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Message-ID: <20241107032626.16682-2-lihuisong@huawei.com>
Date: Thu, 7 Nov 2024 11:26:25 +0800
From: Huisong Li <lihuisong@...wei.com>
To: <linux-pm@...r.kernel.org>, <rafael@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <liuyonglong@...wei.com>,
<zhanjie9@...ilicon.com>, <lihuisong@...wei.com>
Subject: [PATCH v1 1/2] ACPI: thermal: Support for linking devices associated with the thermal zone
As ACPI spec said, '_TZD' evaluates to a package of device names.
Each name corresponds to a device in the ACPI namespace that is
associated with the thermal zone. The temperature reported by the
thermal zone is roughly correspondent to that of each of the devices.
Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
drivers/acpi/thermal.c | 114 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 113 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 78db38c7076e..398195a5d42f 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -119,6 +119,9 @@ struct acpi_thermal {
struct work_struct thermal_check_work;
struct mutex thermal_check_lock;
refcount_t thermal_check_count;
+ int num_domain_devices;
+ struct acpi_device **domain_devices;
+ struct kobject *holders_dir;
};
/* --------------------------------------------------------------------------
@@ -589,6 +592,103 @@ static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
.critical = acpi_thermal_zone_device_critical,
};
+static void acpi_thermal_remove_domain_devices(struct acpi_thermal *tz)
+{
+ int i;
+
+ if (!tz->num_domain_devices)
+ return;
+
+ for (i = 0; i < tz->num_domain_devices; i++) {
+ struct acpi_device *obj = tz->domain_devices[i];
+
+ if (!obj)
+ continue;
+
+ sysfs_remove_link(tz->holders_dir,
+ kobject_name(&obj->dev.kobj));
+ acpi_dev_put(obj);
+ }
+
+ kfree(tz->domain_devices);
+ kobject_put(tz->holders_dir);
+ tz->num_domain_devices = 0;
+}
+
+static int acpi_thermal_read_domain_devices(struct acpi_thermal *tz)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *pss;
+ acpi_status status;
+ int ret = 0;
+ int i;
+
+ status = acpi_evaluate_object(tz->device->handle, "_TZD", NULL,
+ &buffer);
+ if (ACPI_FAILURE(status)) {
+ acpi_evaluation_failure_warn(tz->device->handle, "_TZD",
+ status);
+ return -ENODEV;
+ }
+
+ pss = buffer.pointer;
+ if (!pss ||
+ pss->type != ACPI_TYPE_PACKAGE) {
+ dev_err(&tz->device->dev, "Thermal zone invalid _TZD data\n");
+ ret = -EFAULT;
+ goto end;
+ }
+
+ if (!pss->package.count)
+ goto end;
+
+ tz->domain_devices = kcalloc(pss->package.count,
+ sizeof(struct acpi_device *), GFP_KERNEL);
+ if (!tz->domain_devices) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ tz->holders_dir = kobject_create_and_add("measures",
+ &tz->device->dev.kobj);
+ if (!tz->holders_dir) {
+ ret = -ENOMEM;
+ goto exit_free;
+ }
+
+ tz->num_domain_devices = pss->package.count;
+ for (i = 0; i < pss->package.count; i++) {
+ struct acpi_device *obj;
+ union acpi_object *element = &pss->package.elements[i];
+
+ /* Refuse non-references */
+ if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
+ continue;
+
+ /* Create a symlink to domain objects */
+ obj = acpi_get_acpi_dev(element->reference.handle);
+ tz->domain_devices[i] = obj;
+ if (!obj)
+ continue;
+
+ ret = sysfs_create_link(tz->holders_dir, &obj->dev.kobj,
+ kobject_name(&obj->dev.kobj));
+ if (ret) {
+ acpi_dev_put(obj);
+ tz->domain_devices[i] = NULL;
+ }
+ }
+
+ ret = 0;
+ goto end;
+
+exit_free:
+ kfree(tz->domain_devices);
+end:
+ kfree(buffer.pointer);
+ return ret;
+}
+
static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
{
struct device *tzdev = thermal_zone_device(tz->thermal_zone);
@@ -602,8 +702,19 @@ static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
ret = sysfs_create_link(&tzdev->kobj,
&tz->device->dev.kobj, "device");
if (ret)
- sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
+ goto remove_thermal_zone;
+ /* _TZD method is optional. */
+ ret = acpi_thermal_read_domain_devices(tz);
+ if (ret != -ENODEV)
+ goto remove_device;
+
+ return 0;
+
+remove_device:
+ sysfs_remove_link(&tz->device->dev.kobj, "device");
+remove_thermal_zone:
+ sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
return ret;
}
@@ -611,6 +722,7 @@ static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
{
struct device *tzdev = thermal_zone_device(tz->thermal_zone);
+ acpi_thermal_remove_domain_devices(tz);
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
sysfs_remove_link(&tzdev->kobj, "device");
}
--
2.22.0
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