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Subject[PATCH 11/31] thermal: core: move trips attributes to tz->device.groups
Date
Finally, move the last thermal zone sysfs attributes to
tz->device.groups: trips attributes. This requires adding a
attribute_group to thermal_zone_device, creating it dynamically, and
then setting all trips attributes in it. The trips attribute is then
added to the tz->device.groups.

As the removal of all attributes are handled by device core, the device
remove calls are not needed anymore.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
---
drivers/thermal/thermal_core.c | 75 +++++++++++++++++++++---------------------
include/linux/thermal.h | 2 ++
2 files changed, 39 insertions(+), 38 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 13a85d7..e844a04 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1184,8 +1184,9 @@ static const struct attribute_group *thermal_zone_attribute_groups[] = {
*/
static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
{
- int indx;
int size = sizeof(struct thermal_attr) * tz->trips;
+ struct attribute **attrs;
+ int indx;

tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
if (!tz->trip_type_attrs)
@@ -1206,6 +1207,14 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
}
}

+ attrs = kzalloc(sizeof(*attrs) * tz->trips * 3, GFP_KERNEL);
+ if (!attrs) {
+ kfree(tz->trip_type_attrs);
+ kfree(tz->trip_temp_attrs);
+ if (tz->ops->get_trip_hyst)
+ kfree(tz->trip_hyst_attrs);
+ return -ENOMEM;
+ }

for (indx = 0; indx < tz->trips; indx++) {
/* create trip type attribute */
@@ -1217,9 +1226,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
tz->trip_type_attrs[indx].name;
tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
-
- device_create_file(&tz->device,
- &tz->trip_type_attrs[indx].attr);
+ attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;

/* create trip temp attribute */
snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
@@ -1236,9 +1243,7 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
tz->trip_temp_attrs[indx].attr.store =
trip_point_temp_store;
}
-
- device_create_file(&tz->device,
- &tz->trip_temp_attrs[indx].attr);
+ attrs[indx + tz->trips] = &tz->trip_type_attrs[indx].attr.attr;

/* create Optional trip hyst attribute */
if (!tz->ops->get_trip_hyst)
@@ -1256,45 +1261,37 @@ static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
tz->trip_hyst_attrs[indx].attr.store =
trip_point_hyst_store;
}
-
- device_create_file(&tz->device,
- &tz->trip_hyst_attrs[indx].attr);
+ attrs[indx + tz->trips * 2] =
+ &tz->trip_type_attrs[indx].attr.attr;
}
- return 0;
-}

-static void remove_trip_attrs(struct thermal_zone_device *tz)
-{
- int indx;
+ tz->trips_attribute_group.attrs = attrs;

- for (indx = 0; indx < tz->trips; indx++) {
- device_remove_file(&tz->device,
- &tz->trip_type_attrs[indx].attr);
- device_remove_file(&tz->device,
- &tz->trip_temp_attrs[indx].attr);
- if (tz->ops->get_trip_hyst)
- device_remove_file(&tz->device,
- &tz->trip_hyst_attrs[indx].attr);
- }
- kfree(tz->trip_type_attrs);
- kfree(tz->trip_temp_attrs);
- kfree(tz->trip_hyst_attrs);
+ return 0;
}

-static int thermal_zone_create_device_groups(struct thermal_zone_device *tz)
+static int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
+ int mask)
{
const struct attribute_group **groups;
- int i, size;
+ int i, size, result;
+
+ result = create_trip_attrs(tz, mask);
+ if (result)
+ return result;

- size = ARRAY_SIZE(thermal_zone_attribute_groups) + 1;
+ /* we need one extra for trips and the NULL to terminate the array */
+ size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
/* This also takes care of API requirement to be NULL terminated */
groups = kzalloc(size * sizeof(*groups), GFP_KERNEL);
if (!groups)
return -ENOMEM;

- for (i = 0; i < size - 1; i++)
+ for (i = 0; i < size - 2; i++)
groups[i] = thermal_zone_attribute_groups[i];

+ groups[size - 2] = &tz->trips_attribute_group;
+
tz->device.groups = groups;

return 0;
@@ -1931,8 +1928,12 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
tz->passive_delay = passive_delay;
tz->polling_delay = polling_delay;

+ /* sys I/F */
/* Add nodes that are always present via .groups */
- thermal_zone_create_device_groups(tz);
+ result = thermal_zone_create_device_groups(tz, mask);
+ if (result)
+ goto unregister;
+
/* A new thermal zone needs to be updated anyway. */
atomic_set(&tz->need_update, 1);

@@ -1944,11 +1945,6 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
return ERR_PTR(result);
}

- /* sys I/F */
- result = create_trip_attrs(tz, mask);
- if (result)
- goto unregister;
-
for (count = 0; count < trips; count++) {
if (tz->ops->get_trip_type(tz, count, &trip_type))
set_bit(count, &tz->trips_disabled);
@@ -2053,7 +2049,10 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)

thermal_zone_device_set_polling(tz, 0);

- remove_trip_attrs(tz);
+ kfree(tz->trip_type_attrs);
+ kfree(tz->trip_temp_attrs);
+ kfree(tz->trip_hyst_attrs);
+ kfree(tz->trips_attribute_group.attrs);
thermal_set_governor(tz, NULL);

thermal_remove_hwmon_sysfs(tz);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 97b86c5..17c4431 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -28,6 +28,7 @@
#include <linux/of.h>
#include <linux/idr.h>
#include <linux/device.h>
+#include <linux/sysfs.h>
#include <linux/workqueue.h>
#include <uapi/linux/thermal.h>

@@ -187,6 +188,7 @@ struct thermal_zone_device {
int id;
char type[THERMAL_NAME_LENGTH];
struct device device;
+ struct attribute_group trips_attribute_group;
struct thermal_attr *trip_temp_attrs;
struct thermal_attr *trip_type_attrs;
struct thermal_attr *trip_hyst_attrs;
--
2.1.4
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