iwlwifi : Patch adds rfkill subsystem for 3945

The patch removes the sysfs interface from iwl3945 and uses
the rfkill subsystem instead.

Original patch by Adel, I fixed the patch to work it properly.
Signed-off-by: Adel Gadllah <adel.gadllah@gmail.com>
Signed-off-by: Abhijeet Kolekar <abhijeet.kolekar@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-3945.h

@@ -36,6 +36,10 @@
 #include <linux/kernel.h>
 #include <net/ieee80211_radiotap.h>
 
+/*used for rfkill*/
+#include <linux/rfkill.h>
+#include <linux/input.h>
+
 /* Hardware specific file defines the PCI IDs table for that hardware module */
 extern struct pci_device_id iwl3945_hw_card_ids[];
 
@@ -686,6 +690,23 @@ enum {
 
 #endif
 
+#ifdef CONFIG_IWLWIFI_RFKILL
+struct iwl3945_priv;
+
+struct iwl3945_rfkill_mngr {
+	struct rfkill *rfkill;
+	struct input_dev *input_dev;
+};
+
+void iwl3945_rfkill_set_hw_state(struct iwl3945_priv *priv);
+void iwl3945_rfkill_unregister(struct iwl3945_priv *priv);
+int iwl3945_rfkill_init(struct iwl3945_priv *priv);
+#else
+static inline void iwl3945_rfkill_set_hw_state(struct iwl3945_priv *priv) {}
+static inline void iwl3945_rfkill_unregister(struct iwl3945_priv *priv) {}
+static inline int iwl3945_rfkill_init(struct iwl3945_priv *priv) { return 0; }
+#endif
+
 #define IWL_MAX_NUM_QUEUES IWL39_MAX_NUM_QUEUES
 
 struct iwl3945_priv {
@@ -779,6 +800,10 @@ struct iwl3945_priv {
 	struct iwl3945_init_alive_resp card_alive_init;
 	struct iwl3945_alive_resp card_alive;
 
+#ifdef CONFIG_IWLWIFI_RFKILL
+	struct iwl3945_rfkill_mngr rfkill_mngr;
+#endif
+
 #ifdef CONFIG_IWL3945_LEDS
 	struct iwl3945_led led[IWL_LED_TRG_MAX];
 	unsigned long last_blink_time;

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

@@ -5921,7 +5921,9 @@ static void __iwl3945_down(struct iwl3945_priv *priv)
 			       test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
 					STATUS_GEO_CONFIGURED |
 			       test_bit(STATUS_IN_SUSPEND, &priv->status) <<
-					STATUS_IN_SUSPEND;
+					STATUS_IN_SUSPEND |
+				test_bit(STATUS_EXIT_PENDING, &priv->status) <<
+					STATUS_EXIT_PENDING;
 		goto exit;
 	}
 
@@ -5936,7 +5938,9 @@ static void __iwl3945_down(struct iwl3945_priv *priv)
 			test_bit(STATUS_IN_SUSPEND, &priv->status) <<
 				STATUS_IN_SUSPEND |
 			test_bit(STATUS_FW_ERROR, &priv->status) <<
-				STATUS_FW_ERROR;
+				STATUS_FW_ERROR |
+			test_bit(STATUS_EXIT_PENDING, &priv->status) <<
+				STATUS_EXIT_PENDING;
 
 	spin_lock_irqsave(&priv->lock, flags);
 	iwl3945_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
@@ -6008,11 +6012,12 @@ static int __iwl3945_up(struct iwl3945_priv *priv)
 	else {
 		set_bit(STATUS_RF_KILL_HW, &priv->status);
 		if (!test_bit(STATUS_IN_SUSPEND, &priv->status)) {
+			iwl3945_rfkill_set_hw_state(priv);
 			IWL_WARNING("Radio disabled by HW RF Kill switch\n");
 			return -ENODEV;
 		}
 	}
-
+	iwl3945_rfkill_set_hw_state(priv);
 	iwl3945_write32(priv, CSR_INT, 0xFFFFFFFF);
 
 	rc = iwl3945_hw_nic_init(priv);
@@ -6068,6 +6073,7 @@ static int __iwl3945_up(struct iwl3945_priv *priv)
 
 	set_bit(STATUS_EXIT_PENDING, &priv->status);
 	__iwl3945_down(priv);
+	clear_bit(STATUS_EXIT_PENDING, &priv->status);
 
 	/* tried to restart and config the device for as long as our
 	 * patience could withstand */
@@ -6135,6 +6141,8 @@ static void iwl3945_bg_rf_kill(struct work_struct *work)
 				    "Kill switch must be turned off for "
 				    "wireless networking to work.\n");
 	}
+
+	iwl3945_rfkill_set_hw_state(priv);
 	mutex_unlock(&priv->mutex);
 }
 
@@ -7412,37 +7420,6 @@ static DRIVER_ATTR(debug_level, S_IWUSR | S_IRUGO,
 
 #endif /* CONFIG_IWL3945_DEBUG */
 
-static ssize_t show_rf_kill(struct device *d,
-			    struct device_attribute *attr, char *buf)
-{
-	/*
-	 * 0 - RF kill not enabled
-	 * 1 - SW based RF kill active (sysfs)
-	 * 2 - HW based RF kill active
-	 * 3 - Both HW and SW based RF kill active
-	 */
-	struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
-	int val = (test_bit(STATUS_RF_KILL_SW, &priv->status) ? 0x1 : 0x0) |
-		  (test_bit(STATUS_RF_KILL_HW, &priv->status) ? 0x2 : 0x0);
-
-	return sprintf(buf, "%i\n", val);
-}
-
-static ssize_t store_rf_kill(struct device *d,
-			     struct device_attribute *attr,
-			     const char *buf, size_t count)
-{
-	struct iwl3945_priv *priv = (struct iwl3945_priv *)d->driver_data;
-
-	mutex_lock(&priv->mutex);
-	iwl3945_radio_kill_sw(priv, buf[0] == '1');
-	mutex_unlock(&priv->mutex);
-
-	return count;
-}
-
-static DEVICE_ATTR(rf_kill, S_IWUSR | S_IRUGO, show_rf_kill, store_rf_kill);
-
 static ssize_t show_temperature(struct device *d,
 				struct device_attribute *attr, char *buf)
 {
@@ -7928,7 +7905,6 @@ static struct attribute *iwl3945_sysfs_entries[] = {
 #endif
 	&dev_attr_power_level.attr,
 	&dev_attr_retry_rate.attr,
-	&dev_attr_rf_kill.attr,
 	&dev_attr_rs_window.attr,
 	&dev_attr_statistics.attr,
 	&dev_attr_status.attr,
@@ -8169,6 +8145,11 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 
+	err = iwl3945_rfkill_init(priv);
+	if (err)
+		IWL_ERROR("Unable to initialize RFKILL system. "
+				  "Ignoring error: %d\n", err);
+
 	return 0;
 
  out_free_geos:
@@ -8231,6 +8212,7 @@ static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
 
 	sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);
 
+	iwl3945_rfkill_unregister(priv);
 	iwl3945_dealloc_ucode_pci(priv);
 
 	if (priv->rxq.bd)
@@ -8299,6 +8281,140 @@ static int iwl3945_pci_resume(struct pci_dev *pdev)
 
 #endif /* CONFIG_PM */
 
+/*************** RFKILL FUNCTIONS **********/
+#ifdef CONFIG_IWLWIFI_RFKILL
+/* software rf-kill from user */
+static int iwl3945_rfkill_soft_rf_kill(void *data, enum rfkill_state state)
+{
+	struct iwl3945_priv *priv = data;
+	int err = 0;
+
+	if (!priv->rfkill_mngr.rfkill)
+	return 0;
+
+	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+		return 0;
+
+	IWL_DEBUG_RF_KILL("we recieved soft RFKILL set to state %d\n", state);
+	mutex_lock(&priv->mutex);
+
+	switch (state) {
+	case RFKILL_STATE_ON:
+		iwl3945_radio_kill_sw(priv, 0);
+		/* if HW rf-kill is set dont allow ON state */
+		if (iwl3945_is_rfkill(priv))
+			err = -EBUSY;
+		break;
+	case RFKILL_STATE_OFF:
+		iwl3945_radio_kill_sw(priv, 1);
+		if (!iwl3945_is_rfkill(priv))
+			err = -EBUSY;
+		break;
+	}
+	mutex_unlock(&priv->mutex);
+
+	return err;
+}
+
+int iwl3945_rfkill_init(struct iwl3945_priv *priv)
+{
+	struct device *device = wiphy_dev(priv->hw->wiphy);
+	int ret = 0;
+
+	BUG_ON(device == NULL);
+
+	IWL_DEBUG_RF_KILL("Initializing RFKILL.\n");
+	priv->rfkill_mngr.rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
+	if (!priv->rfkill_mngr.rfkill) {
+		IWL_ERROR("Unable to allocate rfkill device.\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	priv->rfkill_mngr.rfkill->name = priv->cfg->name;
+	priv->rfkill_mngr.rfkill->data = priv;
+	priv->rfkill_mngr.rfkill->state = RFKILL_STATE_ON;
+	priv->rfkill_mngr.rfkill->toggle_radio = iwl3945_rfkill_soft_rf_kill;
+	priv->rfkill_mngr.rfkill->user_claim_unsupported = 1;
+
+	priv->rfkill_mngr.rfkill->dev.class->suspend = NULL;
+	priv->rfkill_mngr.rfkill->dev.class->resume = NULL;
+
+	priv->rfkill_mngr.input_dev = input_allocate_device();
+	if (!priv->rfkill_mngr.input_dev) {
+		IWL_ERROR("Unable to allocate rfkill input device.\n");
+		ret = -ENOMEM;
+		goto freed_rfkill;
+	}
+
+	priv->rfkill_mngr.input_dev->name = priv->cfg->name;
+	priv->rfkill_mngr.input_dev->phys = wiphy_name(priv->hw->wiphy);
+	priv->rfkill_mngr.input_dev->id.bustype = BUS_HOST;
+	priv->rfkill_mngr.input_dev->id.vendor = priv->pci_dev->vendor;
+	priv->rfkill_mngr.input_dev->dev.parent = device;
+	priv->rfkill_mngr.input_dev->evbit[0] = BIT(EV_KEY);
+	set_bit(KEY_WLAN, priv->rfkill_mngr.input_dev->keybit);
+
+	ret = rfkill_register(priv->rfkill_mngr.rfkill);
+	if (ret) {
+		IWL_ERROR("Unable to register rfkill: %d\n", ret);
+		goto free_input_dev;
+	}
+
+	ret = input_register_device(priv->rfkill_mngr.input_dev);
+	if (ret) {
+		IWL_ERROR("Unable to register rfkill input device: %d\n", ret);
+		goto unregister_rfkill;
+	}
+
+	IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
+	return ret;
+
+unregister_rfkill:
+	rfkill_unregister(priv->rfkill_mngr.rfkill);
+	priv->rfkill_mngr.rfkill = NULL;
+
+free_input_dev:
+	input_free_device(priv->rfkill_mngr.input_dev);
+	priv->rfkill_mngr.input_dev = NULL;
+
+freed_rfkill:
+	if (priv->rfkill_mngr.rfkill != NULL)
+		rfkill_free(priv->rfkill_mngr.rfkill);
+	priv->rfkill_mngr.rfkill = NULL;
+
+error:
+	IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
+	return ret;
+}
+
+void iwl3945_rfkill_unregister(struct iwl3945_priv *priv)
+{
+
+	if (priv->rfkill_mngr.input_dev)
+		input_unregister_device(priv->rfkill_mngr.input_dev);
+
+	if (priv->rfkill_mngr.rfkill)
+		rfkill_unregister(priv->rfkill_mngr.rfkill);
+
+	priv->rfkill_mngr.input_dev = NULL;
+	priv->rfkill_mngr.rfkill = NULL;
+}
+
+/* set rf-kill to the right state. */
+void iwl3945_rfkill_set_hw_state(struct iwl3945_priv *priv)
+{
+
+	if (!priv->rfkill_mngr.rfkill)
+		return;
+
+	if (!iwl3945_is_rfkill(priv))
+		priv->rfkill_mngr.rfkill->state = RFKILL_STATE_ON;
+	else
+		priv->rfkill_mngr.rfkill->state = RFKILL_STATE_OFF;
+}
+#endif
+
 /*****************************************************************************
  *
  * driver and module entry point