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, 22 insertions, 28 deletions

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 62d02b3c998..b618fa51db2 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -958,58 +958,50 @@ static void acer_rfkill_update(struct work_struct *ignored)
 
 	status = get_u32(&state, ACER_CAP_WIRELESS);
 	if (ACPI_SUCCESS(status))
-		rfkill_force_state(wireless_rfkill, state ?
-			RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED);
+		rfkill_set_sw_state(wireless_rfkill, !!state);
 
 	if (has_cap(ACER_CAP_BLUETOOTH)) {
 		status = get_u32(&state, ACER_CAP_BLUETOOTH);
 		if (ACPI_SUCCESS(status))
-			rfkill_force_state(bluetooth_rfkill, state ?
-				RFKILL_STATE_UNBLOCKED :
-				RFKILL_STATE_SOFT_BLOCKED);
+			rfkill_set_sw_state(bluetooth_rfkill, !!state);
 	}
 
 	schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
 }
 
-static int acer_rfkill_set(void *data, enum rfkill_state state)
+static int acer_rfkill_set(void *data, bool blocked)
 {
 	acpi_status status;
-	u32 *cap = data;
-	status = set_u32((u32) (state == RFKILL_STATE_UNBLOCKED), *cap);
+	u32 cap = (unsigned long)data;
+	status = set_u32(!!blocked, cap);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
 	return 0;
 }
 
-static struct rfkill * acer_rfkill_register(struct device *dev,
-enum rfkill_type type, char *name, u32 cap)
+static const struct rfkill_ops acer_rfkill_ops = {
+	.set_block = acer_rfkill_set,
+};
+
+static struct rfkill *acer_rfkill_register(struct device *dev,
+					   enum rfkill_type type,
+					   char *name, u32 cap)
 {
 	int err;
 	u32 state;
-	u32 *data;
 	struct rfkill *rfkill_dev;
 
-	rfkill_dev = rfkill_allocate(dev, type);
+	rfkill_dev = rfkill_alloc(name, dev, type,
+				  &acer_rfkill_ops,
+				  (void *)(unsigned long)cap);
 	if (!rfkill_dev)
 		return ERR_PTR(-ENOMEM);
-	rfkill_dev->name = name;
 	get_u32(&state, cap);
-	rfkill_dev->state = state ? RFKILL_STATE_UNBLOCKED :
-		RFKILL_STATE_SOFT_BLOCKED;
-	data = kzalloc(sizeof(u32), GFP_KERNEL);
-	if (!data) {
-		rfkill_free(rfkill_dev);
-		return ERR_PTR(-ENOMEM);
-	}
-	*data = cap;
-	rfkill_dev->data = data;
-	rfkill_dev->toggle_radio = acer_rfkill_set;
+	rfkill_set_sw_state(rfkill_dev, !state);
 
 	err = rfkill_register(rfkill_dev);
 	if (err) {
-		kfree(rfkill_dev->data);
-		rfkill_free(rfkill_dev);
+		rfkill_destroy(rfkill_dev);
 		return ERR_PTR(err);
 	}
 	return rfkill_dev;
@@ -1027,8 +1019,8 @@ static int acer_rfkill_init(struct device *dev)
 			RFKILL_TYPE_BLUETOOTH, "acer-bluetooth",
 			ACER_CAP_BLUETOOTH);
 		if (IS_ERR(bluetooth_rfkill)) {
-			kfree(wireless_rfkill->data);
 			rfkill_unregister(wireless_rfkill);
+			rfkill_destroy(wireless_rfkill);
 			return PTR_ERR(bluetooth_rfkill);
 		}
 	}
@@ -1041,11 +1033,13 @@ static int acer_rfkill_init(struct device *dev)
 static void acer_rfkill_exit(void)
 {
 	cancel_delayed_work_sync(&acer_rfkill_work);
-	kfree(wireless_rfkill->data);
+
 	rfkill_unregister(wireless_rfkill);
+	rfkill_destroy(wireless_rfkill);
+
 	if (has_cap(ACER_CAP_BLUETOOTH)) {
-		kfree(bluetooth_rfkill->data);
 		rfkill_unregister(bluetooth_rfkill);
+		rfkill_destroy(bluetooth_rfkill);
 	}
 	return;
 }