From patchwork Wed Jan 2 15:53:44 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Valentin X-Patchwork-Id: 1924681 X-Patchwork-Delegate: rui.zhang@intel.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 1C2663FE37 for ; Wed, 2 Jan 2013 15:54:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752782Ab3ABPyH (ORCPT ); Wed, 2 Jan 2013 10:54:07 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:53970 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752761Ab3ABPyG (ORCPT ); Wed, 2 Jan 2013 10:54:06 -0500 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id r02Fs4YH029581; Wed, 2 Jan 2013 09:54:04 -0600 Received: from DLEE74.ent.ti.com (dlee74.ent.ti.com [157.170.170.8]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id r02Fs43h032346; Wed, 2 Jan 2013 09:54:04 -0600 Received: from dlelxv23.itg.ti.com (172.17.1.198) by DLEE74.ent.ti.com (157.170.170.8) with Microsoft SMTP Server id 14.1.323.3; Wed, 2 Jan 2013 09:54:04 -0600 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlelxv23.itg.ti.com (8.13.8/8.13.8) with ESMTP id r02Fs3Ig004353; Wed, 2 Jan 2013 09:54:03 -0600 Received: from localhost (h64-4.vpn.ti.com [172.24.64.4]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id r02Fs2w17407; Wed, 2 Jan 2013 09:54:02 -0600 (CST) From: Eduardo Valentin To: CC: , , , Eduardo Valentin Subject: [RFC PATCH 1/1] thermal: introduce thermal_zone_lookup_temperature helper function Date: Wed, 2 Jan 2013 17:53:44 +0200 Message-ID: <1357142024-8324-1-git-send-email-eduardo.valentin@ti.com> X-Mailer: git-send-email 1.7.7.1.488.ge8e1c 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. With this, we could write platform code to fetch several temperature from several sensors and derive "summary" temperature for a virtual thermal zone. Signed-off-by: Eduardo Valentin --- drivers/thermal/thermal_sys.c | 30 ++++++++++++++++++++++++++++++ include/linux/thermal.h | 1 + 2 files changed, 31 insertions(+), 0 deletions(-) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index a24b010..4269571 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -1703,6 +1703,36 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) } EXPORT_SYMBOL(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. Returns + * -EINVAL in case of wrong parameters and -ENODEV in case the zone is not 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(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 e85ac70..e0cb335c 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -233,6 +233,7 @@ 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 get_tz_trend(struct thermal_zone_device *, int); struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,