From patchwork Fri Mar 22 21:13:06 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Valentin X-Patchwork-Id: 2322751 X-Patchwork-Delegate: rui.zhang@intel.com Return-Path: X-Original-To: patchwork-linux-pm@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 4E016DFE82 for ; Fri, 22 Mar 2013 21:13:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423126Ab3CVVNx (ORCPT ); Fri, 22 Mar 2013 17:13:53 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:44029 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423058Ab3CVVNw (ORCPT ); Fri, 22 Mar 2013 17:13:52 -0400 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id r2MLDp2H001675; Fri, 22 Mar 2013 16:13:52 -0500 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id r2MLDpe3018752; Fri, 22 Mar 2013 16:13:51 -0500 Received: from dlelxv24.itg.ti.com (172.17.1.199) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.2.342.3; Fri, 22 Mar 2013 16:13:51 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlelxv24.itg.ti.com (8.13.8/8.13.8) with ESMTP id r2MLDpue028567; Fri, 22 Mar 2013 16:13:51 -0500 Received: from localhost (h68-18.vpn.ti.com [172.24.68.18]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id r2MLDmV10124; Fri, 22 Mar 2013 16:13:49 -0500 (CDT) From: Eduardo Valentin To: Zhang Rui CC: , , Eduardo Valentin Subject: [PATCH 1/2] thermal: introduce thermal_zone_lookup_temperature helper function Date: Fri, 22 Mar 2013 17:13:06 -0400 Message-ID: <1363986787-28147-2-git-send-email-eduardo.valentin@ti.com> X-Mailer: git-send-email 1.7.7.1.488.ge8e1c In-Reply-To: <1363986787-28147-1-git-send-email-eduardo.valentin@ti.com> References: <1363986787-28147-1-git-send-email-eduardo.valentin@ti.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patch adds a helper function to get temperature of a thermal zone, based on the zone type name. It will perform a zone name lookup and return the last sensor temperature reading. In case the zone is not found or if the required parameters are invalid, it will return the corresponding error code. Signed-off-by: Eduardo Valentin --- drivers/thermal/thermal_sys.c | 32 ++++++++++++++++++++++++++++++++ include/linux/thermal.h | 1 + 2 files changed, 33 insertions(+), 0 deletions(-) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 5bd95d4..f0caa13 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -1790,6 +1790,38 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) } EXPORT_SYMBOL_GPL(thermal_zone_device_unregister); +/** + * thermal_lookup_temperature - search for a zone and returns its temperature + * @name: thermal zone name to fetch the temperature + * @temperature: pointer to store the zone temperature, in case it is found + * + * When the zone is found, updates @temperature and returns 0. + * + * Return: -EINVAL in case of wrong parameters, -ENODEV in case the zone + * is not found and 0 when it is successfully found. + */ +int thermal_zone_lookup_temperature(const char *name, int *temperature) +{ + struct thermal_zone_device *pos = NULL; + bool found = false; + + if (!name || !temperature) + return -EINVAL; + + mutex_lock(&thermal_list_lock); + list_for_each_entry(pos, &thermal_tz_list, node) + if (!strcmp(pos->type, name)) { + found = true; + break; + } + if (found) + *temperature = pos->last_temperature; + mutex_unlock(&thermal_list_lock); + + return found ? 0 : -ENODEV; +} +EXPORT_SYMBOL_GPL(thermal_zone_lookup_temperature); + #ifdef CONFIG_NET static struct genl_family thermal_event_genl_family = { .id = GENL_ID_GENERATE, diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 542a39c..2b2f902 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -237,6 +237,7 @@ void thermal_zone_device_update(struct thermal_zone_device *); struct thermal_cooling_device *thermal_cooling_device_register(char *, void *, const struct thermal_cooling_device_ops *); void thermal_cooling_device_unregister(struct thermal_cooling_device *); +int thermal_zone_lookup_temperature(const char *name, int *temperature); int thermal_zone_trend_get(struct thermal_zone_device *, int); struct thermal_instance *thermal_instance_get(struct thermal_zone_device *,