7 files changed, 394 insertions, 355 deletions

diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index ea8321a483f9..9d2369269abf 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -40,6 +40,7 @@ config NFC_MEI_PHY
 
 config NFC_SIM
 	tristate "NFC hardware simulator driver"
+	depends on NFC_DIGITAL
 	help
 	  This driver declares two virtual NFC devices supporting NFC-DEP
 	  protocol. An LLCP connection can be established between them and
diff --git a/drivers/nfc/fdp/fdp.c b/drivers/nfc/fdp/fdp.c
index e44a7a2f4061..7c1eaea3b685 100644
--- a/drivers/nfc/fdp/fdp.c
+++ b/drivers/nfc/fdp/fdp.c
@@ -345,7 +345,7 @@ static void fdp_nci_release_firmware(struct nci_dev *ndev)
 
 	if (info->ram_patch) {
 		release_firmware(info->ram_patch);
-		info->otp_patch = NULL;
+		info->ram_patch = NULL;
 	}
 }
 
@@ -353,7 +353,7 @@ static int fdp_nci_patch_otp(struct nci_dev *ndev)
 {
 	struct fdp_nci_info *info = nci_get_drvdata(ndev);
 	struct device *dev = &info->phy->i2c_dev->dev;
-	u8 conn_id;
+	int conn_id;
 	int r = 0;
 
 	if (info->otp_version >= info->otp_patch_version)
@@ -424,7 +424,7 @@ static int fdp_nci_patch_ram(struct nci_dev *ndev)
 {
 	struct fdp_nci_info *info = nci_get_drvdata(ndev);
 	struct device *dev = &info->phy->i2c_dev->dev;
-	u8 conn_id;
+	int conn_id;
 	int r = 0;
 
 	if (info->ram_version >= info->ram_patch_version)
diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c
index 93aaca586858..a466e7978466 100644
--- a/drivers/nfc/nfcsim.c
+++ b/drivers/nfc/nfcsim.c
@@ -16,525 +16,492 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
 #include <linux/nfc.h>
 #include <net/nfc/nfc.h>
+#include <net/nfc/digital.h>
 
-#define DEV_ERR(_dev, fmt, args...) nfc_err(&_dev->nfc_dev->dev, \
-						"%s: " fmt, __func__, ## args)
+#define NFCSIM_ERR(d, fmt, args...) nfc_err(&d->nfc_digital_dev->nfc_dev->dev, \
+					    "%s: " fmt, __func__, ## args)
 
-#define DEV_DBG(_dev, fmt, args...) dev_dbg(&_dev->nfc_dev->dev, \
-						"%s: " fmt, __func__, ## args)
+#define NFCSIM_DBG(d, fmt, args...) dev_dbg(&d->nfc_digital_dev->nfc_dev->dev, \
+					    "%s: " fmt, __func__, ## args)
 
-#define NFCSIM_VERSION "0.1"
+#define NFCSIM_VERSION "0.2"
 
-#define NFCSIM_POLL_NONE	0
-#define NFCSIM_POLL_INITIATOR	1
-#define NFCSIM_POLL_TARGET	2
-#define NFCSIM_POLL_DUAL	(NFCSIM_POLL_INITIATOR | NFCSIM_POLL_TARGET)
+#define NFCSIM_MODE_NONE	0
+#define NFCSIM_MODE_INITIATOR	1
+#define NFCSIM_MODE_TARGET	2
 
-#define RX_DEFAULT_DELAY	5
+#define NFCSIM_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC   | \
+			     NFC_DIGITAL_DRV_CAPS_TG_CRC)
 
 struct nfcsim {
-	struct nfc_dev *nfc_dev;
+	struct nfc_digital_dev *nfc_digital_dev;
 
-	struct mutex lock;
+	struct work_struct recv_work;
+	struct delayed_work send_work;
 
-	struct delayed_work recv_work;
+	struct nfcsim_link *link_in;
+	struct nfcsim_link *link_out;
 
-	struct sk_buff *clone_skb;
+	bool up;
+	u8 mode;
+	u8 rf_tech;
 
-	struct delayed_work poll_work;
-	u8 polling_mode;
-	u8 curr_polling_mode;
+	u16 recv_timeout;
 
-	u8 shutting_down;
+	nfc_digital_cmd_complete_t cb;
+	void *arg;
 
-	u8 up;
+	u8 dropframe;
+};
 
-	u8 initiator;
+struct nfcsim_link {
+	struct mutex lock;
 
-	u32 rx_delay;
+	u8 rf_tech;
+	u8 mode;
 
-	data_exchange_cb_t cb;
-	void *cb_context;
+	u8 shutdown;
 
-	struct nfcsim *peer_dev;
+	struct sk_buff *skb;
+	wait_queue_head_t recv_wait;
+	u8 cond;
 };
 
-static struct nfcsim *dev0;
-static struct nfcsim *dev1;
-
-static struct workqueue_struct *wq;
-
-static void nfcsim_cleanup_dev(struct nfcsim *dev, u8 shutdown)
+static struct nfcsim_link *nfcsim_link_new(void)
 {
-	DEV_DBG(dev, "shutdown=%d\n", shutdown);
+	struct nfcsim_link *link;
 
-	mutex_lock(&dev->lock);
+	link = kzalloc(sizeof(struct nfcsim_link), GFP_KERNEL);
+	if (!link)
+		return NULL;
 
-	dev->polling_mode = NFCSIM_POLL_NONE;
-	dev->shutting_down = shutdown;
-	dev->cb = NULL;
-	dev_kfree_skb(dev->clone_skb);
-	dev->clone_skb = NULL;
+	mutex_init(&link->lock);
+	init_waitqueue_head(&link->recv_wait);
 
-	mutex_unlock(&dev->lock);
-
-	cancel_delayed_work_sync(&dev->poll_work);
-	cancel_delayed_work_sync(&dev->recv_work);
+	return link;
 }
 
-static int nfcsim_target_found(struct nfcsim *dev)
+static void nfcsim_link_free(struct nfcsim_link *link)
 {
-	struct nfc_target nfc_tgt;
+	dev_kfree_skb(link->skb);
+	kfree(link);
+}
 
-	DEV_DBG(dev, "\n");
+static void nfcsim_link_recv_wake(struct nfcsim_link *link)
+{
+	link->cond = 1;
+	wake_up_interruptible(&link->recv_wait);
+}
 
-	memset(&nfc_tgt, 0, sizeof(struct nfc_target));
+static void nfcsim_link_set_skb(struct nfcsim_link *link, struct sk_buff *skb,
+				u8 rf_tech, u8 mode)
+{
+	mutex_lock(&link->lock);
 
-	nfc_tgt.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
-	nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
+	dev_kfree_skb(link->skb);
+	link->skb = skb;
+	link->rf_tech = rf_tech;
+	link->mode = mode;
 
-	return 0;
+	mutex_unlock(&link->lock);
 }
 
-static int nfcsim_dev_up(struct nfc_dev *nfc_dev)
+static void nfcsim_link_recv_cancel(struct nfcsim_link *link)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
+	mutex_lock(&link->lock);
 
-	DEV_DBG(dev, "\n");
+	link->mode = NFCSIM_MODE_NONE;
 
-	mutex_lock(&dev->lock);
+	mutex_unlock(&link->lock);
 
-	dev->up = 1;
-
-	mutex_unlock(&dev->lock);
-
-	return 0;
+	nfcsim_link_recv_wake(link);
 }
 
-static int nfcsim_dev_down(struct nfc_dev *nfc_dev)
+static void nfcsim_link_shutdown(struct nfcsim_link *link)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
-
-	DEV_DBG(dev, "\n");
+	mutex_lock(&link->lock);
 
-	mutex_lock(&dev->lock);
+	link->shutdown = 1;
+	link->mode = NFCSIM_MODE_NONE;
 
-	dev->up = 0;
+	mutex_unlock(&link->lock);
 
-	mutex_unlock(&dev->lock);
-
-	return 0;
+	nfcsim_link_recv_wake(link);
 }
 
-static int nfcsim_dep_link_up(struct nfc_dev *nfc_dev,
-			      struct nfc_target *target,
-			      u8 comm_mode, u8 *gb, size_t gb_len)
+static struct sk_buff *nfcsim_link_recv_skb(struct nfcsim_link *link,
+					    int timeout, u8 rf_tech, u8 mode)
 {
 	int rc;
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
-	struct nfcsim *peer = dev->peer_dev;
-	u8 *remote_gb;
-	size_t remote_gb_len;
+	struct sk_buff *skb;
 
-	DEV_DBG(dev, "target_idx: %d, comm_mode: %d\n", target->idx, comm_mode);
+	rc = wait_event_interruptible_timeout(link->recv_wait,
+					      link->cond,
+					      msecs_to_jiffies(timeout));
 
-	mutex_lock(&peer->lock);
+	mutex_lock(&link->lock);
 
-	nfc_tm_activated(peer->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
-			 NFC_COMM_ACTIVE, gb, gb_len);
+	skb = link->skb;
+	link->skb = NULL;
 
-	remote_gb = nfc_get_local_general_bytes(peer->nfc_dev, &remote_gb_len);
-	if (!remote_gb) {
-		DEV_ERR(peer, "Can't get remote general bytes\n");
+	if (!rc) {
+		rc = -ETIMEDOUT;
+		goto done;
+	}
 
-		mutex_unlock(&peer->lock);
-		return -EINVAL;
+	if (!skb || link->rf_tech != rf_tech || link->mode == mode) {
+		rc = -EINVAL;
+		goto done;
 	}
 
-	mutex_unlock(&peer->lock);
+	if (link->shutdown) {
+		rc = -ENODEV;
+		goto done;
+	}
 
-	mutex_lock(&dev->lock);
+done:
+	mutex_unlock(&link->lock);
 
-	rc = nfc_set_remote_general_bytes(nfc_dev, remote_gb, remote_gb_len);
-	if (rc) {
-		DEV_ERR(dev, "Can't set remote general bytes\n");
-		mutex_unlock(&dev->lock);
-		return rc;
+	if (rc < 0) {
+		dev_kfree_skb(skb);
+		skb = ERR_PTR(rc);
 	}
 
-	rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_ACTIVE,
-				NFC_RF_INITIATOR);
-
-	mutex_unlock(&dev->lock);
+	link->cond = 0;
 
-	return rc;
+	return skb;
 }
 
-static int nfcsim_dep_link_down(struct nfc_dev *nfc_dev)
+static void nfcsim_send_wq(struct work_struct *work)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
+	struct nfcsim *dev = container_of(work, struct nfcsim, send_work.work);
 
-	DEV_DBG(dev, "\n");
-
-	nfcsim_cleanup_dev(dev, 0);
-
-	return 0;
+	/*
+	 * To effectively send data, the device just wake up its link_out which
+	 * is the link_in of the peer device. The exchanged skb has already been
+	 * stored in the dev->link_out through nfcsim_link_set_skb().
+	 */
+	nfcsim_link_recv_wake(dev->link_out);
 }
 
-static int nfcsim_start_poll(struct nfc_dev *nfc_dev,
-			     u32 im_protocols, u32 tm_protocols)
+static void nfcsim_recv_wq(struct work_struct *work)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
-	int rc;
-
-	mutex_lock(&dev->lock);
+	struct nfcsim *dev = container_of(work, struct nfcsim, recv_work);
+	struct sk_buff *skb;
 
-	if (dev->polling_mode != NFCSIM_POLL_NONE) {
-		DEV_ERR(dev, "Already in polling mode\n");
-		rc = -EBUSY;
-		goto exit;
-	}
+	skb = nfcsim_link_recv_skb(dev->link_in, dev->recv_timeout,
+				   dev->rf_tech, dev->mode);
 
-	if (im_protocols & NFC_PROTO_NFC_DEP_MASK)
-		dev->polling_mode |= NFCSIM_POLL_INITIATOR;
+	if (!dev->up) {
+		NFCSIM_ERR(dev, "Device is down\n");
 
-	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK)
-		dev->polling_mode |= NFCSIM_POLL_TARGET;
+		if (!IS_ERR(skb))
+			dev_kfree_skb(skb);
 
-	if (dev->polling_mode == NFCSIM_POLL_NONE) {
-		DEV_ERR(dev, "Unsupported polling mode\n");
-		rc = -EINVAL;
-		goto exit;
+		skb = ERR_PTR(-ENODEV);
 	}
 
-	dev->initiator = 0;
-	dev->curr_polling_mode = NFCSIM_POLL_NONE;
+	dev->cb(dev->nfc_digital_dev, dev->arg, skb);
+}
 
-	queue_delayed_work(wq, &dev->poll_work, 0);
+static int nfcsim_send(struct nfc_digital_dev *ddev, struct sk_buff *skb,
+		       u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
+{
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+	u8 delay;
 
-	DEV_DBG(dev, "Start polling: im: 0x%X, tm: 0x%X\n", im_protocols,
-		tm_protocols);
+	if (!dev->up) {
+		NFCSIM_ERR(dev, "Device is down\n");
+		return -ENODEV;
+	}
 
-	rc = 0;
-exit:
-	mutex_unlock(&dev->lock);
+	dev->recv_timeout = timeout;
+	dev->cb = cb;
+	dev->arg = arg;
 
-	return rc;
-}
+	schedule_work(&dev->recv_work);
 
-static void nfcsim_stop_poll(struct nfc_dev *nfc_dev)
-{
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
+	if (dev->dropframe) {
+		NFCSIM_DBG(dev, "dropping frame (out of %d)\n", dev->dropframe);
+		dev_kfree_skb(skb);
+		dev->dropframe--;
 
-	DEV_DBG(dev, "Stop poll\n");
+		return 0;
+	}
 
-	mutex_lock(&dev->lock);
+	if (skb) {
+		nfcsim_link_set_skb(dev->link_out, skb, dev->rf_tech,
+				    dev->mode);
 
-	dev->polling_mode = NFCSIM_POLL_NONE;
+		/* Add random delay (between 3 and 10 ms) before sending data */
+		get_random_bytes(&delay, 1);
+		delay = 3 + (delay & 0x07);
 
-	mutex_unlock(&dev->lock);
+		schedule_delayed_work(&dev->send_work, msecs_to_jiffies(delay));
+	}
 
-	cancel_delayed_work_sync(&dev->poll_work);
+	return 0;
 }
 
-static int nfcsim_activate_target(struct nfc_dev *nfc_dev,
-				  struct nfc_target *target, u32 protocol)
+static void nfcsim_abort_cmd(struct nfc_digital_dev *ddev)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
-
-	DEV_DBG(dev, "\n");
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
 
-	return -ENOTSUPP;
+	nfcsim_link_recv_cancel(dev->link_in);
 }
 
-static void nfcsim_deactivate_target(struct nfc_dev *nfc_dev,
-				     struct nfc_target *target, u8 mode)
+static int nfcsim_switch_rf(struct nfc_digital_dev *ddev, bool on)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
+
+	dev->up = on;
 
-	DEV_DBG(dev, "\n");
+	return 0;
 }
 
-static void nfcsim_wq_recv(struct work_struct *work)
+static int nfcsim_in_configure_hw(struct nfc_digital_dev *ddev,
+					  int type, int param)
 {
-	struct nfcsim *dev = container_of(work, struct nfcsim,
-					  recv_work.work);
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
 
-	mutex_lock(&dev->lock);
+	switch (type) {
+	case NFC_DIGITAL_CONFIG_RF_TECH:
+		dev->up = true;
+		dev->mode = NFCSIM_MODE_INITIATOR;
+		dev->rf_tech = param;
+		break;
 
-	if (dev->shutting_down || !dev->up || !dev->clone_skb) {
-		dev_kfree_skb(dev->clone_skb);
-		goto exit;
-	}
+	case NFC_DIGITAL_CONFIG_FRAMING:
+		break;
 
-	if (dev->initiator) {
-		if (!dev->cb) {
-			DEV_ERR(dev, "Null recv callback\n");
-			dev_kfree_skb(dev->clone_skb);
-			goto exit;
-		}
-
-		dev->cb(dev->cb_context, dev->clone_skb, 0);
-		dev->cb = NULL;
-	} else {
-		nfc_tm_data_received(dev->nfc_dev, dev->clone_skb);
+	default:
+		NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
+		return -EINVAL;
 	}
 
-exit:
-	dev->clone_skb = NULL;
+	return 0;
+}
 
-	mutex_unlock(&dev->lock);
+static int nfcsim_in_send_cmd(struct nfc_digital_dev *ddev,
+			       struct sk_buff *skb, u16 timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return nfcsim_send(ddev, skb, timeout, cb, arg);
 }
 
-static int nfcsim_tx(struct nfc_dev *nfc_dev, struct nfc_target *target,
-		     struct sk_buff *skb, data_exchange_cb_t cb,
-		     void *cb_context)
+static int nfcsim_tg_configure_hw(struct nfc_digital_dev *ddev,
+					  int type, int param)
 {
-	struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
-	struct nfcsim *peer = dev->peer_dev;
-	int err;
+	struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
 
-	mutex_lock(&dev->lock);
+	switch (type) {
+	case NFC_DIGITAL_CONFIG_RF_TECH:
+		dev->up = true;
+		dev->mode = NFCSIM_MODE_TARGET;
+		dev->rf_tech = param;
+		break;
 
-	if (dev->shutting_down || !dev->up) {
-		mutex_unlock(&dev->lock);
-		err = -ENODEV;
-		goto exit;
+	case NFC_DIGITAL_CONFIG_FRAMING:
+		break;
+
+	default:
+		NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
+		return -EINVAL;
 	}
 
-	dev->cb = cb;
-	dev->cb_context = cb_context;
+	return 0;
+}
 
-	mutex_unlock(&dev->lock);
+static int nfcsim_tg_send_cmd(struct nfc_digital_dev *ddev,
+			       struct sk_buff *skb, u16 timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return nfcsim_send(ddev, skb, timeout, cb, arg);
+}
 
-	mutex_lock(&peer->lock);
+static int nfcsim_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
+			    nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return nfcsim_send(ddev, NULL, timeout, cb, arg);
+}
 
-	peer->clone_skb = skb_clone(skb, GFP_KERNEL);
+static struct nfc_digital_ops nfcsim_digital_ops = {
+	.in_configure_hw = nfcsim_in_configure_hw,
+	.in_send_cmd = nfcsim_in_send_cmd,
 
-	if (!peer->clone_skb) {
-		DEV_ERR(dev, "skb_clone failed\n");
-		mutex_unlock(&peer->lock);
-		err = -ENOMEM;
-		goto exit;
-	}
+	.tg_listen = nfcsim_tg_listen,
+	.tg_configure_hw = nfcsim_tg_configure_hw,
+	.tg_send_cmd = nfcsim_tg_send_cmd,
 
-	/* This simulates an arbitrary transmission delay between the 2 devices.
-	 * If packet transmission occurs immediately between them, we have a
-	 * non-stop flow of several tens of thousands SYMM packets per second
-	 * and a burning cpu.
-	 */
-	queue_delayed_work(wq, &peer->recv_work,
-			msecs_to_jiffies(dev->rx_delay));
+	.abort_cmd = nfcsim_abort_cmd,
+	.switch_rf = nfcsim_switch_rf,
+};
+
+static struct dentry *nfcsim_debugfs_root;
 
-	mutex_unlock(&peer->lock);
+static void nfcsim_debugfs_init(void)
+{
+	nfcsim_debugfs_root = debugfs_create_dir("nfcsim", NULL);
 
-	err = 0;
-exit:
-	dev_kfree_skb(skb);
+	if (!nfcsim_debugfs_root)
+		pr_err("Could not create debugfs entry\n");
 
-	return err;
 }
 
-static int nfcsim_im_transceive(struct nfc_dev *nfc_dev,
-				struct nfc_target *target, struct sk_buff *skb,
-				data_exchange_cb_t cb, void *cb_context)
+static void nfcsim_debugfs_remove(void)
 {
-	return nfcsim_tx(nfc_dev, target, skb, cb, cb_context);
+	debugfs_remove_recursive(nfcsim_debugfs_root);
 }
 
-static int nfcsim_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
+static void nfcsim_debugfs_init_dev(struct nfcsim *dev)
 {
-	return nfcsim_tx(nfc_dev, NULL, skb, NULL, NULL);
-}
-
-static struct nfc_ops nfcsim_nfc_ops = {
-	.dev_up = nfcsim_dev_up,
-	.dev_down = nfcsim_dev_down,
-	.dep_link_up = nfcsim_dep_link_up,
-	.dep_link_down = nfcsim_dep_link_down,
-	.start_poll = nfcsim_start_poll,
-	.stop_poll = nfcsim_stop_poll,
-	.activate_target = nfcsim_activate_target,
-	.deactivate_target = nfcsim_deactivate_target,
-	.im_transceive = nfcsim_im_transceive,
-	.tm_send = nfcsim_tm_send,
-};
+	struct dentry *dev_dir;
+	char devname[5]; /* nfcX\0 */
+	u32 idx;
+	int n;
 
-static void nfcsim_set_polling_mode(struct nfcsim *dev)
-{
-	if (dev->polling_mode == NFCSIM_POLL_NONE) {
-		dev->curr_polling_mode = NFCSIM_POLL_NONE;
+	if (!nfcsim_debugfs_root) {
+		NFCSIM_ERR(dev, "nfcsim debugfs not initialized\n");
 		return;
 	}
 
-	if (dev->curr_polling_mode == NFCSIM_POLL_NONE) {
-		if (dev->polling_mode & NFCSIM_POLL_INITIATOR)
-			dev->curr_polling_mode = NFCSIM_POLL_INITIATOR;
-		else
-			dev->curr_polling_mode = NFCSIM_POLL_TARGET;
-
+	idx = dev->nfc_digital_dev->nfc_dev->idx;
+	n = snprintf(devname, sizeof(devname), "nfc%d", idx);
+	if (n >= sizeof(devname)) {
+		NFCSIM_ERR(dev, "Could not compute dev name for dev %d\n", idx);
 		return;
 	}
 
-	if (dev->polling_mode == NFCSIM_POLL_DUAL) {
-		if (dev->curr_polling_mode == NFCSIM_POLL_TARGET)
-			dev->curr_polling_mode = NFCSIM_POLL_INITIATOR;
-		else
-			dev->curr_polling_mode = NFCSIM_POLL_TARGET;
+	dev_dir = debugfs_create_dir(devname, nfcsim_debugfs_root);
+	if (!dev_dir) {
+		NFCSIM_ERR(dev, "Could not create debugfs entries for nfc%d\n",
+			   idx);
+		return;
 	}
+
+	debugfs_create_u8("dropframe", 0664, dev_dir, &dev->dropframe);
 }
 
-static void nfcsim_wq_poll(struct work_struct *work)
+static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in,
+					struct nfcsim_link *link_out)
 {
-	struct nfcsim *dev = container_of(work, struct nfcsim, poll_work.work);
-	struct nfcsim *peer = dev->peer_dev;
+	struct nfcsim *dev;
+	int rc;
 
-	/* These work items run on an ordered workqueue and are therefore
-	 * serialized. So we can take both mutexes without being dead locked.
-	 */
-	mutex_lock(&dev->lock);
-	mutex_lock(&peer->lock);
+	dev = kzalloc(sizeof(struct nfcsim), GFP_KERNEL);
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
 
-	nfcsim_set_polling_mode(dev);
+	INIT_DELAYED_WORK(&dev->send_work, nfcsim_send_wq);
+	INIT_WORK(&dev->recv_work, nfcsim_recv_wq);
 
-	if (dev->curr_polling_mode == NFCSIM_POLL_NONE) {
-		DEV_DBG(dev, "Not polling\n");
-		goto unlock;
+	dev->nfc_digital_dev =
+			nfc_digital_allocate_device(&nfcsim_digital_ops,
+						    NFC_PROTO_NFC_DEP_MASK,
+						    NFCSIM_CAPABILITIES,
+						    0, 0);
+	if (!dev->nfc_digital_dev) {
+		kfree(dev);
+		return ERR_PTR(-ENOMEM);
 	}
 
-	DEV_DBG(dev, "Polling as %s",
-		dev->curr_polling_mode == NFCSIM_POLL_INITIATOR ?
-		"initiator\n" : "target\n");
+	nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
 
-	if (dev->curr_polling_mode == NFCSIM_POLL_TARGET)
-		goto sched_work;
+	dev->link_in = link_in;
+	dev->link_out = link_out;
 
-	if (peer->curr_polling_mode == NFCSIM_POLL_TARGET) {
-		peer->polling_mode = NFCSIM_POLL_NONE;
-		dev->polling_mode = NFCSIM_POLL_NONE;
-
-		dev->initiator = 1;
-
-		nfcsim_target_found(dev);
+	rc = nfc_digital_register_device(dev->nfc_digital_dev);
+	if (rc) {
+		pr_err("Could not register digital device (%d)\n", rc);
+		nfc_digital_free_device(dev->nfc_digital_dev);
+		kfree(dev);
 
-		goto unlock;
+		return ERR_PTR(rc);
 	}
 
-sched_work:
-	/* This defines the delay for an initiator to check if the other device
-	 * is polling in target mode.
-	 * If the device starts in dual mode polling, it switches between
-	 * initiator and target at every round.
-	 * Because the wq is ordered and only 1 work item is executed at a time,
-	 * we'll always have one device polling as initiator and the other as
-	 * target at some point, even if both are started in dual mode.
-	 */
-	queue_delayed_work(wq, &dev->poll_work, msecs_to_jiffies(200));
+	nfcsim_debugfs_init_dev(dev);
 
-unlock:
-	mutex_unlock(&peer->lock);
-	mutex_unlock(&dev->lock);
+	return dev;
 }
 
-static struct nfcsim *nfcsim_init_dev(void)
+static void nfcsim_device_free(struct nfcsim *dev)
 {
-	struct nfcsim *dev;
-	int rc = -ENOMEM;
+	nfc_digital_unregister_device(dev->nfc_digital_dev);
 
-	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-	if (dev == NULL)
-		return ERR_PTR(-ENOMEM);
+	dev->up = false;
 
-	mutex_init(&dev->lock);
+	nfcsim_link_shutdown(dev->link_in);
 
-	INIT_DELAYED_WORK(&dev->recv_work, nfcsim_wq_recv);
-	INIT_DELAYED_WORK(&dev->poll_work, nfcsim_wq_poll);
+	cancel_delayed_work_sync(&dev->send_work);
+	cancel_work_sync(&dev->recv_work);
 
-	dev->nfc_dev = nfc_allocate_device(&nfcsim_nfc_ops,
-					   NFC_PROTO_NFC_DEP_MASK,
-					   0, 0);
-	if (!dev->nfc_dev)
-		goto error;
+	nfc_digital_free_device(dev->nfc_digital_dev);
 
-	nfc_set_drvdata(dev->nfc_dev, dev);
-
-	rc = nfc_register_device(dev->nfc_dev);
-	if (rc)
-		goto free_nfc_dev;
-
-	dev->rx_delay = RX_DEFAULT_DELAY;
-	return dev;
-
-free_nfc_dev:
-	nfc_free_device(dev->nfc_dev);
-
-error:
 	kfree(dev);
-
-	return ERR_PTR(rc);
 }
 
-static void nfcsim_free_device(struct nfcsim *dev)
-{
-	nfc_unregister_device(dev->nfc_dev);
-
-	nfc_free_device(dev->nfc_dev);
-
-	kfree(dev);
-}
+static struct nfcsim *dev0;
+static struct nfcsim *dev1;
 
 static int __init nfcsim_init(void)
 {
+	struct nfcsim_link *link0, *link1;
 	int rc;
 
-	/* We need an ordered wq to ensure that poll_work items are executed
-	 * one at a time.
-	 */
-	wq = alloc_ordered_workqueue("nfcsim", 0);
-	if (!wq) {
+	link0 = nfcsim_link_new();
+	link1 = nfcsim_link_new();
+	if (!link0 || !link1) {
 		rc = -ENOMEM;
-		goto exit;
+		goto exit_err;
 	}
 
-	dev0 = nfcsim_init_dev();
+	nfcsim_debugfs_init();
+
+	dev0 = nfcsim_device_new(link0, link1);
 	if (IS_ERR(dev0)) {
 		rc = PTR_ERR(dev0);
-		goto exit;
+		goto exit_err;
 	}
 
-	dev1 = nfcsim_init_dev();
+	dev1 = nfcsim_device_new(link1, link0);
 	if (IS_ERR(dev1)) {
-		kfree(dev0);
+		nfcsim_device_free(dev0);
 
 		rc = PTR_ERR(dev1);
-		goto exit;
+		goto exit_err;
 	}
 
-	dev0->peer_dev = dev1;
-	dev1->peer_dev = dev0;
+	pr_info("nfcsim " NFCSIM_VERSION " initialized\n");
+
+	return 0;
 
-	pr_debug("NFCsim " NFCSIM_VERSION " initialized\n");
+exit_err:
+	pr_err("Failed to initialize nfcsim driver (%d)\n", rc);
 
-	rc = 0;
-exit:
-	if (rc)
-		pr_err("Failed to initialize nfcsim driver (%d)\n",
-		       rc);
+	nfcsim_link_free(link0);
+	nfcsim_link_free(link1);
 
 	return rc;
 }
 
 static void __exit nfcsim_exit(void)
 {
-	nfcsim_cleanup_dev(dev0, 1);
-	nfcsim_cleanup_dev(dev1, 1);
+	struct nfcsim_link *link0, *link1;
+
+	link0 = dev0->link_in;
+	link1 = dev0->link_out;
+
+	nfcsim_device_free(dev0);
+	nfcsim_device_free(dev1);
 
-	nfcsim_free_device(dev0);
-	nfcsim_free_device(dev1);
+	nfcsim_link_free(link0);
+	nfcsim_link_free(link1);
 
-	destroy_workqueue(wq);
+	nfcsim_debugfs_remove();
 }
 
 module_init(nfcsim_init);
diff --git a/drivers/nfc/nfcwilink.c b/drivers/nfc/nfcwilink.c
index f81e500e7650..3fbd18b8e473 100644
--- a/drivers/nfc/nfcwilink.c
+++ b/drivers/nfc/nfcwilink.c
@@ -94,7 +94,7 @@ struct nfcwilink {
 	struct nci_dev			*ndev;
 	unsigned long			flags;
 
-	char				st_register_cb_status;
+	int				st_register_cb_status;
 	long				(*st_write) (struct sk_buff *);
 
 	struct completion		completed;
@@ -320,7 +320,7 @@ exit:
 }
 
 /* Called by ST when registration is complete */
-static void nfcwilink_register_complete(void *priv_data, char data)
+static void nfcwilink_register_complete(void *priv_data, int data)
 {
 	struct nfcwilink *drv = priv_data;
 
diff --git a/drivers/nfc/pn533/usb.c b/drivers/nfc/pn533/usb.c
index 8ca060324b6a..33ed78be2750 100644
--- a/drivers/nfc/pn533/usb.c
+++ b/drivers/nfc/pn533/usb.c
@@ -464,10 +464,8 @@ static int pn533_usb_probe(struct usb_interface *interface,
 		return -ENOMEM;
 
 	in_buf = kzalloc(in_buf_len, GFP_KERNEL);
-	if (!in_buf) {
-		rc = -ENOMEM;
-		goto out_free_phy;
-	}
+	if (!in_buf)
+		return -ENOMEM;
 
 	phy->udev = usb_get_dev(interface_to_usbdev(interface));
 	phy->interface = interface;
@@ -554,8 +552,7 @@ error:
 	usb_free_urb(phy->out_urb);
 	usb_put_dev(phy->udev);
 	kfree(in_buf);
-out_free_phy:
-	kfree(phy);
+
 	return rc;
 }
 
diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c
index 87d509996704..2b2330b235e6 100644
--- a/drivers/nfc/port100.c
+++ b/drivers/nfc/port100.c
@@ -343,7 +343,26 @@ in_protocols[][PORT100_IN_MAX_NUM_PROTOCOLS + 1] = {
 	},
 	[NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
 		/* nfc_digital_framing_nfcf */
-		{ PORT100_IN_PROT_END, 0 },
+		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,     18 },
+		{ PORT100_IN_PROT_ADD_CRC,                 1 },
+		{ PORT100_IN_PROT_CHECK_CRC,               1 },
+		{ PORT100_IN_PROT_MULTI_CARD,              0 },
+		{ PORT100_IN_PROT_ADD_PARITY,              0 },
+		{ PORT100_IN_PROT_CHECK_PARITY,            0 },
+		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
+		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
+		{ PORT100_IN_PROT_CRYPTO1,                 0 },
+		{ PORT100_IN_PROT_ADD_SOF,                 0 },
+		{ PORT100_IN_PROT_CHECK_SOF,               0 },
+		{ PORT100_IN_PROT_ADD_EOF,                 0 },
+		{ PORT100_IN_PROT_CHECK_EOF,               0 },
+		{ PORT100_IN_PROT_DEAF_TIME,               4 },
+		{ PORT100_IN_PROT_CRM,                     0 },
+		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
+		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
+		{ PORT100_IN_PROT_RFCA,                    0 },
+		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
+		{ PORT100_IN_PROT_END,                     0 },
 	},
 	[NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
 		{ PORT100_IN_PROT_END, 0 },
@@ -437,6 +456,12 @@ struct port100 {
 	struct urb *out_urb;
 	struct urb *in_urb;
 
+	/* This mutex protects the out_urb and avoids to submit a new command
+	 * through port100_send_frame_async() while the previous one is being
+	 * canceled through port100_abort_cmd().
+	 */
+	struct mutex out_urb_lock;
+
 	struct work_struct cmd_complete_work;
 
 	u8 cmd_type;
@@ -445,6 +470,9 @@ struct port100 {
 	 * for any queuing/locking mechanism at driver level.
 	 */
 	struct port100_cmd *cmd;
+
+	bool cmd_cancel;
+	struct completion cmd_cancel_done;
 };
 
 struct port100_cmd {
@@ -699,10 +727,27 @@ static int port100_send_ack(struct port100 *dev)
 {
 	int rc;
 
+	mutex_lock(&dev->out_urb_lock);
+
+	init_completion(&dev->cmd_cancel_done);
+
+	usb_kill_urb(dev->out_urb);
+
 	dev->out_urb->transfer_buffer = ack_frame;
 	dev->out_urb->transfer_buffer_length = sizeof(ack_frame);
 	rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 
+	/* Set the cmd_cancel flag only if the URB has been successfully
+	 * submitted. It will be reset by the out URB completion callback
+	 * port100_send_complete().
+	 */
+	dev->cmd_cancel = !rc;
+
+	mutex_unlock(&dev->out_urb_lock);
+
+	if (!rc)
+		wait_for_completion(&dev->cmd_cancel_done);
+
 	return rc;
 }
 
@@ -711,6 +756,16 @@ static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
 {
 	int rc;
 
+	mutex_lock(&dev->out_urb_lock);
+
+	/* A command cancel frame as been sent through dev->out_urb. Don't try
+	 * to submit a new one.
+	 */
+	if (dev->cmd_cancel) {
+		rc = -EAGAIN;
+		goto exit;
+	}
+
 	dev->out_urb->transfer_buffer = out->data;
 	dev->out_urb->transfer_buffer_length = out->len;
 
@@ -722,16 +777,15 @@ static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
 
 	rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 	if (rc)
-		return rc;
+		goto exit;
 
 	rc = port100_submit_urb_for_ack(dev, GFP_KERNEL);
 	if (rc)
-		goto error;
+		usb_unlink_urb(dev->out_urb);
 
-	return 0;
+exit:
+	mutex_unlock(&dev->out_urb_lock);
 
-error:
-	usb_unlink_urb(dev->out_urb);
 	return rc;
 }
 
@@ -790,6 +844,12 @@ static int port100_send_cmd_async(struct port100 *dev, u8 cmd_code,
 			PORT100_FRAME_MAX_PAYLOAD_LEN +
 			PORT100_FRAME_TAIL_LEN;
 
+	if (dev->cmd) {
+		nfc_err(&dev->interface->dev,
+			"A command is still in process\n");
+		return -EBUSY;
+	}
+
 	resp = alloc_skb(resp_len, GFP_KERNEL);
 	if (!resp)
 		return -ENOMEM;
@@ -867,6 +927,11 @@ static void port100_send_complete(struct urb *urb)
 {
 	struct port100 *dev = urb->context;
 
+	if (dev->cmd_cancel) {
+		dev->cmd_cancel = false;
+		complete(&dev->cmd_cancel_done);
+	}
+
 	switch (urb->status) {
 	case 0:
 		break; /* success */
@@ -985,6 +1050,10 @@ static int port100_switch_rf(struct nfc_digital_dev *ddev, bool on)
 
 	*skb_put(skb, 1) = on ? 1 : 0;
 
+	/* Cancel the last command if the device is being switched off */
+	if (!on)
+		port100_abort_cmd(ddev);
+
 	resp = port100_send_cmd_sync(dev, PORT100_CMD_SWITCH_RF, skb);
 
 	if (IS_ERR(resp))
@@ -1430,6 +1499,7 @@ static int port100_probe(struct usb_interface *interface,
 	if (!dev)
 		return -ENOMEM;
 
+	mutex_init(&dev->out_urb_lock);
 	dev->udev = usb_get_dev(interface_to_usbdev(interface));
 	dev->interface = interface;
 	usb_set_intfdata(interface, dev);
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c
index 10842b7051b3..26c9dbbccb0c 100644
--- a/drivers/nfc/trf7970a.c
+++ b/drivers/nfc/trf7970a.c
@@ -1048,6 +1048,10 @@ static int trf7970a_init(struct trf7970a *trf)
 	if (ret)
 		goto err_out;
 
+	ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
+	if (ret)
+		goto err_out;
+
 	usleep_range(1000, 2000);
 
 	trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;