add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/iio/industrialio-event.c
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@@ -1,10 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* Industrial I/O event handling
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  *
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  * Copyright (c) 2008 Jonathan Cameron
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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  *
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  * Based on elements of hwmon and input subsystems.
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  */
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@@ -21,6 +18,7 @@
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 #include <linux/uaccess.h>
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 #include <linux/wait.h>
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 #include <linux/iio/iio.h>
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+#include <linux/iio/iio-opaque.h>
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 #include "iio_core.h"
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 #include <linux/iio/sysfs.h>
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 #include <linux/iio/events.h>
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@@ -65,7 +63,8 @@
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  **/
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 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
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 {
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-	struct iio_event_interface *ev_int = indio_dev->event_interface;
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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 	struct iio_event_data ev;
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 	int copied;
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@@ -99,7 +98,8 @@
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 			     struct poll_table_struct *wait)
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 {
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 	struct iio_dev *indio_dev = filep->private_data;
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-	struct iio_event_interface *ev_int = indio_dev->event_interface;
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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 	__poll_t events = 0;
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 	if (!indio_dev->info)
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@@ -119,7 +119,8 @@
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 				     loff_t *f_ps)
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 {
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 	struct iio_dev *indio_dev = filep->private_data;
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-	struct iio_event_interface *ev_int = indio_dev->event_interface;
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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 	unsigned int copied;
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 	int ret;
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@@ -168,7 +169,8 @@
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 static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
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 {
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 	struct iio_dev *indio_dev = filep->private_data;
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-	struct iio_event_interface *ev_int = indio_dev->event_interface;
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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 	clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
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@@ -187,7 +189,8 @@
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 int iio_event_getfd(struct iio_dev *indio_dev)
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 {
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-	struct iio_event_interface *ev_int = indio_dev->event_interface;
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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 	int fd;
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 	if (ev_int == NULL)
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@@ -225,12 +228,19 @@
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 	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
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 	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
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 	[IIO_EV_TYPE_CHANGE] = "change",
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+#ifdef CONFIG_NO_GKI
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+	[IIO_EV_TYPE_FIFO_FLUSH] = "fifo_flush",
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+#endif
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 };
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 static const char * const iio_ev_dir_text[] = {
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 	[IIO_EV_DIR_EITHER] = "either",
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 	[IIO_EV_DIR_RISING] = "rising",
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-	[IIO_EV_DIR_FALLING] = "falling"
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+	[IIO_EV_DIR_FALLING] = "falling",
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+#ifdef CONFIG_NO_GKI
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+	[IIO_EV_DIR_FIFO_EMPTY] = "empty",
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+	[IIO_EV_DIR_FIFO_DATA] = "data",
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+#endif
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 };
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 static const char * const iio_ev_info_text[] = {
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@@ -346,6 +356,7 @@
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 	enum iio_event_type type, enum iio_event_direction dir,
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 	enum iio_shared_by shared_by, const unsigned long *mask)
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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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 	ssize_t (*show)(struct device *, struct device_attribute *, char *);
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 	ssize_t (*store)(struct device *, struct device_attribute *,
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 		const char *, size_t);
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@@ -379,7 +390,7 @@
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 		ret = __iio_add_chan_devattr(postfix, chan, show, store,
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 			 (i << 16) | spec_index, shared_by, &indio_dev->dev,
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-			&indio_dev->event_interface->dev_attr_list);
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+			&iio_dev_opaque->event_interface->dev_attr_list);
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 		kfree(postfix);
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 		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
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@@ -472,6 +483,8 @@
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 static const char *iio_event_group_name = "events";
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 int iio_device_register_eventset(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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+	struct iio_event_interface *ev_int;
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 	struct iio_dev_attr *p;
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 	int ret = 0, attrcount_orig = 0, attrcount, attrn;
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 	struct attribute **attr;
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@@ -480,14 +493,15 @@
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 	      iio_check_for_dynamic_events(indio_dev)))
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 		return 0;
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-	indio_dev->event_interface =
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-		kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
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-	if (indio_dev->event_interface == NULL)
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+	ev_int = kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
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+	if (ev_int == NULL)
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 		return -ENOMEM;
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-	INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
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+	iio_dev_opaque->event_interface = ev_int;
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-	iio_setup_ev_int(indio_dev->event_interface);
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+	INIT_LIST_HEAD(&ev_int->dev_attr_list);
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+
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+	iio_setup_ev_int(ev_int);
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 	if (indio_dev->info->event_attrs != NULL) {
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 		attr = indio_dev->info->event_attrs->attrs;
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 		while (*attr++ != NULL)
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@@ -501,35 +515,30 @@
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 		attrcount += ret;
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 	}
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-	indio_dev->event_interface->group.name = iio_event_group_name;
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-	indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
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-							  sizeof(indio_dev->event_interface->group.attrs[0]),
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-							  GFP_KERNEL);
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-	if (indio_dev->event_interface->group.attrs == NULL) {
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+	ev_int->group.name = iio_event_group_name;
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+	ev_int->group.attrs = kcalloc(attrcount + 1,
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+				      sizeof(ev_int->group.attrs[0]),
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+				      GFP_KERNEL);
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+	if (ev_int->group.attrs == NULL) {
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 		ret = -ENOMEM;
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 		goto error_free_setup_event_lines;
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 	}
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 	if (indio_dev->info->event_attrs)
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-		memcpy(indio_dev->event_interface->group.attrs,
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+		memcpy(ev_int->group.attrs,
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 		       indio_dev->info->event_attrs->attrs,
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-		       sizeof(indio_dev->event_interface->group.attrs[0])
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-		       *attrcount_orig);
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+		       sizeof(ev_int->group.attrs[0]) * attrcount_orig);
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 	attrn = attrcount_orig;
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 	/* Add all elements from the list. */
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-	list_for_each_entry(p,
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-			    &indio_dev->event_interface->dev_attr_list,
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-			    l)
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-		indio_dev->event_interface->group.attrs[attrn++] =
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-			&p->dev_attr.attr;
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-	indio_dev->groups[indio_dev->groupcounter++] =
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-		&indio_dev->event_interface->group;
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+	list_for_each_entry(p, &ev_int->dev_attr_list, l)
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+		ev_int->group.attrs[attrn++] = &p->dev_attr.attr;
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+	indio_dev->groups[indio_dev->groupcounter++] = &ev_int->group;
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 	return 0;
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 error_free_setup_event_lines:
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-	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
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-	kfree(indio_dev->event_interface);
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-	indio_dev->event_interface = NULL;
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+	iio_free_chan_devattr_list(&ev_int->dev_attr_list);
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+	kfree(ev_int);
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+	iio_dev_opaque->event_interface = NULL;
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 	return ret;
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 }
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@@ -542,16 +551,22 @@
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  */
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 void iio_device_wakeup_eventset(struct iio_dev *indio_dev)
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 {
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-	if (indio_dev->event_interface == NULL)
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+
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+	if (iio_dev_opaque->event_interface == NULL)
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 		return;
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-	wake_up(&indio_dev->event_interface->wait);
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+	wake_up(&iio_dev_opaque->event_interface->wait);
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 }
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 void iio_device_unregister_eventset(struct iio_dev *indio_dev)
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 {
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-	if (indio_dev->event_interface == NULL)
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+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
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+	struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
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+
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+	if (ev_int == NULL)
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 		return;
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-	iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
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-	kfree(indio_dev->event_interface->group.attrs);
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-	kfree(indio_dev->event_interface);
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+	iio_free_chan_devattr_list(&ev_int->dev_attr_list);
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+	kfree(ev_int->group.attrs);
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+	kfree(ev_int);
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+	iio_dev_opaque->event_interface = NULL;
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 }