NFC: Separate pn544 hci driver in HW dependant and independant parts

The driver now has all HCI stuff isolated in one file, and all the
hardware link specifics in another. Writing a pn544 driver on top of
another hardware link is now just a matter of adding a new file for that
new hardware specifics.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 0 insertions, 1252 deletions

diff --git a/drivers/nfc/pn544_hci.c b/drivers/nfc/pn544_hci.c
deleted file mode 100644
index 70858b5f81e4..000000000000
--- a/drivers/nfc/pn544_hci.c
+++ /dev/null
@@ -1,1252 +0,0 @@
-/*
- * HCI based Driver for NXP PN544 NFC Chip
- *
- * Copyright (C) 2012  Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions 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/crc-ccitt.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/miscdevice.h>
-#include <linux/interrupt.h>
-#include <linux/gpio.h>
-#include <linux/i2c.h>
-
-#include <linux/nfc.h>
-#include <net/nfc/hci.h>
-#include <net/nfc/llc.h>
-
-#include <linux/nfc/pn544.h>
-
-#define DRIVER_DESC "HCI NFC driver for PN544"
-
-#define PN544_HCI_DRIVER_NAME "pn544_hci"
-
-/* Timing restrictions (ms) */
-#define PN544_HCI_RESETVEN_TIME		30
-
-static struct i2c_device_id pn544_hci_id_table[] = {
-	{"pn544", 0},
-	{}
-};
-
-MODULE_DEVICE_TABLE(i2c, pn544_hci_id_table);
-
-#define HCI_MODE 0
-#define FW_MODE 1
-
-/* framing in HCI mode */
-#define PN544_HCI_LLC_LEN		1
-#define PN544_HCI_LLC_CRC		2
-#define PN544_HCI_LLC_LEN_CRC		(PN544_HCI_LLC_LEN + PN544_HCI_LLC_CRC)
-#define PN544_HCI_LLC_MIN_SIZE		(1 + PN544_HCI_LLC_LEN_CRC)
-#define PN544_HCI_LLC_MAX_PAYLOAD	29
-#define PN544_HCI_LLC_MAX_SIZE		(PN544_HCI_LLC_LEN_CRC + 1 + \
-					 PN544_HCI_LLC_MAX_PAYLOAD)
-
-enum pn544_state {
-	PN544_ST_COLD,
-	PN544_ST_FW_READY,
-	PN544_ST_READY,
-};
-
-#define FULL_VERSION_LEN 11
-
-/* Proprietary commands */
-#define PN544_WRITE		0x3f
-
-/* Proprietary gates, events, commands and registers */
-
-/* NFC_HCI_RF_READER_A_GATE additional registers and commands */
-#define PN544_RF_READER_A_AUTO_ACTIVATION			0x10
-#define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION		0x12
-#define PN544_MIFARE_CMD					0x21
-
-/* Commands that apply to all RF readers */
-#define PN544_RF_READER_CMD_PRESENCE_CHECK	0x30
-#define PN544_RF_READER_CMD_ACTIVATE_NEXT	0x32
-
-/* NFC_HCI_ID_MGMT_GATE additional registers */
-#define PN544_ID_MGMT_FULL_VERSION_SW		0x10
-
-#define PN544_RF_READER_ISO15693_GATE		0x12
-
-#define PN544_RF_READER_F_GATE			0x14
-#define PN544_FELICA_ID				0x04
-#define PN544_FELICA_RAW			0x20
-
-#define PN544_RF_READER_JEWEL_GATE		0x15
-#define PN544_JEWEL_RAW_CMD			0x23
-
-#define PN544_RF_READER_NFCIP1_INITIATOR_GATE	0x30
-#define PN544_RF_READER_NFCIP1_TARGET_GATE	0x31
-
-#define PN544_SYS_MGMT_GATE			0x90
-#define PN544_SYS_MGMT_INFO_NOTIFICATION	0x02
-
-#define PN544_POLLING_LOOP_MGMT_GATE		0x94
-#define PN544_DEP_MODE				0x01
-#define PN544_DEP_ATR_REQ			0x02
-#define PN544_DEP_ATR_RES			0x03
-#define PN544_DEP_MERGE				0x0D
-#define PN544_PL_RDPHASES			0x06
-#define PN544_PL_EMULATION			0x07
-#define PN544_PL_NFCT_DEACTIVATED		0x09
-
-#define PN544_SWP_MGMT_GATE			0xA0
-
-#define PN544_NFC_WI_MGMT_GATE			0xA1
-
-#define PN544_HCI_EVT_SND_DATA			0x01
-#define PN544_HCI_EVT_ACTIVATED			0x02
-#define PN544_HCI_EVT_DEACTIVATED		0x03
-#define PN544_HCI_EVT_RCV_DATA			0x04
-#define PN544_HCI_EVT_CONTINUE_MI		0x05
-
-#define PN544_HCI_CMD_ATTREQUEST		0x12
-#define PN544_HCI_CMD_CONTINUE_ACTIVATION	0x13
-
-static struct nfc_hci_gate pn544_gates[] = {
-	{NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE},
-	{NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
-	{NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
-	{NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE},
-	{NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
-	{NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_SYS_MGMT_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_SWP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_POLLING_LOOP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_NFC_WI_MGMT_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_RF_READER_JEWEL_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_RF_READER_NFCIP1_INITIATOR_GATE, NFC_HCI_INVALID_PIPE},
-	{PN544_RF_READER_NFCIP1_TARGET_GATE, NFC_HCI_INVALID_PIPE}
-};
-
-/* Largest headroom needed for outgoing custom commands */
-#define PN544_CMDS_HEADROOM	2
-#define PN544_FRAME_HEADROOM 1
-#define PN544_FRAME_TAILROOM 2
-
-struct pn544_hci_info {
-	struct i2c_client *i2c_dev;
-	struct nfc_hci_dev *hdev;
-
-	enum pn544_state state;
-
-	struct mutex info_lock;
-
-	unsigned int gpio_en;
-	unsigned int gpio_irq;
-	unsigned int gpio_fw;
-	unsigned int en_polarity;
-
-	int hard_fault;		/*
-				 * < 0 if hardware error occured (e.g. i2c err)
-				 * and prevents normal operation.
-				 */
-	int async_cb_type;
-	data_exchange_cb_t async_cb;
-	void *async_cb_context;
-};
-
-static void pn544_hci_platform_init(struct pn544_hci_info *info)
-{
-	int polarity, retry, ret;
-	char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
-	int count = sizeof(rset_cmd);
-
-	pr_info(DRIVER_DESC ": %s\n", __func__);
-	dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n");
-
-	/* Disable fw download */
-	gpio_set_value(info->gpio_fw, 0);
-
-	for (polarity = 0; polarity < 2; polarity++) {
-		info->en_polarity = polarity;
-		retry = 3;
-		while (retry--) {
-			/* power off */
-			gpio_set_value(info->gpio_en, !info->en_polarity);
-			usleep_range(10000, 15000);
-
-			/* power on */
-			gpio_set_value(info->gpio_en, info->en_polarity);
-			usleep_range(10000, 15000);
-
-			/* send reset */
-			dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n");
-			ret = i2c_master_send(info->i2c_dev, rset_cmd, count);
-			if (ret == count) {
-				dev_info(&info->i2c_dev->dev,
-					 "nfc_en polarity : active %s\n",
-					 (polarity == 0 ? "low" : "high"));
-				goto out;
-			}
-		}
-	}
-
-	dev_err(&info->i2c_dev->dev,
-		"Could not detect nfc_en polarity, fallback to active high\n");
-
-out:
-	gpio_set_value(info->gpio_en, !info->en_polarity);
-}
-
-static int pn544_hci_enable(struct pn544_hci_info *info, int mode)
-{
-	pr_info(DRIVER_DESC ": %s\n", __func__);
-
-	gpio_set_value(info->gpio_fw, 0);
-	gpio_set_value(info->gpio_en, info->en_polarity);
-	usleep_range(10000, 15000);
-
-	return 0;
-}
-
-static void pn544_hci_disable(struct pn544_hci_info *info)
-{
-	pr_info(DRIVER_DESC ": %s\n", __func__);
-
-	gpio_set_value(info->gpio_fw, 0);
-	gpio_set_value(info->gpio_en, !info->en_polarity);
-	usleep_range(10000, 15000);
-
-	gpio_set_value(info->gpio_en, info->en_polarity);
-	usleep_range(10000, 15000);
-
-	gpio_set_value(info->gpio_en, !info->en_polarity);
-	usleep_range(10000, 15000);
-}
-
-static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
-{
-	int r;
-
-	usleep_range(3000, 6000);
-
-	r = i2c_master_send(client, buf, len);
-
-	if (r == -EREMOTEIO) {	/* Retry, chip was in standby */
-		usleep_range(6000, 10000);
-		r = i2c_master_send(client, buf, len);
-	}
-
-	if (r >= 0) {
-		if (r != len)
-			return -EREMOTEIO;
-		else
-			return 0;
-	}
-
-	return r;
-}
-
-static int check_crc(u8 *buf, int buflen)
-{
-	int len;
-	u16 crc;
-
-	len = buf[0] + 1;
-	crc = crc_ccitt(0xffff, buf, len - 2);
-	crc = ~crc;
-
-	if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
-		pr_err(PN544_HCI_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
-		       crc, buf[len - 1], buf[len - 2]);
-
-		pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
-		print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
-			       16, 2, buf, buflen, false);
-		return -EPERM;
-	}
-	return 0;
-}
-
-/*
- * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
- * that i2c bus will be flushed and that next read will start on a new frame.
- * returned skb contains only LLC header and payload.
- * returns:
- * -EREMOTEIO : i2c read error (fatal)
- * -EBADMSG : frame was incorrect and discarded
- * -ENOMEM : cannot allocate skb, frame dropped
- */
-static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb)
-{
-	int r;
-	u8 len;
-	u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1];
-
-	r = i2c_master_recv(client, &len, 1);
-	if (r != 1) {
-		dev_err(&client->dev, "cannot read len byte\n");
-		return -EREMOTEIO;
-	}
-
-	if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) ||
-	    (len > (PN544_HCI_LLC_MAX_SIZE - 1))) {
-		dev_err(&client->dev, "invalid len byte\n");
-		r = -EBADMSG;
-		goto flush;
-	}
-
-	*skb = alloc_skb(1 + len, GFP_KERNEL);
-	if (*skb == NULL) {
-		r = -ENOMEM;
-		goto flush;
-	}
-
-	*skb_put(*skb, 1) = len;
-
-	r = i2c_master_recv(client, skb_put(*skb, len), len);
-	if (r != len) {
-		kfree_skb(*skb);
-		return -EREMOTEIO;
-	}
-
-	r = check_crc((*skb)->data, (*skb)->len);
-	if (r != 0) {
-		kfree_skb(*skb);
-		r = -EBADMSG;
-		goto flush;
-	}
-
-	skb_pull(*skb, 1);
-	skb_trim(*skb, (*skb)->len - 2);
-
-	usleep_range(3000, 6000);
-
-	return 0;
-
-flush:
-	if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
-		r = -EREMOTEIO;
-
-	usleep_range(3000, 6000);
-
-	return r;
-}
-
-/*
- * Reads an shdlc frame from the chip. This is not as straightforward as it
- * seems. There are cases where we could loose the frame start synchronization.
- * The frame format is len-data-crc, and corruption can occur anywhere while
- * transiting on i2c bus, such that we could read an invalid len.
- * In order to recover synchronization with the next frame, we must be sure
- * to read the real amount of data without using the len byte. We do this by
- * assuming the following:
- * - the chip will always present only one single complete frame on the bus
- *   before triggering the interrupt
- * - the chip will not present a new frame until we have completely read
- *   the previous one (or until we have handled the interrupt).
- * The tricky case is when we read a corrupted len that is less than the real
- * len. We must detect this here in order to determine that we need to flush
- * the bus. This is the reason why we check the crc here.
- */
-static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
-{
-	struct pn544_hci_info *info = dev_id;
-	struct i2c_client *client;
-	struct sk_buff *skb = NULL;
-	int r;
-
-	if (!info || irq != info->i2c_dev->irq) {
-		WARN_ON_ONCE(1);
-		return IRQ_NONE;
-	}
-
-	client = info->i2c_dev;
-	dev_dbg(&client->dev, "IRQ\n");
-
-	if (info->hard_fault != 0)
-		return IRQ_HANDLED;
-
-	r = pn544_hci_i2c_read(client, &skb);
-	if (r == -EREMOTEIO) {
-		info->hard_fault = r;
-
-		nfc_hci_recv_frame(info->hdev, NULL);
-
-		return IRQ_HANDLED;
-	} else if ((r == -ENOMEM) || (r == -EBADMSG)) {
-		return IRQ_HANDLED;
-	}
-
-	nfc_hci_recv_frame(info->hdev, skb);
-
-	return IRQ_HANDLED;
-}
-
-static int pn544_hci_open(struct nfc_hci_dev *hdev)
-{
-	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
-	int r = 0;
-
-	mutex_lock(&info->info_lock);
-
-	if (info->state != PN544_ST_COLD) {
-		r = -EBUSY;
-		goto out;
-	}
-
-	r = pn544_hci_enable(info, HCI_MODE);
-
-	if (r == 0)
-		info->state = PN544_ST_READY;
-
-out:
-	mutex_unlock(&info->info_lock);
-	return r;
-}
-
-static void pn544_hci_close(struct nfc_hci_dev *hdev)
-{
-	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
-
-	mutex_lock(&info->info_lock);
-
-	if (info->state == PN544_ST_COLD)
-		goto out;
-
-	pn544_hci_disable(info);
-
-	info->state = PN544_ST_COLD;
-
-out:
-	mutex_unlock(&info->info_lock);
-}
-
-static int pn544_hci_ready(struct nfc_hci_dev *hdev)
-{
-	struct sk_buff *skb;
-	static struct hw_config {
-		u8 adr[2];
-		u8 value;
-	} hw_config[] = {
-		{{0x9f, 0x9a}, 0x00},
-
-		{{0x98, 0x10}, 0xbc},
-
-		{{0x9e, 0x71}, 0x00},
-
-		{{0x98, 0x09}, 0x00},
-
-		{{0x9e, 0xb4}, 0x00},
-
-		{{0x9e, 0xd9}, 0xff},
-		{{0x9e, 0xda}, 0xff},
-		{{0x9e, 0xdb}, 0x23},
-		{{0x9e, 0xdc}, 0x21},
-		{{0x9e, 0xdd}, 0x22},
-		{{0x9e, 0xde}, 0x24},
-
-		{{0x9c, 0x01}, 0x08},
-
-		{{0x9e, 0xaa}, 0x01},
-
-		{{0x9b, 0xd1}, 0x0d},
-		{{0x9b, 0xd2}, 0x24},
-		{{0x9b, 0xd3}, 0x0a},
-		{{0x9b, 0xd4}, 0x22},
-		{{0x9b, 0xd5}, 0x08},
-		{{0x9b, 0xd6}, 0x1e},
-		{{0x9b, 0xdd}, 0x1c},
-
-		{{0x9b, 0x84}, 0x13},
-		{{0x99, 0x81}, 0x7f},
-		{{0x99, 0x31}, 0x70},
-
-		{{0x98, 0x00}, 0x3f},
-
-		{{0x9f, 0x09}, 0x00},
-
-		{{0x9f, 0x0a}, 0x05},
-
-		{{0x9e, 0xd1}, 0xa1},
-		{{0x99, 0x23}, 0x00},
-
-		{{0x9e, 0x74}, 0x80},
-
-		{{0x9f, 0x28}, 0x10},
-
-		{{0x9f, 0x35}, 0x14},
-
-		{{0x9f, 0x36}, 0x60},
-
-		{{0x9c, 0x31}, 0x00},
-
-		{{0x9c, 0x32}, 0xc8},
-
-		{{0x9c, 0x19}, 0x40},
-
-		{{0x9c, 0x1a}, 0x40},
-
-		{{0x9c, 0x0c}, 0x00},
-
-		{{0x9c, 0x0d}, 0x00},
-
-		{{0x9c, 0x12}, 0x00},
-
-		{{0x9c, 0x13}, 0x00},
-
-		{{0x98, 0xa2}, 0x0e},
-
-		{{0x98, 0x93}, 0x40},
-
-		{{0x98, 0x7d}, 0x02},
-		{{0x98, 0x7e}, 0x00},
-		{{0x9f, 0xc8}, 0x01},
-	};
-	struct hw_config *p = hw_config;
-	int count = ARRAY_SIZE(hw_config);
-	struct sk_buff *res_skb;
-	u8 param[4];
-	int r;
-
-	param[0] = 0;
-	while (count--) {
-		param[1] = p->adr[0];
-		param[2] = p->adr[1];
-		param[3] = p->value;
-
-		r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
-				     param, 4, &res_skb);
-		if (r < 0)
-			return r;
-
-		if (res_skb->len != 1) {
-			kfree_skb(res_skb);
-			return -EPROTO;
-		}
-
-		if (res_skb->data[0] != p->value) {
-			kfree_skb(res_skb);
-			return -EIO;
-		}
-
-		kfree_skb(res_skb);
-
-		p++;
-	}
-
-	param[0] = NFC_HCI_UICC_HOST_ID;
-	r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
-			      NFC_HCI_ADMIN_WHITELIST, param, 1);
-	if (r < 0)
-		return r;
-
-	param[0] = 0x3d;
-	r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
-			      PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
-	if (r < 0)
-		return r;
-
-	param[0] = 0x0;
-	r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
-			      PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
-	if (r < 0)
-		return r;
-
-	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
-			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
-	if (r < 0)
-		return r;
-
-	param[0] = 0x1;
-	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
-			      PN544_PL_NFCT_DEACTIVATED, param, 1);
-	if (r < 0)
-		return r;
-
-	param[0] = 0x0;
-	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
-			      PN544_PL_RDPHASES, param, 1);
-	if (r < 0)
-		return r;
-
-	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
-			      PN544_ID_MGMT_FULL_VERSION_SW, &skb);
-	if (r < 0)
-		return r;
-
-	if (skb->len != FULL_VERSION_LEN) {
-		kfree_skb(skb);
-		return -EINVAL;
-	}
-
-	print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
-		       DUMP_PREFIX_NONE, 16, 1,
-		       skb->data, FULL_VERSION_LEN, false);
-
-	kfree_skb(skb);
-
-	return 0;
-}
-
-static void pn544_hci_add_len_crc(struct sk_buff *skb)
-{
-	u16 crc;
-	int len;
-
-	len = skb->len + 2;
-	*skb_push(skb, 1) = len;
-
-	crc = crc_ccitt(0xffff, skb->data, skb->len);
-	crc = ~crc;
-	*skb_put(skb, 1) = crc & 0xff;
-	*skb_put(skb, 1) = crc >> 8;
-}
-
-static void pn544_hci_remove_len_crc(struct sk_buff *skb)
-{
-	skb_pull(skb, PN544_FRAME_HEADROOM);
-	skb_trim(skb, PN544_FRAME_TAILROOM);
-}
-
-static int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
-{
-	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
-	struct i2c_client *client = info->i2c_dev;
-	int r;
-
-	if (info->hard_fault != 0)
-		return info->hard_fault;
-
-	pn544_hci_add_len_crc(skb);
-	r = pn544_hci_i2c_write(client, skb->data, skb->len);
-	pn544_hci_remove_len_crc(skb);
-
-	return r;
-}
-
-static int pn544_hci_start_poll(struct nfc_hci_dev *hdev,
-				u32 im_protocols, u32 tm_protocols)
-{
-	u8 phases = 0;
-	int r;
-	u8 duration[2];
-	u8 activated;
-	u8 i_mode = 0x3f; /* Enable all supported modes */
-	u8 t_mode = 0x0f;
-	u8 t_merge = 0x01; /* Enable merge by default */
-
-	pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
-		__func__, im_protocols, tm_protocols);
-
-	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
-			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
-	if (r < 0)
-		return r;
-
-	duration[0] = 0x18;
-	duration[1] = 0x6a;
-	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
-			      PN544_PL_EMULATION, duration, 2);
-	if (r < 0)
-		return r;
-
-	activated = 0;
-	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
-			      PN544_PL_NFCT_DEACTIVATED, &activated, 1);
-	if (r < 0)
-		return r;
-
-	if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
-			 NFC_PROTO_JEWEL_MASK))
-		phases |= 1;		/* Type A */
-	if (im_protocols & NFC_PROTO_FELICA_MASK) {
-		phases |= (1 << 2);	/* Type F 212 */
-		phases |= (1 << 3);	/* Type F 424 */
-	}
-
-	phases |= (1 << 5);		/* NFC active */
-
-	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
-			      PN544_PL_RDPHASES, &phases, 1);
-	if (r < 0)
-		return r;
-
-	if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
-		hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
-							&hdev->gb_len);
-		pr_debug("generate local bytes %p", hdev->gb);
-		if (hdev->gb == NULL || hdev->gb_len == 0) {
-			im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
-			tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
-		}
-	}
-
-	if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
-		r = nfc_hci_send_event(hdev,
-				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-				NFC_HCI_EVT_END_OPERATION, NULL, 0);
-		if (r < 0)
-			return r;
-
-		r = nfc_hci_set_param(hdev,
-				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-				PN544_DEP_MODE, &i_mode, 1);
-		if (r < 0)
-			return r;
-
-		r = nfc_hci_set_param(hdev,
-				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-				PN544_DEP_ATR_REQ, hdev->gb, hdev->gb_len);
-		if (r < 0)
-			return r;
-
-		r = nfc_hci_send_event(hdev,
-				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-				NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
-		if (r < 0)
-			nfc_hci_send_event(hdev,
-					PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-					NFC_HCI_EVT_END_OPERATION, NULL, 0);
-	}
-
-	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
-		r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
-				PN544_DEP_MODE, &t_mode, 1);
-		if (r < 0)
-			return r;
-
-		r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
-				PN544_DEP_ATR_RES, hdev->gb, hdev->gb_len);
-		if (r < 0)
-			return r;
-
-		r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
-				PN544_DEP_MERGE, &t_merge, 1);
-		if (r < 0)
-			return r;
-	}
-
-	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
-			       NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
-	if (r < 0)
-		nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
-				   NFC_HCI_EVT_END_OPERATION, NULL, 0);
-
-	return r;
-}
-
-static int pn544_hci_dep_link_up(struct nfc_hci_dev *hdev,
-				struct nfc_target *target, u8 comm_mode,
-				u8 *gb, size_t gb_len)
-{
-	struct sk_buff *rgb_skb = NULL;
-	int r;
-
-	r = nfc_hci_get_param(hdev, target->hci_reader_gate,
-				PN544_DEP_ATR_RES, &rgb_skb);
-	if (r < 0)
-		return r;
-
-	if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
-		r = -EPROTO;
-		goto exit;
-	}
-	print_hex_dump(KERN_DEBUG, "remote gb: ", DUMP_PREFIX_OFFSET,
-			16, 1, rgb_skb->data, rgb_skb->len, true);
-
-	r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
-						rgb_skb->len);
-
-	if (r == 0)
-		r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
-					NFC_RF_INITIATOR);
-exit:
-	kfree_skb(rgb_skb);
-	return r;
-}
-
-static int pn544_hci_dep_link_down(struct nfc_hci_dev *hdev)
-{
-
-	return nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-					NFC_HCI_EVT_END_OPERATION, NULL, 0);
-}
-
-static int pn544_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
-				      struct nfc_target *target)
-{
-	switch (gate) {
-	case PN544_RF_READER_F_GATE:
-		target->supported_protocols = NFC_PROTO_FELICA_MASK;
-		break;
-	case PN544_RF_READER_JEWEL_GATE:
-		target->supported_protocols = NFC_PROTO_JEWEL_MASK;
-		target->sens_res = 0x0c00;
-		break;
-	case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
-		target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
-		break;
-	default:
-		return -EPROTO;
-	}
-
-	return 0;
-}
-
-static int pn544_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
-						u8 gate,
-						struct nfc_target *target)
-{
-	struct sk_buff *uid_skb;
-	int r = 0;
-
-	if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE)
-		return r;
-
-	if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
-		r = nfc_hci_send_cmd(hdev,
-			PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-			PN544_HCI_CMD_CONTINUE_ACTIVATION, NULL, 0, NULL);
-		if (r < 0)
-			return r;
-
-		target->hci_reader_gate = PN544_RF_READER_NFCIP1_INITIATOR_GATE;
-	} else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
-		if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
-		    target->nfcid1_len != 10)
-			return -EPROTO;
-
-		r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
-				     PN544_RF_READER_CMD_ACTIVATE_NEXT,
-				     target->nfcid1, target->nfcid1_len, NULL);
-	} else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
-		r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
-				      PN544_FELICA_ID, &uid_skb);
-		if (r < 0)
-			return r;
-
-		if (uid_skb->len != 8) {
-			kfree_skb(uid_skb);
-			return -EPROTO;
-		}
-
-		r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
-				     PN544_RF_READER_CMD_ACTIVATE_NEXT,
-				     uid_skb->data, uid_skb->len, NULL);
-		kfree_skb(uid_skb);
-
-		r = nfc_hci_send_cmd(hdev,
-					PN544_RF_READER_NFCIP1_INITIATOR_GATE,
-					PN544_HCI_CMD_CONTINUE_ACTIVATION,
-					NULL, 0, NULL);
-		if (r < 0)
-			return r;
-
-		target->hci_reader_gate = PN544_RF_READER_NFCIP1_INITIATOR_GATE;
-		target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
-	} else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
-		/*
-		 * TODO: maybe other ISO 14443 require some kind of continue
-		 * activation, but for now we've seen only this one below.
-		 */
-		if (target->sens_res == 0x4403)	/* Type 4 Mifare DESFire */
-			r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
-			      PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
-			      NULL, 0, NULL);
-	}
-
-	return r;
-}
-
-#define PN544_CB_TYPE_READER_F 1
-
-static void pn544_hci_data_exchange_cb(void *context, struct sk_buff *skb,
-				       int err)
-{
-	struct pn544_hci_info *info = context;
-
-	switch (info->async_cb_type) {
-	case PN544_CB_TYPE_READER_F:
-		if (err == 0)
-			skb_pull(skb, 1);
-		info->async_cb(info->async_cb_context, skb, err);
-		break;
-	default:
-		if (err == 0)
-			kfree_skb(skb);
-		break;
-	}
-}
-
-#define MIFARE_CMD_AUTH_KEY_A	0x60
-#define MIFARE_CMD_AUTH_KEY_B	0x61
-#define MIFARE_CMD_HEADER	2
-#define MIFARE_UID_LEN		4
-#define MIFARE_KEY_LEN		6
-#define MIFARE_CMD_LEN		12
-/*
- * Returns:
- * <= 0: driver handled the data exchange
- *    1: driver doesn't especially handle, please do standard processing
- */
-static int pn544_hci_im_transceive(struct nfc_hci_dev *hdev,
-				   struct nfc_target *target,
-				   struct sk_buff *skb, data_exchange_cb_t cb,
-				   void *cb_context)
-{
-	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
-
-	pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
-		target->hci_reader_gate);
-
-	switch (target->hci_reader_gate) {
-	case NFC_HCI_RF_READER_A_GATE:
-		if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
-			/*
-			 * It seems that pn544 is inverting key and UID for
-			 * MIFARE authentication commands.
-			 */
-			if (skb->len == MIFARE_CMD_LEN &&
-			    (skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
-			     skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
-				u8 uid[MIFARE_UID_LEN];
-				u8 *data = skb->data + MIFARE_CMD_HEADER;
-
-				memcpy(uid, data + MIFARE_KEY_LEN,
-				       MIFARE_UID_LEN);
-				memmove(data + MIFARE_UID_LEN, data,
-					MIFARE_KEY_LEN);
-				memcpy(data, uid, MIFARE_UID_LEN);
-			}
-
-			return nfc_hci_send_cmd_async(hdev,
-						      target->hci_reader_gate,
-						      PN544_MIFARE_CMD,
-						      skb->data, skb->len,
-						      cb, cb_context);
-		} else
-			return 1;
-	case PN544_RF_READER_F_GATE:
-		*skb_push(skb, 1) = 0;
-		*skb_push(skb, 1) = 0;
-
-		info->async_cb_type = PN544_CB_TYPE_READER_F;
-		info->async_cb = cb;
-		info->async_cb_context = cb_context;
-
-		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
-					      PN544_FELICA_RAW, skb->data,
-					      skb->len,
-					      pn544_hci_data_exchange_cb, info);
-	case PN544_RF_READER_JEWEL_GATE:
-		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
-					      PN544_JEWEL_RAW_CMD, skb->data,
-					      skb->len, cb, cb_context);
-	case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
-		*skb_push(skb, 1) = 0;
-
-		return nfc_hci_send_event(hdev, target->hci_reader_gate,
-					PN544_HCI_EVT_SND_DATA, skb->data,
-					skb->len);
-	default:
-		return 1;
-	}
-}
-
-static int pn544_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
-{
-	/* Set default false for multiple information chaining */
-	*skb_push(skb, 1) = 0;
-
-	return nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
-				PN544_HCI_EVT_SND_DATA, skb->data, skb->len);
-}
-
-static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
-				   struct nfc_target *target)
-{
-	pr_debug("supported protocol %d", target->supported_protocols);
-	if (target->supported_protocols & (NFC_PROTO_ISO14443_MASK |
-					NFC_PROTO_ISO14443_B_MASK)) {
-		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
-					PN544_RF_READER_CMD_PRESENCE_CHECK,
-					NULL, 0, NULL);
-	} else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
-		if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
-		    target->nfcid1_len != 10)
-			return -EOPNOTSUPP;
-
-		 return nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
-				     PN544_RF_READER_CMD_ACTIVATE_NEXT,
-				     target->nfcid1, target->nfcid1_len, NULL);
-	} else if (target->supported_protocols & NFC_PROTO_JEWEL_MASK) {
-		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
-					PN544_JEWEL_RAW_CMD, NULL, 0, NULL);
-	} else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
-		return nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
-					PN544_FELICA_RAW, NULL, 0, NULL);
-	} else if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
-		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
-					PN544_HCI_CMD_ATTREQUEST,
-					NULL, 0, NULL);
-	}
-
-	return 0;
-}
-
-void pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate, u8 event,
-				struct sk_buff *skb)
-{
-	struct sk_buff *rgb_skb = NULL;
-	int r = 0;
-
-	pr_debug("hci event %d", event);
-	switch (event) {
-	case PN544_HCI_EVT_ACTIVATED:
-		if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE)
-			nfc_hci_target_discovered(hdev, gate);
-		else if (gate == PN544_RF_READER_NFCIP1_TARGET_GATE) {
-			r = nfc_hci_get_param(hdev, gate, PN544_DEP_ATR_REQ,
-						&rgb_skb);
-
-			if (r < 0)
-				goto exit;
-
-			nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
-					NFC_COMM_PASSIVE, rgb_skb->data,
-					rgb_skb->len);
-
-			kfree_skb(rgb_skb);
-		}
-
-		break;
-	case PN544_HCI_EVT_DEACTIVATED:
-		nfc_hci_send_event(hdev, gate,
-			NFC_HCI_EVT_END_OPERATION, NULL, 0);
-		break;
-	case PN544_HCI_EVT_RCV_DATA:
-		if (skb->len < 2) {
-			r = -EPROTO;
-			goto exit;
-		}
-
-		if (skb->data[0] != 0) {
-			pr_debug("data0 %d", skb->data[0]);
-			r = -EPROTO;
-			goto exit;
-		}
-
-		skb_pull(skb, 2);
-		nfc_tm_data_received(hdev->ndev, skb);
-
-		return;
-	default:
-		break;
-	}
-
-exit:
-	kfree_skb(skb);
-}
-
-static struct nfc_hci_ops pn544_hci_ops = {
-	.open = pn544_hci_open,
-	.close = pn544_hci_close,
-	.hci_ready = pn544_hci_ready,
-	.xmit = pn544_hci_xmit,
-	.start_poll = pn544_hci_start_poll,
-	.dep_link_up = pn544_hci_dep_link_up,
-	.dep_link_down = pn544_hci_dep_link_down,
-	.target_from_gate = pn544_hci_target_from_gate,
-	.complete_target_discovered = pn544_hci_complete_target_discovered,
-	.im_transceive = pn544_hci_im_transceive,
-	.tm_send = pn544_hci_tm_send,
-	.check_presence = pn544_hci_check_presence,
-	.event_received = pn544_hci_event_received,
-};
-
-static int __devinit pn544_hci_probe(struct i2c_client *client,
-				     const struct i2c_device_id *id)
-{
-	struct pn544_hci_info *info;
-	struct pn544_nfc_platform_data *pdata;
-	int r = 0;
-	u32 protocols;
-	struct nfc_hci_init_data init_data;
-
-	dev_dbg(&client->dev, "%s\n", __func__);
-	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
-
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
-		dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
-		return -ENODEV;
-	}
-
-	info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
-	if (!info) {
-		dev_err(&client->dev,
-			"Cannot allocate memory for pn544_hci_info.\n");
-		r = -ENOMEM;
-		goto err_info_alloc;
-	}
-
-	info->i2c_dev = client;
-	info->state = PN544_ST_COLD;
-	mutex_init(&info->info_lock);
-	i2c_set_clientdata(client, info);
-
-	pdata = client->dev.platform_data;
-	if (pdata == NULL) {
-		dev_err(&client->dev, "No platform data\n");
-		r = -EINVAL;
-		goto err_pdata;
-	}
-
-	if (pdata->request_resources == NULL) {
-		dev_err(&client->dev, "request_resources() missing\n");
-		r = -EINVAL;
-		goto err_pdata;
-	}
-
-	r = pdata->request_resources(client);
-	if (r) {
-		dev_err(&client->dev, "Cannot get platform resources\n");
-		goto err_pdata;
-	}
-
-	info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
-	info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
-	info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
-
-	pn544_hci_platform_init(info);
-
-	r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn,
-				 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
-				 PN544_HCI_DRIVER_NAME, info);
-	if (r < 0) {
-		dev_err(&client->dev, "Unable to register IRQ handler\n");
-		goto err_rti;
-	}
-
-	init_data.gate_count = ARRAY_SIZE(pn544_gates);
-
-	memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates));
-
-	/*
-	 * TODO: Session id must include the driver name + some bus addr
-	 * persistent info to discriminate 2 identical chips
-	 */
-	strcpy(init_data.session_id, "ID544HCI");
-
-	protocols = NFC_PROTO_JEWEL_MASK |
-		    NFC_PROTO_MIFARE_MASK |
-		    NFC_PROTO_FELICA_MASK |
-		    NFC_PROTO_ISO14443_MASK |
-		    NFC_PROTO_ISO14443_B_MASK |
-		    NFC_PROTO_NFC_DEP_MASK;
-
-	info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data,
-					     protocols, LLC_SHDLC_NAME,
-					     PN544_FRAME_HEADROOM +
-					     PN544_CMDS_HEADROOM,
-					     PN544_FRAME_TAILROOM,
-					     PN544_HCI_LLC_MAX_PAYLOAD);
-	if (!info->hdev) {
-		dev_err(&client->dev, "Cannot allocate nfc hdev.\n");
-		r = -ENOMEM;
-		goto err_alloc_hdev;
-	}
-
-	nfc_hci_set_clientdata(info->hdev, info);
-
-	r = nfc_hci_register_device(info->hdev);
-	if (r)
-		goto err_regdev;
-
-	return 0;
-
-err_regdev:
-	nfc_hci_free_device(info->hdev);
-
-err_alloc_hdev:
-	free_irq(client->irq, info);
-
-err_rti:
-	if (pdata->free_resources != NULL)
-		pdata->free_resources();
-
-err_pdata:
-	kfree(info);
-
-err_info_alloc:
-	return r;
-}
-
-static __devexit int pn544_hci_remove(struct i2c_client *client)
-{
-	struct pn544_hci_info *info = i2c_get_clientdata(client);
-	struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
-
-	dev_dbg(&client->dev, "%s\n", __func__);
-
-	nfc_hci_free_device(info->hdev);
-
-	if (info->state != PN544_ST_COLD) {
-		if (pdata->disable)
-			pdata->disable();
-	}
-
-	free_irq(client->irq, info);
-	if (pdata->free_resources)
-		pdata->free_resources();
-
-	kfree(info);
-
-	return 0;
-}
-
-static struct i2c_driver pn544_hci_driver = {
-	.driver = {
-		   .name = PN544_HCI_DRIVER_NAME,
-		  },
-	.probe = pn544_hci_probe,
-	.id_table = pn544_hci_id_table,
-	.remove = __devexit_p(pn544_hci_remove),
-};
-
-static int __init pn544_hci_init(void)
-{
-	int r;
-
-	pr_debug(DRIVER_DESC ": %s\n", __func__);
-
-	r = i2c_add_driver(&pn544_hci_driver);
-	if (r) {
-		pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n");
-		return r;
-	}
-
-	return 0;
-}
-
-static void __exit pn544_hci_exit(void)
-{
-	i2c_del_driver(&pn544_hci_driver);
-}
-
-module_init(pn544_hci_init);
-module_exit(pn544_hci_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION(DRIVER_DESC);