rfkill: add default global states (v2)

Add a second set of global states, "rfkill_default_states", to track the
state that will be used when the first rfkill class of a given type is
registered, and also to save "undo" information when rfkill_epo is called.

Add a new exported function, rfkill_set_default(), which can be used by
platform drivers to restore radio state saved by the platform across
reboots or shutdown.

Also, fix rfkill_epo to properly update rfkill_states, but still preserve a
copy of the state so that we can undo the effect of rfkill_epo later if we
want to.  Add rfkill_restore_states() to restore rfkill_states from the
copy.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 117 insertions, 12 deletions

diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h
index 741d1a62cc3f..aa3c7d5852f6 100644
--- a/include/linux/rfkill.h
+++ b/include/linux/rfkill.h
@@ -116,6 +116,7 @@ int rfkill_register(struct rfkill *rfkill);
 void rfkill_unregister(struct rfkill *rfkill);
 
 int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state);
+int rfkill_set_default(enum rfkill_type type, enum rfkill_state state);
 
 /**
  * rfkill_state_complement - return complementar state
diff --git a/net/rfkill/rfkill-input.h b/net/rfkill/rfkill-input.h
index f63d05045685..bbfa646157c6 100644
--- a/net/rfkill/rfkill-input.h
+++ b/net/rfkill/rfkill-input.h
@@ -13,5 +13,6 @@
 
 void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state);
 void rfkill_epo(void);
+void rfkill_restore_states(void);
 
 #endif /* __RFKILL_INPUT_H */
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 1f23de20a85e..b995fa32cf84 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -44,7 +44,13 @@ module_param_named(default_state, rfkill_default_state, uint, 0444);
 MODULE_PARM_DESC(default_state,
                  "Default initial state for all radio types, 0 = radio off");
 
-static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
+struct rfkill_gsw_state {
+        enum rfkill_state current_state;
+        enum rfkill_state default_state;
+};
+
+static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX];
+static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
 
 static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
 
@@ -213,22 +219,22 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
 }
 
 /**
- * rfkill_switch_all - Toggle state of all switches of given type
+ * __rfkill_switch_all - Toggle state of all switches of given type
  * @type: type of interfaces to be affected
  * @state: the new state
  *
  * This function toggles the state of all switches of given type,
  * unless a specific switch is claimed by userspace (in which case,
  * that switch is left alone) or suspended.
+ *
+ * Caller must have acquired rfkill_mutex.
  */
-void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
+static void __rfkill_switch_all(const enum rfkill_type type,
+                                const enum rfkill_state state)
 {
         struct rfkill *rfkill;
 
-        mutex_lock(&rfkill_mutex);
-
-        rfkill_states[type] = state;
-
+        rfkill_global_states[type].current_state = state;
         list_for_each_entry(rfkill, &rfkill_list, node) {
                 if ((!rfkill->user_claim) && (rfkill->type == type)) {
                         mutex_lock(&rfkill->mutex);
@@ -236,7 +242,20 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
                         mutex_unlock(&rfkill->mutex);
                 }
         }
+}
 
+/**
+ * rfkill_switch_all - Toggle state of all switches of given type
+ * @type: type of interfaces to be affected
+ * @state: the new state
+ *
+ * Acquires rfkill_mutex and calls __rfkill_switch_all(@type, @state).
+ * Please refer to __rfkill_switch_all() for details.
+ */
+void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
+{
+        mutex_lock(&rfkill_mutex);
+        __rfkill_switch_all(type, state);
         mutex_unlock(&rfkill_mutex);
 }
 EXPORT_SYMBOL(rfkill_switch_all);
@@ -246,10 +265,14 @@ EXPORT_SYMBOL(rfkill_switch_all);
  *
  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
  * ignoring everything in its path but rfkill_mutex and rfkill->mutex.
+ *
+ * The global state before the EPO is saved and can be restored later
+ * using rfkill_restore_states().
  */
 void rfkill_epo(void)
 {
         struct rfkill *rfkill;
+        int i;
 
         mutex_lock(&rfkill_mutex);
         list_for_each_entry(rfkill, &rfkill_list, node) {
@@ -257,11 +280,35 @@ void rfkill_epo(void)
                 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
                 mutex_unlock(&rfkill->mutex);
         }
+        for (i = 0; i < RFKILL_TYPE_MAX; i++) {
+                rfkill_global_states[i].default_state =
+                                rfkill_global_states[i].current_state;
+                rfkill_global_states[i].current_state =
+                                RFKILL_STATE_SOFT_BLOCKED;
+        }
         mutex_unlock(&rfkill_mutex);
 }
 EXPORT_SYMBOL_GPL(rfkill_epo);
 
 /**
+ * rfkill_restore_states - restore global states
+ *
+ * Restore (and sync switches to) the global state from the
+ * states in rfkill_default_states.  This can undo the effects of
+ * a call to rfkill_epo().
+ */
+void rfkill_restore_states(void)
+{
+        int i;
+
+        mutex_lock(&rfkill_mutex);
+        for (i = 0; i < RFKILL_TYPE_MAX; i++)
+                __rfkill_switch_all(i, rfkill_global_states[i].default_state);
+        mutex_unlock(&rfkill_mutex);
+}
+EXPORT_SYMBOL_GPL(rfkill_restore_states);
+
+/**
  * rfkill_force_state - Force the internal rfkill radio state
  * @rfkill: pointer to the rfkill class to modify.
  * @state: the current radio state the class should be forced to.
@@ -406,8 +453,8 @@ static ssize_t rfkill_claim_store(struct device *dev,
                 if (!claim) {
                         mutex_lock(&rfkill->mutex);
                         rfkill_toggle_radio(rfkill,
-                                            rfkill_states[rfkill->type],
-                                            0);
+                                        rfkill_global_states[rfkill->type].current_state,
+                                        0);
                         mutex_unlock(&rfkill->mutex);
                 }
                 rfkill->user_claim = claim;
@@ -554,7 +601,16 @@ static int rfkill_add_switch(struct rfkill *rfkill)
         if (error < 0)
                 goto unlock_out;
 
-        rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
+        if (!error) {
+                /* lock default after first use */
+                set_bit(rfkill->type, rfkill_states_lockdflt);
+                rfkill_global_states[rfkill->type].current_state =
+                        rfkill_global_states[rfkill->type].default_state;
+        }
+
+        rfkill_toggle_radio(rfkill,
+                            rfkill_global_states[rfkill->type].current_state,
+                            0);
 
         list_add_tail(&rfkill->node, &rfkill_list);
 
@@ -710,6 +766,53 @@ void rfkill_unregister(struct rfkill *rfkill)
 }
 EXPORT_SYMBOL(rfkill_unregister);
 
+/**
+ * rfkill_set_default - set initial value for a switch type
+ * @type - the type of switch to set the default state of
+ * @state - the new default state for that group of switches
+ *
+ * Sets the initial state rfkill should use for a given type.
+ * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
+ * and RFKILL_STATE_UNBLOCKED.
+ *
+ * This function is meant to be used by platform drivers for platforms
+ * that can save switch state across power down/reboot.
+ *
+ * The default state for each switch type can be changed exactly once.
+ * After a switch of that type is registered, the default state cannot
+ * be changed anymore.  This guards against multiple drivers it the
+ * same platform trying to set the initial switch default state, which
+ * is not allowed.
+ *
+ * Returns -EPERM if the state has already been set once or is in use,
+ * so drivers likely want to either ignore or at most printk(KERN_NOTICE)
+ * if this function returns -EPERM.
+ *
+ * Returns 0 if the new default state was set, or an error if it
+ * could not be set.
+ */
+int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
+{
+        int error;
+
+        if (type >= RFKILL_TYPE_MAX ||
+            (state != RFKILL_STATE_SOFT_BLOCKED &&
+             state != RFKILL_STATE_UNBLOCKED))
+                return -EINVAL;
+
+        mutex_lock(&rfkill_mutex);
+
+        if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
+                rfkill_global_states[type].default_state = state;
+                error = 0;
+        } else
+                error = -EPERM;
+
+        mutex_unlock(&rfkill_mutex);
+        return error;
+}
+EXPORT_SYMBOL_GPL(rfkill_set_default);
+
 /*
  * Rfkill module initialization/deinitialization.
  */
@@ -723,8 +826,8 @@ static int __init rfkill_init(void)
             rfkill_default_state != RFKILL_STATE_UNBLOCKED)
                 return -EINVAL;
 
-        for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
-                rfkill_states[i] = rfkill_default_state;
+        for (i = 0; i < RFKILL_TYPE_MAX; i++)
+                rfkill_global_states[i].default_state = rfkill_default_state;
 
         error = class_register(&rfkill_class);
         if (error) {