From 0e2c0ae37e1fbc326c54a60b2845eb0c7566d389 Mon Sep 17 00:00:00 2001
From: Kyle Evans
Date: Tue, 1 Sep 2015 18:50:45 -0500
Subject: [PATCH] hp-wmi: limit hotkey enable
Do not write initialize magic on systems that do not have
feature query 0xb. Fixes Bug #82451.
Redefine FEATURE_QUERY to align with 0xb and FEATURE2 with 0xd
for code clearity.
Add a new test function, hp_wmi_bios_2008_later() & simplify
hp_wmi_bios_2009_later(), which fixes a bug in cases where
an improper value is returned. May also fix Bug #69131.
Signed-off-by: Kyle Evans
---
Since v1:
- Refactored feature query 0xb into separate function
- Redefine FEATURE_QUERY to align with 0xb and FEATURE2 with 0xd
Since v2:
- Simplify hp_wmi_bios_200x_later functions. No longer returns true
(4) when the test fails. However, if state is somehow useful, that is lost.
drivers/platform/x86/hp-wmi.c | 31 ---
1 file changed, 20 insertions(+), 11 deletions(-)
diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index 0669731..45a9eaa 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -54,8 +54,9 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
#define HPWMI_HARDWARE_QUERY 0x4
#define HPWMI_WIRELESS_QUERY 0x5
#define HPWMI_BIOS_QUERY 0x9
+#define HPWMI_FEATURE_QUERY 0xb
#define HPWMI_HOTKEY_QUERY 0xc
-#define HPWMI_FEATURE_QUERY 0xd
+#define HPWMI_FEATURE2_QUERY 0xd
#define HPWMI_WIRELESS2_QUERY 0x1b
#define HPWMI_POSTCODEERROR_QUERY 0x2a
@@ -295,25 +296,33 @@ static int hp_wmi_tablet_state(void)
return (state & 0x4) ? 1 : 0;
}
-static int __init hp_wmi_bios_2009_later(void)
+static int __init hp_wmi_bios_2008_later(void)
{
int state = 0;
int ret = hp_wmi_perform_query(HPWMI_FEATURE_QUERY, 0, &state,
sizeof(state), sizeof(state));
- if (ret)
- return ret;
+ if (!ret)
+ return 1;
- return (state & 0x10) ? 1 : 0;
+ return (ret == HPWMI_RET_UNKNOWN_CMDTYPE) ? 0 : -ENXIO;
}
-static int hp_wmi_enable_hotkeys(void)
+static int __init hp_wmi_bios_2009_later(void)
{
- int ret;
- int query = 0x6e;
+ int state = 0;
+ int ret = hp_wmi_perform_query(HPWMI_FEATURE2_QUERY, 0, &state,
+ sizeof(state), sizeof(state));
+ if (!ret)
+ return 1;
- ret = hp_wmi_perform_query(HPWMI_BIOS_QUERY, 1, &query, sizeof(query),
- 0);
+ return (ret == HPWMI_RET_UNKNOWN_CMDTYPE) ? 0 : -ENXIO;
+}
+static int hp_wmi_enable_hotkeys(void)
+{
+ int value = 0x6e;
+ int ret = hp_wmi_perform_query(HPWMI_BIOS_QUERY, 1, &value,
+ sizeof(value), 0);
if (ret)
return -EINVAL;
return 0;
@@ -663,7 +672,7 @@ static int __init hp_wmi_input_setup(void)
hp_wmi_tablet_state());
input_sync(hp_wmi_input_dev);
- if (hp_wmi_bios_2009_later() == 4)
+ if (!hp_wmi_bios_2009_later() && hp_wmi_2008_later())
hp_wmi_enable_hotkeys();
status = wmi_install_notify_handler(HPWMI_EVENT_GUID, hp_wmi_notify,
NULL);
--
1.8.5.5
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