There are several cases where a notification chain can simplify Lenovo
WMI drivers.
Add a generic notification chain into ideapad-laptop.
Signed-off-by: Gergo Koteles <soyer@xxxxxx>
---
drivers/platform/x86/ideapad-laptop.c | 37 +++++++++++++++++++++++++++
drivers/platform/x86/ideapad-laptop.h | 5 ++++
2 files changed, 42 insertions(+)
diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 1ace711f7442..866b32bfe2c9 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -1592,6 +1592,39 @@ static void ideapad_sync_touchpad_state(struct ideapad_private *priv, bool send_
priv->r_touchpad_val = value;
}
+static int ideapad_laptop_nb_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ switch (action) {
+ }
+
+ return 0;
+}
+
+static struct notifier_block ideapad_laptop_notifier = {
+ .notifier_call = ideapad_laptop_nb_notify,
+};
+
+static BLOCKING_NOTIFIER_HEAD(ideapad_laptop_chain_head);
+
+int ideapad_laptop_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&ideapad_laptop_chain_head, nb);
+}
+EXPORT_SYMBOL_NS_GPL(ideapad_laptop_register_notifier, IDEAPAD_LAPTOP);
+
+int ideapad_laptop_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&ideapad_laptop_chain_head, nb);
+}
+EXPORT_SYMBOL_NS_GPL(ideapad_laptop_unregister_notifier, IDEAPAD_LAPTOP);
+
+void ideapad_laptop_call_notifier(unsigned long action, void *data)
+{
+ blocking_notifier_call_chain(&ideapad_laptop_chain_head, action, data);
+}
+EXPORT_SYMBOL_NS_GPL(ideapad_laptop_call_notifier, IDEAPAD_LAPTOP);
+
static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
{
struct ideapad_private *priv = data;
@@ -1974,6 +2007,8 @@ static int ideapad_acpi_add(struct platform_device *pdev)
if (err)
goto shared_init_failed;
+ ideapad_laptop_register_notifier(&ideapad_laptop_notifier);
+
return 0;
shared_init_failed:
@@ -2006,6 +2041,8 @@ static void ideapad_acpi_remove(struct platform_device *pdev)
struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);
int i;
+ ideapad_laptop_unregister_notifier(&ideapad_laptop_notifier);
+
ideapad_shared_exit(priv);
acpi_remove_notify_handler(priv->adev->handle,
diff --git a/drivers/platform/x86/ideapad-laptop.h b/drivers/platform/x86/ideapad-laptop.h
index 4498a96de597..3eb0dcd6bf7b 100644
--- a/drivers/platform/x86/ideapad-laptop.h
+++ b/drivers/platform/x86/ideapad-laptop.h
@@ -12,6 +12,11 @@
#include <linux/acpi.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
+#include <linux/notifier.h>
+
+int ideapad_laptop_register_notifier(struct notifier_block *nb);
+int ideapad_laptop_unregister_notifier(struct notifier_block *nb);
+void ideapad_laptop_call_notifier(unsigned long action, void *data);
enum {
VPCCMD_R_VPC1 = 0x10,
--
2.45.2
