hp-wmi: update to match current rfkill semantics

hp-wmi currently changes the RFKill state by altering the struct members
rather than using the dedicated interface, meaning that update events
won't be pushed to userspace.  This patch fixes that, along with fixing
the declared type of the WWAN kill switch.  It also ensures that rfkill
interfaces are only registered for hardware that exists.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Ivo van Doorn <ivdoorn@gmail.com>
Cc: Dave Young <hidave.darkstar@gmail.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/hp-wmi.c

@@ -177,9 +177,9 @@ static int hp_wmi_wifi_state(void)
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	if (wireless & 0x100)
-		return 1;
+		return RFKILL_STATE_UNBLOCKED;
 	else
-		return 0;
+		return RFKILL_STATE_SOFT_BLOCKED;
 }
 
 static int hp_wmi_bluetooth_state(void)
@@ -187,9 +187,9 @@ static int hp_wmi_bluetooth_state(void)
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	if (wireless & 0x10000)
-		return 1;
+		return RFKILL_STATE_UNBLOCKED;
 	else
-		return 0;
+		return RFKILL_STATE_SOFT_BLOCKED;
 }
 
 static int hp_wmi_wwan_state(void)
@@ -197,9 +197,9 @@ static int hp_wmi_wwan_state(void)
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	if (wireless & 0x1000000)
-		return 1;
+		return RFKILL_STATE_UNBLOCKED;
 	else
-		return 0;
+		return RFKILL_STATE_SOFT_BLOCKED;
 }
 
 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
@@ -338,12 +338,14 @@ void hp_wmi_notify(u32 value, void *context)
 			}
 		} else if (eventcode == 0x5) {
 			if (wifi_rfkill)
-				wifi_rfkill->state = hp_wmi_wifi_state();
+				rfkill_force_state(wifi_rfkill,
+						   hp_wmi_wifi_state());
 			if (bluetooth_rfkill)
-				bluetooth_rfkill->state =
-				    hp_wmi_bluetooth_state();
+				rfkill_force_state(bluetooth_rfkill,
+						   hp_wmi_bluetooth_state());
 			if (wwan_rfkill)
-				wwan_rfkill->state = hp_wmi_wwan_state();
+				rfkill_force_state(wwan_rfkill,
+						   hp_wmi_wwan_state());
 		} else
 			printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 			       eventcode);
@@ -398,6 +400,7 @@ static void cleanup_sysfs(struct platform_device *device)
 static int __init hp_wmi_bios_setup(struct platform_device *device)
 {
 	int err;
+	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	err = device_create_file(&device->dev, &dev_attr_display);
 	if (err)
@@ -412,28 +415,33 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 	if (err)
 		goto add_sysfs_error;
 
+	if (wireless & 0x1) {
 		wifi_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WLAN);
 		wifi_rfkill->name = "hp-wifi";
 		wifi_rfkill->state = hp_wmi_wifi_state();
 		wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
 		wifi_rfkill->user_claim_unsupported = 1;
+		rfkill_register(wifi_rfkill);
+	}
 
+	if (wireless & 0x2) {
 		bluetooth_rfkill = rfkill_allocate(&device->dev,
 						   RFKILL_TYPE_BLUETOOTH);
 		bluetooth_rfkill->name = "hp-bluetooth";
 		bluetooth_rfkill->state = hp_wmi_bluetooth_state();
 		bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
 		bluetooth_rfkill->user_claim_unsupported = 1;
+		rfkill_register(bluetooth_rfkill);
+	}
 
-	wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WIMAX);
+	if (wireless & 0x4) {
+		wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WWAN);
 		wwan_rfkill->name = "hp-wwan";
 		wwan_rfkill->state = hp_wmi_wwan_state();
 		wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
 		wwan_rfkill->user_claim_unsupported = 1;
-
-	rfkill_register(wifi_rfkill);
-	rfkill_register(bluetooth_rfkill);
 		rfkill_register(wwan_rfkill);
+	}
 
 	return 0;
 add_sysfs_error:
@@ -445,8 +453,11 @@ static int __exit hp_wmi_bios_remove(struct platform_device *device)
 {
 	cleanup_sysfs(device);
 
+	if (wifi_rfkill)
 		rfkill_unregister(wifi_rfkill);
+	if (bluetooth_rfkill)
 		rfkill_unregister(bluetooth_rfkill);
+	if (wwan_rfkill)
 		rfkill_unregister(wwan_rfkill);
 
 	return 0;