Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761851Ab3DCWOJ (ORCPT ); Wed, 3 Apr 2013 18:14:09 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:36179 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759285Ab3DCWOH (ORCPT ); Wed, 3 Apr 2013 18:14:07 -0400 From: Eduardo Valentin To: CC: , , , Eduardo Valentin Subject: [PATCHv2 1/3] thermal: introduce thermal_zone_get_zone_by_name helper function Date: Wed, 3 Apr 2013 18:13:15 -0400 Message-ID: <1365027197-2793-2-git-send-email-eduardo.valentin@ti.com> X-Mailer: git-send-email 1.7.7.1.488.ge8e1c In-Reply-To: <1365027197-2793-1-git-send-email-eduardo.valentin@ti.com> References: <1365027197-2793-1-git-send-email-eduardo.valentin@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2908 Lines: 80 This patch adds a helper function to get a reference of a thermal zone, based on the zone type name. It will perform a zone name lookup and return a reference to a thermal zone device that matches the name requested. In case the zone is not found or when several zones match same name or if the required parameters are invalid, it will return the corresponding error code (ERR_PTR). Signed-off-by: Eduardo Valentin --- drivers/thermal/thermal_sys.c | 34 ++++++++++++++++++++++++++++++++++ include/linux/thermal.h | 1 + 2 files changed, 35 insertions(+), 0 deletions(-) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 5bd95d4..6e1da0a 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -1790,6 +1790,40 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) } EXPORT_SYMBOL_GPL(thermal_zone_device_unregister); +/** + * thermal_zone_get_zone_by_name() - search for a zone and returns its ref + * @name: thermal zone name to fetch the temperature + * + * When only one zone is found with the passed name, returns a reference to it. + * + * Return: On success returns a reference to an unique thermal zone with + * matching name equals to @name, a ERR_PTR otherwise. + */ +struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) +{ + struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); + int found = 0; + + if (!name) + goto exit; + + mutex_lock(&thermal_list_lock); + list_for_each_entry(pos, &thermal_tz_list, node) + if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) { + found++; + ref = pos; + } + mutex_unlock(&thermal_list_lock); + + /* Success only when an unique zone is found */ + if (found != 1) + ref = ERR_PTR(-ENODEV); + +exit: + return ref; +} +EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); + #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..0cf9eb5 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 *); +struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name); int thermal_zone_trend_get(struct thermal_zone_device *, int); struct thermal_instance *thermal_instance_get(struct thermal_zone_device *, -- 1.7.7.1.488.ge8e1c -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/