From: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
[ Upstream commit b5643539b82559b858b8efe3fc8343f66cf9a0b5 ]
Some revisions of the ASUS Q500A series have a keyboard related
issue which is reproducible only after Windows with installed ASUS
tools is started.
In this case the Linux side will have a blocked keyboard or
report incorrect or incomplete hotkey events.
To make Linux work properly again, a complete power down
(unplug power supply and remove battery) is needed.
Linux/atkbd after a clean start will get the following code on VOLUME_UP
key: {0xe0, 0x30, 0xe0, 0xb0}. After Windows, the same key will generate
this codes: {0xe1, 0x23, 0xe0, 0x30, 0xe0, 0xb0}. As result atkdb will
be confused by buggy codes.
This patch is filtering this buggy code out.
https://bugzilla.kernel.org/show_bug.cgi?id=119391
Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
Cc: Alex Henrie <alexhenrie24@xxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Corentin Chary <corentin.chary@xxxxxxxxx>
Cc: acpi4asus-user@xxxxxxxxxxxxxxxxxxxxx
Cc: platform-driver-x86@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
[dvhart: Add return after pr_warn to avoid false confirmation of filter]
Signed-off-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/platform/x86/asus-nb-wmi.c | 45 ++++++++++++++++++++++++++++++
drivers/platform/x86/asus-wmi.h | 4 +++
2 files changed, 49 insertions(+)
diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
index 734f95c09508f..904e28d4db528 100644
--- a/drivers/platform/x86/asus-nb-wmi.c
+++ b/drivers/platform/x86/asus-nb-wmi.c
@@ -27,6 +27,7 @@
#include <linux/input/sparse-keymap.h>
#include <linux/fb.h>
#include <linux/dmi.h>
+#include <linux/i8042.h>
#include "asus-wmi.h"
@@ -55,10 +56,34 @@ MODULE_PARM_DESC(wapf, "WAPF value");
static struct quirk_entry *quirks;
+static bool asus_q500a_i8042_filter(unsigned char data, unsigned char str,
+ struct serio *port)
+{
+ static bool extended;
+ bool ret = false;
+
+ if (str & I8042_STR_AUXDATA)
+ return false;
+
+ if (unlikely(data == 0xe1)) {
+ extended = true;
+ ret = true;
+ } else if (unlikely(extended)) {
+ extended = false;
+ ret = true;
+ }
+
+ return ret;
+}
+
static struct quirk_entry quirk_asus_unknown = {
.wapf = 0,
};
+static struct quirk_entry quirk_asus_q500a = {
+ .i8042_filter = asus_q500a_i8042_filter,
+};
+
/*
* For those machines that need software to control bt/wifi status
* and can't adjust brightness through ACPI interface
@@ -94,6 +119,15 @@ static int dmi_matched(const struct dmi_system_id *dmi)
}
static const struct dmi_system_id asus_quirks[] = {
+ {
+ .callback = dmi_matched,
+ .ident = "ASUSTeK COMPUTER INC. Q500A",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Q500A"),
+ },
+ .driver_data = &quirk_asus_q500a,
+ },
{
.callback = dmi_matched,
.ident = "ASUSTeK COMPUTER INC. U32U",
@@ -365,6 +399,8 @@ static const struct dmi_system_id asus_quirks[] = {
static void asus_nb_wmi_quirks(struct asus_wmi_driver *driver)
{
+ int ret;
+
quirks = &quirk_asus_unknown;
dmi_check_system(asus_quirks);
@@ -376,6 +412,15 @@ static void asus_nb_wmi_quirks(struct asus_wmi_driver *driver)
quirks->wapf = wapf;
else
wapf = quirks->wapf;
+
+ if (quirks->i8042_filter) {
+ ret = i8042_install_filter(quirks->i8042_filter);
+ if (ret) {
+ pr_warn("Unable to install key filter\n");
+ return;
+ }
+ pr_info("Using i8042 filter function for receiving events\n");
+ }
}
static const struct key_entry asus_nb_wmi_keymap[] = {
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index 5de1df510ebd8..dd2e6cc0f3d48 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -28,6 +28,7 @@
#define _ASUS_WMI_H_
#include <linux/platform_device.h>
+#include <linux/i8042.h>
#define ASUS_WMI_KEY_IGNORE (-1)
#define ASUS_WMI_BRN_DOWN 0x20
@@ -51,6 +52,9 @@ struct quirk_entry {
* and let the ACPI interrupt to send out the key event.
*/
int no_display_toggle;
+
+ bool (*i8042_filter)(unsigned char data, unsigned char str,
+ struct serio *serio);
};
struct asus_wmi_driver {
--
2.20.1
