timestamp = timestamp;

}

EXPORT_SYMBOL(__iio_change_event);



/* Used both in the interrupt line put events and the ring buffer ones */



/* Note that in it's current form someone has to be listening before events
@@ -99,9 +90,7 @@ EXPORT_SYMBOL(__iio_change_event); 
 */

int __iio_push_event(struct iio_event_interface *ev_int,

		     int ev_code,

		     s64 timestamp,

		     struct iio_shared_ev_pointer *

		     shared_pointer_p)

		     s64 timestamp)

{

	struct iio_detected_event_list *ev;

	int ret = 0;
@@ -121,9 +110,6 @@ int __iio_push_event(struct iio_event_interface *ev_int, 
		}

		ev->ev.id = ev_code;

		ev->ev.timestamp = timestamp;

		ev->shared_pointer = shared_pointer_p;

		if (ev->shared_pointer)

			shared_pointer_p->ev_p = ev;



		list_add_tail(&ev->list, &ev_int->det_events.list);

		ev_int->current_events++;
@@ -143,7 +129,7 @@ int iio_push_event(struct iio_dev *dev_info, 
		   s64 timestamp)

{

	return __iio_push_event(&dev_info->event_interfaces[ev_line],

				ev_code, timestamp, NULL);

				ev_code, timestamp);

}

EXPORT_SYMBOL(iio_push_event);
@@ -311,18 +297,6 @@ static ssize_t iio_event_chrdev_read(struct file *filep, 
	list_del(&el->list);

	ev_int->current_events--;

	mutex_unlock(&ev_int->event_list_lock);

	/*

	 * Possible concurency issue if an update of this event is on its way

	 * through. May lead to new event being removed whilst the reported

	 * event was the unescalated event. In typical use case this is not a

	 * problem as userspace will say read half the buffer due to a 50%

	 * full event which would make the correct 100% full incorrect anyway.

	 */

	if (el->shared_pointer) {

		spin_lock(&el->shared_pointer->lock);

		(el->shared_pointer->ev_p) = NULL;

		spin_unlock(&el->shared_pointer->lock);

	}

	kfree(el);



	return len;

drivers/staging/iio/industrialio-ring.c

+2 −21
Original line number Diff line number Diff line
@@ -27,27 +27,10 @@ int iio_push_ring_event(struct iio_ring_buffer *ring_buf, 
		       s64 timestamp)

{

	return __iio_push_event(&ring_buf->ev_int,

			       event_code,

			       timestamp,

			       &ring_buf->shared_ev_pointer);

}

EXPORT_SYMBOL(iio_push_ring_event);



int iio_push_or_escallate_ring_event(struct iio_ring_buffer *ring_buf,

				    int event_code,

				    s64 timestamp)

{

	if (ring_buf->shared_ev_pointer.ev_p)

		__iio_change_event(ring_buf->shared_ev_pointer.ev_p,

				   event_code,

				   timestamp);

	else

		return iio_push_ring_event(ring_buf,

				event_code,

				timestamp);

	return 0;

}

EXPORT_SYMBOL(iio_push_or_escallate_ring_event);

EXPORT_SYMBOL(iio_push_ring_event);



/**

 * iio_ring_open() - chrdev file open for ring buffer access
@@ -228,8 +211,6 @@ void iio_ring_buffer_init(struct iio_ring_buffer *ring, 
	ring->indio_dev = dev_info;

	ring->ev_int.private = ring;

	ring->access_handler.private = ring;

	ring->shared_ev_pointer.ev_p = NULL;

	spin_lock_init(&ring->shared_ev_pointer.lock);

}

EXPORT_SYMBOL(iio_ring_buffer_init);