tc1100-wmi: Fix state reporting

The tc1100-wmi driver should print the current states of wireless LAN and
jogdial brightness control when "cat /sys/devices/platform/tc1100-wmi/wireless"
and "cat /sys/devices/platform/tc1100-wmi/jogdial" are executed, respectively.
What actually happens is that both of those commands print 0 regardless of the
hardware state. The cause is that wmi_query_block returns an ACPI_TYPE_INTEGER
rather than ACPI_TYPE_BUFFER as the driver assumes. Additionally, the driver
intends to return a jogdial state that is inverted with respect to the commands
required to set it (e.g. it intends to return 1 after the jogdial file was
written with 0).

This patch fixes both of those issues - the commands to query the
state now work, and should return the same state that was written.

http://bugzilla.kernel.org/show_bug.cgi?id=12286

Signed-off-by: Krzysztof Kosiński <tweenk.pl@gmail.com>
Acked-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/platform/x86/tc1100-wmi.c b/drivers/platform/x86/tc1100-wmi.c
index b4a4aa9ee482..44166003d4ef 100644
--- a/drivers/platform/x86/tc1100-wmi.c
+++ b/drivers/platform/x86/tc1100-wmi.c
@@ -94,9 +94,8 @@ static int get_state(u32 *out, u8 instance)
                 return -ENODEV;
 
         obj = (union acpi_object *) result.pointer;
-        if (obj && obj->type == ACPI_TYPE_BUFFER &&
-                obj->buffer.length == sizeof(u32)) {
-                tmp = *((u32 *) obj->buffer.pointer);
+        if (obj && obj->type == ACPI_TYPE_INTEGER) {
+                tmp = obj->integer.value;
         } else {
                 tmp = 0;
         }
@@ -109,7 +108,7 @@ static int get_state(u32 *out, u8 instance)
                 *out = (tmp == 3) ? 1 : 0;
                 return 0;
         case TC1100_INSTANCE_JOGDIAL:
-                *out = (tmp == 1) ? 1 : 0;
+                *out = (tmp == 1) ? 0 : 1;
                 return 0;
         default:
                 return -ENODEV;