#ifndef __RESUME_DEPENDENCY_H__ #define __RESUME_DEPENDENCY_H__ /* Resume dependency framework * * (C) 2008 Openmoko, Inc. * Author: Andy Green * * 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 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