dirty fix to merging

5 files changed, 3340 insertions, 0 deletions

diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
new file mode 100644
index 00000000..5af95927
--- /dev/null
+++ b/drivers/nfc/Kconfig
@@ -0,0 +1,41 @@
+#
+# Near Field Communication (NFC) devices
+#
+
+menu "Near Field Communication (NFC) devices"
+	depends on NFC
+
+config PN544_NFC
+	tristate "PN544 NFC driver"
+	depends on I2C
+	select CRC_CCITT
+	default n
+	---help---
+	  Say yes if you want PN544 Near Field Communication driver.
+	  This is for i2c connected version. If unsure, say N here.
+
+	  To compile this driver as a module, choose m here. The module will
+	  be called pn544.
+
+config NFC_PN533
+	tristate "NXP PN533 USB driver"
+	depends on USB
+	help
+	  NXP PN533 USB driver.
+	  This driver provides support for NFC NXP PN533 devices.
+
+	  Say Y here to compile support for PN533 devices into the
+	  kernel or say M to compile it as module (pn533).
+
+config NFC_WILINK
+	tristate "Texas Instruments NFC WiLink driver"
+	depends on TI_ST && NFC_NCI
+	help
+	  This enables the NFC driver for Texas Instrument's BT/FM/GPS/NFC
+	  combo devices. This makes use of shared transport line discipline
+	  core driver to communicate with the NFC core of the combo chip.
+
+	  Say Y here to compile support for Texas Instrument's NFC WiLink driver
+	  into the kernel or say M to compile it as module.
+
+endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
new file mode 100644
index 00000000..ab99e857
--- /dev/null
+++ b/drivers/nfc/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for nfc devices
+#
+
+obj-$(CONFIG_PN544_NFC)		+= pn544.o
+obj-$(CONFIG_NFC_PN533)		+= pn533.o
+obj-$(CONFIG_NFC_WILINK)	+= nfcwilink.o
+
+ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
diff --git a/drivers/nfc/nfcwilink.c b/drivers/nfc/nfcwilink.c
new file mode 100644
index 00000000..1f74a77d
--- /dev/null
+++ b/drivers/nfc/nfcwilink.c
@@ -0,0 +1,626 @@
+/*
+ *  Texas Instrument's NFC Driver For Shared Transport.
+ *
+ *  NFC Driver acts as interface between NCI core and
+ *  TI Shared Transport Layer.
+ *
+ *  Copyright (C) 2011 Texas Instruments, Inc.
+ *
+ *  Written by Ilan Elias <ilane@ti.com>
+ *
+ *  Acknowledgements:
+ *  This file is based on btwilink.c, which was written
+ *  by Raja Mani and Pavan Savoy.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/firmware.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+#include <linux/ti_wilink_st.h>
+
+#define NFCWILINK_CHNL			12
+#define NFCWILINK_OPCODE		7
+#define NFCWILINK_MAX_FRAME_SIZE	300
+#define NFCWILINK_HDR_LEN		4
+#define NFCWILINK_OFFSET_LEN_IN_HDR	1
+#define NFCWILINK_LEN_SIZE		2
+#define NFCWILINK_REGISTER_TIMEOUT	8000	/* 8 sec */
+#define NFCWILINK_CMD_TIMEOUT		5000	/* 5 sec */
+
+#define BTS_FILE_NAME_MAX_SIZE		40
+#define BTS_FILE_HDR_MAGIC		0x42535442
+#define BTS_FILE_CMD_MAX_LEN		0xff
+#define BTS_FILE_ACTION_TYPE_SEND_CMD	1
+
+#define NCI_VS_NFCC_INFO_CMD_GID	0x2f
+#define NCI_VS_NFCC_INFO_CMD_OID	0x12
+#define NCI_VS_NFCC_INFO_RSP_GID	0x4f
+#define NCI_VS_NFCC_INFO_RSP_OID	0x12
+
+struct nfcwilink_hdr {
+	__u8 chnl;
+	__u8 opcode;
+	__le16 len;
+} __packed;
+
+struct nci_vs_nfcc_info_cmd {
+	__u8 gid;
+	__u8 oid;
+	__u8 plen;
+} __packed;
+
+struct nci_vs_nfcc_info_rsp {
+	__u8 gid;
+	__u8 oid;
+	__u8 plen;
+	__u8 status;
+	__u8 hw_id;
+	__u8 sw_ver_x;
+	__u8 sw_ver_z;
+	__u8 patch_id;
+} __packed;
+
+struct bts_file_hdr {
+	__le32 magic;
+	__le32 ver;
+	__u8 rfu[24];
+	__u8 actions[0];
+} __packed;
+
+struct bts_file_action {
+	__le16 type;
+	__le16 len;
+	__u8 data[0];
+} __packed;
+
+struct nfcwilink {
+	struct platform_device		*pdev;
+	struct nci_dev			*ndev;
+	unsigned long			flags;
+
+	char				st_register_cb_status;
+	long				(*st_write) (struct sk_buff *);
+
+	struct completion		completed;
+
+	struct nci_vs_nfcc_info_rsp	nfcc_info;
+};
+
+/* NFCWILINK driver flags */
+enum {
+	NFCWILINK_RUNNING,
+	NFCWILINK_FW_DOWNLOAD,
+};
+
+static int nfcwilink_send(struct sk_buff *skb);
+
+static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
+{
+	struct sk_buff *skb;
+
+	skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
+	if (skb)
+		skb_reserve(skb, NFCWILINK_HDR_LEN);
+
+	return skb;
+}
+
+static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
+						struct sk_buff *skb)
+{
+	struct nci_vs_nfcc_info_rsp *rsp = (void *)skb->data;
+
+	/* Detect NCI_VS_NFCC_INFO_RSP and store the result */
+	if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
+		(rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
+		memcpy(&drv->nfcc_info, rsp,
+			sizeof(struct nci_vs_nfcc_info_rsp));
+	}
+
+	kfree_skb(skb);
+
+	complete(&drv->completed);
+}
+
+static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
+{
+	struct nci_vs_nfcc_info_cmd *cmd;
+	struct sk_buff *skb;
+	unsigned long comp_ret;
+	int rc;
+
+	nfc_dev_dbg(&drv->pdev->dev, "get_bts_file_name entry");
+
+	skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
+					GFP_KERNEL);
+	if (!skb) {
+		nfc_dev_err(&drv->pdev->dev,
+				"no memory for nci_vs_nfcc_info_cmd");
+		return -ENOMEM;
+	}
+
+	skb->dev = (void *)drv->ndev;
+
+	cmd = (struct nci_vs_nfcc_info_cmd *)
+			skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
+	cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
+	cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
+	cmd->plen = 0;
+
+	drv->nfcc_info.plen = 0;
+
+	rc = nfcwilink_send(skb);
+	if (rc)
+		return rc;
+
+	comp_ret = wait_for_completion_timeout(&drv->completed,
+				msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
+	nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
+			comp_ret);
+	if (comp_ret == 0) {
+		nfc_dev_err(&drv->pdev->dev,
+				"timeout on wait_for_completion_timeout");
+		return -ETIMEDOUT;
+	}
+
+	nfc_dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d",
+			drv->nfcc_info.plen,
+			drv->nfcc_info.status);
+
+	if ((drv->nfcc_info.plen != 5) || (drv->nfcc_info.status != 0)) {
+		nfc_dev_err(&drv->pdev->dev,
+				"invalid nci_vs_nfcc_info_rsp");
+		return -EINVAL;
+	}
+
+	snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
+			"TINfcInit_%d.%d.%d.%d.bts",
+			drv->nfcc_info.hw_id,
+			drv->nfcc_info.sw_ver_x,
+			drv->nfcc_info.sw_ver_z,
+			drv->nfcc_info.patch_id);
+
+	nfc_dev_info(&drv->pdev->dev, "nfcwilink FW file name: %s", file_name);
+
+	return 0;
+}
+
+static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
+{
+	struct nfcwilink_hdr *hdr = (struct nfcwilink_hdr *)data;
+	struct sk_buff *skb;
+	unsigned long comp_ret;
+	int rc;
+
+	nfc_dev_dbg(&drv->pdev->dev, "send_bts_cmd entry");
+
+	/* verify valid cmd for the NFC channel */
+	if ((len <= sizeof(struct nfcwilink_hdr)) ||
+		(len > BTS_FILE_CMD_MAX_LEN) ||
+		(hdr->chnl != NFCWILINK_CHNL) ||
+		(hdr->opcode != NFCWILINK_OPCODE)) {
+		nfc_dev_err(&drv->pdev->dev,
+			"ignoring invalid bts cmd, len %d, chnl %d, opcode %d",
+			len, hdr->chnl, hdr->opcode);
+		return 0;
+	}
+
+	/* remove the ST header */
+	len -= sizeof(struct nfcwilink_hdr);
+	data += sizeof(struct nfcwilink_hdr);
+
+	skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
+	if (!skb) {
+		nfc_dev_err(&drv->pdev->dev, "no memory for bts cmd");
+		return -ENOMEM;
+	}
+
+	skb->dev = (void *)drv->ndev;
+
+	memcpy(skb_put(skb, len), data, len);
+
+	rc = nfcwilink_send(skb);
+	if (rc)
+		return rc;
+
+	comp_ret = wait_for_completion_timeout(&drv->completed,
+				msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
+	nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
+			comp_ret);
+	if (comp_ret == 0) {
+		nfc_dev_err(&drv->pdev->dev,
+				"timeout on wait_for_completion_timeout");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int nfcwilink_download_fw(struct nfcwilink *drv)
+{
+	unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
+	const struct firmware *fw;
+	__u16 action_type, action_len;
+	__u8 *ptr;
+	int len, rc;
+
+	nfc_dev_dbg(&drv->pdev->dev, "download_fw entry");
+
+	set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
+
+	rc = nfcwilink_get_bts_file_name(drv, file_name);
+	if (rc)
+		goto exit;
+
+	rc = request_firmware(&fw, file_name, &drv->pdev->dev);
+	if (rc) {
+		nfc_dev_err(&drv->pdev->dev, "request_firmware failed %d", rc);
+
+		/* if the file is not found, don't exit with failure */
+		if (rc == -ENOENT)
+			rc = 0;
+
+		goto exit;
+	}
+
+	len = fw->size;
+	ptr = (__u8 *)fw->data;
+
+	if ((len == 0) || (ptr == NULL)) {
+		nfc_dev_dbg(&drv->pdev->dev,
+				"request_firmware returned size %d", len);
+		goto release_fw;
+	}
+
+	if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
+			BTS_FILE_HDR_MAGIC) {
+		nfc_dev_err(&drv->pdev->dev, "wrong bts magic number");
+		rc = -EINVAL;
+		goto release_fw;
+	}
+
+	/* remove the BTS header */
+	len -= sizeof(struct bts_file_hdr);
+	ptr += sizeof(struct bts_file_hdr);
+
+	while (len > 0) {
+		action_type =
+			__le16_to_cpu(((struct bts_file_action *)ptr)->type);
+		action_len =
+			__le16_to_cpu(((struct bts_file_action *)ptr)->len);
+
+		nfc_dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d",
+				action_type, action_len);
+
+		switch (action_type) {
+		case BTS_FILE_ACTION_TYPE_SEND_CMD:
+			rc = nfcwilink_send_bts_cmd(drv,
+					((struct bts_file_action *)ptr)->data,
+					action_len);
+			if (rc)
+				goto release_fw;
+			break;
+		}
+
+		/* advance to the next action */
+		len -= (sizeof(struct bts_file_action) + action_len);
+		ptr += (sizeof(struct bts_file_action) + action_len);
+	}
+
+release_fw:
+	release_firmware(fw);
+
+exit:
+	clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
+	return rc;
+}
+
+/* Called by ST when registration is complete */
+static void nfcwilink_register_complete(void *priv_data, char data)
+{
+	struct nfcwilink *drv = priv_data;
+
+	nfc_dev_dbg(&drv->pdev->dev, "register_complete entry");
+
+	/* store ST registration status */
+	drv->st_register_cb_status = data;
+
+	/* complete the wait in nfc_st_open() */
+	complete(&drv->completed);
+}
+
+/* Called by ST when receive data is available */
+static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
+{
+	struct nfcwilink *drv = priv_data;
+	int rc;
+
+	nfc_dev_dbg(&drv->pdev->dev, "receive entry, len %d", skb->len);
+
+	if (!skb)
+		return -EFAULT;
+
+	if (!drv) {
+		kfree_skb(skb);
+		return -EFAULT;
+	}
+
+	/* strip the ST header
+	(apart for the chnl byte, which is not received in the hdr) */
+	skb_pull(skb, (NFCWILINK_HDR_LEN-1));
+
+	if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
+		nfcwilink_fw_download_receive(drv, skb);
+		return 0;
+	}
+
+	skb->dev = (void *) drv->ndev;
+
+	/* Forward skb to NCI core layer */
+	rc = nci_recv_frame(skb);
+	if (rc < 0) {
+		nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+/* protocol structure registered with ST */
+static struct st_proto_s nfcwilink_proto = {
+	.chnl_id = NFCWILINK_CHNL,
+	.max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
+	.hdr_len = (NFCWILINK_HDR_LEN-1),	/* not including chnl byte */
+	.offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
+	.len_size = NFCWILINK_LEN_SIZE,
+	.reserve = 0,
+	.recv = nfcwilink_receive,
+	.reg_complete_cb = nfcwilink_register_complete,
+	.write = NULL,
+};
+
+static int nfcwilink_open(struct nci_dev *ndev)
+{
+	struct nfcwilink *drv = nci_get_drvdata(ndev);
+	unsigned long comp_ret;
+	int rc;
+
+	nfc_dev_dbg(&drv->pdev->dev, "open entry");
+
+	if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
+		rc = -EBUSY;
+		goto exit;
+	}
+
+	nfcwilink_proto.priv_data = drv;
+
+	init_completion(&drv->completed);
+	drv->st_register_cb_status = -EINPROGRESS;
+
+	rc = st_register(&nfcwilink_proto);
+	if (rc < 0) {
+		if (rc == -EINPROGRESS) {
+			comp_ret = wait_for_completion_timeout(
+			&drv->completed,
+			msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));
+
+			nfc_dev_dbg(&drv->pdev->dev,
+			"wait_for_completion_timeout returned %ld",
+			comp_ret);
+
+			if (comp_ret == 0) {
+				/* timeout */
+				rc = -ETIMEDOUT;
+				goto clear_exit;
+			} else if (drv->st_register_cb_status != 0) {
+				rc = drv->st_register_cb_status;
+				nfc_dev_err(&drv->pdev->dev,
+				"st_register_cb failed %d", rc);
+				goto clear_exit;
+			}
+		} else {
+			nfc_dev_err(&drv->pdev->dev,
+				"st_register failed %d", rc);
+			goto clear_exit;
+		}
+	}
+
+	/* st_register MUST fill the write callback */
+	BUG_ON(nfcwilink_proto.write == NULL);
+	drv->st_write = nfcwilink_proto.write;
+
+	if (nfcwilink_download_fw(drv)) {
+		nfc_dev_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d",
+				rc);
+		/* open should succeed, even if the FW download failed */
+	}
+
+	goto exit;
+
+clear_exit:
+	clear_bit(NFCWILINK_RUNNING, &drv->flags);
+
+exit:
+	return rc;
+}
+
+static int nfcwilink_close(struct nci_dev *ndev)
+{
+	struct nfcwilink *drv = nci_get_drvdata(ndev);
+	int rc;
+
+	nfc_dev_dbg(&drv->pdev->dev, "close entry");
+
+	if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
+		return 0;
+
+	rc = st_unregister(&nfcwilink_proto);
+	if (rc)
+		nfc_dev_err(&drv->pdev->dev, "st_unregister failed %d", rc);
+
+	drv->st_write = NULL;
+
+	return rc;
+}
+
+static int nfcwilink_send(struct sk_buff *skb)
+{
+	struct nci_dev *ndev = (struct nci_dev *)skb->dev;
+	struct nfcwilink *drv = nci_get_drvdata(ndev);
+	struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
+	long len;
+
+	nfc_dev_dbg(&drv->pdev->dev, "send entry, len %d", skb->len);
+
+	if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	/* add the ST hdr to the start of the buffer */
+	hdr.len = cpu_to_le16(skb->len);
+	memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);
+
+	/* Insert skb to shared transport layer's transmit queue.
+	 * Freeing skb memory is taken care in shared transport layer,
+	 * so don't free skb memory here.
+	 */
+	len = drv->st_write(skb);
+	if (len < 0) {
+		kfree_skb(skb);
+		nfc_dev_err(&drv->pdev->dev, "st_write failed %ld", len);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static struct nci_ops nfcwilink_ops = {
+	.open = nfcwilink_open,
+	.close = nfcwilink_close,
+	.send = nfcwilink_send,
+};
+
+static int nfcwilink_probe(struct platform_device *pdev)
+{
+	static struct nfcwilink *drv;
+	int rc;
+	__u32 protocols;
+
+	nfc_dev_dbg(&pdev->dev, "probe entry");
+
+	drv = kzalloc(sizeof(struct nfcwilink), GFP_KERNEL);
+	if (!drv) {
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	drv->pdev = pdev;
+
+	protocols = NFC_PROTO_JEWEL_MASK
+			| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
+			| NFC_PROTO_ISO14443_MASK
+			| NFC_PROTO_NFC_DEP_MASK;
+
+	drv->ndev = nci_allocate_device(&nfcwilink_ops,
+					protocols,
+					NFCWILINK_HDR_LEN,
+					0);
+	if (!drv->ndev) {
+		nfc_dev_err(&pdev->dev, "nci_allocate_device failed");
+		rc = -ENOMEM;
+		goto free_exit;
+	}
+
+	nci_set_parent_dev(drv->ndev, &pdev->dev);
+	nci_set_drvdata(drv->ndev, drv);
+
+	rc = nci_register_device(drv->ndev);
+	if (rc < 0) {
+		nfc_dev_err(&pdev->dev, "nci_register_device failed %d", rc);
+		goto free_dev_exit;
+	}
+
+	dev_set_drvdata(&pdev->dev, drv);
+
+	goto exit;
+
+free_dev_exit:
+	nci_free_device(drv->ndev);
+
+free_exit:
+	kfree(drv);
+
+exit:
+	return rc;
+}
+
+static int nfcwilink_remove(struct platform_device *pdev)
+{
+	struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
+	struct nci_dev *ndev;
+
+	nfc_dev_dbg(&pdev->dev, "remove entry");
+
+	if (!drv)
+		return -EFAULT;
+
+	ndev = drv->ndev;
+
+	nci_unregister_device(ndev);
+	nci_free_device(ndev);
+
+	kfree(drv);
+
+	dev_set_drvdata(&pdev->dev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver nfcwilink_driver = {
+	.probe = nfcwilink_probe,
+	.remove = nfcwilink_remove,
+	.driver = {
+		.name = "nfcwilink",
+		.owner = THIS_MODULE,
+	},
+};
+
+/* ------- Module Init/Exit interfaces ------ */
+static int __init nfcwilink_init(void)
+{
+	printk(KERN_INFO "NFC Driver for TI WiLink");
+
+	return platform_driver_register(&nfcwilink_driver);
+}
+
+static void __exit nfcwilink_exit(void)
+{
+	platform_driver_unregister(&nfcwilink_driver);
+}
+
+module_init(nfcwilink_init);
+module_exit(nfcwilink_exit);
+
+/* ------ Module Info ------ */
+
+MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
+MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
+MODULE_LICENSE("GPL");
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
new file mode 100644
index 00000000..cb6204f7
--- /dev/null
+++ b/drivers/nfc/pn533.c
@@ -0,0 +1,1771 @@
+/*
+ * Copyright (C) 2011 Instituto Nokia de Tecnologia
+ *
+ * Authors:
+ *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
+ *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
+ *
+ * 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, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/nfc.h>
+#include <linux/netdevice.h>
+#include <net/nfc/nfc.h>
+
+#define VERSION "0.1"
+
+#define PN533_VENDOR_ID 0x4CC
+#define PN533_PRODUCT_ID 0x2533
+
+#define SCM_VENDOR_ID 0x4E6
+#define SCL3711_PRODUCT_ID 0x5591
+
+static const struct usb_device_id pn533_table[] = {
+	{ USB_DEVICE(PN533_VENDOR_ID, PN533_PRODUCT_ID) },
+	{ USB_DEVICE(SCM_VENDOR_ID, SCL3711_PRODUCT_ID) },
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, pn533_table);
+
+/* frame definitions */
+#define PN533_FRAME_TAIL_SIZE 2
+#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
+				PN533_FRAME_TAIL_SIZE)
+#define PN533_FRAME_ACK_SIZE (sizeof(struct pn533_frame) + 1)
+#define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
+#define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
+
+/* start of frame */
+#define PN533_SOF 0x00FF
+
+/* frame identifier: in/out/error */
+#define PN533_FRAME_IDENTIFIER(f) (f->data[0])
+#define PN533_DIR_OUT 0xD4
+#define PN533_DIR_IN 0xD5
+
+/* PN533 Commands */
+#define PN533_FRAME_CMD(f) (f->data[1])
+#define PN533_FRAME_CMD_PARAMS_PTR(f) (&f->data[2])
+#define PN533_FRAME_CMD_PARAMS_LEN(f) (f->datalen - 2)
+
+#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
+#define PN533_CMD_RF_CONFIGURATION 0x32
+#define PN533_CMD_IN_DATA_EXCHANGE 0x40
+#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
+#define PN533_CMD_IN_ATR 0x50
+#define PN533_CMD_IN_RELEASE 0x52
+#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
+
+#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
+
+/* PN533 Return codes */
+#define PN533_CMD_RET_MASK 0x3F
+#define PN533_CMD_MI_MASK 0x40
+#define PN533_CMD_RET_SUCCESS 0x00
+
+struct pn533;
+
+typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg,
+					u8 *params, int params_len);
+
+/* 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_MAX_RETRIES 0x05
+
+#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;
+
+/* 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;
+};
+
+/* Poll modulations */
+enum {
+	PN533_POLL_MOD_106KBPS_A,
+	PN533_POLL_MOD_212KBPS_FELICA,
+	PN533_POLL_MOD_424KBPS_FELICA,
+	PN533_POLL_MOD_106KBPS_JEWEL,
+	PN533_POLL_MOD_847KBPS_B,
+
+	__PN533_POLL_MOD_AFTER_LAST,
+};
+#define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
+
+struct pn533_poll_modulations {
+	struct {
+		u8 maxtg;
+		u8 brty;
+		union pn533_cmd_poll_initdata initiator_data;
+	} __packed data;
+	u8 len;
+};
+
+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_NO_SYSTEM_CODE,
+				.tsn = 0,
+			},
+		},
+		.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_NO_SYSTEM_CODE,
+				.tsn = 0,
+			},
+		 },
+		.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_CMD_IN_ATR */
+
+struct pn533_cmd_activate_param {
+	u8 tg;
+	u8 next;
+} __packed;
+
+struct pn533_cmd_activate_response {
+	u8 status;
+	u8 nfcid3t[10];
+	u8 didt;
+	u8 bst;
+	u8 brt;
+	u8 to;
+	u8 ppt;
+	/* optional */
+	u8 gt[];
+} __packed;
+
+/* PN533_CMD_IN_JUMP_FOR_DEP */
+struct pn533_cmd_jump_dep {
+	u8 active;
+	u8 baud;
+	u8 next;
+	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;
+
+struct pn533 {
+	struct usb_device *udev;
+	struct usb_interface *interface;
+	struct nfc_dev *nfc_dev;
+
+	struct urb *out_urb;
+	int out_maxlen;
+	struct pn533_frame *out_frame;
+
+	struct urb *in_urb;
+	int in_maxlen;
+	struct pn533_frame *in_frame;
+
+	struct tasklet_struct tasklet;
+	struct pn533_frame *tklt_in_frame;
+	int tklt_in_error;
+
+	pn533_cmd_complete_t cmd_complete;
+	void *cmd_complete_arg;
+	struct semaphore cmd_lock;
+	u8 cmd;
+
+	struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
+	u8 poll_mod_count;
+	u8 poll_mod_curr;
+	u32 poll_protocols;
+
+	u8 tgt_available_prots;
+	u8 tgt_active_prot;
+};
+
+struct pn533_frame {
+	u8 preamble;
+	__be16 start_frame;
+	u8 datalen;
+	u8 datalen_checksum;
+	u8 data[];
+} __packed;
+
+/* The rule: value + checksum = 0 */
+static inline u8 pn533_checksum(u8 value)
+{
+	return ~value + 1;
+}
+
+/* The rule: sum(data elements) + checksum = 0 */
+static u8 pn533_data_checksum(u8 *data, int datalen)
+{
+	u8 sum = 0;
+	int i;
+
+	for (i = 0; i < datalen; i++)
+		sum += data[i];
+
+	return pn533_checksum(sum);
+}
+
+/**
+ * pn533_tx_frame_ack - create a ack frame
+ * @frame:	The frame to be set as ack
+ *
+ * Ack is different type of standard frame. As a standard frame, it has
+ * preamble and start_frame. However the checksum of this frame must fail,
+ * i.e. datalen + datalen_checksum must NOT be zero. When the checksum test
+ * fails and datalen = 0 and datalen_checksum = 0xFF, the frame is a ack.
+ * After datalen_checksum field, the postamble is placed.
+ */
+static void pn533_tx_frame_ack(struct pn533_frame *frame)
+{
+	frame->preamble = 0;
+	frame->start_frame = cpu_to_be16(PN533_SOF);
+	frame->datalen = 0;
+	frame->datalen_checksum = 0xFF;
+	/* data[0] is used as postamble */
+	frame->data[0] = 0;
+}
+
+static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
+{
+	frame->preamble = 0;
+	frame->start_frame = cpu_to_be16(PN533_SOF);
+	PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
+	PN533_FRAME_CMD(frame) = cmd;
+	frame->datalen = 2;
+}
+
+static void pn533_tx_frame_finish(struct pn533_frame *frame)
+{
+	frame->datalen_checksum = pn533_checksum(frame->datalen);
+
+	PN533_FRAME_CHECKSUM(frame) =
+		pn533_data_checksum(frame->data, frame->datalen);
+
+	PN533_FRAME_POSTAMBLE(frame) = 0;
+}
+
+static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
+{
+	u8 checksum;
+
+	if (frame->start_frame != cpu_to_be16(PN533_SOF))
+		return false;
+
+	checksum = pn533_checksum(frame->datalen);
+	if (checksum != frame->datalen_checksum)
+		return false;
+
+	checksum = pn533_data_checksum(frame->data, frame->datalen);
+	if (checksum != PN533_FRAME_CHECKSUM(frame))
+		return false;
+
+	return true;
+}
+
+static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
+{
+	if (frame->start_frame != cpu_to_be16(PN533_SOF))
+		return false;
+
+	if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
+		return false;
+
+	return true;
+}
+
+static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
+{
+	return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
+}
+
+static void pn533_tasklet_cmd_complete(unsigned long arg)
+{
+	struct pn533 *dev = (struct pn533 *) arg;
+	struct pn533_frame *in_frame = dev->tklt_in_frame;
+	int rc;
+
+	if (dev->tklt_in_error)
+		rc = dev->cmd_complete(dev, dev->cmd_complete_arg, NULL,
+							dev->tklt_in_error);
+	else
+		rc = dev->cmd_complete(dev, dev->cmd_complete_arg,
+					PN533_FRAME_CMD_PARAMS_PTR(in_frame),
+					PN533_FRAME_CMD_PARAMS_LEN(in_frame));
+
+	if (rc != -EINPROGRESS)
+		up(&dev->cmd_lock);
+}
+
+static void pn533_recv_response(struct urb *urb)
+{
+	struct pn533 *dev = urb->context;
+	struct pn533_frame *in_frame;
+
+	dev->tklt_in_frame = NULL;
+
+	switch (urb->status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
+						" status: %d", urb->status);
+		dev->tklt_in_error = urb->status;
+		goto sched_tasklet;
+	default:
+		nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:"
+							" %d", urb->status);
+		dev->tklt_in_error = urb->status;
+		goto sched_tasklet;
+	}
+
+	in_frame = dev->in_urb->transfer_buffer;
+
+	if (!pn533_rx_frame_is_valid(in_frame)) {
+		nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
+		dev->tklt_in_error = -EIO;
+		goto sched_tasklet;
+	}
+
+	if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
+		nfc_dev_err(&dev->interface->dev, "The received frame is not "
+						"response to the last command");
+		dev->tklt_in_error = -EIO;
+		goto sched_tasklet;
+	}
+
+	nfc_dev_dbg(&dev->interface->dev, "Received a valid frame");
+	dev->tklt_in_error = 0;
+	dev->tklt_in_frame = in_frame;
+
+sched_tasklet:
+	tasklet_schedule(&dev->tasklet);
+}
+
+static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
+{
+	dev->in_urb->complete = pn533_recv_response;
+
+	return usb_submit_urb(dev->in_urb, flags);
+}
+
+static void pn533_recv_ack(struct urb *urb)
+{
+	struct pn533 *dev = urb->context;
+	struct pn533_frame *in_frame;
+	int rc;
+
+	switch (urb->status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
+						" status: %d", urb->status);
+		dev->tklt_in_error = urb->status;
+		goto sched_tasklet;
+	default:
+		nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:"
+							" %d", urb->status);
+		dev->tklt_in_error = urb->status;
+		goto sched_tasklet;
+	}
+
+	in_frame = dev->in_urb->transfer_buffer;
+
+	if (!pn533_rx_frame_is_ack(in_frame)) {
+		nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
+		dev->tklt_in_error = -EIO;
+		goto sched_tasklet;
+	}
+
+	nfc_dev_dbg(&dev->interface->dev, "Received a valid ack");
+
+	rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
+	if (rc) {
+		nfc_dev_err(&dev->interface->dev, "usb_submit_urb failed with"
+							" result %d", rc);
+		dev->tklt_in_error = rc;
+		goto sched_tasklet;
+	}
+
+	return;
+
+sched_tasklet:
+	dev->tklt_in_frame = NULL;
+	tasklet_schedule(&dev->tasklet);
+}
+
+static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
+{
+	dev->in_urb->complete = pn533_recv_ack;
+
+	return usb_submit_urb(dev->in_urb, flags);
+}
+
+static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
+{
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	pn533_tx_frame_ack(dev->out_frame);
+
+	dev->out_urb->transfer_buffer = dev->out_frame;
+	dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE;
+	rc = usb_submit_urb(dev->out_urb, flags);
+
+	return rc;
+}
+
+static int __pn533_send_cmd_frame_async(struct pn533 *dev,
+					struct pn533_frame *out_frame,
+					struct pn533_frame *in_frame,
+					int in_frame_len,
+					pn533_cmd_complete_t cmd_complete,
+					void *arg, gfp_t flags)
+{
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x",
+						PN533_FRAME_CMD(out_frame));
+
+	dev->cmd = PN533_FRAME_CMD(out_frame);
+	dev->cmd_complete = cmd_complete;
+	dev->cmd_complete_arg = arg;
+
+	dev->out_urb->transfer_buffer = out_frame;
+	dev->out_urb->transfer_buffer_length =
+				PN533_FRAME_SIZE(out_frame);
+
+	dev->in_urb->transfer_buffer = in_frame;
+	dev->in_urb->transfer_buffer_length = in_frame_len;
+
+	rc = usb_submit_urb(dev->out_urb, flags);
+	if (rc)
+		return rc;
+
+	rc = pn533_submit_urb_for_ack(dev, flags);
+	if (rc)
+		goto error;
+
+	return 0;
+
+error:
+	usb_unlink_urb(dev->out_urb);
+	return rc;
+}
+
+static int pn533_send_cmd_frame_async(struct pn533 *dev,
+					struct pn533_frame *out_frame,
+					struct pn533_frame *in_frame,
+					int in_frame_len,
+					pn533_cmd_complete_t cmd_complete,
+					void *arg, gfp_t flags)
+{
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	if (down_trylock(&dev->cmd_lock))
+		return -EBUSY;
+
+	rc = __pn533_send_cmd_frame_async(dev, out_frame, in_frame,
+					in_frame_len, cmd_complete, arg, flags);
+	if (rc)
+		goto error;
+
+	return 0;
+error:
+	up(&dev->cmd_lock);
+	return rc;
+}
+
+struct pn533_sync_cmd_response {
+	int rc;
+	struct completion done;
+};
+
+static int pn533_sync_cmd_complete(struct pn533 *dev, void *_arg,
+					u8 *params, int params_len)
+{
+	struct pn533_sync_cmd_response *arg = _arg;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	arg->rc = 0;
+
+	if (params_len < 0) /* error */
+		arg->rc = params_len;
+
+	complete(&arg->done);
+
+	return 0;
+}
+
+static int pn533_send_cmd_frame_sync(struct pn533 *dev,
+						struct pn533_frame *out_frame,
+						struct pn533_frame *in_frame,
+						int in_frame_len)
+{
+	int rc;
+	struct pn533_sync_cmd_response arg;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	init_completion(&arg.done);
+
+	rc = pn533_send_cmd_frame_async(dev, out_frame, in_frame, in_frame_len,
+				pn533_sync_cmd_complete, &arg, GFP_KERNEL);
+	if (rc)
+		return rc;
+
+	wait_for_completion(&arg.done);
+
+	return arg.rc;
+}
+
+static void pn533_send_complete(struct urb *urb)
+{
+	struct pn533 *dev = urb->context;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	switch (urb->status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
+						" status: %d", urb->status);
+		break;
+	default:
+		nfc_dev_dbg(&dev->interface->dev, "Nonzero urb status received:"
+							" %d", urb->status);
+	}
+}
+
+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 lenght 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[8];
+	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;
+
+	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_MASK;
+
+	return 0;
+}
+
+struct pn533_poll_response {
+	u8 nbtg;
+	u8 tg;
+	u8 target_data[];
+} __packed;
+
+static int pn533_target_found(struct pn533 *dev,
+			struct pn533_poll_response *resp, int resp_len)
+{
+	int target_data_len;
+	struct nfc_target nfc_tgt;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
+							dev->poll_mod_curr);
+
+	if (resp->tg != 1)
+		return -EPROTO;
+
+	memset(&nfc_tgt, 0, sizeof(struct nfc_target));
+
+	target_data_len = resp_len - sizeof(struct pn533_poll_response);
+
+	switch (dev->poll_mod_curr) {
+	case PN533_POLL_MOD_106KBPS_A:
+		rc = pn533_target_found_type_a(&nfc_tgt, resp->target_data,
+							target_data_len);
+		break;
+	case PN533_POLL_MOD_212KBPS_FELICA:
+	case PN533_POLL_MOD_424KBPS_FELICA:
+		rc = pn533_target_found_felica(&nfc_tgt, resp->target_data,
+							target_data_len);
+		break;
+	case PN533_POLL_MOD_106KBPS_JEWEL:
+		rc = pn533_target_found_jewel(&nfc_tgt, resp->target_data,
+							target_data_len);
+		break;
+	case PN533_POLL_MOD_847KBPS_B:
+		rc = pn533_target_found_type_b(&nfc_tgt, resp->target_data,
+							target_data_len);
+		break;
+	default:
+		nfc_dev_err(&dev->interface->dev, "Unknown current poll"
+								" modulation");
+		return -EPROTO;
+	}
+
+	if (rc)
+		return rc;
+
+	if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
+		nfc_dev_dbg(&dev->interface->dev, "The target found does not"
+						" have the desired protocol");
+		return -EAGAIN;
+	}
+
+	nfc_dev_dbg(&dev->interface->dev, "Target found - supported protocols: "
+					"0x%x", nfc_tgt.supported_protocols);
+
+	dev->tgt_available_prots = nfc_tgt.supported_protocols;
+
+	nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
+
+	return 0;
+}
+
+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 protocols)
+{
+	pn533_poll_reset_mod_list(dev);
+
+	if (protocols & NFC_PROTO_MIFARE_MASK
+					|| protocols & NFC_PROTO_ISO14443_MASK
+					|| protocols & NFC_PROTO_NFC_DEP_MASK)
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
+
+	if (protocols & NFC_PROTO_FELICA_MASK
+					|| 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 (protocols & NFC_PROTO_JEWEL_MASK)
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
+
+	if (protocols & NFC_PROTO_ISO14443_MASK)
+		pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
+}
+
+static void pn533_start_poll_frame(struct pn533_frame *frame,
+					struct pn533_poll_modulations *mod)
+{
+
+	pn533_tx_frame_init(frame, PN533_CMD_IN_LIST_PASSIVE_TARGET);
+
+	memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), &mod->data, mod->len);
+	frame->datalen += mod->len;
+
+	pn533_tx_frame_finish(frame);
+}
+
+static int pn533_start_poll_complete(struct pn533 *dev, void *arg,
+						u8 *params, int params_len)
+{
+	struct pn533_poll_response *resp;
+	struct pn533_poll_modulations *next_mod;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	if (params_len == -ENOENT) {
+		nfc_dev_dbg(&dev->interface->dev, "Polling operation has been"
+								" stopped");
+		goto stop_poll;
+	}
+
+	if (params_len < 0) {
+		nfc_dev_err(&dev->interface->dev, "Error %d when running poll",
+								params_len);
+		goto stop_poll;
+	}
+
+	resp = (struct pn533_poll_response *) params;
+	if (resp->nbtg) {
+		rc = pn533_target_found(dev, resp, params_len);
+
+		/* We must stop the poll after a valid target found */
+		if (rc == 0)
+			goto stop_poll;
+
+		if (rc != -EAGAIN)
+			nfc_dev_err(&dev->interface->dev, "The target found is"
+					" not valid - continuing to poll");
+	}
+
+	dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
+
+	next_mod = dev->poll_mod_active[dev->poll_mod_curr];
+
+	nfc_dev_dbg(&dev->interface->dev, "Polling next modulation (0x%x)",
+							dev->poll_mod_curr);
+
+	pn533_start_poll_frame(dev->out_frame, next_mod);
+
+	/* Don't need to down the semaphore again */
+	rc = __pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
+				dev->in_maxlen, pn533_start_poll_complete,
+				NULL, GFP_ATOMIC);
+
+	if (rc == -EPERM) {
+		nfc_dev_dbg(&dev->interface->dev, "Cannot poll next modulation"
+					" because poll has been stopped");
+		goto stop_poll;
+	}
+
+	if (rc) {
+		nfc_dev_err(&dev->interface->dev, "Error %d when trying to poll"
+							" next modulation", rc);
+		goto stop_poll;
+	}
+
+	/* Inform caller function to do not up the semaphore */
+	return -EINPROGRESS;
+
+stop_poll:
+	pn533_poll_reset_mod_list(dev);
+	dev->poll_protocols = 0;
+	return 0;
+}
+
+static int pn533_start_poll(struct nfc_dev *nfc_dev, u32 protocols)
+{
+	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+	struct pn533_poll_modulations *start_mod;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s - protocols=0x%x", __func__,
+								protocols);
+
+	if (dev->poll_mod_count) {
+		nfc_dev_err(&dev->interface->dev, "Polling operation already"
+								" active");
+		return -EBUSY;
+	}
+
+	if (dev->tgt_active_prot) {
+		nfc_dev_err(&dev->interface->dev, "Cannot poll with a target"
+							" already activated");
+		return -EBUSY;
+	}
+
+	pn533_poll_create_mod_list(dev, protocols);
+
+	if (!dev->poll_mod_count) {
+		nfc_dev_err(&dev->interface->dev, "No valid protocols"
+								" specified");
+		rc = -EINVAL;
+		goto error;
+	}
+
+	nfc_dev_dbg(&dev->interface->dev, "It will poll %d modulations types",
+							dev->poll_mod_count);
+
+	dev->poll_mod_curr = 0;
+	start_mod = dev->poll_mod_active[dev->poll_mod_curr];
+
+	pn533_start_poll_frame(dev->out_frame, start_mod);
+
+	rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
+				dev->in_maxlen,	pn533_start_poll_complete,
+				NULL, GFP_KERNEL);
+
+	if (rc) {
+		nfc_dev_err(&dev->interface->dev, "Error %d when trying to"
+							" start poll", rc);
+		goto error;
+	}
+
+	dev->poll_protocols = protocols;
+
+	return 0;
+
+error:
+	pn533_poll_reset_mod_list(dev);
+	return rc;
+}
+
+static void pn533_stop_poll(struct nfc_dev *nfc_dev)
+{
+	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	if (!dev->poll_mod_count) {
+		nfc_dev_dbg(&dev->interface->dev, "Polling operation was not"
+								" running");
+		return;
+	}
+
+	/* An ack will cancel the last issued command (poll) */
+	pn533_send_ack(dev, GFP_KERNEL);
+
+	/* prevent pn533_start_poll_complete to issue a new poll meanwhile */
+	usb_kill_urb(dev->in_urb);
+}
+
+static int pn533_activate_target_nfcdep(struct pn533 *dev)
+{
+	struct pn533_cmd_activate_param param;
+	struct pn533_cmd_activate_response *resp;
+	u16 gt_len;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_ATR);
+
+	param.tg = 1;
+	param.next = 0;
+	memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), &param,
+				sizeof(struct pn533_cmd_activate_param));
+	dev->out_frame->datalen += sizeof(struct pn533_cmd_activate_param);
+
+	pn533_tx_frame_finish(dev->out_frame);
+
+	rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
+								dev->in_maxlen);
+	if (rc)
+		return rc;
+
+	resp = (struct pn533_cmd_activate_response *)
+				PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame);
+	rc = resp->status & PN533_CMD_RET_MASK;
+	if (rc != PN533_CMD_RET_SUCCESS)
+		return -EIO;
+
+	/* ATR_RES general bytes are located at offset 16 */
+	gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 16;
+	rc = nfc_set_remote_general_bytes(dev->nfc_dev, resp->gt, gt_len);
+
+	return rc;
+}
+
+static int pn533_activate_target(struct nfc_dev *nfc_dev, u32 target_idx,
+								u32 protocol)
+{
+	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
+								protocol);
+
+	if (dev->poll_mod_count) {
+		nfc_dev_err(&dev->interface->dev, "Cannot activate while"
+								" polling");
+		return -EBUSY;
+	}
+
+	if (dev->tgt_active_prot) {
+		nfc_dev_err(&dev->interface->dev, "There is already an active"
+								" target");
+		return -EBUSY;
+	}
+
+	if (!dev->tgt_available_prots) {
+		nfc_dev_err(&dev->interface->dev, "There is no available target"
+								" to activate");
+		return -EINVAL;
+	}
+
+	if (!(dev->tgt_available_prots & (1 << protocol))) {
+		nfc_dev_err(&dev->interface->dev, "The target does not support"
+					" the requested protocol %u", protocol);
+		return -EINVAL;
+	}
+
+	if (protocol == NFC_PROTO_NFC_DEP) {
+		rc = pn533_activate_target_nfcdep(dev);
+		if (rc) {
+			nfc_dev_err(&dev->interface->dev, "Error %d when"
+						" activating target with"
+						" NFC_DEP protocol", rc);
+			return rc;
+		}
+	}
+
+	dev->tgt_active_prot = protocol;
+	dev->tgt_available_prots = 0;
+
+	return 0;
+}
+
+static void pn533_deactivate_target(struct nfc_dev *nfc_dev, u32 target_idx)
+{
+	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+	u8 tg;
+	u8 status;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	if (!dev->tgt_active_prot) {
+		nfc_dev_err(&dev->interface->dev, "There is no active target");
+		return;
+	}
+
+	dev->tgt_active_prot = 0;
+
+	pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_RELEASE);
+
+	tg = 1;
+	memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), &tg, sizeof(u8));
+	dev->out_frame->datalen += sizeof(u8);
+
+	pn533_tx_frame_finish(dev->out_frame);
+
+	rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
+								dev->in_maxlen);
+	if (rc) {
+		nfc_dev_err(&dev->interface->dev, "Error when sending release"
+						" command to the controller");
+		return;
+	}
+
+	status = PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame)[0];
+	rc = status & PN533_CMD_RET_MASK;
+	if (rc != PN533_CMD_RET_SUCCESS)
+		nfc_dev_err(&dev->interface->dev, "Error 0x%x when releasing"
+							" the target", rc);
+
+	return;
+}
+
+
+static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
+						u8 *params, int params_len)
+{
+	struct pn533_cmd_jump_dep *cmd;
+	struct pn533_cmd_jump_dep_response *resp;
+	struct nfc_target nfc_target;
+	u8 target_gt_len;
+	int rc;
+
+	if (params_len == -ENOENT) {
+		nfc_dev_dbg(&dev->interface->dev, "");
+		return 0;
+	}
+
+	if (params_len < 0) {
+		nfc_dev_err(&dev->interface->dev,
+				"Error %d when bringing DEP link up",
+								params_len);
+		return 0;
+	}
+
+	if (dev->tgt_available_prots &&
+	    !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
+		nfc_dev_err(&dev->interface->dev,
+			"The target does not support DEP");
+		return -EINVAL;
+	}
+
+	resp = (struct pn533_cmd_jump_dep_response *) params;
+	cmd = (struct pn533_cmd_jump_dep *) arg;
+	rc = resp->status & PN533_CMD_RET_MASK;
+	if (rc != PN533_CMD_RET_SUCCESS) {
+		nfc_dev_err(&dev->interface->dev,
+				"Bringing DEP link up failed %d", rc);
+		return 0;
+	}
+
+	if (!dev->tgt_available_prots) {
+		nfc_dev_dbg(&dev->interface->dev, "Creating new target");
+
+		nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
+		nfc_target.nfcid1_len = 10;
+		memcpy(nfc_target.nfcid1, resp->nfcid3t, nfc_target.nfcid1_len);
+		rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
+		if (rc)
+			return 0;
+
+		dev->tgt_available_prots = 0;
+	}
+
+	dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
+
+	/* ATR_RES general bytes are located at offset 17 */
+	target_gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 17;
+	rc = nfc_set_remote_general_bytes(dev->nfc_dev,
+						resp->gt, target_gt_len);
+	if (rc == 0)
+		rc = nfc_dep_link_is_up(dev->nfc_dev,
+						dev->nfc_dev->targets[0].idx,
+						!cmd->active, NFC_RF_INITIATOR);
+
+	return 0;
+}
+
+static int pn533_dep_link_up(struct nfc_dev *nfc_dev, int target_idx,
+			     u8 comm_mode, u8* gb, size_t gb_len)
+{
+	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+	struct pn533_cmd_jump_dep *cmd;
+	u8 cmd_len;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	if (dev->poll_mod_count) {
+		nfc_dev_err(&dev->interface->dev,
+				"Cannot bring the DEP link up while polling");
+		return -EBUSY;
+	}
+
+	if (dev->tgt_active_prot) {
+		nfc_dev_err(&dev->interface->dev,
+				"There is already an active target");
+		return -EBUSY;
+	}
+
+	cmd_len = sizeof(struct pn533_cmd_jump_dep) + gb_len;
+	cmd = kzalloc(cmd_len, GFP_KERNEL);
+	if (cmd == NULL)
+		return -ENOMEM;
+
+	pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_JUMP_FOR_DEP);
+
+	cmd->active = !comm_mode;
+	cmd->baud = 0;
+	if (gb != NULL && gb_len > 0) {
+		cmd->next = 4; /* We have some Gi */
+		memcpy(cmd->gt, gb, gb_len);
+	} else {
+		cmd->next = 0;
+	}
+
+	memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), cmd, cmd_len);
+	dev->out_frame->datalen += cmd_len;
+
+	pn533_tx_frame_finish(dev->out_frame);
+
+	rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
+				dev->in_maxlen,	pn533_in_dep_link_up_complete,
+				cmd, GFP_KERNEL);
+	if (rc)
+		goto out;
+
+
+out:
+	kfree(cmd);
+
+	return rc;
+}
+
+static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
+{
+	pn533_deactivate_target(nfc_dev, 0);
+
+	return 0;
+}
+
+#define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3)
+#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
+
+static int pn533_data_exchange_tx_frame(struct pn533 *dev, struct sk_buff *skb)
+{
+	int payload_len = skb->len;
+	struct pn533_frame *out_frame;
+	u8 tg;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s - Sending %d bytes", __func__,
+								payload_len);
+
+	if (payload_len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
+		/* TODO: Implement support to multi-part data exchange */
+		nfc_dev_err(&dev->interface->dev, "Data length greater than the"
+						" max allowed: %d",
+						PN533_CMD_DATAEXCH_DATA_MAXLEN);
+		return -ENOSYS;
+	}
+
+	skb_push(skb, PN533_CMD_DATAEXCH_HEAD_LEN);
+	out_frame = (struct pn533_frame *) skb->data;
+
+	pn533_tx_frame_init(out_frame, PN533_CMD_IN_DATA_EXCHANGE);
+
+	tg = 1;
+	memcpy(PN533_FRAME_CMD_PARAMS_PTR(out_frame), &tg, sizeof(u8));
+	out_frame->datalen += sizeof(u8);
+
+	/* The data is already in the out_frame, just update the datalen */
+	out_frame->datalen += payload_len;
+
+	pn533_tx_frame_finish(out_frame);
+	skb_put(skb, PN533_FRAME_TAIL_SIZE);
+
+	return 0;
+}
+
+struct pn533_data_exchange_arg {
+	struct sk_buff *skb_resp;
+	struct sk_buff *skb_out;
+	data_exchange_cb_t cb;
+	void *cb_context;
+};
+
+static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
+						u8 *params, int params_len)
+{
+	struct pn533_data_exchange_arg *arg = _arg;
+	struct sk_buff *skb_resp = arg->skb_resp;
+	struct pn533_frame *in_frame = (struct pn533_frame *) skb_resp->data;
+	int err = 0;
+	u8 status;
+	u8 cmd_ret;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	dev_kfree_skb_irq(arg->skb_out);
+
+	if (params_len < 0) { /* error */
+		err = params_len;
+		goto error;
+	}
+
+	skb_put(skb_resp, PN533_FRAME_SIZE(in_frame));
+
+	status = params[0];
+
+	cmd_ret = status & PN533_CMD_RET_MASK;
+	if (cmd_ret != PN533_CMD_RET_SUCCESS) {
+		nfc_dev_err(&dev->interface->dev, "PN533 reported error %d when"
+						" exchanging data", cmd_ret);
+		err = -EIO;
+		goto error;
+	}
+
+	if (status & PN533_CMD_MI_MASK) {
+		/* TODO: Implement support to multi-part data exchange */
+		nfc_dev_err(&dev->interface->dev, "Multi-part message not yet"
+								" supported");
+		/* Prevent the other messages from controller */
+		pn533_send_ack(dev, GFP_ATOMIC);
+		err = -ENOSYS;
+		goto error;
+	}
+
+	skb_pull(skb_resp, PN533_CMD_DATAEXCH_HEAD_LEN);
+	skb_trim(skb_resp, skb_resp->len - PN533_FRAME_TAIL_SIZE);
+
+	arg->cb(arg->cb_context, skb_resp, 0);
+	kfree(arg);
+	return 0;
+
+error:
+	dev_kfree_skb_irq(skb_resp);
+	arg->cb(arg->cb_context, NULL, err);
+	kfree(arg);
+	return 0;
+}
+
+static int pn533_data_exchange(struct nfc_dev *nfc_dev, u32 target_idx,
+						struct sk_buff *skb,
+						data_exchange_cb_t cb,
+						void *cb_context)
+{
+	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
+	struct pn533_frame *out_frame, *in_frame;
+	struct pn533_data_exchange_arg *arg;
+	struct sk_buff *skb_resp;
+	int skb_resp_len;
+	int rc;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	if (!dev->tgt_active_prot) {
+		nfc_dev_err(&dev->interface->dev, "Cannot exchange data if"
+						" there is no active target");
+		rc = -EINVAL;
+		goto error;
+	}
+
+	rc = pn533_data_exchange_tx_frame(dev, skb);
+	if (rc)
+		goto error;
+
+	skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN +
+			PN533_CMD_DATAEXCH_DATA_MAXLEN +
+			PN533_FRAME_TAIL_SIZE;
+
+	skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL);
+	if (!skb_resp) {
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	in_frame = (struct pn533_frame *) skb_resp->data;
+	out_frame = (struct pn533_frame *) skb->data;
+
+	arg = kmalloc(sizeof(struct pn533_data_exchange_arg), GFP_KERNEL);
+	if (!arg) {
+		rc = -ENOMEM;
+		goto free_skb_resp;
+	}
+
+	arg->skb_resp = skb_resp;
+	arg->skb_out = skb;
+	arg->cb = cb;
+	arg->cb_context = cb_context;
+
+	rc = pn533_send_cmd_frame_async(dev, out_frame, in_frame, skb_resp_len,
+					pn533_data_exchange_complete, arg,
+					GFP_KERNEL);
+	if (rc) {
+		nfc_dev_err(&dev->interface->dev, "Error %d when trying to"
+						" perform data_exchange", rc);
+		goto free_arg;
+	}
+
+	return 0;
+
+free_arg:
+	kfree(arg);
+free_skb_resp:
+	kfree_skb(skb_resp);
+error:
+	kfree_skb(skb);
+	return rc;
+}
+
+static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
+								u8 cfgdata_len)
+{
+	int rc;
+	u8 *params;
+
+	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+	pn533_tx_frame_init(dev->out_frame, PN533_CMD_RF_CONFIGURATION);
+
+	params = PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame);
+	params[0] = cfgitem;
+	memcpy(&params[1], cfgdata, cfgdata_len);
+	dev->out_frame->datalen += (1 + cfgdata_len);
+
+	pn533_tx_frame_finish(dev->out_frame);
+
+	rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
+								dev->in_maxlen);
+
+	return rc;
+}
+
+struct nfc_ops pn533_nfc_ops = {
+	.dev_up = NULL,
+	.dev_down = NULL,
+	.dep_link_up = pn533_dep_link_up,
+	.dep_link_down = pn533_dep_link_down,
+	.start_poll = pn533_start_poll,
+	.stop_poll = pn533_stop_poll,
+	.activate_target = pn533_activate_target,
+	.deactivate_target = pn533_deactivate_target,
+	.data_exchange = pn533_data_exchange,
+};
+
+static int pn533_probe(struct usb_interface *interface,
+			const struct usb_device_id *id)
+{
+	struct pn533_fw_version *fw_ver;
+	struct pn533 *dev;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	struct pn533_config_max_retries max_retries;
+	int in_endpoint = 0;
+	int out_endpoint = 0;
+	int rc = -ENOMEM;
+	int i;
+	u32 protocols;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->udev = usb_get_dev(interface_to_usbdev(interface));
+	dev->interface = interface;
+	sema_init(&dev->cmd_lock, 1);
+
+	iface_desc = interface->cur_altsetting;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint)) {
+			dev->in_maxlen = le16_to_cpu(endpoint->wMaxPacketSize);
+			in_endpoint = endpoint->bEndpointAddress;
+		}
+
+		if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint)) {
+			dev->out_maxlen =
+				le16_to_cpu(endpoint->wMaxPacketSize);
+			out_endpoint = endpoint->bEndpointAddress;
+		}
+	}
+
+	if (!in_endpoint || !out_endpoint) {
+		nfc_dev_err(&interface->dev, "Could not find bulk-in or"
+							" bulk-out endpoint");
+		rc = -ENODEV;
+		goto error;
+	}
+
+	dev->in_frame = kmalloc(dev->in_maxlen, GFP_KERNEL);
+	dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
+	dev->out_frame = kmalloc(dev->out_maxlen, GFP_KERNEL);
+	dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
+
+	if (!dev->in_frame || !dev->out_frame ||
+		!dev->in_urb || !dev->out_urb)
+		goto error;
+
+	usb_fill_bulk_urb(dev->in_urb, dev->udev,
+			usb_rcvbulkpipe(dev->udev, in_endpoint),
+			NULL, 0, NULL, dev);
+	usb_fill_bulk_urb(dev->out_urb, dev->udev,
+			usb_sndbulkpipe(dev->udev, out_endpoint),
+			NULL, 0,
+			pn533_send_complete, dev);
+
+	tasklet_init(&dev->tasklet, pn533_tasklet_cmd_complete, (ulong)dev);
+
+	usb_set_intfdata(interface, dev);
+
+	pn533_tx_frame_init(dev->out_frame, PN533_CMD_GET_FIRMWARE_VERSION);
+	pn533_tx_frame_finish(dev->out_frame);
+
+	rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
+								dev->in_maxlen);
+	if (rc)
+		goto kill_tasklet;
+
+	fw_ver = (struct pn533_fw_version *)
+				PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame);
+	nfc_dev_info(&dev->interface->dev, "NXP PN533 firmware ver %d.%d now"
+					" attached", fw_ver->ver, fw_ver->rev);
+
+	protocols = NFC_PROTO_JEWEL_MASK
+			| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
+			| NFC_PROTO_ISO14443_MASK
+			| NFC_PROTO_NFC_DEP_MASK;
+
+	dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
+					   PN533_CMD_DATAEXCH_HEAD_LEN,
+					   PN533_FRAME_TAIL_SIZE);
+	if (!dev->nfc_dev)
+		goto kill_tasklet;
+
+	nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
+	nfc_set_drvdata(dev->nfc_dev, dev);
+
+	rc = nfc_register_device(dev->nfc_dev);
+	if (rc)
+		goto free_nfc_dev;
+
+	max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
+	max_retries.mx_rty_psl = 2;
+	max_retries.mx_rty_passive_act = PN533_CONFIG_MAX_RETRIES_NO_RETRY;
+
+	rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
+				(u8 *) &max_retries, sizeof(max_retries));
+
+	if (rc) {
+		nfc_dev_err(&dev->interface->dev, "Error on setting MAX_RETRIES"
+								" config");
+		goto free_nfc_dev;
+	}
+
+	return 0;
+
+free_nfc_dev:
+	nfc_free_device(dev->nfc_dev);
+kill_tasklet:
+	tasklet_kill(&dev->tasklet);
+error:
+	kfree(dev->in_frame);
+	usb_free_urb(dev->in_urb);
+	kfree(dev->out_frame);
+	usb_free_urb(dev->out_urb);
+	kfree(dev);
+	return rc;
+}
+
+static void pn533_disconnect(struct usb_interface *interface)
+{
+	struct pn533 *dev;
+
+	dev = usb_get_intfdata(interface);
+	usb_set_intfdata(interface, NULL);
+
+	nfc_unregister_device(dev->nfc_dev);
+	nfc_free_device(dev->nfc_dev);
+
+	usb_kill_urb(dev->in_urb);
+	usb_kill_urb(dev->out_urb);
+
+	tasklet_kill(&dev->tasklet);
+
+	kfree(dev->in_frame);
+	usb_free_urb(dev->in_urb);
+	kfree(dev->out_frame);
+	usb_free_urb(dev->out_urb);
+	kfree(dev);
+
+	nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
+}
+
+static struct usb_driver pn533_driver = {
+	.name =		"pn533",
+	.probe =	pn533_probe,
+	.disconnect =	pn533_disconnect,
+	.id_table =	pn533_table,
+};
+
+module_usb_driver(pn533_driver);
+
+MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>,"
+			" Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
+MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
diff --git a/drivers/nfc/pn544.c b/drivers/nfc/pn544.c
new file mode 100644
index 00000000..724f65d8
--- /dev/null
+++ b/drivers/nfc/pn544.c
@@ -0,0 +1,893 @@
+/*
+ * Driver for the PN544 NFC chip.
+ *
+ * Copyright (C) Nokia Corporation
+ *
+ * Author: Jari Vanhala <ext-jari.vanhala@nokia.com>
+ * Contact: Matti Aaltonen <matti.j.aaltonen@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/completion.h>
+#include <linux/crc-ccitt.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/nfc/pn544.h>
+#include <linux/poll.h>
+#include <linux/regulator/consumer.h>
+#include <linux/serial_core.h> /* for TCGETS */
+#include <linux/slab.h>
+
+#define DRIVER_CARD	"PN544 NFC"
+#define DRIVER_DESC	"NFC driver for PN544"
+
+static struct i2c_device_id pn544_id_table[] = {
+	{ PN544_DRIVER_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pn544_id_table);
+
+#define HCI_MODE	0
+#define FW_MODE		1
+
+enum pn544_state {
+	PN544_ST_COLD,
+	PN544_ST_FW_READY,
+	PN544_ST_READY,
+};
+
+enum pn544_irq {
+	PN544_NONE,
+	PN544_INT,
+};
+
+struct pn544_info {
+	struct miscdevice miscdev;
+	struct i2c_client *i2c_dev;
+	struct regulator_bulk_data regs[3];
+
+	enum pn544_state state;
+	wait_queue_head_t read_wait;
+	loff_t read_offset;
+	enum pn544_irq read_irq;
+	struct mutex read_mutex; /* Serialize read_irq access */
+	struct mutex mutex; /* Serialize info struct access */
+	u8 *buf;
+	size_t buflen;
+};
+
+static const char reg_vdd_io[]	= "Vdd_IO";
+static const char reg_vbat[]	= "VBat";
+static const char reg_vsim[]	= "VSim";
+
+/* sysfs interface */
+static ssize_t pn544_test(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct pn544_info *info = dev_get_drvdata(dev);
+	struct i2c_client *client = info->i2c_dev;
+	struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", pdata->test());
+}
+
+static int pn544_enable(struct pn544_info *info, int mode)
+{
+	struct pn544_nfc_platform_data *pdata;
+	struct i2c_client *client = info->i2c_dev;
+
+	int r;
+
+	r = regulator_bulk_enable(ARRAY_SIZE(info->regs), info->regs);
+	if (r < 0)
+		return r;
+
+	pdata = client->dev.platform_data;
+	info->read_irq = PN544_NONE;
+	if (pdata->enable)
+		pdata->enable(mode);
+
+	if (mode) {
+		info->state = PN544_ST_FW_READY;
+		dev_dbg(&client->dev, "now in FW-mode\n");
+	} else {
+		info->state = PN544_ST_READY;
+		dev_dbg(&client->dev, "now in HCI-mode\n");
+	}
+
+	usleep_range(10000, 15000);
+
+	return 0;
+}
+
+static void pn544_disable(struct pn544_info *info)
+{
+	struct pn544_nfc_platform_data *pdata;
+	struct i2c_client *client = info->i2c_dev;
+
+	pdata = client->dev.platform_data;
+	if (pdata->disable)
+		pdata->disable();
+
+	info->state = PN544_ST_COLD;
+
+	dev_dbg(&client->dev, "Now in OFF-mode\n");
+
+	msleep(PN544_RESETVEN_TIME);
+
+	info->read_irq = PN544_NONE;
+	regulator_bulk_disable(ARRAY_SIZE(info->regs), info->regs);
+}
+
+static int check_crc(u8 *buf, int buflen)
+{
+	u8 len;
+	u16 crc;
+
+	len = buf[0] + 1;
+	if (len < 4 || len != buflen || len > PN544_MSG_MAX_SIZE) {
+		pr_err(PN544_DRIVER_NAME
+		       ": CRC; corrupt packet len %u (%d)\n", len, buflen);
+		print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
+			       16, 2, buf, buflen, false);
+		return -EPERM;
+	}
+	crc = crc_ccitt(0xffff, buf, len - 2);
+	crc = ~crc;
+
+	if (buf[len-2] != (crc & 0xff) || buf[len-1] != (crc >> 8)) {
+		pr_err(PN544_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
+		       crc, buf[len-1], buf[len-2]);
+
+		print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
+			       16, 2, buf, buflen, false);
+		return -EPERM;
+	}
+	return 0;
+}
+
+static int pn544_i2c_write(struct i2c_client *client, u8 *buf, int len)
+{
+	int r;
+
+	if (len < 4 || len != (buf[0] + 1)) {
+		dev_err(&client->dev, "%s: Illegal message length: %d\n",
+			__func__, len);
+		return -EINVAL;
+	}
+
+	if (check_crc(buf, len))
+		return -EINVAL;
+
+	usleep_range(3000, 6000);
+
+	r = i2c_master_send(client, buf, len);
+	dev_dbg(&client->dev, "send: %d\n", r);
+
+	if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+		usleep_range(6000, 10000);
+		r = i2c_master_send(client, buf, len);
+		dev_dbg(&client->dev, "send2: %d\n", r);
+	}
+
+	if (r != len)
+		return -EREMOTEIO;
+
+	return r;
+}
+
+static int pn544_i2c_read(struct i2c_client *client, u8 *buf, int buflen)
+{
+	int r;
+	u8 len;
+
+	/*
+	 * You could read a packet in one go, but then you'd need to read
+	 * max size and rest would be 0xff fill, so we do split reads.
+	 */
+	r = i2c_master_recv(client, &len, 1);
+	dev_dbg(&client->dev, "recv1: %d\n", r);
+
+	if (r != 1)
+		return -EREMOTEIO;
+
+	if (len < PN544_LLC_HCI_OVERHEAD)
+		len = PN544_LLC_HCI_OVERHEAD;
+	else if (len > (PN544_MSG_MAX_SIZE - 1))
+		len = PN544_MSG_MAX_SIZE - 1;
+
+	if (1 + len > buflen) /* len+(data+crc16) */
+		return -EMSGSIZE;
+
+	buf[0] = len;
+
+	r = i2c_master_recv(client, buf + 1, len);
+	dev_dbg(&client->dev, "recv2: %d\n", r);
+
+	if (r != len)
+		return -EREMOTEIO;
+
+	usleep_range(3000, 6000);
+
+	return r + 1;
+}
+
+static int pn544_fw_write(struct i2c_client *client, u8 *buf, int len)
+{
+	int r;
+
+	dev_dbg(&client->dev, "%s\n", __func__);
+
+	if (len < PN544_FW_HEADER_SIZE ||
+	    (PN544_FW_HEADER_SIZE + (buf[1] << 8) + buf[2]) != len)
+		return -EINVAL;
+
+	r = i2c_master_send(client, buf, len);
+	dev_dbg(&client->dev, "fw send: %d\n", r);
+
+	if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+		usleep_range(6000, 10000);
+		r = i2c_master_send(client, buf, len);
+		dev_dbg(&client->dev, "fw send2: %d\n", r);
+	}
+
+	if (r != len)
+		return -EREMOTEIO;
+
+	return r;
+}
+
+static int pn544_fw_read(struct i2c_client *client, u8 *buf, int buflen)
+{
+	int r, len;
+
+	if (buflen < PN544_FW_HEADER_SIZE)
+		return -EINVAL;
+
+	r = i2c_master_recv(client, buf, PN544_FW_HEADER_SIZE);
+	dev_dbg(&client->dev, "FW recv1: %d\n", r);
+
+	if (r < 0)
+		return r;
+
+	if (r < PN544_FW_HEADER_SIZE)
+		return -EINVAL;
+
+	len = (buf[1] << 8) + buf[2];
+	if (len == 0) /* just header, no additional data */
+		return r;
+
+	if (len > buflen - PN544_FW_HEADER_SIZE)
+		return -EMSGSIZE;
+
+	r = i2c_master_recv(client, buf + PN544_FW_HEADER_SIZE, len);
+	dev_dbg(&client->dev, "fw recv2: %d\n", r);
+
+	if (r != len)
+		return -EINVAL;
+
+	return r + PN544_FW_HEADER_SIZE;
+}
+
+static irqreturn_t pn544_irq_thread_fn(int irq, void *dev_id)
+{
+	struct pn544_info *info = dev_id;
+	struct i2c_client *client = info->i2c_dev;
+
+	BUG_ON(!info);
+	BUG_ON(irq != info->i2c_dev->irq);
+
+	dev_dbg(&client->dev, "IRQ\n");
+
+	mutex_lock(&info->read_mutex);
+	info->read_irq = PN544_INT;
+	mutex_unlock(&info->read_mutex);
+
+	wake_up_interruptible(&info->read_wait);
+
+	return IRQ_HANDLED;
+}
+
+static enum pn544_irq pn544_irq_state(struct pn544_info *info)
+{
+	enum pn544_irq irq;
+
+	mutex_lock(&info->read_mutex);
+	irq = info->read_irq;
+	mutex_unlock(&info->read_mutex);
+	/*
+	 * XXX: should we check GPIO-line status directly?
+	 * return pdata->irq_status() ? PN544_INT : PN544_NONE;
+	 */
+
+	return irq;
+}
+
+static ssize_t pn544_read(struct file *file, char __user *buf,
+			  size_t count, loff_t *offset)
+{
+	struct pn544_info *info = container_of(file->private_data,
+					       struct pn544_info, miscdev);
+	struct i2c_client *client = info->i2c_dev;
+	enum pn544_irq irq;
+	size_t len;
+	int r = 0;
+
+	dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__,
+		info, count);
+
+	mutex_lock(&info->mutex);
+
+	if (info->state == PN544_ST_COLD) {
+		r = -ENODEV;
+		goto out;
+	}
+
+	irq = pn544_irq_state(info);
+	if (irq == PN544_NONE) {
+		if (file->f_flags & O_NONBLOCK) {
+			r = -EAGAIN;
+			goto out;
+		}
+
+		if (wait_event_interruptible(info->read_wait,
+					     (info->read_irq == PN544_INT))) {
+			r = -ERESTARTSYS;
+			goto out;
+		}
+	}
+
+	if (info->state == PN544_ST_FW_READY) {
+		len = min(count, info->buflen);
+
+		mutex_lock(&info->read_mutex);
+		r = pn544_fw_read(info->i2c_dev, info->buf, len);
+		info->read_irq = PN544_NONE;
+		mutex_unlock(&info->read_mutex);
+
+		if (r < 0) {
+			dev_err(&info->i2c_dev->dev, "FW read failed: %d\n", r);
+			goto out;
+		}
+
+		print_hex_dump(KERN_DEBUG, "FW read: ", DUMP_PREFIX_NONE,
+			       16, 2, info->buf, r, false);
+
+		*offset += r;
+		if (copy_to_user(buf, info->buf, r)) {
+			r = -EFAULT;
+			goto out;
+		}
+	} else {
+		len = min(count, info->buflen);
+
+		mutex_lock(&info->read_mutex);
+		r = pn544_i2c_read(info->i2c_dev, info->buf, len);
+		info->read_irq = PN544_NONE;
+		mutex_unlock(&info->read_mutex);
+
+		if (r < 0) {
+			dev_err(&info->i2c_dev->dev, "read failed (%d)\n", r);
+			goto out;
+		}
+		print_hex_dump(KERN_DEBUG, "read: ", DUMP_PREFIX_NONE,
+			       16, 2, info->buf, r, false);
+
+		*offset += r;
+		if (copy_to_user(buf, info->buf, r)) {
+			r = -EFAULT;
+			goto out;
+		}
+	}
+
+out:
+	mutex_unlock(&info->mutex);
+
+	return r;
+}
+
+static unsigned int pn544_poll(struct file *file, poll_table *wait)
+{
+	struct pn544_info *info = container_of(file->private_data,
+					       struct pn544_info, miscdev);
+	struct i2c_client *client = info->i2c_dev;
+	int r = 0;
+
+	dev_dbg(&client->dev, "%s: info: %p\n", __func__, info);
+
+	mutex_lock(&info->mutex);
+
+	if (info->state == PN544_ST_COLD) {
+		r = -ENODEV;
+		goto out;
+	}
+
+	poll_wait(file, &info->read_wait, wait);
+
+	if (pn544_irq_state(info) == PN544_INT) {
+		r = POLLIN | POLLRDNORM;
+		goto out;
+	}
+out:
+	mutex_unlock(&info->mutex);
+
+	return r;
+}
+
+static ssize_t pn544_write(struct file *file, const char __user *buf,
+			   size_t count, loff_t *ppos)
+{
+	struct pn544_info *info = container_of(file->private_data,
+					       struct pn544_info, miscdev);
+	struct i2c_client *client = info->i2c_dev;
+	ssize_t	len;
+	int r;
+
+	dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__,
+		info, count);
+
+	mutex_lock(&info->mutex);
+
+	if (info->state == PN544_ST_COLD) {
+		r = -ENODEV;
+		goto out;
+	}
+
+	/*
+	 * XXX: should we detect rset-writes and clean possible
+	 * read_irq state
+	 */
+	if (info->state == PN544_ST_FW_READY) {
+		size_t fw_len;
+
+		if (count < PN544_FW_HEADER_SIZE) {
+			r = -EINVAL;
+			goto out;
+		}
+
+		len = min(count, info->buflen);
+		if (copy_from_user(info->buf, buf, len)) {
+			r = -EFAULT;
+			goto out;
+		}
+
+		print_hex_dump(KERN_DEBUG, "FW write: ", DUMP_PREFIX_NONE,
+			       16, 2, info->buf, len, false);
+
+		fw_len = PN544_FW_HEADER_SIZE + (info->buf[1] << 8) +
+			info->buf[2];
+
+		if (len > fw_len) /* 1 msg at a time */
+			len = fw_len;
+
+		r = pn544_fw_write(info->i2c_dev, info->buf, len);
+	} else {
+		if (count < PN544_LLC_MIN_SIZE) {
+			r = -EINVAL;
+			goto out;
+		}
+
+		len = min(count, info->buflen);
+		if (copy_from_user(info->buf, buf, len)) {
+			r = -EFAULT;
+			goto out;
+		}
+
+		print_hex_dump(KERN_DEBUG, "write: ", DUMP_PREFIX_NONE,
+			       16, 2, info->buf, len, false);
+
+		if (len > (info->buf[0] + 1)) /* 1 msg at a time */
+			len  = info->buf[0] + 1;
+
+		r = pn544_i2c_write(info->i2c_dev, info->buf, len);
+	}
+out:
+	mutex_unlock(&info->mutex);
+
+	return r;
+
+}
+
+static long pn544_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct pn544_info *info = container_of(file->private_data,
+					       struct pn544_info, miscdev);
+	struct i2c_client *client = info->i2c_dev;
+	struct pn544_nfc_platform_data *pdata;
+	unsigned int val;
+	int r = 0;
+
+	dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n", __func__, info, cmd);
+
+	mutex_lock(&info->mutex);
+
+	if (info->state == PN544_ST_COLD) {
+		r = -ENODEV;
+		goto out;
+	}
+
+	pdata = info->i2c_dev->dev.platform_data;
+	switch (cmd) {
+	case PN544_GET_FW_MODE:
+		dev_dbg(&client->dev, "%s:  PN544_GET_FW_MODE\n", __func__);
+
+		val = (info->state == PN544_ST_FW_READY);
+		if (copy_to_user((void __user *)arg, &val, sizeof(val))) {
+			r = -EFAULT;
+			goto out;
+		}
+
+		break;
+
+	case PN544_SET_FW_MODE:
+		dev_dbg(&client->dev, "%s:  PN544_SET_FW_MODE\n", __func__);
+
+		if (copy_from_user(&val, (void __user *)arg, sizeof(val))) {
+			r = -EFAULT;
+			goto out;
+		}
+
+		if (val) {
+			if (info->state == PN544_ST_FW_READY)
+				break;
+
+			pn544_disable(info);
+			r = pn544_enable(info, FW_MODE);
+			if (r < 0)
+				goto out;
+		} else {
+			if (info->state == PN544_ST_READY)
+				break;
+			pn544_disable(info);
+			r = pn544_enable(info, HCI_MODE);
+			if (r < 0)
+				goto out;
+		}
+		file->f_pos = info->read_offset;
+		break;
+
+	case TCGETS:
+		dev_dbg(&client->dev, "%s:  TCGETS\n", __func__);
+
+		r = -ENOIOCTLCMD;
+		break;
+
+	default:
+		dev_err(&client->dev, "Unknown ioctl 0x%x\n", cmd);
+		r = -ENOIOCTLCMD;
+		break;
+	}
+
+out:
+	mutex_unlock(&info->mutex);
+
+	return r;
+}
+
+static int pn544_open(struct inode *inode, struct file *file)
+{
+	struct pn544_info *info = container_of(file->private_data,
+					       struct pn544_info, miscdev);
+	struct i2c_client *client = info->i2c_dev;
+	int r = 0;
+
+	dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
+		info, info->i2c_dev);
+
+	mutex_lock(&info->mutex);
+
+	/*
+	 * Only 1 at a time.
+	 * XXX: maybe user (counter) would work better
+	 */
+	if (info->state != PN544_ST_COLD) {
+		r = -EBUSY;
+		goto out;
+	}
+
+	file->f_pos = info->read_offset;
+	r = pn544_enable(info, HCI_MODE);
+
+out:
+	mutex_unlock(&info->mutex);
+	return r;
+}
+
+static int pn544_close(struct inode *inode, struct file *file)
+{
+	struct pn544_info *info = container_of(file->private_data,
+					       struct pn544_info, miscdev);
+	struct i2c_client *client = info->i2c_dev;
+
+	dev_dbg(&client->dev, "%s: info: %p, client %p\n",
+		__func__, info, info->i2c_dev);
+
+	mutex_lock(&info->mutex);
+	pn544_disable(info);
+	mutex_unlock(&info->mutex);
+
+	return 0;
+}
+
+static const struct file_operations pn544_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= pn544_read,
+	.write		= pn544_write,
+	.poll		= pn544_poll,
+	.open		= pn544_open,
+	.release	= pn544_close,
+	.unlocked_ioctl	= pn544_ioctl,
+};
+
+#ifdef CONFIG_PM
+static int pn544_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pn544_info *info;
+	int r = 0;
+
+	dev_info(&client->dev, "***\n%s: client %p\n***\n", __func__, client);
+
+	info = i2c_get_clientdata(client);
+	dev_info(&client->dev, "%s: info: %p, client %p\n", __func__,
+		 info, client);
+
+	mutex_lock(&info->mutex);
+
+	switch (info->state) {
+	case PN544_ST_FW_READY:
+		/* Do not suspend while upgrading FW, please! */
+		r = -EPERM;
+		break;
+
+	case PN544_ST_READY:
+		/*
+		 * CHECK: Device should be in standby-mode. No way to check?
+		 * Allowing low power mode for the regulator is potentially
+		 * dangerous if pn544 does not go to suspension.
+		 */
+		break;
+
+	case PN544_ST_COLD:
+		break;
+	};
+
+	mutex_unlock(&info->mutex);
+	return r;
+}
+
+static int pn544_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pn544_info *info = i2c_get_clientdata(client);
+	int r = 0;
+
+	dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
+		info, client);
+
+	mutex_lock(&info->mutex);
+
+	switch (info->state) {
+	case PN544_ST_READY:
+		/*
+		 * CHECK: If regulator low power mode is allowed in
+		 * pn544_suspend, we should go back to normal mode
+		 * here.
+		 */
+		break;
+
+	case PN544_ST_COLD:
+		break;
+
+	case PN544_ST_FW_READY:
+		break;
+	};
+
+	mutex_unlock(&info->mutex);
+
+	return r;
+}
+
+static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume);
+#endif
+
+static struct device_attribute pn544_attr =
+	__ATTR(nfc_test, S_IRUGO, pn544_test, NULL);
+
+static int __devinit pn544_probe(struct i2c_client *client,
+				 const struct i2c_device_id *id)
+{
+	struct pn544_info *info;
+	struct pn544_nfc_platform_data *pdata;
+	int r = 0;
+
+	dev_dbg(&client->dev, "%s\n", __func__);
+	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
+
+	/* private data allocation */
+	info = kzalloc(sizeof(struct pn544_info), GFP_KERNEL);
+	if (!info) {
+		dev_err(&client->dev,
+			"Cannot allocate memory for pn544_info.\n");
+		r = -ENOMEM;
+		goto err_info_alloc;
+	}
+
+	info->buflen = max(PN544_MSG_MAX_SIZE, PN544_MAX_I2C_TRANSFER);
+	info->buf = kzalloc(info->buflen, GFP_KERNEL);
+	if (!info->buf) {
+		dev_err(&client->dev,
+			"Cannot allocate memory for pn544_info->buf.\n");
+		r = -ENOMEM;
+		goto err_buf_alloc;
+	}
+
+	info->regs[0].supply = reg_vdd_io;
+	info->regs[1].supply = reg_vbat;
+	info->regs[2].supply = reg_vsim;
+	r = regulator_bulk_get(&client->dev, ARRAY_SIZE(info->regs),
+				 info->regs);
+	if (r < 0)
+		goto err_kmalloc;
+
+	info->i2c_dev = client;
+	info->state = PN544_ST_COLD;
+	info->read_irq = PN544_NONE;
+	mutex_init(&info->read_mutex);
+	mutex_init(&info->mutex);
+	init_waitqueue_head(&info->read_wait);
+	i2c_set_clientdata(client, info);
+	pdata = client->dev.platform_data;
+	if (!pdata) {
+		dev_err(&client->dev, "No platform data\n");
+		r = -EINVAL;
+		goto err_reg;
+	}
+
+	if (!pdata->request_resources) {
+		dev_err(&client->dev, "request_resources() missing\n");
+		r = -EINVAL;
+		goto err_reg;
+	}
+
+	r = pdata->request_resources(client);
+	if (r) {
+		dev_err(&client->dev, "Cannot get platform resources\n");
+		goto err_reg;
+	}
+
+	r = request_threaded_irq(client->irq, NULL, pn544_irq_thread_fn,
+				 IRQF_TRIGGER_RISING, PN544_DRIVER_NAME,
+				 info);
+	if (r < 0) {
+		dev_err(&client->dev, "Unable to register IRQ handler\n");
+		goto err_res;
+	}
+
+	/* If we don't have the test we don't need the sysfs file */
+	if (pdata->test) {
+		r = device_create_file(&client->dev, &pn544_attr);
+		if (r) {
+			dev_err(&client->dev,
+				"sysfs registration failed, error %d\n", r);
+			goto err_irq;
+		}
+	}
+
+	info->miscdev.minor = MISC_DYNAMIC_MINOR;
+	info->miscdev.name = PN544_DRIVER_NAME;
+	info->miscdev.fops = &pn544_fops;
+	info->miscdev.parent = &client->dev;
+	r = misc_register(&info->miscdev);
+	if (r < 0) {
+		dev_err(&client->dev, "Device registration failed\n");
+		goto err_sysfs;
+	}
+
+	dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n",
+		__func__, info, pdata, client);
+
+	return 0;
+
+err_sysfs:
+	if (pdata->test)
+		device_remove_file(&client->dev, &pn544_attr);
+err_irq:
+	free_irq(client->irq, info);
+err_res:
+	if (pdata->free_resources)
+		pdata->free_resources();
+err_reg:
+	regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
+err_kmalloc:
+	kfree(info->buf);
+err_buf_alloc:
+	kfree(info);
+err_info_alloc:
+	return r;
+}
+
+static __devexit int pn544_remove(struct i2c_client *client)
+{
+	struct pn544_info *info = i2c_get_clientdata(client);
+	struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
+
+	dev_dbg(&client->dev, "%s\n", __func__);
+
+	misc_deregister(&info->miscdev);
+	if (pdata->test)
+		device_remove_file(&client->dev, &pn544_attr);
+
+	if (info->state != PN544_ST_COLD) {
+		if (pdata->disable)
+			pdata->disable();
+
+		info->read_irq = PN544_NONE;
+	}
+
+	free_irq(client->irq, info);
+	if (pdata->free_resources)
+		pdata->free_resources();
+
+	regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
+	kfree(info->buf);
+	kfree(info);
+
+	return 0;
+}
+
+static struct i2c_driver pn544_driver = {
+	.driver = {
+		.name = PN544_DRIVER_NAME,
+#ifdef CONFIG_PM
+		.pm = &pn544_pm_ops,
+#endif
+	},
+	.probe = pn544_probe,
+	.id_table = pn544_id_table,
+	.remove = __devexit_p(pn544_remove),
+};
+
+static int __init pn544_init(void)
+{
+	int r;
+
+	pr_debug(DRIVER_DESC ": %s\n", __func__);
+
+	r = i2c_add_driver(&pn544_driver);
+	if (r) {
+		pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
+		return r;
+	}
+
+	return 0;
+}
+
+static void __exit pn544_exit(void)
+{
+	i2c_del_driver(&pn544_driver);
+	pr_info(DRIVER_DESC ", Exiting.\n");
+}
+
+module_init(pn544_init);
+module_exit(pn544_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);