[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/w1/w1_family.c b/src/kernel/linux/v4.14/drivers/w1/w1_family.c
new file mode 100644
index 0000000..f14ab0b
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/w1/w1_family.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/sched/signal.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+
+#include "w1_internal.h"
+
+DEFINE_SPINLOCK(w1_flock);
+static LIST_HEAD(w1_families);
+
+/**
+ * w1_register_family() - register a device family driver
+ * @newf: family to register
+ */
+int w1_register_family(struct w1_family *newf)
+{
+ struct list_head *ent, *n;
+ struct w1_family *f;
+ int ret = 0;
+
+ spin_lock(&w1_flock);
+ list_for_each_safe(ent, n, &w1_families) {
+ f = list_entry(ent, struct w1_family, family_entry);
+
+ if (f->fid == newf->fid) {
+ ret = -EEXIST;
+ break;
+ }
+ }
+
+ if (!ret) {
+ atomic_set(&newf->refcnt, 0);
+ list_add_tail(&newf->family_entry, &w1_families);
+ }
+ spin_unlock(&w1_flock);
+
+ /* check default devices against the new set of drivers */
+ w1_reconnect_slaves(newf, 1);
+
+ return ret;
+}
+EXPORT_SYMBOL(w1_register_family);
+
+/**
+ * w1_unregister_family() - unregister a device family driver
+ * @fent: family to unregister
+ */
+void w1_unregister_family(struct w1_family *fent)
+{
+ struct list_head *ent, *n;
+ struct w1_family *f;
+
+ spin_lock(&w1_flock);
+ list_for_each_safe(ent, n, &w1_families) {
+ f = list_entry(ent, struct w1_family, family_entry);
+
+ if (f->fid == fent->fid) {
+ list_del(&fent->family_entry);
+ break;
+ }
+ }
+ spin_unlock(&w1_flock);
+
+ /* deatch devices using this family code */
+ w1_reconnect_slaves(fent, 0);
+
+ while (atomic_read(&fent->refcnt)) {
+ pr_info("Waiting for family %u to become free: refcnt=%d.\n",
+ fent->fid, atomic_read(&fent->refcnt));
+
+ if (msleep_interruptible(1000))
+ flush_signals(current);
+ }
+}
+EXPORT_SYMBOL(w1_unregister_family);
+
+/*
+ * Should be called under w1_flock held.
+ */
+struct w1_family * w1_family_registered(u8 fid)
+{
+ struct list_head *ent, *n;
+ struct w1_family *f = NULL;
+ int ret = 0;
+
+ list_for_each_safe(ent, n, &w1_families) {
+ f = list_entry(ent, struct w1_family, family_entry);
+
+ if (f->fid == fid) {
+ ret = 1;
+ break;
+ }
+ }
+
+ return (ret) ? f : NULL;
+}
+
+static void __w1_family_put(struct w1_family *f)
+{
+ atomic_dec(&f->refcnt);
+}
+
+void w1_family_put(struct w1_family *f)
+{
+ spin_lock(&w1_flock);
+ __w1_family_put(f);
+ spin_unlock(&w1_flock);
+}
+
+#if 0
+void w1_family_get(struct w1_family *f)
+{
+ spin_lock(&w1_flock);
+ __w1_family_get(f);
+ spin_unlock(&w1_flock);
+}
+#endif /* 0 */
+
+void __w1_family_get(struct w1_family *f)
+{
+ smp_mb__before_atomic();
+ atomic_inc(&f->refcnt);
+ smp_mb__after_atomic();
+}