rfkill: rewrite

This patch completely rewrites the rfkill core to address
the following deficiencies:

 * all rfkill drivers need to implement polling where necessary
   rather than having one central implementation

 * updating the rfkill state cannot be done from arbitrary
   contexts, forcing drivers to use schedule_work and requiring
   lots of code

 * rfkill drivers need to keep track of soft/hard blocked
   internally -- the core should do this

 * the rfkill API has many unexpected quirks, for example being
   asymmetric wrt. alloc/free and register/unregister

 * rfkill can call back into a driver from within a function the
   driver called -- this is prone to deadlocks and generally
   should be avoided

 * rfkill-input pointlessly is a separate module

 * drivers need to #ifdef rfkill functions (unless they want to
   depend on or select RFKILL) -- rfkill should provide inlines
   that do nothing if it isn't compiled in

 * the rfkill structure is not opaque -- drivers need to initialise
   it correctly (lots of sanity checking code required) -- instead
   force drivers to pass the right variables to rfkill_alloc()

 * the documentation is hard to read because it always assumes the
   reader is completely clueless and contains way TOO MANY CAPS

 * the rfkill code needlessly uses a lot of locks and atomic
   operations in locked sections

 * fix LED trigger to actually change the LED when the radio state
   changes -- this wasn't done before

Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> [thinkpad]
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 29 insertions, 70 deletions

diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index 353a898c3693..1208d0cedd15 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -299,39 +299,22 @@ static int update_bl_status(struct backlight_device *bd)
  * Rfkill helpers
  */
 
-static int eeepc_wlan_rfkill_set(void *data, enum rfkill_state state)
-{
-	if (state == RFKILL_STATE_SOFT_BLOCKED)
-		return set_acpi(CM_ASL_WLAN, 0);
-	else
-		return set_acpi(CM_ASL_WLAN, 1);
-}
-
-static int eeepc_wlan_rfkill_state(void *data, enum rfkill_state *state)
+static bool eeepc_wlan_rfkill_blocked(void)
 {
 	if (get_acpi(CM_ASL_WLAN) == 1)
-		*state = RFKILL_STATE_UNBLOCKED;
-	else
-		*state = RFKILL_STATE_SOFT_BLOCKED;
-	return 0;
+		return false;
+	return true;
 }
 
-static int eeepc_bluetooth_rfkill_set(void *data, enum rfkill_state state)
+static int eeepc_rfkill_set(void *data, bool blocked)
 {
-	if (state == RFKILL_STATE_SOFT_BLOCKED)
-		return set_acpi(CM_ASL_BLUETOOTH, 0);
-	else
-		return set_acpi(CM_ASL_BLUETOOTH, 1);
+	unsigned long asl = (unsigned long)data;
+	return set_acpi(asl, !blocked);
 }
 
-static int eeepc_bluetooth_rfkill_state(void *data, enum rfkill_state *state)
-{
-	if (get_acpi(CM_ASL_BLUETOOTH) == 1)
-		*state = RFKILL_STATE_UNBLOCKED;
-	else
-		*state = RFKILL_STATE_SOFT_BLOCKED;
-	return 0;
-}
+static const struct rfkill_ops eeepc_rfkill_ops = {
+	.set_block = eeepc_rfkill_set,
+};
 
 /*
  * Sys helpers
@@ -531,9 +514,9 @@ static int notify_brn(void)
 
 static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
 {
-	enum rfkill_state state;
 	struct pci_dev *dev;
 	struct pci_bus *bus = pci_find_bus(0, 1);
+	bool blocked;
 
 	if (event != ACPI_NOTIFY_BUS_CHECK)
 		return;
@@ -543,9 +526,8 @@ static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
 		return;
 	}
 
-	eeepc_wlan_rfkill_state(ehotk->eeepc_wlan_rfkill, &state);
-
-	if (state == RFKILL_STATE_UNBLOCKED) {
+	blocked = eeepc_wlan_rfkill_blocked();
+	if (!blocked) {
 		dev = pci_get_slot(bus, 0);
 		if (dev) {
 			/* Device already present */
@@ -566,7 +548,7 @@ static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
 		}
 	}
 
-	rfkill_force_state(ehotk->eeepc_wlan_rfkill, state);
+	rfkill_set_sw_state(ehotk->eeepc_wlan_rfkill, blocked);
 }
 
 static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
@@ -684,26 +666,17 @@ static int eeepc_hotk_add(struct acpi_device *device)
 	eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7");
 
 	if (get_acpi(CM_ASL_WLAN) != -1) {
-		ehotk->eeepc_wlan_rfkill = rfkill_allocate(&device->dev,
-							   RFKILL_TYPE_WLAN);
+		ehotk->eeepc_wlan_rfkill = rfkill_alloc("eeepc-wlan",
+							&device->dev,
+							RFKILL_TYPE_WLAN,
+							&eeepc_rfkill_ops,
+							(void *)CM_ASL_WLAN);
 
 		if (!ehotk->eeepc_wlan_rfkill)
 			goto wlan_fail;
 
-		ehotk->eeepc_wlan_rfkill->name = "eeepc-wlan";
-		ehotk->eeepc_wlan_rfkill->toggle_radio = eeepc_wlan_rfkill_set;
-		ehotk->eeepc_wlan_rfkill->get_state = eeepc_wlan_rfkill_state;
-		if (get_acpi(CM_ASL_WLAN) == 1) {
-			ehotk->eeepc_wlan_rfkill->state =
-				RFKILL_STATE_UNBLOCKED;
-			rfkill_set_default(RFKILL_TYPE_WLAN,
-					   RFKILL_STATE_UNBLOCKED);
-		} else {
-			ehotk->eeepc_wlan_rfkill->state =
-				RFKILL_STATE_SOFT_BLOCKED;
-			rfkill_set_default(RFKILL_TYPE_WLAN,
-					   RFKILL_STATE_SOFT_BLOCKED);
-		}
+		rfkill_set_global_sw_state(RFKILL_TYPE_WLAN,
+					   get_acpi(CM_ASL_WLAN) != 1);
 		result = rfkill_register(ehotk->eeepc_wlan_rfkill);
 		if (result)
 			goto wlan_fail;
@@ -711,28 +684,17 @@ static int eeepc_hotk_add(struct acpi_device *device)
 
 	if (get_acpi(CM_ASL_BLUETOOTH) != -1) {
 		ehotk->eeepc_bluetooth_rfkill =
-			rfkill_allocate(&device->dev, RFKILL_TYPE_BLUETOOTH);
+			rfkill_alloc("eeepc-bluetooth",
+				     &device->dev,
+				     RFKILL_TYPE_BLUETOOTH,
+				     &eeepc_rfkill_ops,
+				     (void *)CM_ASL_BLUETOOTH);
 
 		if (!ehotk->eeepc_bluetooth_rfkill)
 			goto bluetooth_fail;
 
-		ehotk->eeepc_bluetooth_rfkill->name = "eeepc-bluetooth";
-		ehotk->eeepc_bluetooth_rfkill->toggle_radio =
-			eeepc_bluetooth_rfkill_set;
-		ehotk->eeepc_bluetooth_rfkill->get_state =
-			eeepc_bluetooth_rfkill_state;
-		if (get_acpi(CM_ASL_BLUETOOTH) == 1) {
-			ehotk->eeepc_bluetooth_rfkill->state =
-				RFKILL_STATE_UNBLOCKED;
-			rfkill_set_default(RFKILL_TYPE_BLUETOOTH,
-					   RFKILL_STATE_UNBLOCKED);
-		} else {
-			ehotk->eeepc_bluetooth_rfkill->state =
-				RFKILL_STATE_SOFT_BLOCKED;
-			rfkill_set_default(RFKILL_TYPE_BLUETOOTH,
-					   RFKILL_STATE_SOFT_BLOCKED);
-		}
-
+		rfkill_set_global_sw_state(RFKILL_TYPE_BLUETOOTH,
+					   get_acpi(CM_ASL_BLUETOOTH) != 1);
 		result = rfkill_register(ehotk->eeepc_bluetooth_rfkill);
 		if (result)
 			goto bluetooth_fail;
@@ -741,13 +703,10 @@ static int eeepc_hotk_add(struct acpi_device *device)
 	return 0;
 
  bluetooth_fail:
-	if (ehotk->eeepc_bluetooth_rfkill)
-		rfkill_free(ehotk->eeepc_bluetooth_rfkill);
+	rfkill_destroy(ehotk->eeepc_bluetooth_rfkill);
 	rfkill_unregister(ehotk->eeepc_wlan_rfkill);
-	ehotk->eeepc_wlan_rfkill = NULL;
  wlan_fail:
-	if (ehotk->eeepc_wlan_rfkill)
-		rfkill_free(ehotk->eeepc_wlan_rfkill);
+	rfkill_destroy(ehotk->eeepc_wlan_rfkill);
 	eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P6");
 	eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P7");
  ehotk_fail: