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Subject[PATCH RFC 7/8] thermal:core: Add is_warming_dev and supporting warming device api's to the cooling dev framework.
Date
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 <thara.gopinath@linaro.org>
---
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);
--
2.25.1
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