staging:iio: remove legacy event chrdev for the buffers

part of sca3000 driver temporarily disabled (buffer won't run
anyway).  This section is replaced later in this patch set.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/accel/sca3000_ring.c

@@ -357,11 +357,13 @@ 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_ring_event(ring,
 				    IIO_EVENT_CODE_RING_75_FULL,
 				    0);
 	else if (val & SCA3000_INT_STATUS_HALF)
 		iio_push_ring_event(ring,
 				    IIO_EVENT_CODE_RING_50_FULL, 0);
+	*/
 }

drivers/staging/iio/iio.h

@@ -399,20 +399,6 @@ int __iio_push_event(struct iio_event_interface *ev_int,
 		     int ev_code,
 		     s64 timestamp);
 
-/**
- * iio_setup_ev_int() - configure an event interface (chrdev)
- * @name:		name used for resulting sysfs directory etc.
- * @ev_int:		interface we are configuring
- * @owner:		module that is responsible for registering this ev_int
- * @dev:		device whose ev_int this is
- **/
-int iio_setup_ev_int(struct iio_event_interface *ev_int,
-		     const char *name,
-		     struct module *owner,
-		     struct device *dev);
-
-void iio_free_ev_int(struct iio_event_interface *ev_int);
-
 /**
  * iio_allocate_chrdev() - Allocate a chrdev
  * @handler:	struct that contains relevant file handling for chrdev

drivers/staging/iio/industrialio-core.c

@@ -393,7 +393,7 @@ void iio_device_free_chrdev_minor(int val)
 	spin_unlock(&iio_ida_lock);
 }
 
-int iio_setup_ev_int(struct iio_event_interface *ev_int,
+static int iio_setup_ev_int(struct iio_event_interface *ev_int,
 		     const char *name,
 		     struct module *owner,
 		     struct device *dev)
@@ -445,7 +445,7 @@ int iio_setup_ev_int(struct iio_event_interface *ev_int,
 	return ret;
 }
 
-void iio_free_ev_int(struct iio_event_interface *ev_int)
+static void iio_free_ev_int(struct iio_event_interface *ev_int)
 {
 	device_unregister(&ev_int->dev);
 	put_device(&ev_int->dev);

drivers/staging/iio/industrialio-ring.c

@@ -23,16 +23,6 @@
 #include "iio.h"
 #include "ring_generic.h"
 
-int iio_push_ring_event(struct iio_ring_buffer *ring_buf,
-		       int event_code,
-		       s64 timestamp)
-{
-	return __iio_push_event(&ring_buf->ev_int,
-				event_code,
-				timestamp);
-}
-EXPORT_SYMBOL(iio_push_ring_event);
-
 /**
  * iio_ring_open() - chrdev file open for ring buffer access
  *
@@ -116,43 +106,6 @@ static const struct file_operations iio_ring_fileops = {
 	.llseek = noop_llseek,
 };
 
-/**
- * __iio_request_ring_buffer_event_chrdev() - allocate ring event chrdev
- * @buf:	ring buffer whose event chrdev we are allocating
- * @id:		id of this ring buffer (typically 0)
- * @owner:	the module who owns the ring buffer (for ref counting)
- * @dev:	device with which the chrdev is associated
- **/
-static inline int
-__iio_request_ring_buffer_event_chrdev(struct iio_ring_buffer *buf,
-				       int id,
-				       struct module *owner,
-				       struct device *dev)
-{
-	int ret;
-
-	snprintf(buf->ev_int._name, sizeof(buf->ev_int._name),
-		 "%s:event%d",
-		 dev_name(&buf->dev),
-		 id);
-	ret = iio_setup_ev_int(&(buf->ev_int),
-			       buf->ev_int._name,
-			       owner,
-			       dev);
-	if (ret)
-		goto error_ret;
-	return 0;
-
-error_ret:
-	return ret;
-}
-
-static inline void
-__iio_free_ring_buffer_event_chrdev(struct iio_ring_buffer *buf)
-{
-	iio_free_ev_int(&(buf->ev_int));
-}
-
 static void iio_ring_access_release(struct device *dev)
 {
 	struct iio_ring_buffer *buf
@@ -227,7 +180,6 @@ void iio_ring_buffer_init(struct iio_ring_buffer *ring,
 	if (ring->access.mark_param_change)
 		ring->access.mark_param_change(ring);
 	ring->indio_dev = dev_info;
-	ring->ev_int.private = ring;
 	ring->access_handler.private = ring;
 	init_waitqueue_head(&ring->pollq);
 }
@@ -399,19 +351,12 @@ int iio_ring_buffer_register_ex(struct iio_ring_buffer *ring, int id,
 	if (ret)
 		goto error_ret;
 
-	ret = __iio_request_ring_buffer_event_chrdev(ring,
-						     0,
-						     ring->owner,
-						     &ring->dev);
-	if (ret)
-		goto error_remove_device;
-
 	ret = __iio_request_ring_buffer_access_chrdev(ring,
 						      0,
 						      ring->owner);
 
 	if (ret)
-		goto error_ret;
+		goto error_remove_device;
 
 	if (ring->scan_el_attrs) {
 		ret = sysfs_create_group(&ring->dev.kobj,
@@ -462,7 +407,6 @@ void iio_ring_buffer_unregister(struct iio_ring_buffer *ring)
 {
 	__iio_ring_attr_cleanup(ring);
 	__iio_free_ring_buffer_access_chrdev(ring);
-	__iio_free_ring_buffer_event_chrdev(ring);
 	device_del(&ring->dev);
 }
 EXPORT_SYMBOL(iio_ring_buffer_unregister);

drivers/staging/iio/ring_generic.h

@@ -15,29 +15,6 @@
 
 struct iio_ring_buffer;
 
-/**
- * iio_push_ring_event() - ring buffer specific push to event chrdev
- * @ring_buf:		ring buffer that is the event source
- * @event_code:		event indentification code
- * @timestamp:		time of event
- **/
-int iio_push_ring_event(struct iio_ring_buffer *ring_buf,
-			int event_code,
-			s64 timestamp);
-/**
- * iio_push_or_escallate_ring_event() -	escalate or add as appropriate
- * @ring_buf:		ring buffer that is the event source
- * @event_code:		event indentification code
- * @timestamp:		time of event
- *
- * Typical usecase is to escalate a 50% ring full to 75% full if no one has yet
- * read the first event. Clearly the 50% full is no longer of interest in
- * typical use case.
- **/
-int iio_push_or_escallate_ring_event(struct iio_ring_buffer *ring_buf,
-				     int event_code,
-				     s64 timestamp);
-
 /**
  * struct iio_ring_access_funcs - access functions for ring buffers.
  * @mark_in_use:	reference counting, typically to prevent module removal
@@ -106,7 +83,6 @@ struct iio_ring_access_funcs {
  * @scan_mask:		[INTERN] bitmask used in masking scan mode elements
  * @scan_timestamp:	[INTERN] does the scan mode include a timestamp
  * @access_handler:	[INTERN] chrdev access handling
- * @ev_int:		[INTERN] chrdev interface for the event chrdev
  * @access:		[DRIVER] ring access functions associated with the
  *			implementation.
  * @preenable:		[DRIVER] function to run prior to marking ring enabled
@@ -130,7 +106,6 @@ struct iio_ring_buffer {
 	u32				scan_mask;
 	bool				scan_timestamp;
 	struct iio_handler		access_handler;
-	struct iio_event_interface	ev_int;
 	struct iio_ring_access_funcs	access;
 	int				(*preenable)(struct iio_dev *);
 	int				(*postenable)(struct iio_dev *);

drivers/staging/iio/ring_sw.c

@@ -69,7 +69,6 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 				unsigned char *data, s64 timestamp)
 {
 	int ret = 0;
-	int code;
 	unsigned char *temp_ptr, *change_test_ptr;
 
 	/* initial store */
@@ -133,10 +132,6 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 	if (ring->half_p == ring->data + ring->buf.length*ring->buf.bytes_per_datum)
 		ring->half_p = ring->data;
 	if (ring->half_p == ring->read_p) {
-		code = IIO_EVENT_CODE_RING_50_FULL;
-		ret = __iio_push_event(&ring->buf.ev_int,
-				       code,
-				       timestamp);
 		ring->buf.stufftoread = true;
 		wake_up_interruptible(&ring->buf.pollq);
 	}