NFC: pn533: Separate physical layer from the core implementation

The driver now has all core stuff isolated in one file, and all
the hardware link specifics in another. Writing a pn533 driver
on top of another hardware link is now just a matter of adding a
new file for that new hardware specifics.

The first user of this separation will be the i2c based pn532
driver that reuses pn533 core implementation on top of an i2c
layer.

Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

5 files changed, 3500 insertions, 0 deletions

diff --git a/drivers/nfc/pn533/Kconfig b/drivers/nfc/pn533/Kconfig
new file mode 100644
index 000000000000..b5a926e42f7b
--- /dev/null
+++ b/drivers/nfc/pn533/Kconfig
@@ -0,0 +1,16 @@
+config NFC_PN533
+	tristate
+	help
+	  NXP PN533 core driver.
+	  This driver provides core functionality for NXP PN533 NFC devices.
+
+config NFC_PN533_USB
+	tristate "NFC PN533 device support (USB)"
+	depends on USB
+	select NFC_PN533
+	---help---
+	  This module adds support for the NXP pn533 USB interface.
+	  Select this if your platform is using the USB bus.
+
+	  If you choose to build a module, it'll be called pn533_usb.
+	  Say N if unsure.
diff --git a/drivers/nfc/pn533/Makefile b/drivers/nfc/pn533/Makefile
new file mode 100644
index 000000000000..12c6be481483
--- /dev/null
+++ b/drivers/nfc/pn533/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for PN533 NFC driver
+#
+pn533_usb-objs  = usb.o
+
+obj-$(CONFIG_NFC_PN533)     += pn533.o
+obj-$(CONFIG_NFC_PN533_USB) += pn533_usb.o
diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
new file mode 100644
index 000000000000..52d83fec5add
--- /dev/null
+++ b/drivers/nfc/pn533/pn533.c
@@ -0,0 +1,2644 @@
+/*
+ * Driver for NXP PN533 NFC Chip - core functions
+ *
+ * Copyright (C) 2011 Instituto Nokia de Tecnologia
+ * Copyright (C) 2012-2013 Tieto Poland
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/nfc.h>
+#include <linux/netdevice.h>
+#include <net/nfc/nfc.h>
+#include "pn533.h"
+
+#define VERSION "0.3"
+
+/* How much time we spend listening for initiators */
+#define PN533_LISTEN_TIME 2
+/* Delay between each poll frame (ms) */
+#define PN533_POLL_INTERVAL 10
+
+/* structs for pn533 commands */
+
+/* PN533_CMD_GET_FIRMWARE_VERSION */
+struct pn533_fw_version {
+	u8 ic;
+	u8 ver;
+	u8 rev;
+	u8 support;
+};
+
+/* PN533_CMD_RF_CONFIGURATION */
+#define PN533_CFGITEM_RF_FIELD    0x01
+#define PN533_CFGITEM_TIMING      0x02
+#define PN533_CFGITEM_MAX_RETRIES 0x05
+#define PN533_CFGITEM_PASORI      0x82
+
+#define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
+#define PN533_CFGITEM_RF_FIELD_ON        0x1
+#define PN533_CFGITEM_RF_FIELD_OFF       0x0
+
+#define PN533_CONFIG_TIMING_102 0xb
+#define PN533_CONFIG_TIMING_204 0xc
+#define PN533_CONFIG_TIMING_409 0xd
+#define PN533_CONFIG_TIMING_819 0xe
+
+#define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
+#define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
+
+struct pn533_config_max_retries {
+	u8 mx_rty_atr;
+	u8 mx_rty_psl;
+	u8 mx_rty_passive_act;
+} __packed;
+
+struct pn533_config_timing {
+	u8 rfu;
+	u8 atr_res_timeout;
+	u8 dep_timeout;
+} __packed;
+
+/* PN533_CMD_IN_LIST_PASSIVE_TARGET */
+
+/* felica commands opcode */
+#define PN533_FELICA_OPC_SENSF_REQ 0
+#define PN533_FELICA_OPC_SENSF_RES 1
+/* felica SENSF_REQ parameters */
+#define PN533_FELICA_SENSF_SC_ALL 0xFFFF
+#define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
+#define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
+#define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
+
+/* type B initiator_data values */
+#define PN533_TYPE_B_AFI_ALL_FAMILIES 0
+#define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
+#define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
+
+union pn533_cmd_poll_initdata {
+	struct {
+		u8 afi;
+		u8 polling_method;
+	} __packed type_b;
+	struct {
+		u8 opcode;
+		__be16 sc;
+		u8 rc;
+		u8 tsn;
+	} __packed felica;
+};
+
+struct pn533_poll_modulations {
+	struct {
+		u8 maxtg;
+		u8 brty;
+		union pn533_cmd_poll_initdata initiator_data;
+	} __packed data;
+	u8 len;
+};
+
+static const struct pn533_poll_modulations poll_mod[] = {
+	[PN533_POLL_MOD_106KBPS_A] = {
+		.data = {
+			.maxtg = 1,
+			.brty = 0,
+		},
+		.len = 2,
+	},
+	[PN533_POLL_MOD_212KBPS_FELICA] = {
+		.data = {
+			.maxtg = 1,
+			.brty = 1,
+			.initiator_data.felica = {
+				.opcode = PN533_FELICA_OPC_SENSF_REQ,
+				.sc = PN533_FELICA_SENSF_SC_ALL,
+				.rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
+				.tsn = 0x03,
+			},
+		},
+		.len = 7,
+	},
+	[PN533_POLL_MOD_424KBPS_FELICA] = {
+		.data = {
+			.maxtg = 1,
+			.brty = 2,
+			.initiator_data.felica = {
+				.opcode = PN533_FELICA_OPC_SENSF_REQ,
+				.sc = PN533_FELICA_SENSF_SC_ALL,
+				.rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
+				.tsn = 0x03,
+			},
+		 },
+		.len = 7,
+	},
+	[PN533_POLL_MOD_106KBPS_JEWEL] = {
+		.data = {
+			.maxtg = 1,
+			.brty = 4,
+		},
+		.len = 2,
+	},
+	[PN533_POLL_MOD_847KBPS_B] = {
+		.data = {
+			.maxtg = 1,
+			.brty = 8,
+			.initiator_data.type_b = {
+				.afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
+				.polling_method =
+					PN533_TYPE_B_POLL_METHOD_TIMESLOT,
+			},
+		},
+		.len = 3,
+	},
+	[PN533_LISTEN_MOD] = {
+		.len = 0,
+	},
+};
+
+/* PN533_CMD_IN_ATR */
+
+struct pn533_cmd_activate_response {
+	u8 status;
+	u8 nfcid3t[10];
+	u8 didt;
+	u8 bst;
+	u8 brt;
+	u8 to;
+	u8 ppt;
+	/* optional */
+	u8 gt[];
+} __packed;
+
+struct pn533_cmd_jump_dep_response {
+	u8 status;
+	u8 tg;
+	u8 nfcid3t[10];
+	u8 didt;
+	u8 bst;
+	u8 brt;
+	u8 to;
+	u8 ppt;
+	/* optional */
+	u8 gt[];
+} __packed;
+
+
+/* PN533_TG_INIT_AS_TARGET */
+#define PN533_INIT_TARGET_PASSIVE 0x1
+#define PN533_INIT_TARGET_DEP 0x2
+
+#define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
+#define PN533_INIT_TARGET_RESP_ACTIVE     0x1
+#define PN533_INIT_TARGET_RESP_DEP        0x4
+
+/* The rule: value(high byte) + value(low byte) + checksum = 0 */
+static inline u8 pn533_ext_checksum(u16 value)
+{
+	return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
+}
+
+/* The rule: value + checksum = 0 */
+static inline u8 pn533_std_checksum(u8 value)
+{
+	return ~value + 1;
+}
+
+/* The rule: sum(data elements) + checksum = 0 */
+static u8 pn533_std_data_checksum(u8 *data, int datalen)
+{
+	u8 sum = 0;
+	int i;
+
+	for (i = 0; i < datalen; i++)
+		sum += data[i];
+
+	return pn533_std_checksum(sum);
+}
+
+static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
+{
+	struct pn533_std_frame *frame = _frame;
+
+	frame->preamble = 0;
+	frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
+	PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
+	PN533_FRAME_CMD(frame) = cmd_code;
+	frame->datalen = 2;
+}
+
+static void pn533_std_tx_frame_finish(void *_frame)
+{
+	struct pn533_std_frame *frame = _frame;
+
+	frame->datalen_checksum = pn533_std_checksum(frame->datalen);
+
+	PN533_STD_FRAME_CHECKSUM(frame) =
+		pn533_std_data_checksum(frame->data, frame->datalen);
+
+	PN533_STD_FRAME_POSTAMBLE(frame) = 0;
+}
+
+static void pn533_std_tx_update_payload_len(void *_frame, int len)
+{
+	struct pn533_std_frame *frame = _frame;
+
+	frame->datalen += len;
+}
+
+static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
+{
+	u8 checksum;
+	struct pn533_std_frame *stdf = _frame;
+
+	if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
+		return false;
+
+	if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
+		/* Standard frame code */
+		dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
+
+		checksum = pn533_std_checksum(stdf->datalen);
+		if (checksum != stdf->datalen_checksum)
+			return false;
+
+		checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
+		if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
+			return false;
+	} else {
+		/* Extended */
+		struct pn533_ext_frame *eif = _frame;
+
+		dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
+
+		checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
+		if (checksum != eif->datalen_checksum)
+			return false;
+
+		/* check data checksum */
+		checksum = pn533_std_data_checksum(eif->data,
+						   be16_to_cpu(eif->datalen));
+		if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
+			return false;
+	}
+
+	return true;
+}
+
+bool pn533_rx_frame_is_ack(void *_frame)
+{
+	struct pn533_std_frame *frame = _frame;
+
+	if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
+		return false;
+
+	if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
+		return false;
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
+
+static inline int pn533_std_rx_frame_size(void *frame)
+{
+	struct pn533_std_frame *f = frame;
+
+	/* check for Extended Information frame */
+	if (PN533_STD_IS_EXTENDED(f)) {
+		struct pn533_ext_frame *eif = frame;
+
+		return sizeof(struct pn533_ext_frame)
+			+ be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
+	}
+
+	return sizeof(struct pn533_std_frame) + f->datalen +
+	       PN533_STD_FRAME_TAIL_LEN;
+}
+
+static u8 pn533_std_get_cmd_code(void *frame)
+{
+	struct pn533_std_frame *f = frame;
+	struct pn533_ext_frame *eif = frame;
+
+	if (PN533_STD_IS_EXTENDED(f))
+		return PN533_FRAME_CMD(eif);
+	else
+		return PN533_FRAME_CMD(f);
+}
+
+bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
+{
+	return (dev->ops->get_cmd_code(frame) ==
+				PN533_CMD_RESPONSE(dev->cmd->code));
+}
+EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
+
+
+static struct pn533_frame_ops pn533_std_frame_ops = {
+	.tx_frame_init = pn533_std_tx_frame_init,
+	.tx_frame_finish = pn533_std_tx_frame_finish,
+	.tx_update_payload_len = pn533_std_tx_update_payload_len,
+	.tx_header_len = PN533_STD_FRAME_HEADER_LEN,
+	.tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
+
+	.rx_is_frame_valid = pn533_std_rx_frame_is_valid,
+	.rx_frame_size = pn533_std_rx_frame_size,
+	.rx_header_len = PN533_STD_FRAME_HEADER_LEN,
+	.rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
+
+	.max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
+	.get_cmd_code = pn533_std_get_cmd_code,
+};
+
+static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
+				  struct sk_buff *skb)
+{
+	/* payload is already there, just update datalen */
+	int payload_len = skb->len;
+	struct pn533_frame_ops *ops = dev->ops;
+
+
+	skb_push(skb, ops->tx_header_len);
+	skb_put(skb, ops->tx_tail_len);
+
+	ops->tx_frame_init(skb->data, cmd_code);
+	ops->tx_update_payload_len(skb->data, payload_len);
+	ops->tx_frame_finish(skb->data);
+}
+
+static int pn533_send_async_complete(struct pn533 *dev)
+{
+	struct pn533_cmd *cmd = dev->cmd;
+	int status = cmd->status;
+
+	struct sk_buff *req = cmd->req;
+	struct sk_buff *resp = cmd->resp;
+
+	int rc;
+
+	dev_kfree_skb(req);
+
+	if (status < 0) {
+		rc = cmd->complete_cb(dev, cmd->complete_cb_context,
+				      ERR_PTR(status));
+		dev_kfree_skb(resp);
+		goto done;
+	}
+
+	skb_pull(resp, dev->ops->rx_header_len);
+	skb_trim(resp, resp->len - dev->ops->rx_tail_len);
+
+	rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
+
+done:
+	kfree(cmd);
+	dev->cmd = NULL;
+	return rc;
+}
+
+static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
+			      struct sk_buff *req,
+			      pn533_send_async_complete_t complete_cb,
+			      void *complete_cb_context)
+{
+	struct pn533_cmd *cmd;
+	int rc = 0;
+
+	dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
+
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	cmd->code = cmd_code;
+	cmd->req = req;
+	cmd->complete_cb = complete_cb;
+	cmd->complete_cb_context = complete_cb_context;
+
+	pn533_build_cmd_frame(dev, cmd_code, req);
+
+	mutex_lock(&dev->cmd_lock);
+
+	if (!dev->cmd_pending) {
+		rc = dev->phy_ops->send_frame(dev, req);
+		if (rc)
+			goto error;
+
+		dev->cmd_pending = 1;
+		dev->cmd = cmd;
+		goto unlock;
+	}
+
+	dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
+		__func__, cmd_code);
+
+	INIT_LIST_HEAD(&cmd->queue);
+	list_add_tail(&cmd->queue, &dev->cmd_queue);
+
+	goto unlock;
+
+error:
+	kfree(cmd);
+unlock:
+	mutex_unlock(&dev->cmd_lock);
+	return rc;
+}
+
+static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
+				 struct sk_buff *req,
+				 pn533_send_async_complete_t complete_cb,
+				 void *complete_cb_context)
+{
+	int rc;
+
+	rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
+				complete_cb_context);
+
+	return rc;
+}
+
+static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
+				struct sk_buff *req,
+				pn533_send_async_complete_t complete_cb,
+				void *complete_cb_context)
+{
+	int rc;
+
+	rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
+				complete_cb_context);
+
+	return rc;
+}
+
+/*
+ * pn533_send_cmd_direct_async
+ *
+ * The function sends a piority cmd directly to the chip omiting the cmd
+ * queue. It's intended to be used by chaining mechanism of received responses
+ * where the host has to request every single chunk of data before scheduling
+ * next cmd from the queue.
+ */
+static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
+				       struct sk_buff *req,
+				       pn533_send_async_complete_t complete_cb,
+				       void *complete_cb_context)
+{
+	struct pn533_cmd *cmd;
+	int rc;
+
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	cmd->code = cmd_code;
+	cmd->req = req;
+	cmd->complete_cb = complete_cb;
+	cmd->complete_cb_context = complete_cb_context;
+
+	pn533_build_cmd_frame(dev, cmd_code, req);
+
+	rc = dev->phy_ops->send_frame(dev, req);
+	if (rc < 0)
+		kfree(cmd);
+	else
+		dev->cmd = cmd;
+
+	return rc;
+}
+
+static void pn533_wq_cmd_complete(struct work_struct *work)
+{
+	struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
+	int rc;
+
+	rc = pn533_send_async_complete(dev);
+	if (rc != -EINPROGRESS)
+		queue_work(dev->wq, &dev->cmd_work);
+}
+
+static void pn533_wq_cmd(struct work_struct *work)
+{
+	struct pn533 *dev = container_of(work, struct pn533, cmd_work);
+	struct pn533_cmd *cmd;
+	int rc;
+
+	mutex_lock(&dev->cmd_lock);
+
+	if (list_empty(&dev->cmd_queue)) {
+		dev->cmd_pending = 0;
+		mutex_unlock(&dev->cmd_lock);
+		return;
+	}
+
+	cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
+
+	list_del(&cmd->queue);
+
+	mutex_unlock(&dev->cmd_lock);
+
+	rc = dev->phy_ops->send_frame(dev, cmd->req);
+	if (rc < 0) {
+		dev_kfree_skb(cmd->req);
+		kfree(cmd);
+		return;
+	}
+
+	dev->cmd = cmd;
+}
+
+struct pn533_sync_cmd_response {
+	struct sk_buff *resp;
+	struct completion done;
+};
+
+static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
+				    struct sk_buff *resp)
+{
+	struct pn533_sync_cmd_response *arg = _arg;
+
+	arg->resp = resp;
+	complete(&arg->done);
+
+	return 0;
+}
+
+/*  pn533_send_cmd_sync
+ *
+ *  Please note the req parameter is freed inside the function to
+ *  limit a number of return value interpretations by the caller.
+ *
+ *  1. negative in case of error during TX path -> req should be freed
+ *
+ *  2. negative in case of error during RX path -> req should not be freed
+ *     as it's been already freed at the beginning of RX path by
+ *     async_complete_cb.
+ *
+ *  3. valid pointer in case of succesfult RX path
+ *
+ *  A caller has to check a return value with IS_ERR macro. If the test pass,
+ *  the returned pointer is valid.
+ *
+ */
+static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
+					       struct sk_buff *req)
+{
+	int rc;
+	struct pn533_sync_cmd_response arg;
+
+	init_completion(&arg.done);
+
+	rc = pn533_send_cmd_async(dev, cmd_code, req,
+				  pn533_send_sync_complete, &arg);
+	if (rc) {
+		dev_kfree_skb(req);
+		return ERR_PTR(rc);
+	}
+
+	wait_for_completion(&arg.done);
+
+	return arg.resp;
+}
+
+static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
+{
+	struct sk_buff *skb;
+
+	skb = alloc_skb(dev->ops->tx_header_len +
+			size +
+			dev->ops->tx_tail_len, GFP_KERNEL);
+
+	if (skb)
+		skb_reserve(skb, dev->ops->tx_header_len);
+
+	return skb;
+}
+
+struct pn533_target_type_a {
+	__be16 sens_res;
+	u8 sel_res;
+	u8 nfcid_len;
+	u8 nfcid_data[];
+} __packed;
+
+
+#define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
+#define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
+#define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
+
+#define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
+#define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
+
+#define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
+#define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
+
+#define PN533_TYPE_A_SEL_PROT_MIFARE 0
+#define PN533_TYPE_A_SEL_PROT_ISO14443 1
+#define PN533_TYPE_A_SEL_PROT_DEP 2
+#define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
+
+static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
+							int target_data_len)
+{
+	u8 ssd;
+	u8 platconf;
+
+	if (target_data_len < sizeof(struct pn533_target_type_a))
+		return false;
+
+	/*
+	 * The length check of nfcid[] and ats[] are not being performed because
+	 * the values are not being used
+	 */
+
+	/* Requirement 4.6.3.3 from NFC Forum Digital Spec */
+	ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
+	platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
+
+	if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
+	     platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
+	    (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
+	     platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
+		return false;
+
+	/* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
+	if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
+		return false;
+
+	return true;
+}
+
+static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
+							int tgt_data_len)
+{
+	struct pn533_target_type_a *tgt_type_a;
+
+	tgt_type_a = (struct pn533_target_type_a *)tgt_data;
+
+	if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
+		return -EPROTO;
+
+	switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
+	case PN533_TYPE_A_SEL_PROT_MIFARE:
+		nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
+		break;
+	case PN533_TYPE_A_SEL_PROT_ISO14443:
+		nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
+		break;
+	case PN533_TYPE_A_SEL_PROT_DEP:
+		nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
+		break;
+	case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
+		nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
+							NFC_PROTO_NFC_DEP_MASK;
+		break;
+	}
+
+	nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
+	nfc_tgt->sel_res = tgt_type_a->sel_res;
+	nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
+	memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
+
+	return 0;
+}
+
+struct pn533_target_felica {
+	u8 pol_res;
+	u8 opcode;
+	u8 nfcid2[NFC_NFCID2_MAXSIZE];
+	u8 pad[8];
+	/* optional */
+	u8 syst_code[];
+} __packed;
+
+#define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
+#define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
+
+static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
+							int target_data_len)
+{
+	if (target_data_len < sizeof(struct pn533_target_felica))
+		return false;
+
+	if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
+		return false;
+
+	return true;
+}
+
+static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
+							int tgt_data_len)
+{
+	struct pn533_target_felica *tgt_felica;
+
+	tgt_felica = (struct pn533_target_felica *)tgt_data;
+
+	if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
+		return -EPROTO;
+
+	if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
+	    (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
+		nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
+	else
+		nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
+
+	memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
+	nfc_tgt->sensf_res_len = 9;
+
+	memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
+	nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
+
+	return 0;
+}
+
+struct pn533_target_jewel {
+	__be16 sens_res;
+	u8 jewelid[4];
+} __packed;
+
+static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
+							int target_data_len)
+{
+	u8 ssd;
+	u8 platconf;
+
+	if (target_data_len < sizeof(struct pn533_target_jewel))
+		return false;
+
+	/* Requirement 4.6.3.3 from NFC Forum Digital Spec */
+	ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
+	platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
+
+	if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
+	     platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
+	    (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
+	     platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
+		return false;
+
+	return true;
+}
+
+static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
+							int tgt_data_len)
+{
+	struct pn533_target_jewel *tgt_jewel;
+
+	tgt_jewel = (struct pn533_target_jewel *)tgt_data;
+
+	if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
+		return -EPROTO;
+
+	nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
+	nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
+	nfc_tgt->nfcid1_len = 4;
+	memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
+
+	return 0;
+}
+
+struct pn533_type_b_prot_info {
+	u8 bitrate;
+	u8 fsci_type;
+	u8 fwi_adc_fo;
+} __packed;
+
+#define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
+#define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
+#define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
+
+struct pn533_type_b_sens_res {
+	u8 opcode;
+	u8 nfcid[4];
+	u8 appdata[4];
+	struct pn533_type_b_prot_info prot_info;
+} __packed;
+
+#define PN533_TYPE_B_OPC_SENSB_RES 0x50
+
+struct pn533_target_type_b {
+	struct pn533_type_b_sens_res sensb_res;
+	u8 attrib_res_len;
+	u8 attrib_res[];
+} __packed;
+
+static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
+							int target_data_len)
+{
+	if (target_data_len < sizeof(struct pn533_target_type_b))
+		return false;
+
+	if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
+		return false;
+
+	if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
+						PN533_TYPE_B_PROT_TYPE_RFU_MASK)
+		return false;
+
+	return true;
+}
+
+static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
+							int tgt_data_len)
+{
+	struct pn533_target_type_b *tgt_type_b;
+
+	tgt_type_b = (struct pn533_target_type_b *)tgt_data;
+
+	if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
+		return -EPROTO;
+
+	nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
+
+	return 0;
+}
+
+static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
+			      int tgdata_len)
+{
+	struct nfc_target nfc_tgt;
+	int rc;
+
+	dev_dbg(dev->dev, "%s: modulation=%d\n",
+		__func__, dev->poll_mod_curr);
+
+	if (tg != 1)
+		return -EPROTO;
+
+	memset(&nfc_tgt, 0, sizeof(struct nfc_target));
+
+	switch (dev->poll_mod_curr) {
+	case PN533_POLL_MOD_106KBPS_A:
+		rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
+		break;
+	case PN533_POLL_MOD_212KBPS_FELICA:
+	case PN533_POLL_MOD_424KBPS_FELICA:
+		rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
+		break;
+	case PN533_POLL_MOD_106KBPS_JEWEL:
+		rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
+		break;
+	case PN533_POLL_MOD_847KBPS_B:
+		rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
+		break;
+	default:
+		nfc_err(dev->dev,
+			"Unknown current poll modulation\n");
+		return -EPROTO;
+	}
+
+	if (rc)
+		return rc;
+
+	if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
+		dev_dbg(dev->dev,
+			"The Tg found doesn't have the desired protocol\n");
+		return -EAGAIN;
+	}
+
+	dev_dbg(dev->dev,
+		"Target found - supported protocols: 0x%x\n",
+		nfc_tgt.supported_protocols);
+
+	dev->tgt_available_prots = nfc_tgt.supported_protocols;
+
+	nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
+
+	return 0;
+}
+
+static inline void pn533_poll_next_mod(struct pn533 *dev)
+{
+	dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
+}
+
+static void pn533_poll_reset_mod_list(struct pn533 *dev)
+{
+	dev->poll_mod_count = 0;
+}
+
+static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
+{
+	dev->poll_mod_active[dev->poll_mod_count] =
+		(struct pn533_poll_modulations *)&poll_mod[mod_index];
+	dev->poll_mod_count++;
+}
+
+static void pn533_poll_create_mod_list(struct pn533 *dev,
+				       u32 im_protocols, u32 tm_protocols)
+{
+	pn533_poll_reset_mod_list(dev);
+
+	if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
+	    (im_protocols & NFC_PROTO_ISO14443_MASK) ||
+	    (im_protocols & NFC_PROTO_NFC_DEP_MASK))
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
+
+	if (im_protocols & NFC_PROTO_FELICA_MASK ||
+	    im_protocols & NFC_PROTO_NFC_DEP_MASK) {
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
+	}
+
+	if (im_protocols & NFC_PROTO_JEWEL_MASK)
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
+
+	if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
+
+	if (tm_protocols)
+		pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
+}
+
+static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
+{
+	u8 nbtg, tg, *tgdata;
+	int rc, tgdata_len;
+
+	/* Toggle the DEP polling */
+	if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
+		dev->poll_dep = 1;
+
+	nbtg = resp->data[0];
+	tg = resp->data[1];
+	tgdata = &resp->data[2];
+	tgdata_len = resp->len - 2;  /* nbtg + tg */
+
+	if (nbtg) {
+		rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
+
+		/* We must stop the poll after a valid target found */
+		if (rc == 0) {
+			pn533_poll_reset_mod_list(dev);
+			return 0;
+		}
+	}
+
+	return -EAGAIN;
+}
+
+static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
+{
+	struct sk_buff *skb;
+	u8 *felica, *nfcid3, *gb;
+
+	u8 *gbytes = dev->gb;
+	size_t gbytes_len = dev->gb_len;
+
+	u8 felica_params[18] = {0x1, 0xfe, /* DEP */
+				0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
+				0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+				0xff, 0xff}; /* System code */
+
+	u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
+			       0x0, 0x0, 0x0,
+			       0x40}; /* SEL_RES for DEP */
+
+	unsigned int skb_len = 36 + /*
+				     * mode (1), mifare (6),
+				     * felica (18), nfcid3 (10), gb_len (1)
+				     */
+			       gbytes_len +
+			       1;  /* len Tk*/
+
+	skb = pn533_alloc_skb(dev, skb_len);
+	if (!skb)
+		return NULL;
+
+	/* DEP support only */
+	*skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
+
+	/* MIFARE params */
+	memcpy(skb_put(skb, 6), mifare_params, 6);
+
+	/* Felica params */
+	felica = skb_put(skb, 18);
+	memcpy(felica, felica_params, 18);
+	get_random_bytes(felica + 2, 6);
+
+	/* NFCID3 */
+	nfcid3 = skb_put(skb, 10);
+	memset(nfcid3, 0, 10);
+	memcpy(nfcid3, felica, 8);
+
+	/* General bytes */
+	*skb_put(skb, 1) = gbytes_len;
+
+	gb = skb_put(skb, gbytes_len);
+	memcpy(gb, gbytes, gbytes_len);
+
+	/* Len Tk */
+	*skb_put(skb, 1) = 0;
+
+	return skb;
+}
+
+static void pn533_wq_tm_mi_recv(struct work_struct *work);
+static struct sk_buff *pn533_build_response(struct pn533 *dev);
+
+static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
+				      struct sk_buff *resp)
+{
+	struct sk_buff *skb;
+	u8 status, ret, mi;
+	int rc;
+
+	dev_dbg(dev->dev, "%s\n", __func__);
+
+	if (IS_ERR(resp)) {
+		skb_queue_purge(&dev->resp_q);
+		return PTR_ERR(resp);
+	}
+
+	status = resp->data[0];
+
+	ret = status & PN533_CMD_RET_MASK;
+	mi = status & PN533_CMD_MI_MASK;
+
+	skb_pull(resp, sizeof(status));
+
+	if (ret != PN533_CMD_RET_SUCCESS) {
+		rc = -EIO;
+		goto error;
+	}
+
+	skb_queue_tail(&dev->resp_q, resp);
+
+	if (mi) {
+		queue_work(dev->wq, &dev->mi_tm_rx_work);
+		return -EINPROGRESS;
+	}
+
+	skb = pn533_build_response(dev);
+	if (!skb) {
+		rc = -EIO;
+		goto error;
+	}
+
+	return nfc_tm_data_received(dev->nfc_dev, skb);
+
+error:
+	nfc_tm_deactivated(dev->nfc_dev);
+	dev->tgt_mode = 0;
+	skb_queue_purge(&dev->resp_q);
+	dev_kfree_skb(resp);
+
+	return rc;
+}
+
+static void pn533_wq_tm_mi_recv(struct work_struct *work)
+{
+	struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
+	struct sk_buff *skb;
+	int rc;
+
+	dev_dbg(dev->dev, "%s\n", __func__);
+
+	skb = pn533_alloc_skb(dev, 0);
+	if (!skb)
+		return;
+
+	rc = pn533_send_cmd_direct_async(dev,
+					PN533_CMD_TG_GET_DATA,
+					skb,
+					pn533_tm_get_data_complete,
+					NULL);
+
+	if (rc < 0)
+		dev_kfree_skb(skb);
+}
+
+static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
+				  struct sk_buff *resp);
+static void pn533_wq_tm_mi_send(struct work_struct *work)
+{
+	struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
+	struct sk_buff *skb;
+	int rc;
+
+	dev_dbg(dev->dev, "%s\n", __func__);
+
+	/* Grab the first skb in the queue */
+	skb = skb_dequeue(&dev->fragment_skb);
+	if (skb == NULL) {	/* No more data */
+		/* Reset the queue for future use */
+		skb_queue_head_init(&dev->fragment_skb);
+		goto error;
+	}
+
+	/* last entry - remove MI bit */
+	if (skb_queue_len(&dev->fragment_skb) == 0) {
+		rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
+					skb, pn533_tm_send_complete, NULL);
+	} else
+		rc = pn533_send_cmd_direct_async(dev,
+					PN533_CMD_TG_SET_META_DATA,
+					skb, pn533_tm_send_complete, NULL);
+
+	if (rc == 0) /* success */
+		return;
+
+	dev_err(dev->dev,
+		"Error %d when trying to perform set meta data_exchange", rc);
+
+	dev_kfree_skb(skb);