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platform/x86: ideapad-laptop: introduce a generic notification chain

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[ Upstream commit 613e3900c24bb1379d994f44d75d31c3223cc263 ]

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@irl.hu>
Link: https://lore.kernel.org/r/c5a43efae8a32bd034c3d19c0a686941347575a7.1721898747.git.soyer@irl.hu
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Stable-dep-of: 5808c3421695 ("platform/x86: ideapad-laptop: use usleep_range() for EC polling")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gergo Koteles
2024-07-25 11:21:07 +02:00
committed by Greg Kroah-Hartman
parent b6b5bcae7a
commit d19ae7b033
2 changed files with 42 additions and 0 deletions
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37
drivers/platform/x86/ideapad-laptop.c
View File

@@ -1501,6 +1501,39 @@ 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;
@@ -1872,6 +1905,8 @@ 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:
@@ -1903,6 +1938,8 @@ 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,

5
drivers/platform/x86/ideapad-laptop.h
View File

@@ -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,