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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2016-04-05 14:52:57 -0700
committerZhang Rui <rui.zhang@intel.com>2016-05-08 00:07:38 +0800
commitf1ba9eb85b5e2ad79a3fcd594c6fe4d6956fd163 (patch)
tree6b65c40436c633ad95f7849d220fbe144a4d2c8d /drivers/thermal
parentb721ca0d192754deccb89fb01c77e41e6fd91ad9 (diff)
downloadlinux-f1ba9eb85b5e2ad79a3fcd594c6fe4d6956fd163.tar.bz2
thermal: int340x: processor_thermal: support acpi notification
BIOS/EC can change PPCC element dynamically and inform OS about the change. When this driver receives notification, it will read PPCC element again. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/int340x_thermal/processor_thermal_device.c108
1 files changed, 77 insertions, 31 deletions
diff --git a/drivers/thermal/int340x_thermal/processor_thermal_device.c b/drivers/thermal/int340x_thermal/processor_thermal_device.c
index 36fa724a36c8..42c1ac057bad 100644
--- a/drivers/thermal/int340x_thermal/processor_thermal_device.c
+++ b/drivers/thermal/int340x_thermal/processor_thermal_device.c
@@ -198,49 +198,33 @@ static struct thermal_zone_device_ops proc_thermal_local_ops = {
.get_temp = proc_thermal_get_zone_temp,
};
-static int proc_thermal_add(struct device *dev,
- struct proc_thermal_device **priv)
+static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv)
{
- struct proc_thermal_device *proc_priv;
- struct acpi_device *adev;
+ int i;
acpi_status status;
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *elements, *ppcc;
union acpi_object *p;
- unsigned long long tmp;
- struct thermal_zone_device_ops *ops = NULL;
- int i;
- int ret;
-
- adev = ACPI_COMPANION(dev);
- if (!adev)
- return -ENODEV;
+ int ret = 0;
- status = acpi_evaluate_object(adev->handle, "PPCC", NULL, &buf);
+ status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC",
+ NULL, &buf);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buf.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
- dev_err(dev, "Invalid PPCC data\n");
+ dev_err(proc_priv->dev, "Invalid PPCC data\n");
ret = -EFAULT;
goto free_buffer;
}
+
if (!p->package.count) {
- dev_err(dev, "Invalid PPCC package size\n");
+ dev_err(proc_priv->dev, "Invalid PPCC package size\n");
ret = -EFAULT;
goto free_buffer;
}
- proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL);
- if (!proc_priv) {
- ret = -ENOMEM;
- goto free_buffer;
- }
-
- proc_priv->dev = dev;
- proc_priv->adev = adev;
-
for (i = 0; i < min((int)p->package.count - 1, 2); ++i) {
elements = &(p->package.elements[i+1]);
if (elements->type != ACPI_TYPE_PACKAGE ||
@@ -257,12 +241,62 @@ static int proc_thermal_add(struct device *dev,
proc_priv->power_limits[i].step_uw = ppcc[5].integer.value;
}
+free_buffer:
+ kfree(buf.pointer);
+
+ return ret;
+}
+
+#define PROC_POWER_CAPABILITY_CHANGED 0x83
+static void proc_thermal_notify(acpi_handle handle, u32 event, void *data)
+{
+ struct proc_thermal_device *proc_priv = data;
+
+ if (!proc_priv)
+ return;
+
+ switch (event) {
+ case PROC_POWER_CAPABILITY_CHANGED:
+ proc_thermal_read_ppcc(proc_priv);
+ int340x_thermal_zone_device_update(proc_priv->int340x_zone);
+ break;
+ default:
+ dev_err(proc_priv->dev, "Unsupported event [0x%x]\n", event);
+ break;
+ }
+}
+
+
+static int proc_thermal_add(struct device *dev,
+ struct proc_thermal_device **priv)
+{
+ struct proc_thermal_device *proc_priv;
+ struct acpi_device *adev;
+ acpi_status status;
+ unsigned long long tmp;
+ struct thermal_zone_device_ops *ops = NULL;
+ int ret;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev)
+ return -ENODEV;
+
+ proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL);
+ if (!proc_priv)
+ return -ENOMEM;
+
+ proc_priv->dev = dev;
+ proc_priv->adev = adev;
*priv = proc_priv;
- ret = sysfs_create_group(&dev->kobj,
- &power_limit_attribute_group);
+ ret = proc_thermal_read_ppcc(proc_priv);
+ if (!ret) {
+ ret = sysfs_create_group(&dev->kobj,
+ &power_limit_attribute_group);
+
+ }
if (ret)
- goto free_buffer;
+ return ret;
status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status)) {
@@ -274,20 +308,32 @@ static int proc_thermal_add(struct device *dev,
proc_priv->int340x_zone = int340x_thermal_zone_add(adev, ops);
if (IS_ERR(proc_priv->int340x_zone)) {
- sysfs_remove_group(&proc_priv->dev->kobj,
- &power_limit_attribute_group);
ret = PTR_ERR(proc_priv->int340x_zone);
+ goto remove_group;
} else
ret = 0;
-free_buffer:
- kfree(buf.pointer);
+ ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
+ proc_thermal_notify,
+ (void *)proc_priv);
+ if (ret)
+ goto remove_zone;
+
+ return 0;
+
+remove_zone:
+ int340x_thermal_zone_remove(proc_priv->int340x_zone);
+remove_group:
+ sysfs_remove_group(&proc_priv->dev->kobj,
+ &power_limit_attribute_group);
return ret;
}
static void proc_thermal_remove(struct proc_thermal_device *proc_priv)
{
+ acpi_remove_notify_handler(proc_priv->adev->handle,
+ ACPI_DEVICE_NOTIFY, proc_thermal_notify);
int340x_thermal_zone_remove(proc_priv->int340x_zone);
sysfs_remove_group(&proc_priv->dev->kobj,
&power_limit_attribute_group);