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, 52 insertions, 51 deletions

diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index fe171fad12c..8d931145cbf 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -154,58 +154,46 @@ static int hp_wmi_dock_state(void)
 	return hp_wmi_perform_query(HPWMI_DOCK_QUERY, 0, 0);
 }
 
-static int hp_wmi_wifi_set(void *data, enum rfkill_state state)
+static int hp_wmi_set_block(void *data, bool blocked)
 {
-	if (state)
-		return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x101);
-	else
-		return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x100);
-}
+	unsigned long b = (unsigned long) data;
+	int query = BIT(b + 8) | ((!!blocked) << b);
 
-static int hp_wmi_bluetooth_set(void *data, enum rfkill_state state)
-{
-	if (state)
-		return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x202);
-	else
-		return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x200);
+	return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
 }
 
-static int hp_wmi_wwan_set(void *data, enum rfkill_state state)
-{
-	if (state)
-		return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x404);
-	else
-		return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x400);
-}
+static const struct rfkill_ops hp_wmi_rfkill_ops = {
+	.set_block = hp_wmi_set_block,
+};
 
-static int hp_wmi_wifi_state(void)
+static bool hp_wmi_wifi_state(void)
 {
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	if (wireless & 0x100)
-		return RFKILL_STATE_UNBLOCKED;
+		return false;
 	else
-		return RFKILL_STATE_SOFT_BLOCKED;
+		return true;
 }
 
-static int hp_wmi_bluetooth_state(void)
+static bool hp_wmi_bluetooth_state(void)
 {
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	if (wireless & 0x10000)
-		return RFKILL_STATE_UNBLOCKED;
+		return false;
 	else
-		return RFKILL_STATE_SOFT_BLOCKED;
+		return true;
 }
 
-static int hp_wmi_wwan_state(void)
+static bool hp_wmi_wwan_state(void)
 {
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 
 	if (wireless & 0x1000000)
-		return RFKILL_STATE_UNBLOCKED;
+		return false;
 	else
-		return RFKILL_STATE_SOFT_BLOCKED;
+		return true;
 }
 
 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
@@ -347,14 +335,14 @@ static void hp_wmi_notify(u32 value, void *context)
 			}
 		} else if (eventcode == 0x5) {
 			if (wifi_rfkill)
-				rfkill_force_state(wifi_rfkill,
-						   hp_wmi_wifi_state());
+				rfkill_set_sw_state(wifi_rfkill,
+						    hp_wmi_wifi_state());
 			if (bluetooth_rfkill)
-				rfkill_force_state(bluetooth_rfkill,
-						   hp_wmi_bluetooth_state());
+				rfkill_set_sw_state(bluetooth_rfkill,
+						    hp_wmi_bluetooth_state());
 			if (wwan_rfkill)
-				rfkill_force_state(wwan_rfkill,
-						   hp_wmi_wwan_state());
+				rfkill_set_sw_state(wwan_rfkill,
+						    hp_wmi_wwan_state());
 		} else
 			printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 			       eventcode);
@@ -430,31 +418,34 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 		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 = rfkill_alloc("hp-wifi", &device->dev,
+					   RFKILL_TYPE_WLAN,
+					   &hp_wmi_rfkill_ops,
+					   (void *) 0);
+		rfkill_set_sw_state(wifi_rfkill, hp_wmi_wifi_state());
 		err = rfkill_register(wifi_rfkill);
 		if (err)
-			goto add_sysfs_error;
+			goto register_wifi_error;
 	}
 
 	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 = rfkill_alloc("hp-bluetooth", &device->dev,
+						RFKILL_TYPE_BLUETOOTH,
+						&hp_wmi_rfkill_ops,
+						(void *) 1);
+		rfkill_set_sw_state(bluetooth_rfkill,
+				    hp_wmi_bluetooth_state());
 		err = rfkill_register(bluetooth_rfkill);
 		if (err)
 			goto register_bluetooth_error;
 	}
 
 	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 = rfkill_alloc("hp-wwan", &device->dev,
+					   RFKILL_TYPE_WWAN,
+					   &hp_wmi_rfkill_ops,
+					   (void *) 2);
+		rfkill_set_sw_state(wwan_rfkill, hp_wmi_wwan_state());
 		err = rfkill_register(wwan_rfkill);
 		if (err)
 			goto register_wwan_err;
@@ -462,11 +453,15 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 
 	return 0;
 register_wwan_err:
+	rfkill_destroy(wwan_rfkill);
 	if (bluetooth_rfkill)
 		rfkill_unregister(bluetooth_rfkill);
 register_bluetooth_error:
+	rfkill_destroy(bluetooth_rfkill);
 	if (wifi_rfkill)
 		rfkill_unregister(wifi_rfkill);
+register_wifi_error:
+	rfkill_destroy(wifi_rfkill);
 add_sysfs_error:
 	cleanup_sysfs(device);
 	return err;
@@ -476,12 +471,18 @@ static int __exit hp_wmi_bios_remove(struct platform_device *device)
 {
 	cleanup_sysfs(device);
 
-	if (wifi_rfkill)
+	if (wifi_rfkill) {
 		rfkill_unregister(wifi_rfkill);
-	if (bluetooth_rfkill)
+		rfkill_destroy(wifi_rfkill);
+	}
+	if (bluetooth_rfkill) {
 		rfkill_unregister(bluetooth_rfkill);
-	if (wwan_rfkill)
+		rfkill_destroy(wifi_rfkill);
+	}
+	if (wwan_rfkill) {
 		rfkill_unregister(wwan_rfkill);
+		rfkill_destroy(wwan_rfkill);
+	}
 
 	return 0;
 }