From patchwork Tue Sep 18 05:35:03 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: durgadoss.r@intel.com X-Patchwork-Id: 1470611 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id DC150DF24C for ; Tue, 18 Sep 2012 05:36:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754963Ab2IRFgd (ORCPT ); Tue, 18 Sep 2012 01:36:33 -0400 Received: from mga02.intel.com ([134.134.136.20]:28021 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755246Ab2IRFgc (ORCPT ); Tue, 18 Sep 2012 01:36:32 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 17 Sep 2012 22:36:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,441,1344236400"; d="scan'208";a="206744932" Received: from dr3-desktop.iind.intel.com ([10.223.107.36]) by orsmga002.jf.intel.com with ESMTP; 17 Sep 2012 22:36:30 -0700 From: Durgadoss R To: lenb@kernel.org, rui.zhang@intel.com Cc: linux-acpi@vger.kernel.org, eduardo.valentin@ti.com, Durgadoss R Subject: [PATCHv4 12/15] Thermal: Add a thermal notifier for user space Date: Tue, 18 Sep 2012 11:05:03 +0530 Message-Id: <1347946506-18449-13-git-send-email-durgadoss.r@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1347946506-18449-1-git-send-email-durgadoss.r@intel.com> References: <1347946506-18449-1-git-send-email-durgadoss.r@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org This patch registers a governor which will let the user land manage the platform thermals. Whenever a trip happens, this governor just notifies the user space using kobj_uevent(). Signed-off-by: Durgadoss R --- drivers/thermal/Kconfig | 6 ++++ drivers/thermal/Makefile | 1 + drivers/thermal/user_space.c | 68 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) create mode 100644 drivers/thermal/user_space.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 9f6a3aa..a3fd530 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -66,3 +66,9 @@ config STEP_WISE depends on THERMAL help Enable this to manage platform thermals using a simple linear + +config USER_SPACE + bool "User_space thermal governor" + depends on THERMAL + help + Enable this to let the user space manage the platform thermals. diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 4e53c00..e5f7974 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o obj-$(CONFIG_FAIR_SHARE) += fair_share.o obj-$(CONFIG_STEP_WISE) += step_wise.o +obj-$(CONFIG_USER_SPACE) += user_space.o diff --git a/drivers/thermal/user_space.c b/drivers/thermal/user_space.c new file mode 100644 index 0000000..fb246b90 --- /dev/null +++ b/drivers/thermal/user_space.c @@ -0,0 +1,68 @@ +/* + * user_space.c - A simple user space Thermal events notifier + * + * Copyright (C) 2012 Intel Corp + * Copyright (C) 2012 Durgadoss R + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * 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 of the License. + * + * 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. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include + +#include "thermal_core.h" + +/** + * notify_user_space - Notifies user space about thermal events + * @tz - thermal_zone_device + * + * This function notifies the user space through UEvents. + */ +int notify_user_space(struct thermal_zone_device *tz, int trip) +{ + mutex_lock(&tz->lock); + kobject_uevent(&tz->device.kobj, KOBJ_CHANGE); + mutex_unlock(&tz->lock); + return 0; +} + +struct thermal_governor thermal_gov_user_space = { + .name = "user_space", + .throttle = notify_user_space, + .owner = THIS_MODULE, +}; + +static int __init thermal_gov_user_space_init(void) +{ + return thermal_register_governor(&thermal_gov_user_space); +} + +static void __exit thermal_gov_user_space_exit(void) +{ + thermal_unregister_governor(&thermal_gov_user_space); +} + +/* This should load after thermal framework */ +fs_initcall(thermal_gov_user_space_init); +module_exit(thermal_gov_user_space_exit); + +MODULE_AUTHOR("Durgadoss R"); +MODULE_DESCRIPTION("A user space Thermal notifier"); +MODULE_LICENSE("GPL");