0088-sysfs.c.patch

--- /home/rossierd/soo/git/micofe/build/tmp/work/linux-6.12-r0/linux-6.12/soo/kernel/sysfs.c	1970-01-01 01:00:00.000000000 +0100
+++ ./soo/kernel/sysfs.c	2025-08-29 08:46:41.394665675 +0200
@@ -0,0 +1,158 @@
+
+/*
+ * Copyright (C) 2020 Daniel Rossier <daniel.rossier@heig-vd.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <linux/kobject.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+#include <soo/sysfs.h>
+
+#include <soo/uapi/console.h>
+
+/* Required to have a real string for each attribute. */
+char *soo_sysfs_names[] = {
+	[agencyUID] = "agencyUID",
+	[name] = "name",
+	[vsensej_js]= "vsensej_js",
+};
+
+static struct kobject *root_kobj;
+
+static struct kobject *backend_kobj;
+static struct kobject *backend_vsensej_kobj;
+
+
+/* Internal list structure to manage the diversity of callback functions related to attributes */
+typedef struct {
+	soo_sysfs_attr_t attr;
+	sysfs_handler_t show_handler, store_handler;
+	struct list_head list;
+} handler_list_t;
+
+static struct list_head handlers;
+
+void soo_sysfs_register(soo_sysfs_attr_t attr, sysfs_handler_t show_handler, sysfs_handler_t store_handler) {
+	handler_list_t *handler;
+
+	handler = kmalloc(sizeof(handler_list_t), GFP_ATOMIC);
+	BUG_ON(!handler);
+
+	handler->attr = attr;
+	handler->show_handler = show_handler;
+	handler->store_handler = store_handler;
+
+	list_add(&handler->list, &handlers);
+}
+
+static ssize_t	attr_show(struct kobject *kobj, struct kobj_attribute *attr, char *str) {
+	handler_list_t *handler;
+
+	list_for_each_entry(handler, &handlers, list) {
+
+		if (!strcmp(attr->attr.name, soo_sysfs_names[handler->attr])) {
+			if (handler->show_handler) {
+				handler->show_handler(str);
+
+				return strlen(str);
+			}
+		}
+	}
+
+	return 0;
+}
+
+
+static ssize_t	attr_store(struct kobject *kobj, struct kobj_attribute *attr, const char *str, size_t len) {
+	handler_list_t *handler;
+
+	list_for_each_entry(handler, &handlers, list) {
+
+		if (!strcmp(attr->attr.name, soo_sysfs_names[handler->attr])) {
+			if (handler->store_handler)
+				handler->store_handler((char *) str);
+		}
+	}
+
+	return len;
+}
+
+/***** Attributes declaration *****/
+
+/* SOO */
+static struct kobj_attribute agencyUID_attr = __ATTR(agencyUID, 0664, attr_show, attr_store);
+static struct kobj_attribute name_attr = __ATTR(name, 0664, attr_show, attr_store);
+
+/** Backends **/
+
+/**** vsensej ****/
+static struct kobj_attribute vsensej_js_attr = __ATTR(vsensej_js, 0664, attr_show, attr_store);
+
+
+/* Groups of attributes for SOO (root) */
+static struct attribute *soo_attrs[] = {
+	&agencyUID_attr.attr,
+	&name_attr.attr,
+	NULL,	/* need to NULL terminate the list of attributes */
+};
+
+static struct attribute_group soo_group = {
+	.attrs = soo_attrs,
+};
+
+
+/* Group of attributes for Backends */
+static struct attribute *backend_vsensej_attrs[] = {
+	&vsensej_js_attr.attr,
+	NULL,	/* need to NULL terminate the list of attributes */
+};
+
+static struct attribute_group backend_vsensej_group = {
+	.attrs = backend_vsensej_attrs,
+};
+
+void soo_sysfs_init(void) {
+        int ret;
+
+        INIT_LIST_HEAD(&handlers);
+        
+        /* Create the entry in /sys to access the information
+         * which will be exposed to the user space.
+         */
+
+	/* SOO root */
+        root_kobj = kobject_create_and_add("soo", NULL);
+	BUG_ON(!root_kobj);
+
+	ret = sysfs_create_group(root_kobj, &soo_group);
+	BUG_ON(ret);
+
+	/** Backends **/
+	backend_kobj = kobject_create_and_add("backend", root_kobj);
+	BUG_ON(!backend_kobj);
+
+	/**** vsensej ****/
+	backend_vsensej_kobj = kobject_create_and_add("vsensej", backend_kobj);
+	BUG_ON(!backend_vsensej_kobj);
+
+	ret = sysfs_create_group(backend_vsensej_kobj, &backend_vsensej_group);
+	BUG_ON(ret);
+}
+
+