drivers/nfc/pn544/pn544.c - kernel/msm-4.9 - Gitiles

 /*
  * 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/delay.h>
 #include <linux/slab.h>
 #include <linux/module.h>

 #include <linux/nfc.h>
 #include <net/nfc/hci.h>
 #include <net/nfc/llc.h>

 #include "pn544.h"

 /* Timing restrictions (ms) */
 #define PN544_HCI_RESETVEN_TIME		30

 #define HCI_MODE 0
 #define FW_MODE 1

 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

 struct pn544_hci_info {
 	struct nfc_phy_ops *phy_ops;
 	void *phy_id;

 	struct nfc_hci_dev *hdev;

 	enum pn544_state state;

 	struct mutex info_lock;

 	int async_cb_type;
 	data_exchange_cb_t async_cb;
 	void *async_cb_context;
 };

 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 = info->phy_ops->enable(info->phy_id);

 	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;

 	info->phy_ops->disable(info->phy_id);

 	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 int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 {
 	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

 	return info->phy_ops->write(info->phy_id, skb);
 }

 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)
 {
 	int r;

 	/* Set default false for multiple information chaining */
 	*skb_push(skb, 1) = 0;

 	r = nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
 			       PN544_HCI_EVT_SND_DATA, skb->data, skb->len);

 	kfree_skb(skb);

 	return r;
 }

 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;
 }

 /*
  * Returns:
  * <= 0: driver handled the event, skb consumed
  *    1: driver does not handle the event, please do standard processing
  */
 static int 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;

 	pr_debug("hci event %d", event);
 	switch (event) {
 	case PN544_HCI_EVT_ACTIVATED:
 		if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE) {
 			r = 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;

 			r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
 					     NFC_COMM_PASSIVE, rgb_skb->data,
 					     rgb_skb->len);

 			kfree_skb(rgb_skb);
 		} else {
 			r = -EINVAL;
 		}
 		break;
 	case PN544_HCI_EVT_DEACTIVATED:
 		r = 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);
 		return nfc_tm_data_received(hdev->ndev, skb);
 	default:
 		return 1;
 	}

 exit:
 	kfree_skb(skb);

 	return r;
 }

 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,
 };

 int pn544_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name,
 		    int phy_headroom, int phy_tailroom, int phy_payload,
 		    struct nfc_hci_dev **hdev)
 {
 	struct pn544_hci_info *info;
 	u32 protocols, se;
 	struct nfc_hci_init_data init_data;
 	int r;

 	info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
 	if (!info) {
 		pr_err("Cannot allocate memory for pn544_hci_info.\n");
 		r = -ENOMEM;
 		goto err_info_alloc;
 	}

 	info->phy_ops = phy_ops;
 	info->phy_id = phy_id;
 	info->state = PN544_ST_COLD;
 	mutex_init(&info->info_lock);

 	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;

 	se = NFC_SE_UICC | NFC_SE_EMBEDDED;

 	info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data, 0,
 					     protocols, se, llc_name,
 					     phy_headroom + PN544_CMDS_HEADROOM,
 					     phy_tailroom, phy_payload);
 	if (!info->hdev) {
 		pr_err("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;

 	*hdev = info->hdev;

 	return 0;

 err_regdev:
 	nfc_hci_free_device(info->hdev);

 err_alloc_hdev:
 	kfree(info);

 err_info_alloc:
 	return r;
 }
 EXPORT_SYMBOL(pn544_hci_probe);

 void pn544_hci_remove(struct nfc_hci_dev *hdev)
 {
 	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

 	nfc_hci_unregister_device(hdev);
 	nfc_hci_free_device(hdev);
 	kfree(info);
 }
 EXPORT_SYMBOL(pn544_hci_remove);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION(DRIVER_DESC);
	/*
	* 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/delay.h>
	#include <linux/slab.h>
	#include <linux/module.h>

	#include <linux/nfc.h>
	#include <net/nfc/hci.h>
	#include <net/nfc/llc.h>

	#include "pn544.h"

	/* Timing restrictions (ms) */
	#define PN544_HCI_RESETVEN_TIME 30

	#define HCI_MODE 0
	#define FW_MODE 1

	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

	struct pn544_hci_info {
	struct nfc_phy_ops *phy_ops;
	void *phy_id;

	struct nfc_hci_dev *hdev;

	enum pn544_state state;

	struct mutex info_lock;

	int async_cb_type;
	data_exchange_cb_t async_cb;
	void *async_cb_context;
	};

	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 = info->phy_ops->enable(info->phy_id);

	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;

	info->phy_ops->disable(info->phy_id);

	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 int pn544_hci_xmit(struct nfc_hci_dev hdev, struct sk_buff skb)
	{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

	return info->phy_ops->write(info->phy_id, skb);
	}

	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)
	{
	int r;

	/* Set default false for multiple information chaining */
	*skb_push(skb, 1) = 0;

	r = nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
	PN544_HCI_EVT_SND_DATA, skb->data, skb->len);

	kfree_skb(skb);

	return r;
	}

	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;
	}

	/*
	* Returns:
	* <= 0: driver handled the event, skb consumed
	* 1: driver does not handle the event, please do standard processing
	*/
	static int 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;

	pr_debug("hci event %d", event);
	switch (event) {
	case PN544_HCI_EVT_ACTIVATED:
	if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE) {
	r = 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;

	r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
	NFC_COMM_PASSIVE, rgb_skb->data,
	rgb_skb->len);

	kfree_skb(rgb_skb);
	} else {
	r = -EINVAL;
	}
	break;
	case PN544_HCI_EVT_DEACTIVATED:
	r = 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);
	return nfc_tm_data_received(hdev->ndev, skb);
	default:
	return 1;
	}

	exit:
	kfree_skb(skb);

	return r;
	}

	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,
	};

	int pn544_hci_probe(void phy_id, struct nfc_phy_ops phy_ops, char *llc_name,
	int phy_headroom, int phy_tailroom, int phy_payload,
	struct nfc_hci_dev **hdev)
	{
	struct pn544_hci_info *info;
	u32 protocols, se;
	struct nfc_hci_init_data init_data;
	int r;

	info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
	if (!info) {
	pr_err("Cannot allocate memory for pn544_hci_info.\n");
	r = -ENOMEM;
	goto err_info_alloc;
	}

	info->phy_ops = phy_ops;
	info->phy_id = phy_id;
	info->state = PN544_ST_COLD;
	mutex_init(&info->info_lock);

	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;

	se = NFC_SE_UICC \| NFC_SE_EMBEDDED;

	info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data, 0,
	protocols, se, llc_name,
	phy_headroom + PN544_CMDS_HEADROOM,
	phy_tailroom, phy_payload);
	if (!info->hdev) {
	pr_err("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;

	*hdev = info->hdev;

	return 0;

	err_regdev:
	nfc_hci_free_device(info->hdev);

	err_alloc_hdev:
	kfree(info);

	err_info_alloc:
	return r;
	}
	EXPORT_SYMBOL(pn544_hci_probe);

	void pn544_hci_remove(struct nfc_hci_dev *hdev)
	{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

	nfc_hci_unregister_device(hdev);
	nfc_hci_free_device(hdev);
	kfree(info);
	}
	EXPORT_SYMBOL(pn544_hci_remove);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION(DRIVER_DESC);