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, 17 insertions, 22 deletions

diff --git a/drivers/net/wireless/iwmc3200wifi/rfkill.c b/drivers/net/wireless/iwmc3200wifi/rfkill.c
index 4ca8b49..8ee2c3c 100644
--- a/drivers/net/wireless/iwmc3200wifi/rfkill.c
+++ b/drivers/net/wireless/iwmc3200wifi/rfkill.c
@@ -25,47 +25,42 @@
 
 #include "iwm.h"
 
-static int iwm_rfkill_soft_toggle(void *data, enum rfkill_state state)
+static int iwm_rfkill_set_block(void *data, bool blocked)
 {
 	struct iwm_priv *iwm = data;
 
-	switch (state) {
-	case RFKILL_STATE_UNBLOCKED:
+	if (!blocked) {
 		if (test_bit(IWM_RADIO_RFKILL_HW, &iwm->radio))
 			return -EBUSY;
 
 		if (test_and_clear_bit(IWM_RADIO_RFKILL_SW, &iwm->radio) &&
 		    (iwm_to_ndev(iwm)->flags & IFF_UP))
-			iwm_up(iwm);
-
-		break;
-	case RFKILL_STATE_SOFT_BLOCKED:
+			return iwm_up(iwm);
+	} else {
 		if (!test_and_set_bit(IWM_RADIO_RFKILL_SW, &iwm->radio))
-			iwm_down(iwm);
-
-		break;
-	default:
-		break;
+			return iwm_down(iwm);
 	}
 
 	return 0;
 }
 
+static const struct rfkill_ops iwm_rfkill_ops = {
+	.set_block = iwm_rfkill_set_block,
+};
+
 int iwm_rfkill_init(struct iwm_priv *iwm)
 {
 	int ret;
 
-	iwm->rfkill = rfkill_allocate(iwm_to_dev(iwm), RFKILL_TYPE_WLAN);
+	iwm->rfkill = rfkill_alloc(KBUILD_MODNAME,
+				   iwm_to_dev(iwm),
+				   RFKILL_TYPE_WLAN,
+				   &iwm_rfkill_ops, iwm);
 	if (!iwm->rfkill) {
 		IWM_ERR(iwm, "Unable to allocate rfkill device\n");
 		return -ENOMEM;
 	}
 
-	iwm->rfkill->name = KBUILD_MODNAME;
-	iwm->rfkill->data = iwm;
-	iwm->rfkill->state = RFKILL_STATE_UNBLOCKED;
-	iwm->rfkill->toggle_radio = iwm_rfkill_soft_toggle;
-
 	ret = rfkill_register(iwm->rfkill);
 	if (ret) {
 		IWM_ERR(iwm, "Failed to register rfkill device\n");
@@ -74,15 +69,15 @@ int iwm_rfkill_init(struct iwm_priv *iwm)
 
 	return 0;
  fail:
-	rfkill_free(iwm->rfkill);
+	rfkill_destroy(iwm->rfkill);
 	return ret;
 }
 
 void iwm_rfkill_exit(struct iwm_priv *iwm)
 {
-	if (iwm->rfkill)
+	if (iwm->rfkill) {
 		rfkill_unregister(iwm->rfkill);
-
-	rfkill_free(iwm->rfkill);
+		rfkill_destroy(iwm->rfkill);
+	}
 	iwm->rfkill = NULL;
 }