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103 lines
3.4 KiB
Diff
103 lines
3.4 KiB
Diff
From 8330651863c4b554961204475073b7af1cdf10bc Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Fri, 25 Jul 2008 23:06:11 +0100
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Subject: [PATCH] introduce-resume-dependency.patch
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Defines a way for drivers to defer execution of resume callbacks
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until one or more other driver they are dependent on has itself
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resumed.
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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include/linux/resume-dependency.h | 78 +++++++++++++++++++++++++++++++++++++
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1 files changed, 78 insertions(+), 0 deletions(-)
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create mode 100644 include/linux/resume-dependency.h
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diff --git a/include/linux/resume-dependency.h b/include/linux/resume-dependency.h
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new file mode 100644
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index 0000000..b13aa3e
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--- /dev/null
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+++ b/include/linux/resume-dependency.h
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@@ -0,0 +1,78 @@
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+#ifndef __RESUME_DEPENDENCY_H__
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+#define __RESUME_DEPENDENCY_H__
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+
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+/* Resume dependency framework
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+ *
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+ * (C) 2008 Openmoko, Inc.
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+ * Author: Andy Green <andy@openmoko.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; version 2.1.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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+ * MA 02111-1307 USA
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+ *
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+ */
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+
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+#include <linux/list.h>
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+
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+struct resume_dependency {
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+ struct list_head list;
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+
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+ void (*callback)(void *); /* called with context as arg */
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+ void * context;
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+ int called_flag; /* set to 1 after called, use for multi dep */
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+};
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+
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+/* if you are a driver accept to have other drivers as dependencies, you need to
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+ * instantiate a struct resume_dependency above, then initialize it by invoking
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+ * init_resume_dependency_list() on it
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+ */
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+
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+#define init_resume_dependency_list(_head) \
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+ INIT_LIST_HEAD(&_head.list);
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+
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+
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+/* if your resume function depends on something else being resumed first, you
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+ * can register the dependency by calling this in your suspend function with
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+ * head being the list held by the thing you are dependent on, and dep being
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+ * your struct resume_dependency
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+ */
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+
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+#define register_resume_dependency(_head, _dep) { \
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+ _dep->called_flag = 0; \
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+ list_add(&_dep->list, &_head->list); \
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+}
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+
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+/* In the resume function that things can be dependent on, at the end you
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+ * invoke this macro. This calls back the dependent resumes now it is safe to
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+ * use the resumed thing they were dependent on.
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+ */
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+
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+#define callback_all_resume_dependencies(_head) { \
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+ struct list_head *_pos, *_q; \
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+ struct resume_dependency *_dep; \
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+\
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+ list_for_each_safe(pos, _q, &_head.list) { \
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+ _dep = list_entry(_pos, struct resume_dependency, list); \
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+ _dep->called_flag = 1; \
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+ (_dep->callback)(dep->context); \
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+ list_del(_pos); \
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+ } \
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+}
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+
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+/* if your resume action is dependent on multiple drivers being resumed already,
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+ * register the same callback with each driver you are dependent on, and check
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+ * .called_flag for all of the struct resume_dependency. When they are all 1
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+ * you know it is the last callback and you can resume, otherwise just return
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+ */
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+
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+#endif
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--
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1.5.6.3
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