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From:   Alexandru Ardelean <alexandru.ardelean@analog.com>
To:     <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     <jic23@kernel.org>, <lars@metafoo.de>, <pmeerw@pmeerw.net>,
        <knaack.h@gmx.de>,
        Alexandru Ardelean <alexandru.ardelean@analog.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH v4 7/7] iio: core: move event interface on the opaque struct
Date:   Tue, 30 Jun 2020 07:57:08 +0300
Message-ID: <20200630045708.14166-8-alexandru.ardelean@analog.com>
In-Reply-To: <20200630045708.14166-1-alexandru.ardelean@analog.com>
References: <20200630045708.14166-1-alexandru.ardelean@analog.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Same as with other private fields, this moves the event interface reference
to the opaque IIO device object, to be invisible to drivers.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/industrialio-core.c  |  5 ++-
 drivers/iio/industrialio-event.c | 68 +++++++++++++++++++-------------
 include/linux/iio/iio-opaque.h   |  2 +
 include/linux/iio/iio.h          |  3 --
 4 files changed, 45 insertions(+), 33 deletions(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 461a4e7f48d7..a0ad152c82a7 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -211,7 +211,8 @@ EXPORT_SYMBOL(iio_read_const_attr);
 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
 {
 	int ret;
-	const struct iio_event_interface *ev_int = indio_dev->event_interface;
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+	const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
 
 	ret = mutex_lock_interruptible(&indio_dev->mlock);
 	if (ret)
@@ -1442,7 +1443,7 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
 			attrcount += ret;
 		}
 
-	if (indio_dev->event_interface)
+	if (iio_dev_opaque->event_interface)
 		clk = &dev_attr_current_timestamp_clock.attr;
 
 	if (indio_dev->name)
diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 5b17c92d3b50..2ab4d4c44427 100644
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -18,6 +18,7 @@
 #include <linux/uaccess.h>
 #include <linux/wait.h>
 #include <linux/iio/iio.h>
+#include <linux/iio/iio-opaque.h>
 #include "iio_core.h"
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
@@ -62,7 +63,8 @@ bool iio_event_enabled(const struct iio_event_interface *ev_int)
  **/
 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
 {
-	struct iio_event_interface *ev_int = indio_dev->event_interface;
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
 	struct iio_event_data ev;
 	int copied;
 
@@ -96,7 +98,8 @@ static __poll_t iio_event_poll(struct file *filep,
 			     struct poll_table_struct *wait)
 {
 	struct iio_dev *indio_dev = filep->private_data;
-	struct iio_event_interface *ev_int = indio_dev->event_interface;
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
 	__poll_t events = 0;
 
 	if (!indio_dev->info)
@@ -116,7 +119,8 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
 				     loff_t *f_ps)
 {
 	struct iio_dev *indio_dev = filep->private_data;
-	struct iio_event_interface *ev_int = indio_dev->event_interface;
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
 	unsigned int copied;
 	int ret;
 
@@ -165,7 +169,8 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
 static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
 {
 	struct iio_dev *indio_dev = filep->private_data;
-	struct iio_event_interface *ev_int = indio_dev->event_interface;
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
 
 	clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
 
@@ -184,7 +189,8 @@ static const struct file_operations iio_event_chrdev_fileops = {
 
 int iio_event_getfd(struct iio_dev *indio_dev)
 {
-	struct iio_event_interface *ev_int = indio_dev->event_interface;
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
 	int fd;
 
 	if (ev_int == NULL)
@@ -343,6 +349,7 @@ static int iio_device_add_event(struct iio_dev *indio_dev,
 	enum iio_event_type type, enum iio_event_direction dir,
 	enum iio_shared_by shared_by, const unsigned long *mask)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	ssize_t (*show)(struct device *, struct device_attribute *, char *);
 	ssize_t (*store)(struct device *, struct device_attribute *,
 		const char *, size_t);
@@ -376,7 +383,7 @@ static int iio_device_add_event(struct iio_dev *indio_dev,
 
 		ret = __iio_add_chan_devattr(postfix, chan, show, store,
 			 (i << 16) | spec_index, shared_by, &indio_dev->dev,
-			&indio_dev->event_interface->dev_attr_list);
+			&iio_dev_opaque->event_interface->dev_attr_list);
 		kfree(postfix);
 
 		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
@@ -469,6 +476,7 @@ static void iio_setup_ev_int(struct iio_event_interface *ev_int)
 static const char *iio_event_group_name = "events";
 int iio_device_register_eventset(struct iio_dev *indio_dev)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	struct iio_dev_attr *p;
 	int ret = 0, attrcount_orig = 0, attrcount, attrn;
 	struct attribute **attr;
@@ -477,14 +485,14 @@ int iio_device_register_eventset(struct iio_dev *indio_dev)
 	      iio_check_for_dynamic_events(indio_dev)))
 		return 0;
 
-	indio_dev->event_interface =
+	iio_dev_opaque->event_interface =
 		kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
-	if (indio_dev->event_interface == NULL)
+	if (iio_dev_opaque->event_interface == NULL)
 		return -ENOMEM;
 
-	INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
+	INIT_LIST_HEAD(&iio_dev_opaque->event_interface->dev_attr_list);
 
-	iio_setup_ev_int(indio_dev->event_interface);
+	iio_setup_ev_int(iio_dev_opaque->event_interface);
 	if (indio_dev->info->event_attrs != NULL) {
 		attr = indio_dev->info->event_attrs->attrs;
 		while (*attr++ != NULL)
@@ -498,35 +506,35 @@ int iio_device_register_eventset(struct iio_dev *indio_dev)
 		attrcount += ret;
 	}
 
-	indio_dev->event_interface->group.name = iio_event_group_name;
-	indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
-							  sizeof(indio_dev->event_interface->group.attrs[0]),
+	iio_dev_opaque->event_interface->group.name = iio_event_group_name;
+	iio_dev_opaque->event_interface->group.attrs = kcalloc(attrcount + 1,
+							  sizeof(iio_dev_opaque->event_interface->group.attrs[0]),
 							  GFP_KERNEL);
-	if (indio_dev->event_interface->group.attrs == NULL) {
+	if (iio_dev_opaque->event_interface->group.attrs == NULL) {
 		ret = -ENOMEM;
 		goto error_free_setup_event_lines;
 	}
 	if (indio_dev->info->event_attrs)
-		memcpy(indio_dev->event_interface->group.attrs,
+		memcpy(iio_dev_opaque->event_interface->group.attrs,
 		       indio_dev->info->event_attrs->attrs,
-		       sizeof(indio_dev->event_interface->group.attrs[0])
+		       sizeof(iio_dev_opaque->event_interface->group.attrs[0])
 		       *attrcount_orig);
 	attrn = attrcount_orig;
 	/* Add all elements from the list. */
 	list_for_each_entry(p,
-			    &indio_dev->event_interface->dev_attr_list,
+			    &iio_dev_opaque->event_interface->dev_attr_list,
 			    l)
-		indio_dev->event_interface->group.attrs[attrn++] =
+		iio_dev_opaque->event_interface->group.attrs[attrn++] =
 			&p->dev_attr.attr;
 	indio_dev->groups[indio_dev->groupcounter++] =
-		&indio_dev->event_interface->group;
+		&iio_dev_opaque->event_interface->group;
 
 	return 0;
 
 error_free_setup_event_lines:
-	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
-	kfree(indio_dev->event_interface);
-	indio_dev->event_interface = NULL;
+	iio_free_chan_devattr_list(&iio_dev_opaque->event_interface->dev_attr_list);
+	kfree(iio_dev_opaque->event_interface);
+	iio_dev_opaque->event_interface = NULL;
 	return ret;
 }
 
@@ -539,16 +547,20 @@ int iio_device_register_eventset(struct iio_dev *indio_dev)
  */
 void iio_device_wakeup_eventset(struct iio_dev *indio_dev)
 {
-	if (indio_dev->event_interface == NULL)
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
+	if (iio_dev_opaque->event_interface == NULL)
 		return;
-	wake_up(&indio_dev->event_interface->wait);
+	wake_up(&iio_dev_opaque->event_interface->wait);
 }
 
 void iio_device_unregister_eventset(struct iio_dev *indio_dev)
 {
-	if (indio_dev->event_interface == NULL)
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
+	if (iio_dev_opaque->event_interface == NULL)
 		return;
-	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
-	kfree(indio_dev->event_interface->group.attrs);
-	kfree(indio_dev->event_interface);
+	iio_free_chan_devattr_list(&iio_dev_opaque->event_interface->dev_attr_list);
+	kfree(iio_dev_opaque->event_interface->group.attrs);
+	kfree(iio_dev_opaque->event_interface);
 }
diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h
index af6c69a40169..f2e94196d31f 100644
--- a/include/linux/iio/iio-opaque.h
+++ b/include/linux/iio/iio-opaque.h
@@ -6,6 +6,7 @@
 /**
  * struct iio_dev_opaque - industrial I/O device opaque information
  * @indio_dev:			public industrial I/O device information
+ * @event_interface:		event chrdevs associated with interrupt lines
  * @buffer_list:		list of all buffers currently attached
  * @channel_attr_list:		keep track of automatically created channel
  *				attributes
@@ -17,6 +18,7 @@
  */
 struct iio_dev_opaque {
 	struct iio_dev			indio_dev;
+	struct iio_event_interface	*event_interface;
 	struct list_head		buffer_list;
 	struct list_head		channel_attr_list;
 	struct attribute_group		chan_attr_group;
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 219847f6f5c6..e2df67a3b9ab 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -488,7 +488,6 @@ struct iio_buffer_setup_ops {
  * @currentmode:	[DRIVER] current operating mode
  * @dev:		[DRIVER] device structure, should be assigned a parent
  *			and owner
- * @event_interface:	[INTERN] event chrdevs associated with interrupt lines
  * @buffer:		[DRIVER] any buffer present
  * @scan_bytes:		[INTERN] num bytes captured to be fed to buffer demux
  * @mlock:		[INTERN] lock used to prevent simultaneous device state
@@ -527,8 +526,6 @@ struct iio_dev {
 	int				currentmode;
 	struct device			dev;
 
-	struct iio_event_interface	*event_interface;
-
 	struct iio_buffer		*buffer;
 	int				scan_bytes;
 	struct mutex			mlock;
-- 
2.17.1