diff options
Diffstat (limited to 'target/linux/s3c24xx/patches/0154-introduce-resume-dependency.patch.patch')
| -rwxr-xr-x | target/linux/s3c24xx/patches/0154-introduce-resume-dependency.patch.patch | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches/0154-introduce-resume-dependency.patch.patch b/target/linux/s3c24xx/patches/0154-introduce-resume-dependency.patch.patch new file mode 100755 index 0000000000..b5f4b404f9 --- /dev/null +++ b/target/linux/s3c24xx/patches/0154-introduce-resume-dependency.patch.patch @@ -0,0 +1,102 @@ +From 8330651863c4b554961204475073b7af1cdf10bc Mon Sep 17 00:00:00 2001 +From: Andy Green <andy@openmoko.com> +Date: Fri, 25 Jul 2008 23:06:11 +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 +-- +1.5.6.3 + |