platform/x86: hp-wmi: Use zero insize parameter only when supported

[linux-2.6-microblaze.git] / drivers / platform / x86 / hp-wmi.c

diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index e4a53c3..0d8cb22 100644 (file)
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -38,6 +38,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
 #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
 #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
 #define HP_OMEN_EC_THERMAL_PROFILE_OFFSET 0x95
+#define zero_if_sup(tmp) (zero_insize_support?0:sizeof(tmp)) // use when zero insize is required
 
 /* DMI board names of devices that should use the omen specific path for
  * thermal profiles.
@@ -220,6 +221,7 @@ static struct input_dev *hp_wmi_input_dev;
 static struct platform_device *hp_wmi_platform_dev;
 static struct platform_profile_handler platform_profile_handler;
 static bool platform_profile_support;
+static bool zero_insize_support;
 
 static struct rfkill *wifi_rfkill;
 static struct rfkill *bluetooth_rfkill;
@@ -376,7 +378,7 @@ static int hp_wmi_read_int(int query)
        int val = 0, ret;
 
        ret = hp_wmi_perform_query(query, HPWMI_READ, &val,
-                                  0, sizeof(val));
+                                  zero_if_sup(val), sizeof(val));
 
        if (ret)
                return ret < 0 ? ret : -EINVAL;
@@ -412,7 +414,8 @@ static int hp_wmi_get_tablet_mode(void)
                return -ENODEV;
 
        ret = hp_wmi_perform_query(HPWMI_SYSTEM_DEVICE_MODE, HPWMI_READ,
-                                  system_device_mode, 0, sizeof(system_device_mode));
+                                  system_device_mode, zero_if_sup(system_device_mode),
+                                  sizeof(system_device_mode));
        if (ret < 0)
                return ret;
 
@@ -499,7 +502,7 @@ static int hp_wmi_fan_speed_max_get(void)
        int val = 0, ret;
 
        ret = hp_wmi_perform_query(HPWMI_FAN_SPEED_MAX_GET_QUERY, HPWMI_GM,
-                                  &val, 0, sizeof(val));
+                                  &val, zero_if_sup(val), sizeof(val));
 
        if (ret)
                return ret < 0 ? ret : -EINVAL;
@@ -511,7 +514,7 @@ static int __init hp_wmi_bios_2008_later(void)
 {
        int state = 0;
        int ret = hp_wmi_perform_query(HPWMI_FEATURE_QUERY, HPWMI_READ, &state,
-                                      0, sizeof(state));
+                                      zero_if_sup(state), sizeof(state));
        if (!ret)
                return 1;
 
@@ -522,7 +525,7 @@ static int __init hp_wmi_bios_2009_later(void)
 {
        u8 state[128];
        int ret = hp_wmi_perform_query(HPWMI_FEATURE2_QUERY, HPWMI_READ, &state,
-                                      0, sizeof(state));
+                                      zero_if_sup(state), sizeof(state));
        if (!ret)
                return 1;
 
@@ -600,7 +603,7 @@ static int hp_wmi_rfkill2_refresh(void)
        int err, i;
 
        err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, HPWMI_READ, &state,
-                                  0, sizeof(state));
+                                  zero_if_sup(state), sizeof(state));
        if (err)
                return err;
 
@@ -1009,7 +1012,7 @@ static int __init hp_wmi_rfkill2_setup(struct platform_device *device)
        int err, i;
 
        err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, HPWMI_READ, &state,
-                                  0, sizeof(state));
+                                  zero_if_sup(state), sizeof(state));
        if (err)
                return err < 0 ? err : -EINVAL;
 
@@ -1485,11 +1488,15 @@ static int __init hp_wmi_init(void)
 {
        int event_capable = wmi_has_guid(HPWMI_EVENT_GUID);
        int bios_capable = wmi_has_guid(HPWMI_BIOS_GUID);
-       int err;
+       int err, tmp = 0;
 
        if (!bios_capable && !event_capable)
                return -ENODEV;
 
+       if (hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, HPWMI_READ, &tmp,
+                                sizeof(tmp), sizeof(tmp)) == HPWMI_RET_INVALID_PARAMETERS)
+               zero_insize_support = true;
+
        if (event_capable) {
                err = hp_wmi_input_setup();
                if (err)