From patchwork Tue Feb 5 10:46:16 2013 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: 2097301 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 99EC0DF24C for ; Tue, 5 Feb 2013 10:52:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754656Ab3BEKwG (ORCPT ); Tue, 5 Feb 2013 05:52:06 -0500 Received: from mga14.intel.com ([143.182.124.37]:3483 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754333Ab3BEKwC (ORCPT ); Tue, 5 Feb 2013 05:52:02 -0500 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga102.ch.intel.com with ESMTP; 05 Feb 2013 02:52:01 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,602,1355126400"; d="scan'208";a="252768320" Received: from dr3-desktop.iind.intel.com ([10.223.107.127]) by azsmga001.ch.intel.com with ESMTP; 05 Feb 2013 02:51:59 -0800 From: Durgadoss R To: rui.zhang@intel.com, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, eduardo.valentin@ti.com, hongbo.zhang@linaro.org, wni@nvidia.com, Durgadoss R Subject: [PATCH 1/8] Thermal: Create sensor level APIs Date: Tue, 5 Feb 2013 16:16:16 +0530 Message-Id: <1360061183-14137-2-git-send-email-durgadoss.r@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1360061183-14137-1-git-send-email-durgadoss.r@intel.com> References: <1360061183-14137-1-git-send-email-durgadoss.r@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patch creates sensor level APIs, in the generic thermal framework. A Thermal sensor is a piece of hardware that can report temperature of the spot in which it is placed. A thermal sensor driver reads the temperature from this sensor and reports it out. This kind of driver can be in any subsystem. If the sensor needs to participate in platform thermal management, the corresponding driver can use the APIs introduced in this patch, to register(or unregister) with the thermal framework. Signed-off-by: Durgadoss R --- drivers/thermal/thermal_sys.c | 280 +++++++++++++++++++++++++++++++++++++++++ include/linux/thermal.h | 29 +++++ 2 files changed, 309 insertions(+) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 0a1bf6b..cb94497 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -44,13 +44,16 @@ MODULE_LICENSE("GPL"); static DEFINE_IDR(thermal_tz_idr); static DEFINE_IDR(thermal_cdev_idr); +static DEFINE_IDR(thermal_sensor_idr); static DEFINE_MUTEX(thermal_idr_lock); static LIST_HEAD(thermal_tz_list); +static LIST_HEAD(thermal_sensor_list); static LIST_HEAD(thermal_cdev_list); static LIST_HEAD(thermal_governor_list); static DEFINE_MUTEX(thermal_list_lock); +static DEFINE_MUTEX(sensor_list_lock); static DEFINE_MUTEX(thermal_governor_lock); static struct thermal_governor *__find_governor(const char *name) @@ -423,6 +426,103 @@ static void thermal_zone_device_check(struct work_struct *work) #define to_thermal_zone(_dev) \ container_of(_dev, struct thermal_zone_device, device) +#define to_thermal_sensor(_dev) \ + container_of(_dev, struct thermal_sensor, device) + +static ssize_t +sensor_name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct thermal_sensor *ts = to_thermal_sensor(dev); + + return sprintf(buf, "%s\n", ts->name); +} + +static ssize_t +sensor_temp_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int ret; + long val; + struct thermal_sensor *ts = to_thermal_sensor(dev); + + ret = ts->ops->get_temp(ts, &val); + + return ret ? ret : sprintf(buf, "%ld\n", val); +} + +static ssize_t +hyst_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int indx, ret; + long val; + struct thermal_sensor *ts = to_thermal_sensor(dev); + + if (!sscanf(attr->attr.name, "threshold%d_hyst", &indx)) + return -EINVAL; + + ret = ts->ops->get_hyst(ts, indx, &val); + + return ret ? ret : sprintf(buf, "%ld\n", val); +} + +static ssize_t +hyst_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int indx, ret; + long val; + struct thermal_sensor *ts = to_thermal_sensor(dev); + + if (!ts->ops->set_hyst) + return -EPERM; + + if (!sscanf(attr->attr.name, "threshold%d_hyst", &indx)) + return -EINVAL; + + if (kstrtol(buf, 10, &val)) + return -EINVAL; + + ret = ts->ops->set_hyst(ts, indx, val); + + return ret ? ret : count; +} + +static ssize_t +threshold_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int indx, ret; + long val; + struct thermal_sensor *ts = to_thermal_sensor(dev); + + if (!sscanf(attr->attr.name, "threshold%d", &indx)) + return -EINVAL; + + ret = ts->ops->get_threshold(ts, indx, &val); + + return ret ? ret : sprintf(buf, "%ld\n", val); +} + +static ssize_t +threshold_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int indx, ret; + long val; + struct thermal_sensor *ts = to_thermal_sensor(dev); + + if (!ts->ops->set_threshold) + return -EPERM; + + if (!sscanf(attr->attr.name, "threshold%d", &indx)) + return -EINVAL; + + if (kstrtol(buf, 10, &val)) + return -EINVAL; + + ret = ts->ops->set_threshold(ts, indx, val); + + return ret ? ret : count; +} + static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -707,6 +807,10 @@ 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); +/* Thermal sensor attributes */ +static DEVICE_ATTR(sensor_name, 0444, sensor_name_show, NULL); +static DEVICE_ATTR(temp_input, 0444, sensor_temp_show, NULL); + /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ container_of(_dev, struct thermal_cooling_device, device) @@ -1493,6 +1597,182 @@ static void remove_trip_attrs(struct thermal_zone_device *tz) } /** + * enable_sensor_thresholds - create sysfs nodes for thresholdX + * @ts: the thermal sensor + * @count: Number of thresholds supported by sensor hardware + * + * 'Thresholds' are temperatures programmed into the sensor hardware, + * on crossing which the sensor generates an interrupt. 'Trip points' + * are temperatures which the thermal manager/governor thinks, some + * action should be taken when the sensor reaches the value. + */ +static int enable_sensor_thresholds(struct thermal_sensor *ts, int count) +{ + int i; + int size = sizeof(struct thermal_attr) * count; + + ts->thresh_attrs = kzalloc(size, GFP_KERNEL); + if (!ts->thresh_attrs) + return -ENOMEM; + + if (ts->ops->get_hyst) { + ts->hyst_attrs = kzalloc(size, GFP_KERNEL); + if (!ts->hyst_attrs) { + kfree(ts->thresh_attrs); + return -ENOMEM; + } + } + + ts->thresholds = count; + + /* Create threshold attributes */ + for (i = 0; i < count; i++) { + snprintf(ts->thresh_attrs[i].name, THERMAL_NAME_LENGTH, + "threshold%d", i); + + sysfs_attr_init(&ts->thresh_attrs[i].attr.attr); + ts->thresh_attrs[i].attr.attr.name = ts->thresh_attrs[i].name; + ts->thresh_attrs[i].attr.attr.mode = S_IRUGO | S_IWUSR; + ts->thresh_attrs[i].attr.show = threshold_show; + ts->thresh_attrs[i].attr.store = threshold_store; + + device_create_file(&ts->device, &ts->thresh_attrs[i].attr); + + /* Create threshold_hyst attributes */ + if (!ts->ops->get_hyst) + continue; + + snprintf(ts->hyst_attrs[i].name, THERMAL_NAME_LENGTH, + "threshold%d_hyst", i); + + sysfs_attr_init(&ts->hyst_attrs[i].attr.attr); + ts->hyst_attrs[i].attr.attr.name = ts->hyst_attrs[i].name; + ts->hyst_attrs[i].attr.attr.mode = S_IRUGO | S_IWUSR; + ts->hyst_attrs[i].attr.show = hyst_show; + ts->hyst_attrs[i].attr.store = hyst_store; + + device_create_file(&ts->device, &ts->hyst_attrs[i].attr); + } + return 0; +} + +/** + * thermal_sensor_register - register a new thermal sensor + * @name: name of the thermal sensor + * @count: Number of thresholds supported by hardware + * @ops: standard thermal sensor callbacks + * @devdata: private device data + */ +struct thermal_sensor *thermal_sensor_register(const char *name, int count, + struct thermal_sensor_ops *ops, void *devdata) +{ + struct thermal_sensor *ts; + int ret; + + if (!name || (name && strlen(name) >= THERMAL_NAME_LENGTH)) + return ERR_PTR(-EINVAL); + + if (!ops || !ops->get_temp) + return ERR_PTR(-EINVAL); + + ts = kzalloc(sizeof(*ts), GFP_KERNEL); + if (!ts) + return ERR_PTR(-ENOMEM); + + idr_init(&ts->idr); + ret = get_idr(&thermal_sensor_idr, &thermal_idr_lock, &ts->id); + if (ret) + goto exit_free; + + strcpy(ts->name, name); + ts->ops = ops; + ts->devdata = devdata; + ts->device.class = &thermal_class; + + dev_set_name(&ts->device, "sensor%d", ts->id); + ret = device_register(&ts->device); + if (ret) + goto exit_idr; + + ret = device_create_file(&ts->device, &dev_attr_sensor_name); + if (ret) + goto exit_unregister; + + ret = device_create_file(&ts->device, &dev_attr_temp_input); + if (ret) + goto exit_name; + + if (count > 0 && ts->ops->get_threshold) { + ret = enable_sensor_thresholds(ts, count); + if (ret) + goto exit_temp; + } + + /* Add this sensor to the global list of sensors */ + mutex_lock(&sensor_list_lock); + list_add_tail(&ts->node, &thermal_sensor_list); + mutex_unlock(&sensor_list_lock); + + return ts; + +exit_temp: + device_remove_file(&ts->device, &dev_attr_temp_input); +exit_name: + device_remove_file(&ts->device, &dev_attr_sensor_name); +exit_unregister: + device_unregister(&ts->device); +exit_idr: + release_idr(&thermal_sensor_idr, &thermal_idr_lock, ts->id); +exit_free: + kfree(ts); + return ERR_PTR(ret); +} +EXPORT_SYMBOL(thermal_sensor_register); + +void thermal_sensor_unregister(struct thermal_sensor *ts) +{ + int i; + struct thermal_sensor *pos, *next; + bool found = false; + + if (!ts) + return; + + mutex_lock(&sensor_list_lock); + list_for_each_entry_safe(pos, next, &thermal_sensor_list, node) { + if (pos == ts) { + list_del(&ts->node); + found = true; + break; + } + } + mutex_unlock(&sensor_list_lock); + + if (!found) + return; + + for (i = 0; i < ts->thresholds; i++) { + device_remove_file(&ts->device, &ts->thresh_attrs[i].attr); + if (ts->ops->get_hyst) { + device_remove_file(&ts->device, + &ts->hyst_attrs[i].attr); + } + } + + device_remove_file(&ts->device, &dev_attr_sensor_name); + device_remove_file(&ts->device, &dev_attr_temp_input); + + release_idr(&thermal_sensor_idr, &thermal_idr_lock, ts->id); + idr_destroy(&ts->idr); + + device_unregister(&ts->device); + + kfree(ts); + return; +} +EXPORT_SYMBOL(thermal_sensor_unregister); + +/** * thermal_zone_device_register - register a new thermal zone device * @type: the thermal zone device type * @trips: the number of trip points the thermal zone support diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 9b78f8c..5470dae 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -55,6 +55,7 @@ #define DEFAULT_THERMAL_GOVERNOR "user_space" #endif +struct thermal_sensor; struct thermal_zone_device; struct thermal_cooling_device; @@ -135,6 +136,15 @@ struct thermal_cooling_device_ops { int (*set_cur_state) (struct thermal_cooling_device *, unsigned long); }; +struct thermal_sensor_ops { + int (*get_temp) (struct thermal_sensor *, long *); + int (*get_trend) (struct thermal_sensor *, int, enum thermal_trend *); + int (*set_threshold) (struct thermal_sensor *, int, long); + int (*get_threshold) (struct thermal_sensor *, int, long *); + int (*set_hyst) (struct thermal_sensor *, int, long); + int (*get_hyst) (struct thermal_sensor *, int, long *); +}; + struct thermal_cooling_device { int id; char type[THERMAL_NAME_LENGTH]; @@ -152,6 +162,21 @@ struct thermal_attr { char name[THERMAL_NAME_LENGTH]; }; +struct thermal_sensor { + char name[THERMAL_NAME_LENGTH]; + int id; + int temp; + int prev_temp; + int thresholds; + void *devdata; + struct idr idr; + struct device device; + struct list_head node; + struct thermal_sensor_ops *ops; + struct thermal_attr *thresh_attrs; + struct thermal_attr *hyst_attrs; +}; + struct thermal_zone_device { int id; char type[THERMAL_NAME_LENGTH]; @@ -245,6 +270,10 @@ void notify_thermal_framework(struct thermal_zone_device *, int); int thermal_register_governor(struct thermal_governor *); void thermal_unregister_governor(struct thermal_governor *); +struct thermal_sensor *thermal_sensor_register(const char *, int, + struct thermal_sensor_ops *, void *); +void thermal_sensor_unregister(struct thermal_sensor *); + #ifdef CONFIG_NET extern int thermal_generate_netlink_event(struct thermal_zone_device *tz, enum events event);