sony-laptop: check for rfkill hard block at load time

"I recently (on a flight) I found out that when I boot with the hard-switch
activated, so turning off all wireless activity on my laptop, the state
is not correctly announced in /dev/rfkill (reading it with rfkill command,
or my own gnome applet)...

After turning off and on again the hard-switch the events were right."

We can fix this by querying the firmware at load time and calling
rfkill_set_hw_state().

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Tested-by: Norbert Preining <preining@logic.at>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Mattia Dongili <malattia@linux.it>
CC: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index f9f68e0e7344..f3466a0fa25f 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1078,6 +1078,8 @@ static int sony_nc_setup_rfkill(struct acpi_device *device,
         struct rfkill *rfk;
         enum rfkill_type type;
         const char *name;
+        int result;
+        bool hwblock;
 
         switch (nc_type) {
         case SONY_WIFI:
@@ -1105,6 +1107,10 @@ static int sony_nc_setup_rfkill(struct acpi_device *device,
         if (!rfk)
                 return -ENOMEM;
 
+        sony_call_snc_handle(0x124, 0x200, &result);
+        hwblock = !(result & 0x1);
+        rfkill_set_hw_state(rfk, hwblock);
+
         err = rfkill_register(rfk);
         if (err) {
                 rfkill_destroy(rfk);