iwl3945: report killswitch changes even if the interface is down

Currently iwl3945 is not able to report hw-killswitch events while the
interface is down. This has implications on user space tools (like
NetworkManager) relying on rfkill notifications to bring the interface
up once the wireless gets enabled through a hw killswitch.

Thus, enable the device already in iwl3945_pci_probe instead of iwl3945_up
and poll the CSR_GP_CNTRL register to update the killswitch state every
two seconds. The polling is only needed on 3945 hardware as this adapter
does not use interrupts to signal rfkill changes to the driver (in case no
firmware is loaded). The firmware loading is still done in iwl3945_up.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -1041,6 +1041,7 @@ struct iwl_priv {
 
 	/*For 3945 only*/
 	struct delayed_work thermal_periodic;
+	struct delayed_work rfkill_poll;
 
 	/* TX Power */
 	s8 tx_power_user_lmt;

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -5479,7 +5479,8 @@ static void iwl3945_bg_rf_kill(struct work_struct *work)
 		IWL_DEBUG(IWL_DL_INFO | IWL_DL_RF_KILL,
 			  "HW and/or SW RF Kill no longer active, restarting "
 			  "device\n");
-		if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
+		if (!test_bit(STATUS_EXIT_PENDING, &priv->status) &&
+		     test_bit(STATUS_ALIVE, &priv->status))
 			queue_work(priv->workqueue, &priv->restart);
 	} else {
 
@@ -5496,6 +5497,25 @@ static void iwl3945_bg_rf_kill(struct work_struct *work)
 	iwl3945_rfkill_set_hw_state(priv);
 }
 
+static void iwl3945_rfkill_poll(struct work_struct *data)
+{
+	struct iwl_priv *priv =
+	    container_of(data, struct iwl_priv, rfkill_poll.work);
+	unsigned long status = priv->status;
+
+	if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
+		clear_bit(STATUS_RF_KILL_HW, &priv->status);
+	else
+		set_bit(STATUS_RF_KILL_HW, &priv->status);
+
+	if (test_bit(STATUS_RF_KILL_HW, &status) != test_bit(STATUS_RF_KILL_HW, &priv->status))
+		queue_work(priv->workqueue, &priv->rf_kill);
+
+	queue_delayed_work(priv->workqueue, &priv->rfkill_poll,
+			   round_jiffies_relative(2 * HZ));
+
+}
+
 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
 
 static void iwl3945_bg_scan_check(struct work_struct *data)
@@ -5898,20 +5918,6 @@ static int iwl3945_mac_start(struct ieee80211_hw *hw)
 
 	IWL_DEBUG_MAC80211("enter\n");
 
-	if (pci_enable_device(priv->pci_dev)) {
-		IWL_ERR(priv, "Fail to pci_enable_device\n");
-		return -ENODEV;
-	}
-	pci_restore_state(priv->pci_dev);
-	pci_enable_msi(priv->pci_dev);
-
-	ret = request_irq(priv->pci_dev->irq, iwl3945_isr, IRQF_SHARED,
-			  DRV_NAME, priv);
-	if (ret) {
-		IWL_ERR(priv, "Error allocating IRQ %d\n", priv->pci_dev->irq);
-		goto out_disable_msi;
-	}
-
 	/* we should be verifying the device is ready to be opened */
 	mutex_lock(&priv->mutex);
 
@@ -5957,15 +5963,15 @@ static int iwl3945_mac_start(struct ieee80211_hw *hw)
 		}
 	}
 
+	/* ucode is running and will send rfkill notifications,
+	 * no need to poll the killswitch state anymore */
+	cancel_delayed_work(&priv->rfkill_poll);
+
 	priv->is_open = 1;
 	IWL_DEBUG_MAC80211("leave\n");
 	return 0;
 
 out_release_irq:
-	free_irq(priv->pci_dev->irq, priv);
-out_disable_msi:
-	pci_disable_msi(priv->pci_dev);
-	pci_disable_device(priv->pci_dev);
 	priv->is_open = 0;
 	IWL_DEBUG_MAC80211("leave - failed\n");
 	return ret;
@@ -5996,10 +6002,10 @@ static void iwl3945_mac_stop(struct ieee80211_hw *hw)
 	iwl3945_down(priv);
 
 	flush_workqueue(priv->workqueue);
-	free_irq(priv->pci_dev->irq, priv);
-	pci_disable_msi(priv->pci_dev);
-	pci_save_state(priv->pci_dev);
-	pci_disable_device(priv->pci_dev);
+
+	/* start polling the killswitch state again */
+	queue_delayed_work(priv->workqueue, &priv->rfkill_poll,
+			   round_jiffies_relative(2 * HZ));
 
 	IWL_DEBUG_MAC80211("leave\n");
 }
@@ -7207,6 +7213,7 @@ static void iwl3945_setup_deferred_work(struct iwl_priv *priv)
 	INIT_DELAYED_WORK(&priv->init_alive_start, iwl3945_bg_init_alive_start);
 	INIT_DELAYED_WORK(&priv->alive_start, iwl3945_bg_alive_start);
 	INIT_DELAYED_WORK(&priv->scan_check, iwl3945_bg_scan_check);
+	INIT_DELAYED_WORK(&priv->rfkill_poll, iwl3945_rfkill_poll);
 
 	iwl3945_hw_setup_deferred_work(priv);
 
@@ -7497,6 +7504,15 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	iwl3945_disable_interrupts(priv);
 	spin_unlock_irqrestore(&priv->lock, flags);
 
+	pci_enable_msi(priv->pci_dev);
+
+	err = request_irq(priv->pci_dev->irq, iwl3945_isr, IRQF_SHARED,
+			  DRV_NAME, priv);
+	if (err) {
+		IWL_ERR(priv, "Error allocating IRQ %d\n", priv->pci_dev->irq);
+		goto out_disable_msi;
+	}
+
 	err = sysfs_create_group(&pdev->dev.kobj, &iwl3945_attribute_group);
 	if (err) {
 		IWL_ERR(priv, "failed to create sysfs device attributes\n");
@@ -7507,14 +7523,8 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	iwl3945_setup_deferred_work(priv);
 	iwl3945_setup_rx_handlers(priv);
 
-	/***********************
-	 * 9. Conclude
-	 * ********************/
-	pci_save_state(pdev);
-	pci_disable_device(pdev);
-
 	/*********************************
-	 * 10. Setup and Register mac80211
+	 * 9. Setup and Register mac80211
 	 * *******************************/
 
 	err = ieee80211_register_hw(priv->hw);
@@ -7531,6 +7541,10 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 		IWL_ERR(priv, "Unable to initialize RFKILL system. "
 				  "Ignoring error: %d\n", err);
 
+	/* Start monitoring the killswitch */
+	queue_delayed_work(priv->workqueue, &priv->rfkill_poll,
+			   2 * HZ);
+
 	return 0;
 
  out_remove_sysfs:
@@ -7539,10 +7553,12 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	iwl3945_free_geos(priv);
 
  out_release_irq:
+	free_irq(priv->pci_dev->irq, priv);
 	destroy_workqueue(priv->workqueue);
 	priv->workqueue = NULL;
 	iwl3945_unset_hw_params(priv);
-
+ out_disable_msi:
+	pci_disable_msi(priv->pci_dev);
  out_iounmap:
 	pci_iounmap(pdev, priv->hw_base);
  out_pci_release_regions:
@@ -7587,6 +7603,8 @@ static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
 	sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);
 
 	iwl3945_rfkill_unregister(priv);
+	cancel_delayed_work(&priv->rfkill_poll);
+
 	iwl3945_dealloc_ucode_pci(priv);
 
 	if (priv->rxq.bd)
@@ -7605,6 +7623,9 @@ static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
 	destroy_workqueue(priv->workqueue);
 	priv->workqueue = NULL;
 
+	free_irq(pdev->irq, priv);
+	pci_disable_msi(pdev);
+
 	pci_iounmap(pdev, priv->hw_base);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
@@ -7630,7 +7651,8 @@ static int iwl3945_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 		iwl3945_mac_stop(priv->hw);
 		priv->is_open = 1;
 	}
-
+	pci_save_state(pdev);
+	pci_disable_device(pdev);
 	pci_set_power_state(pdev, PCI_D3hot);
 
 	return 0;
@@ -7641,6 +7663,8 @@ static int iwl3945_pci_resume(struct pci_dev *pdev)
 	struct iwl_priv *priv = pci_get_drvdata(pdev);
 
 	pci_set_power_state(pdev, PCI_D0);
+	pci_enable_device(pdev);
+	pci_restore_state(pdev);
 
 	if (priv->is_open)
 		iwl3945_mac_start(priv->hw);