1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/staging/csr/oska/refcount.c b/drivers/staging/csr/oska/refcount.c
new file mode 100644
index 000000000000..28abb64a9d20
--- /dev/null
+++ b/drivers/staging/csr/oska/refcount.c
@@ -0,0 +1,47 @@
+/*
+ * OSKA generic implementation -- reference counting.
+ *
+ * Copyright (C) 2010 Cambridge Silicon Radio Ltd.
+ *
+ * Refer to LICENSE.txt included with this source code for details on
+ * the license terms.
+ */
+#include "refcount.h"
+#include "types.h"
+
+void os_refcount_init(os_refcount_t *refcount, os_refcount_callback_f func, void *arg)
+{
+    os_spinlock_init(&refcount->lock);
+    refcount->count = 1;
+    refcount->func  = func;
+    refcount->arg   = arg;
+}
+
+void os_refcount_destroy(os_refcount_t *refcount)
+{
+    os_spinlock_destroy(&refcount->lock);
+}
+
+void os_refcount_get(os_refcount_t *refcount)
+{
+    os_int_status_t istate;
+
+    os_spinlock_lock_intsave(&refcount->lock, &istate);
+    refcount->count++;
+    os_spinlock_unlock_intrestore(&refcount->lock, &istate);
+}
+
+void os_refcount_put(os_refcount_t *refcount)
+{
+    bool is_zero;
+    os_int_status_t istate;
+
+    os_spinlock_lock_intsave(&refcount->lock, &istate);
+    refcount->count--;
+    is_zero = refcount->count == 0;
+    os_spinlock_unlock_intrestore(&refcount->lock, &istate);
+
+    if (is_zero) {
+        refcount->func(refcount->arg);
+    }
+}