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[71.163.245.5]) by smtp.googlemail.com with ESMTPSA id g45sm21370801qtb.60.2020.09.16.20.22.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Sep 2020 20:22:33 -0700 (PDT) From: Thara Gopinath To: rui.zhang@intel.com, daniel.lezcano@linaro.org, robh+dt@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, lukasz.luba@arm.com, amitk@kernel.org Subject: [PATCH RFC 7/8] thermal:core: Add is_warming_dev and supporting warming device api's to the cooling dev framework. Date: Wed, 16 Sep 2020 23:22:25 -0400 Message-Id: <20200917032226.820371-8-thara.gopinath@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200917032226.820371-1-thara.gopinath@linaro.org> References: <20200917032226.820371-1-thara.gopinath@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Introduce a variable is_warming_dev to indicate if a "cooling" device is actually a warming device or not. Also introduce api's to register and unregister warming device. This is a temporary patch. If we agree to replace the term "cooling" with "mitigating" (or any other appropriate term) in the thermal framework, this patch can be dropped. Also I have not added warming_device_register api for all the versions of cooling_device_register because devm_thermal_of_warming_device_register is the only api needed in the kernel today as is evident by the next patch in this series. Signed-off-by: Thara Gopinath --- drivers/thermal/thermal_core.c | 88 +++++++++++++++++++++++++++++----- include/linux/thermal.h | 7 +++ 2 files changed, 83 insertions(+), 12 deletions(-) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index bfd436379408..4aae48a80e00 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -1101,7 +1101,8 @@ static void bind_cdev(struct thermal_cooling_device *cdev) */ static struct thermal_cooling_device * __thermal_cooling_device_register(struct device_node *np, - const char *type, void *devdata, + const char *type, bool is_warming_dev, + void *devdata, const struct thermal_cooling_device_ops *ops) { struct thermal_cooling_device *cdev; @@ -1134,6 +1135,7 @@ __thermal_cooling_device_register(struct device_node *np, cdev->updated = false; cdev->device.class = &thermal_class; cdev->devdata = devdata; + cdev->is_warming_dev = is_warming_dev; thermal_cooling_device_setup_sysfs(cdev); dev_set_name(&cdev->device, "cooling_device%d", cdev->id); result = device_register(&cdev->device); @@ -1178,7 +1180,7 @@ struct thermal_cooling_device * thermal_cooling_device_register(const char *type, void *devdata, const struct thermal_cooling_device_ops *ops) { - return __thermal_cooling_device_register(NULL, type, devdata, ops); + return __thermal_cooling_device_register(NULL, type, false, devdata, ops); } EXPORT_SYMBOL_GPL(thermal_cooling_device_register); @@ -1202,7 +1204,7 @@ thermal_of_cooling_device_register(struct device_node *np, const char *type, void *devdata, const struct thermal_cooling_device_ops *ops) { - return __thermal_cooling_device_register(np, type, devdata, ops); + return __thermal_cooling_device_register(np, type, false, devdata, ops); } EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register); @@ -1242,7 +1244,7 @@ devm_thermal_of_cooling_device_register(struct device *dev, if (!ptr) return ERR_PTR(-ENOMEM); - tcd = __thermal_cooling_device_register(np, type, devdata, ops); + tcd = __thermal_cooling_device_register(np, type, false, devdata, ops); if (IS_ERR(tcd)) { devres_free(ptr); return tcd; @@ -1255,6 +1257,49 @@ devm_thermal_of_cooling_device_register(struct device *dev, } EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register); +/** + * devm_thermal_of_warming_device_register() - register an OF thermal warming + * device + * @dev: a valid struct device pointer of a sensor device. + * @np: a pointer to a device tree node. + * @type: the thermal cooling device type. + * @devdata: device private data. + * @ops: standard thermal cooling devices callbacks. + * + * This function will register a warming device with device tree node reference. + * This interface function adds a new thermal warming device (fan/processor/...) + * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself + * to all the thermal zone devices registered at the same time. + * + * Return: a pointer to the created struct thermal_cooling_device or an + * ERR_PTR. Caller must check return value with IS_ERR*() helpers. + */ +struct thermal_cooling_device * +devm_thermal_of_warming_device_register(struct device *dev, + struct device_node *np, + char *type, void *devdata, + const struct thermal_cooling_device_ops *ops) +{ + struct thermal_cooling_device **ptr, *tcd; + + ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr), + GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + tcd = __thermal_cooling_device_register(np, type, true, devdata, ops); + if (IS_ERR(tcd)) { + devres_free(ptr); + return tcd; + } + + *ptr = tcd; + devres_add(dev, ptr); + + return tcd; +} +EXPORT_SYMBOL_GPL(devm_thermal_of_warming_device_register); + static void __unbind(struct thermal_zone_device *tz, int mask, struct thermal_cooling_device *cdev) { @@ -1265,14 +1310,8 @@ static void __unbind(struct thermal_zone_device *tz, int mask, thermal_zone_unbind_cooling_device(tz, i, cdev); } -/** - * thermal_cooling_device_unregister - removes a thermal cooling device - * @cdev: the thermal cooling device to remove. - * - * thermal_cooling_device_unregister() must be called when a registered - * thermal cooling device is no longer needed. - */ -void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) +static void +__thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) { int i; const struct thermal_zone_params *tzp; @@ -1319,8 +1358,33 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) thermal_cooling_device_destroy_sysfs(cdev); put_device(&cdev->device); } + +/** + * thermal_cooling_device_unregister - removes a thermal cooling device + * @cdev: the thermal cooling device to remove. + * + * thermal_cooling_device_unregister() must be called when a registered + * thermal cooling device is no longer needed. + */ +void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) +{ + __thermal_cooling_device_unregister(cdev); +} EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); +/** + * thermal_warming_device_unregister - removes a thermal warming device + * @cdev: the thermal warming device to remove. + * + * thermal_warming_device_unregister() must be called when a registered + * thermal warming device is no longer needed. + */ +void thermal_warming_device_unregister(struct thermal_cooling_device *cdev) +{ + __thermal_cooling_device_unregister(cdev); +} +EXPORT_SYMBOL_GPL(thermal_warming_device_unregister); + static void bind_tz(struct thermal_zone_device *tz) { int i, ret; diff --git a/include/linux/thermal.h b/include/linux/thermal.h index a50ed958d0bd..455120f485dd 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -96,6 +96,7 @@ struct thermal_cooling_device_ops { struct thermal_cooling_device { int id; + bool is_warming_dev; char type[THERMAL_NAME_LENGTH]; struct device device; struct device_node *np; @@ -393,7 +394,13 @@ devm_thermal_of_cooling_device_register(struct device *dev, struct device_node *np, char *type, void *devdata, const struct thermal_cooling_device_ops *ops); +struct thermal_cooling_device * +devm_thermal_of_warming_device_register(struct device *dev, + struct device_node *np, + char *type, void *devdata, + const struct thermal_cooling_device_ops *ops); void thermal_cooling_device_unregister(struct thermal_cooling_device *); +void thermal_warming_device_unregister(struct thermal_cooling_device *); struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name); int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp); int thermal_zone_get_slope(struct thermal_zone_device *tz);