From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhang Rui Subject: [PATCH 07/34] Thermal: Add a policy sysfs attribute Date: Sun, 2 Dec 2012 22:44:41 +0800 Message-ID: <1354459508-3707-7-git-send-email-rui.zhang@intel.com> References: <1354459508-3707-1-git-send-email-rui.zhang@intel.com> Return-path: Received: from mga14.intel.com ([143.182.124.37]:34443 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751631Ab2LBOpg (ORCPT ); Sun, 2 Dec 2012 09:45:36 -0500 In-Reply-To: <1354459508-3707-1-git-send-email-rui.zhang@intel.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linux-pm@vger.kernel.org Cc: Durgadoss R , Zhang Rui From: Durgadoss R This patch adds a policy sysfs attribute to a thermal zone. This attribute denotes the throttling governor used for the zone. This is a RW attribute. Signed-off-by: Durgadoss R Signed-off-by: Zhang Rui --- drivers/thermal/thermal_sys.c | 42 ++++++++++++++++++++++++++++++++++++++-- 1 files changed, 39 insertions(+), 3 deletions(-) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 0afd84c..a6933da 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -454,10 +454,41 @@ passive_show(struct device *dev, struct device_attribute *attr, return sprintf(buf, "%d\n", tz->forced_passive); } +static ssize_t +policy_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret = -EINVAL; + struct thermal_zone_device *tz = to_thermal_zone(dev); + struct thermal_governor *gov; + + mutex_lock(&thermal_governor_lock); + + gov = __find_governor(buf); + if (!gov) + goto exit; + + tz->governor = gov; + ret = count; + +exit: + mutex_unlock(&thermal_governor_lock); + return ret; +} + +static ssize_t +policy_show(struct device *dev, struct device_attribute *devattr, char *buf) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + + return sprintf(buf, "%s\n", tz->governor->name); +} + static DEVICE_ATTR(type, 0444, type_show, NULL); static DEVICE_ATTR(temp, 0444, temp_show, NULL); static DEVICE_ATTR(mode, 0644, mode_show, mode_store); static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store); +static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store); /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ @@ -1509,10 +1540,14 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, passive = 1; } - if (!passive) - result = device_create_file(&tz->device, - &dev_attr_passive); + if (!passive) { + result = device_create_file(&tz->device, &dev_attr_passive); + if (result) + goto unregister; + } + /* Create policy attribute */ + result = device_create_file(&tz->device, &dev_attr_policy); if (result) goto unregister; @@ -1588,6 +1623,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) device_remove_file(&tz->device, &dev_attr_temp); if (tz->ops->get_mode) device_remove_file(&tz->device, &dev_attr_mode); + device_remove_file(&tz->device, &dev_attr_policy); remove_trip_attrs(tz); tz->governor = NULL; -- 1.7.7.6