rfkill: remove user_claim stuff

Almost all drivers do not support user_claim, so remove it
completely and always report -EOPNOTSUPP to userspace. Since
userspace cannot really drive rfkill _anyway_ (due to the
odd restrictions imposed by the documentation) having this
code is just pointless.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

Documentation/rfkill.txt

@@ -521,16 +521,12 @@ status of the system.
 Input devices may issue events that are related to rfkill.  These are the
 various KEY_* events and SW_* events supported by rfkill-input.c.
 
-******IMPORTANT******
-When rfkill-input is ACTIVE, userspace is NOT TO CHANGE THE STATE OF AN RFKILL
-SWITCH IN RESPONSE TO AN INPUT EVENT also handled by rfkill-input, unless it
-has set to true the user_claim attribute for that particular switch.  This rule
-is *absolute*; do NOT violate it.
-******IMPORTANT******
+Userspace may not change the state of an rfkill switch in response to an
+input event, it should refrain from changing states entirely.
 
-Userspace must not assume it is the only source of control for rfkill switches.
-Their state CAN and WILL change due to firmware actions, direct user actions,
-and the rfkill-input EPO override for *_RFKILL_ALL.
+Userspace cannot assume it is the only source of control for rfkill switches.
+Their state can change due to firmware actions, direct user actions, and the
+rfkill-input EPO override for *_RFKILL_ALL.
 
 When rfkill-input is not active, userspace must initiate a rfkill status
 change by writing to the "state" attribute in order for anything to happen.

drivers/net/wireless/ath9k/main.c

@@ -1267,7 +1267,6 @@ static int ath_init_sw_rfkill(struct ath_softc *sc)
 	sc->rf_kill.rfkill->data = sc;
 	sc->rf_kill.rfkill->toggle_radio = ath_sw_toggle_radio;
 	sc->rf_kill.rfkill->state = RFKILL_STATE_UNBLOCKED;
-	sc->rf_kill.rfkill->user_claim_unsupported = 1;
 
 	return 0;
 }

drivers/net/wireless/b43/rfkill.c

@@ -139,7 +139,6 @@ void b43_rfkill_init(struct b43_wldev *dev)
 	rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
 	rfk->rfkill->data = dev;
 	rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
-	rfk->rfkill->user_claim_unsupported = 1;
 
 	rfk->poll_dev = input_allocate_polled_device();
 	if (!rfk->poll_dev) {

drivers/net/wireless/b43legacy/rfkill.c

@@ -142,7 +142,6 @@ void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
 	rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
 	rfk->rfkill->data = dev;
 	rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
-	rfk->rfkill->user_claim_unsupported = 1;
 
 	rfk->poll_dev = input_allocate_polled_device();
 	if (!rfk->poll_dev) {

drivers/net/wireless/iwlwifi/iwl-rfkill.c

@@ -91,7 +91,6 @@ int iwl_rfkill_init(struct iwl_priv *priv)
 	priv->rfkill->data = priv;
 	priv->rfkill->state = RFKILL_STATE_UNBLOCKED;
 	priv->rfkill->toggle_radio = iwl_rfkill_soft_rf_kill;
-	priv->rfkill->user_claim_unsupported = 1;
 
 	priv->rfkill->dev.class->suspend = NULL;
 	priv->rfkill->dev.class->resume = NULL;

drivers/platform/x86/acer-wmi.c

@@ -1005,7 +1005,6 @@ enum rfkill_type type, char *name, u32 cap)
 	*data = cap;
 	rfkill_dev->data = data;
 	rfkill_dev->toggle_radio = acer_rfkill_set;
-	rfkill_dev->user_claim_unsupported = 1;
 
 	err = rfkill_register(rfkill_dev);
 	if (err) {

drivers/platform/x86/hp-wmi.c

@@ -434,7 +434,6 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 		wifi_rfkill->name = "hp-wifi";
 		wifi_rfkill->state = hp_wmi_wifi_state();
 		wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
-		wifi_rfkill->user_claim_unsupported = 1;
 		err = rfkill_register(wifi_rfkill);
 		if (err)
 			goto add_sysfs_error;
@@ -446,7 +445,6 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 		bluetooth_rfkill->name = "hp-bluetooth";
 		bluetooth_rfkill->state = hp_wmi_bluetooth_state();
 		bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
-		bluetooth_rfkill->user_claim_unsupported = 1;
 		err = rfkill_register(bluetooth_rfkill);
 		if (err)
 			goto register_bluetooth_error;
@@ -457,7 +455,6 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 		wwan_rfkill->name = "hp-wwan";
 		wwan_rfkill->state = hp_wmi_wwan_state();
 		wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
-		wwan_rfkill->user_claim_unsupported = 1;
 		err = rfkill_register(wwan_rfkill);
 		if (err)
 			goto register_wwan_err;

drivers/platform/x86/sony-laptop.c

@@ -1097,7 +1097,6 @@ static int sony_nc_setup_wifi_rfkill(struct acpi_device *device)
 	sony_wifi_rfkill->name = "sony-wifi";
 	sony_wifi_rfkill->toggle_radio = sony_nc_rfkill_set;
 	sony_wifi_rfkill->get_state = sony_nc_rfkill_get;
-	sony_wifi_rfkill->user_claim_unsupported = 1;
 	sony_wifi_rfkill->data = (void *)SONY_WIFI;
 	err = rfkill_register(sony_wifi_rfkill);
 	if (err)
@@ -1119,7 +1118,6 @@ static int sony_nc_setup_bluetooth_rfkill(struct acpi_device *device)
 	sony_bluetooth_rfkill->name = "sony-bluetooth";
 	sony_bluetooth_rfkill->toggle_radio = sony_nc_rfkill_set;
 	sony_bluetooth_rfkill->get_state = sony_nc_rfkill_get;
-	sony_bluetooth_rfkill->user_claim_unsupported = 1;
 	sony_bluetooth_rfkill->data = (void *)SONY_BLUETOOTH;
 	err = rfkill_register(sony_bluetooth_rfkill);
 	if (err)
@@ -1140,7 +1138,6 @@ static int sony_nc_setup_wwan_rfkill(struct acpi_device *device)
 	sony_wwan_rfkill->name = "sony-wwan";
 	sony_wwan_rfkill->toggle_radio = sony_nc_rfkill_set;
 	sony_wwan_rfkill->get_state = sony_nc_rfkill_get;
-	sony_wwan_rfkill->user_claim_unsupported = 1;
 	sony_wwan_rfkill->data = (void *)SONY_WWAN;
 	err = rfkill_register(sony_wwan_rfkill);
 	if (err)
@@ -1161,7 +1158,6 @@ static int sony_nc_setup_wimax_rfkill(struct acpi_device *device)
 	sony_wimax_rfkill->name = "sony-wimax";
 	sony_wimax_rfkill->toggle_radio = sony_nc_rfkill_set;
 	sony_wimax_rfkill->get_state = sony_nc_rfkill_get;
-	sony_wimax_rfkill->user_claim_unsupported = 1;
 	sony_wimax_rfkill->data = (void *)SONY_WIMAX;
 	err = rfkill_register(sony_wimax_rfkill);
 	if (err)

drivers/platform/x86/toshiba_acpi.c

@@ -803,7 +803,6 @@ static int __init toshiba_acpi_init(void)
 
 		toshiba_acpi.rfk_dev->name = toshiba_acpi.bt_name;
 		toshiba_acpi.rfk_dev->toggle_radio = bt_rfkill_toggle_radio;
-		toshiba_acpi.rfk_dev->user_claim_unsupported = 1;
 		toshiba_acpi.rfk_dev->data = &toshiba_acpi;
 
 		if (hci_get_bt_on(&bt_on) == HCI_SUCCESS && bt_on) {

include/linux/rfkill.h

@@ -58,9 +58,6 @@ enum rfkill_state {
  * @type: Radio type which the button controls, the value stored
  *	here should be a value from enum rfkill_type.
  * @state: State of the switch, "UNBLOCKED" means radio can operate.
- * @user_claim_unsupported: Whether the hardware supports exclusive
- *	RF-kill control by userspace. Set this before registering.
- * @user_claim: Set when the switch is controlled exlusively by userspace.
  * @mutex: Guards switch state transitions.  It serializes callbacks
  *	and also protects the state.
  * @data: Pointer to the RF button drivers private data which will be
@@ -83,9 +80,6 @@ struct rfkill {
 	const char *name;
 	enum rfkill_type type;
 
-	bool user_claim_unsupported;
-	bool user_claim;
-
 	/* the mutex serializes callbacks and also protects
 	 * the state */
 	struct mutex mutex;

net/rfkill/rfkill.c

@@ -200,7 +200,7 @@ static void __rfkill_switch_all(const enum rfkill_type type,
 
 	rfkill_global_states[type].current_state = state;
 	list_for_each_entry(rfkill, &rfkill_list, node) {
-		if ((!rfkill->user_claim) && (rfkill->type == type)) {
+		if (rfkill->type == type) {
 			mutex_lock(&rfkill->mutex);
 			rfkill_toggle_radio(rfkill, state, 0);
 			mutex_unlock(&rfkill->mutex);
@@ -447,53 +447,14 @@ static ssize_t rfkill_claim_show(struct device *dev,
 				 struct device_attribute *attr,
 				 char *buf)
 {
-	struct rfkill *rfkill = to_rfkill(dev);
-
-	return sprintf(buf, "%d\n", rfkill->user_claim);
+	return sprintf(buf, "%d\n", 0);
 }
 
 static ssize_t rfkill_claim_store(struct device *dev,
 				  struct device_attribute *attr,
 				  const char *buf, size_t count)
 {
-	struct rfkill *rfkill = to_rfkill(dev);
-	unsigned long claim_tmp;
-	bool claim;
-	int error;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	if (rfkill->user_claim_unsupported)
-		return -EOPNOTSUPP;
-
-	error = strict_strtoul(buf, 0, &claim_tmp);
-	if (error)
-		return error;
-	claim = !!claim_tmp;
-
-	/*
-	 * Take the global lock to make sure the kernel is not in
-	 * the middle of rfkill_switch_all
-	 */
-	error = mutex_lock_killable(&rfkill_global_mutex);
-	if (error)
-		return error;
-
-	if (rfkill->user_claim != claim) {
-		if (!claim && !rfkill_epo_lock_active) {
-			mutex_lock(&rfkill->mutex);
-			rfkill_toggle_radio(rfkill,
-					rfkill_global_states[rfkill->type].current_state,
-					0);
-			mutex_unlock(&rfkill->mutex);
-		}
-		rfkill->user_claim = claim;
-	}
-
-	mutex_unlock(&rfkill_global_mutex);
-
-	return error ? error : count;
+	return -EOPNOTSUPP;
 }
 
 static struct device_attribute rfkill_dev_attrs[] = {

net/wimax/op-rfkill.c

@@ -364,7 +364,6 @@ int wimax_rfkill_add(struct wimax_dev *wimax_dev)
 	rfkill->state = RFKILL_STATE_UNBLOCKED;
 	rfkill->data = wimax_dev;
 	rfkill->toggle_radio = wimax_rfkill_toggle_radio;
-	rfkill->user_claim_unsupported = 1;
 
 	/* Initialize the input device for the hw key */
 	input_dev = input_allocate_device();