mirror of https://github.com/hak5/openwrt.git
103 lines
3.4 KiB
Diff
103 lines
3.4 KiB
Diff
From f07f917faa2f85625277f4d2f5294a630a6b0fb1 Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Wed, 2 Jul 2008 22:37:58 +0100
|
|
Subject: [PATCH] introduce-resume-dependency.patch
|
|
|
|
Defines a way for drivers to defer execution of resume callbacks
|
|
until one or more other driver they are dependent on has itself
|
|
resumed.
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
include/linux/resume-dependency.h | 78 +++++++++++++++++++++++++++++++++++++
|
|
1 files changed, 78 insertions(+), 0 deletions(-)
|
|
create mode 100644 include/linux/resume-dependency.h
|
|
|
|
diff --git a/include/linux/resume-dependency.h b/include/linux/resume-dependency.h
|
|
new file mode 100644
|
|
index 0000000..b13aa3e
|
|
--- /dev/null
|
|
+++ b/include/linux/resume-dependency.h
|
|
@@ -0,0 +1,78 @@
|
|
+#ifndef __RESUME_DEPENDENCY_H__
|
|
+#define __RESUME_DEPENDENCY_H__
|
|
+
|
|
+/* Resume dependency framework
|
|
+ *
|
|
+ * (C) 2008 Openmoko, Inc.
|
|
+ * Author: Andy Green <andy@openmoko.com>
|
|
+ *
|
|
+ * 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; version 2.1.
|
|
+ *
|
|
+ * 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., 59 Temple Place, Suite 330, Boston,
|
|
+ * MA 02111-1307 USA
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/list.h>
|
|
+
|
|
+struct resume_dependency {
|
|
+ struct list_head list;
|
|
+
|
|
+ void (*callback)(void *); /* called with context as arg */
|
|
+ void * context;
|
|
+ int called_flag; /* set to 1 after called, use for multi dep */
|
|
+};
|
|
+
|
|
+/* if you are a driver accept to have other drivers as dependencies, you need to
|
|
+ * instantiate a struct resume_dependency above, then initialize it by invoking
|
|
+ * init_resume_dependency_list() on it
|
|
+ */
|
|
+
|
|
+#define init_resume_dependency_list(_head) \
|
|
+ INIT_LIST_HEAD(&_head.list);
|
|
+
|
|
+
|
|
+/* if your resume function depends on something else being resumed first, you
|
|
+ * can register the dependency by calling this in your suspend function with
|
|
+ * head being the list held by the thing you are dependent on, and dep being
|
|
+ * your struct resume_dependency
|
|
+ */
|
|
+
|
|
+#define register_resume_dependency(_head, _dep) { \
|
|
+ _dep->called_flag = 0; \
|
|
+ list_add(&_dep->list, &_head->list); \
|
|
+}
|
|
+
|
|
+/* In the resume function that things can be dependent on, at the end you
|
|
+ * invoke this macro. This calls back the dependent resumes now it is safe to
|
|
+ * use the resumed thing they were dependent on.
|
|
+ */
|
|
+
|
|
+#define callback_all_resume_dependencies(_head) { \
|
|
+ struct list_head *_pos, *_q; \
|
|
+ struct resume_dependency *_dep; \
|
|
+\
|
|
+ list_for_each_safe(pos, _q, &_head.list) { \
|
|
+ _dep = list_entry(_pos, struct resume_dependency, list); \
|
|
+ _dep->called_flag = 1; \
|
|
+ (_dep->callback)(dep->context); \
|
|
+ list_del(_pos); \
|
|
+ } \
|
|
+}
|
|
+
|
|
+/* if your resume action is dependent on multiple drivers being resumed already,
|
|
+ * register the same callback with each driver you are dependent on, and check
|
|
+ * .called_flag for all of the struct resume_dependency. When they are all 1
|
|
+ * you know it is the last callback and you can resume, otherwise just return
|
|
+ */
|
|
+
|
|
+#endif
|
|
--
|
|
1.5.6.5
|
|
|