Date:	Thu,  7 May 2015 15:54:04 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [char-misc-next 07/11] NFC: mei_phy: move all nfc logic from mei driver to nfc

move nfc logic to mei_phy module, we prefer as much as
possible not to deal with a particualr client protocol
in the mei generic infrasutcutre

Cc: Samuel Ortiz <sameo@...ux.intel.com> (supporter:NFC SUBSYSTEM)
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/bus.c     |  36 +-----
 drivers/misc/mei/mei_dev.h |   7 +-
 drivers/misc/mei/nfc.c     | 175 +--------------------------
 drivers/nfc/mei_phy.c      | 293 ++++++++++++++++++++++++++++++++++++++++-----
 drivers/nfc/mei_phy.h      |  35 ++++--
 5 files changed, 304 insertions(+), 242 deletions(-)

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index e76d94aa6e12..de8fd089a8a4 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -220,8 +220,7 @@ struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev,
 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
 					struct mei_me_client *me_cl,
 					struct mei_cl *cl,
-					char *name,
-					struct mei_cl_ops *ops)
+					char *name)
 {
 	struct mei_cl_device *device;
 	int status;
@@ -235,9 +234,8 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
 		kfree(device);
 		return NULL;
 	}
-	device->cl = cl;
-	device->ops = ops;
 
+	device->cl = cl;
 	device->dev.parent = dev->dev;
 	device->dev.bus = &mei_cl_bus_type;
 	device->dev.type = &mei_cl_device_type;
@@ -294,7 +292,7 @@ void mei_cl_driver_unregister(struct mei_cl_driver *driver)
 }
 EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
 
-static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 			bool blocking)
 {
 	struct mei_device *dev;
@@ -408,16 +406,6 @@ out:
 	return rets;
 }
 
-inline ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
-{
-	return ___mei_cl_send(cl, buf, length, 0);
-}
-
-inline ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
-{
-	return ___mei_cl_send(cl, buf, length, 1);
-}
-
 ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
 {
 	struct mei_cl *cl = device->cl;
@@ -425,23 +413,17 @@ ssize_t mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
 	if (cl == NULL)
 		return -ENODEV;
 
-	if (device->ops && device->ops->send)
-		return device->ops->send(device, buf, length);
-
-	return __mei_cl_send(cl, buf, length);
+	return __mei_cl_send(cl, buf, length, 1);
 }
 EXPORT_SYMBOL_GPL(mei_cl_send);
 
 ssize_t mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
 {
-	struct mei_cl *cl =  device->cl;
+	struct mei_cl *cl = device->cl;
 
 	if (cl == NULL)
 		return -ENODEV;
 
-	if (device->ops && device->ops->recv)
-		return device->ops->recv(device, buf, length);
-
 	return __mei_cl_recv(cl, buf, length);
 }
 EXPORT_SYMBOL_GPL(mei_cl_recv);
@@ -522,10 +504,7 @@ int mei_cl_enable_device(struct mei_cl_device *device)
 	if (device->event_cb)
 		mei_cl_read_start(device->cl, 0, NULL);
 
-	if (!device->ops || !device->ops->enable)
-		return 0;
-
-	return device->ops->enable(device);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(mei_cl_enable_device);
 
@@ -540,9 +519,6 @@ int mei_cl_disable_device(struct mei_cl_device *device)
 
 	dev = cl->dev;
 
-	if (device->ops && device->ops->disable)
-		device->ops->disable(device);
-
 	device->event_cb = NULL;
 
 	mutex_lock(&dev->device_lock);
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index ab719e674edf..2175bff2730f 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -352,12 +352,11 @@ struct mei_cl_ops {
 struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
 					struct mei_me_client *me_cl,
 					struct mei_cl *cl,
-					char *name,
-					struct mei_cl_ops *ops);
+					char *name);
 void mei_cl_remove_device(struct mei_cl_device *device);
 
-ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
-ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
+ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+			bool blocking);
 ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
 void mei_cl_bus_rx_event(struct mei_cl *cl);
 void mei_cl_bus_remove_devices(struct mei_device *dev);
diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c
index e2a6ba0236c8..b983c4ecad38 100644
--- a/drivers/misc/mei/nfc.c
+++ b/drivers/misc/mei/nfc.c
@@ -95,28 +95,21 @@ struct mei_nfc_hci_hdr {
  * @cl: NFC host client
  * @cl_info: NFC info host client
  * @init_work: perform connection to the info client
- * @send_wq: send completion wait queue
  * @fw_ivn: NFC Interface Version Number
  * @vendor_id: NFC manufacturer ID
  * @radio_type: NFC radio type
  * @bus_name: bus name
  *
- * @req_id:  message counter
- * @recv_req_id: reception message counter
  */
 struct mei_nfc_dev {
 	struct mei_me_client *me_cl;
 	struct mei_cl *cl;
 	struct mei_cl *cl_info;
 	struct work_struct init_work;
-	wait_queue_head_t send_wq;
 	u8 fw_ivn;
 	u8 vendor_id;
 	u8 radio_type;
 	char *bus_name;
-
-	u16 req_id;
-	u16 recv_req_id;
 };
 
 /* UUIDs for NFC F/W clients */
@@ -202,73 +195,6 @@ static int mei_nfc_build_bus_name(struct mei_nfc_dev *ndev)
 	return 0;
 }
 
-static int mei_nfc_connect(struct mei_nfc_dev *ndev)
-{
-	struct mei_device *dev;
-	struct mei_cl *cl;
-	struct mei_nfc_cmd *cmd, *reply;
-	struct mei_nfc_connect *connect;
-	struct mei_nfc_connect_resp *connect_resp;
-	size_t connect_length, connect_resp_length;
-	int bytes_recv, ret;
-
-	cl = ndev->cl;
-	dev = cl->dev;
-
-	connect_length = sizeof(struct mei_nfc_cmd) +
-			sizeof(struct mei_nfc_connect);
-
-	connect_resp_length = sizeof(struct mei_nfc_cmd) +
-			sizeof(struct mei_nfc_connect_resp);
-
-	cmd = kzalloc(connect_length, GFP_KERNEL);
-	if (!cmd)
-		return -ENOMEM;
-	connect = (struct mei_nfc_connect *)cmd->data;
-
-	reply = kzalloc(connect_resp_length, GFP_KERNEL);
-	if (!reply) {
-		kfree(cmd);
-		return -ENOMEM;
-	}
-
-	connect_resp = (struct mei_nfc_connect_resp *)reply->data;
-
-	cmd->command = MEI_NFC_CMD_MAINTENANCE;
-	cmd->data_size = 3;
-	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
-	connect->fw_ivn = ndev->fw_ivn;
-	connect->vendor_id = ndev->vendor_id;
-
-	ret = __mei_cl_send(cl, (u8 *)cmd, connect_length);
-	if (ret < 0) {
-		dev_err(dev->dev, "Could not send connect cmd\n");
-		goto err;
-	}
-
-	bytes_recv = __mei_cl_recv(cl, (u8 *)reply, connect_resp_length);
-	if (bytes_recv < 0) {
-		dev_err(dev->dev, "Could not read connect response\n");
-		ret = bytes_recv;
-		goto err;
-	}
-
-	dev_info(dev->dev, "IVN 0x%x Vendor ID 0x%x\n",
-		 connect_resp->fw_ivn, connect_resp->vendor_id);
-
-	dev_info(dev->dev, "ME FW %d.%d.%d.%d\n",
-		connect_resp->me_major, connect_resp->me_minor,
-		connect_resp->me_hotfix, connect_resp->me_build);
-
-	ret = 0;
-
-err:
-	kfree(reply);
-	kfree(cmd);
-
-	return ret;
-}
-
 static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
 {
 	struct mei_device *dev;
@@ -288,7 +214,7 @@ static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
 	cmd.data_size = 1;
 	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
 
-	ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
+	ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd), 1);
 	if (ret < 0) {
 		dev_err(dev->dev, "Could not send IF version cmd\n");
 		return ret;
@@ -320,100 +246,6 @@ err:
 	return ret;
 }
 
-static int mei_nfc_enable(struct mei_cl_device *cldev)
-{
-	struct mei_device *dev;
-	struct mei_nfc_dev *ndev;
-	int ret;
-
-	ndev = (struct mei_nfc_dev *)cldev->priv_data;
-	dev = ndev->cl->dev;
-
-	ret = mei_nfc_connect(ndev);
-	if (ret < 0) {
-		dev_err(dev->dev, "Could not connect to NFC");
-		return ret;
-	}
-
-	return 0;
-}
-
-static int mei_nfc_disable(struct mei_cl_device *cldev)
-{
-	return 0;
-}
-
-static int mei_nfc_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
-{
-	struct mei_device *dev;
-	struct mei_nfc_dev *ndev;
-	struct mei_nfc_hci_hdr *hdr;
-	u8 *mei_buf;
-	int err;
-
-	ndev = (struct mei_nfc_dev *) cldev->priv_data;
-	dev = ndev->cl->dev;
-
-	err = -ENOMEM;
-	mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
-	if (!mei_buf)
-		goto out;
-
-	hdr = (struct mei_nfc_hci_hdr *) mei_buf;
-	hdr->cmd = MEI_NFC_CMD_HCI_SEND;
-	hdr->status = 0;
-	hdr->req_id = ndev->req_id;
-	hdr->reserved = 0;
-	hdr->data_size = length;
-
-	memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
-	err = __mei_cl_send(ndev->cl, mei_buf, length + MEI_NFC_HEADER_SIZE);
-	if (err < 0)
-		goto out;
-
-	if (!wait_event_interruptible_timeout(ndev->send_wq,
-				ndev->recv_req_id == ndev->req_id, HZ)) {
-		dev_err(dev->dev, "NFC MEI command timeout\n");
-		err = -ETIME;
-	} else {
-		ndev->req_id++;
-	}
-out:
-	kfree(mei_buf);
-	return err;
-}
-
-static int mei_nfc_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
-{
-	struct mei_nfc_dev *ndev;
-	struct mei_nfc_hci_hdr *hci_hdr;
-	int received_length;
-
-	ndev = (struct mei_nfc_dev *)cldev->priv_data;
-
-	received_length = __mei_cl_recv(ndev->cl, buf, length);
-	if (received_length < 0)
-		return received_length;
-
-	hci_hdr = (struct mei_nfc_hci_hdr *) buf;
-
-	if (hci_hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
-		ndev->recv_req_id = hci_hdr->req_id;
-		wake_up(&ndev->send_wq);
-
-		return 0;
-	}
-
-	return received_length;
-}
-
-static struct mei_cl_ops nfc_ops = {
-	.enable = mei_nfc_enable,
-	.disable = mei_nfc_disable,
-	.send = mei_nfc_send,
-	.recv = mei_nfc_recv,
-};
-
 static void mei_nfc_init(struct work_struct *work)
 {
 	struct mei_device *dev;
@@ -473,7 +305,7 @@ static void mei_nfc_init(struct work_struct *work)
 	}
 
 	cldev = mei_cl_add_device(dev, ndev->me_cl, ndev->cl,
-				  ndev->bus_name, &nfc_ops);
+				  ndev->bus_name);
 	if (!cldev) {
 		dev_err(dev->dev, "Could not add the NFC device to the MEI bus\n");
 
@@ -539,10 +371,7 @@ int mei_nfc_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
 
 	ndev->cl = cl;
 
-	ndev->req_id = 1;
-
 	INIT_WORK(&ndev->init_work, mei_nfc_init);
-	init_waitqueue_head(&ndev->send_wq);
 	schedule_work(&ndev->init_work);
 
 	return 0;
diff --git a/drivers/nfc/mei_phy.c b/drivers/nfc/mei_phy.c
index 11c7cbdade66..7f1495d649bb 100644
--- a/drivers/nfc/mei_phy.c
+++ b/drivers/nfc/mei_phy.c
@@ -24,7 +24,52 @@
 
 #include "mei_phy.h"
 
-struct mei_nfc_hdr {
+struct mei_nfc_cmd {
+	u8 command;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+	u8 sub_command;
+	u8 data[];
+} __packed;
+
+struct mei_nfc_reply {
+	u8 command;
+	u8 status;
+	u16 req_id;
+	u32 reserved;
+	u16 data_size;
+	u8 sub_command;
+	u8 reply_status;
+	u8 data[];
+} __packed;
+
+struct mei_nfc_if_version {
+	u8 radio_version_sw[3];
+	u8 reserved[3];
+	u8 radio_version_hw[3];
+	u8 i2c_addr;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+} __packed;
+
+struct mei_nfc_connect {
+	u8 fw_ivn;
+	u8 vendor_id;
+} __packed;
+
+struct mei_nfc_connect_resp {
+	u8 fw_ivn;
+	u8 vendor_id;
+	u16 me_major;
+	u16 me_minor;
+	u16 me_hotfix;
+	u16 me_build;
+} __packed;
+
+struct mei_nfc_hci_hdr {
 	u8 cmd;
 	u8 status;
 	u16 req_id;
@@ -32,6 +77,16 @@ struct mei_nfc_hdr {
 	u16 data_size;
 } __packed;
 
+#define MEI_NFC_CMD_MAINTENANCE 0x00
+#define MEI_NFC_CMD_HCI_SEND 0x01
+#define MEI_NFC_CMD_HCI_RECV 0x02
+
+#define MEI_NFC_SUBCMD_CONNECT    0x00
+#define MEI_NFC_SUBCMD_IF_VERSION 0x01
+
+#define MEI_NFC_HEADER_SIZE 10
+
+
 #define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
 
 #define MEI_DUMP_SKB_IN(info, skb)				\
@@ -45,51 +100,156 @@ do {								\
 do {								\
 	pr_debug("%s:\n", info);				\
 	print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET,	\
-		       16, 1, (skb)->data, (skb)->len, false);	\
+			16, 1, (skb)->data, (skb)->len, false);	\
 } while (0)
 
-int nfc_mei_phy_enable(void *phy_id)
+
+static int mei_nfc_if_version(struct nfc_mei_phy *phy)
 {
-	int r;
-	struct nfc_mei_phy *phy = phy_id;
+
+	struct mei_nfc_cmd cmd;
+	struct mei_nfc_reply *reply = NULL;
+	struct mei_nfc_if_version *version;
+	size_t if_version_length;
+	int bytes_recv, r;
 
 	pr_info("%s\n", __func__);
 
-	if (phy->powered == 1)
-		return 0;
+	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
+	cmd.command = MEI_NFC_CMD_MAINTENANCE;
+	cmd.data_size = 1;
+	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
 
-	r = mei_cl_enable_device(phy->device);
+	r = mei_cl_send(phy->device, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
 	if (r < 0) {
-		pr_err("Could not enable device\n");
+		pr_err("Could not send IF version cmd\n");
 		return r;
 	}
 
-	r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
-	if (r) {
-		pr_err("Event cb registration failed\n");
-		mei_cl_disable_device(phy->device);
-		phy->powered = 0;
+	/* to be sure on the stack we alloc memory */
+	if_version_length = sizeof(struct mei_nfc_reply) +
+		sizeof(struct mei_nfc_if_version);
 
-		return r;
+	reply = kzalloc(if_version_length, GFP_KERNEL);
+	if (!reply)
+		return -ENOMEM;
+
+	bytes_recv = mei_cl_recv(phy->device, (u8 *)reply, if_version_length);
+	if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
+		pr_err("Could not read IF version\n");
+		r = -EIO;
+		goto err;
 	}
 
-	phy->powered = 1;
+	version = (struct mei_nfc_if_version *)reply->data;
 
-	return 0;
+	phy->fw_ivn = version->fw_ivn;
+	phy->vendor_id = version->vendor_id;
+	phy->radio_type = version->radio_type;
+
+err:
+	kfree(reply);
+	return r;
 }
-EXPORT_SYMBOL_GPL(nfc_mei_phy_enable);
 
-void nfc_mei_phy_disable(void *phy_id)
+static int mei_nfc_connect(struct nfc_mei_phy *phy)
 {
-	struct nfc_mei_phy *phy = phy_id;
+	struct mei_nfc_cmd *cmd, *reply;
+	struct mei_nfc_connect *connect;
+	struct mei_nfc_connect_resp *connect_resp;
+	size_t connect_length, connect_resp_length;
+	int bytes_recv, r;
 
 	pr_info("%s\n", __func__);
 
-	mei_cl_disable_device(phy->device);
+	connect_length = sizeof(struct mei_nfc_cmd) +
+			sizeof(struct mei_nfc_connect);
 
-	phy->powered = 0;
+	connect_resp_length = sizeof(struct mei_nfc_cmd) +
+			sizeof(struct mei_nfc_connect_resp);
+
+	cmd = kzalloc(connect_length, GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+	connect = (struct mei_nfc_connect *)cmd->data;
+
+	reply = kzalloc(connect_resp_length, GFP_KERNEL);
+	if (!reply) {
+		kfree(cmd);
+		return -ENOMEM;
+	}
+
+	connect_resp = (struct mei_nfc_connect_resp *)reply->data;
+
+	cmd->command = MEI_NFC_CMD_MAINTENANCE;
+	cmd->data_size = 3;
+	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
+	connect->fw_ivn = phy->fw_ivn;
+	connect->vendor_id = phy->vendor_id;
+
+	r = mei_cl_send(phy->device, (u8 *)cmd, connect_length);
+	if (r < 0) {
+		pr_err("Could not send connect cmd %d\n", r);
+		goto err;
+	}
+
+	bytes_recv = mei_cl_recv(phy->device, (u8 *)reply, connect_resp_length);
+	if (bytes_recv < 0) {
+		r = bytes_recv;
+		pr_err("Could not read connect response %d\n", r);
+		goto err;
+	}
+
+	pr_info("IVN 0x%x Vendor ID 0x%x\n",
+		 connect_resp->fw_ivn, connect_resp->vendor_id);
+
+	pr_info("ME FW %d.%d.%d.%d\n",
+		connect_resp->me_major, connect_resp->me_minor,
+		connect_resp->me_hotfix, connect_resp->me_build);
+
+	r = 0;
+
+err:
+	kfree(reply);
+	kfree(cmd);
+
+	return r;
+}
+
+static int mei_nfc_send(struct nfc_mei_phy *phy, u8 *buf, size_t length)
+{
+	struct mei_nfc_hci_hdr *hdr;
+	u8 *mei_buf;
+	int err;
+
+	err = -ENOMEM;
+	mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
+	if (!mei_buf)
+		goto out;
+
+	hdr = (struct mei_nfc_hci_hdr *) mei_buf;
+	hdr->cmd = MEI_NFC_CMD_HCI_SEND;
+	hdr->status = 0;
+	hdr->req_id = phy->req_id;
+	hdr->reserved = 0;
+	hdr->data_size = length;
+
+	memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
+	err = mei_cl_send(phy->device, mei_buf, length + MEI_NFC_HEADER_SIZE);
+	if (err < 0)
+		goto out;
+
+	if (!wait_event_interruptible_timeout(phy->send_wq,
+				phy->recv_req_id == phy->req_id, HZ)) {
+		pr_err("NFC MEI command timeout\n");
+		err = -ETIME;
+	} else {
+		phy->req_id++;
+	}
+out:
+	kfree(mei_buf);
+	return err;
 }
-EXPORT_SYMBOL_GPL(nfc_mei_phy_disable);
 
 /*
  * Writing a frame must not return the number of written bytes.
@@ -103,14 +263,37 @@ static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
 
 	MEI_DUMP_SKB_OUT("mei frame sent", skb);
 
-	r = mei_cl_send(phy->device, skb->data, skb->len);
+	r = mei_nfc_send(phy, skb->data, skb->len);
 	if (r > 0)
 		r = 0;
 
 	return r;
 }
 
-void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
+static int mei_nfc_recv(struct nfc_mei_phy *phy, u8 *buf, size_t length)
+{
+	struct mei_nfc_hci_hdr *hci_hdr;
+	int received_length;
+
+	received_length = mei_cl_recv(phy->device, buf, length);
+	if (received_length < 0)
+		return received_length;
+
+	hci_hdr = (struct mei_nfc_hci_hdr *) buf;
+
+	if (hci_hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
+		phy->recv_req_id = hci_hdr->req_id;
+		wake_up(&phy->send_wq);
+
+		return 0;
+	}
+
+	return received_length;
+}
+
+
+static void nfc_mei_event_cb(struct mei_cl_device *device, u32 events,
+			     void *context)
 {
 	struct nfc_mei_phy *phy = context;
 
@@ -125,7 +308,7 @@ void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
 		if (!skb)
 			return;
 
-		reply_size = mei_cl_recv(device, skb->data, MEI_NFC_MAX_READ);
+		reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
 		if (reply_size < MEI_NFC_HEADER_SIZE) {
 			kfree_skb(skb);
 			return;
@@ -139,7 +322,61 @@ void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
 		nfc_hci_recv_frame(phy->hdev, skb);
 	}
 }
-EXPORT_SYMBOL_GPL(nfc_mei_event_cb);
+
+static int nfc_mei_phy_enable(void *phy_id)
+{
+	int r;
+	struct nfc_mei_phy *phy = phy_id;
+
+	pr_info("%s\n", __func__);
+
+	if (phy->powered == 1)
+		return 0;
+
+	r = mei_cl_enable_device(phy->device);
+	if (r < 0) {
+		pr_err("Could not enable device %d\n", r);
+		return r;
+	}
+
+	r = mei_nfc_if_version(phy);
+	if (r < 0) {
+		pr_err("Could not enable device %d\n", r);
+		goto err;
+	}
+
+	r = mei_nfc_connect(phy);
+	if (r < 0) {
+		pr_err("Could not connect to device %d\n", r);
+		goto err;
+	}
+
+	r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
+	if (r) {
+		pr_err("Event cb registration failed %d\n", r);
+		goto err;
+	}
+
+	phy->powered = 1;
+
+	return 0;
+
+err:
+	phy->powered = 0;
+	mei_cl_disable_device(phy->device);
+	return r;
+}
+
+static void nfc_mei_phy_disable(void *phy_id)
+{
+	struct nfc_mei_phy *phy = phy_id;
+
+	pr_info("%s\n", __func__);
+
+	mei_cl_disable_device(phy->device);
+
+	phy->powered = 0;
+}
 
 struct nfc_phy_ops mei_phy_ops = {
 	.write = nfc_mei_phy_write,
@@ -157,6 +394,7 @@ struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device)
 		return NULL;
 
 	phy->device = device;
+	init_waitqueue_head(&phy->send_wq);
 	mei_cl_set_drvdata(device, phy);
 
 	return phy;
@@ -165,6 +403,7 @@ EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
 
 void nfc_mei_phy_free(struct nfc_mei_phy *phy)
 {
+	mei_cl_disable_device(phy->device);
 	kfree(phy);
 }
 EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
diff --git a/drivers/nfc/mei_phy.h b/drivers/nfc/mei_phy.h
index 06608c28ff14..a51f8f2685cc 100644
--- a/drivers/nfc/mei_phy.h
+++ b/drivers/nfc/mei_phy.h
@@ -10,23 +10,42 @@
 #define MEI_NFC_HEADER_SIZE 10
 #define MEI_NFC_MAX_HCI_PAYLOAD 300
 
+/**
+ * struct nfc_mei_phy
+ *
+ * @device: mei device
+ * @hdev:   nfc hci device
+
+ * @send_wq: send completion wait queue
+ * @fw_ivn: NFC Interface Version Number
+ * @vendor_id: NFC manufacturer ID
+ * @radio_type: NFC radio type
+ * @reserved: reserved for alignment
+ * @req_id:  message counter
+ * @recv_req_id: reception message counter
+ * @powered: the device is in powered state
+ * @hard_fault: < 0 if hardware error occurred
+ *    and prevents normal operation.
+ */
 struct nfc_mei_phy {
 	struct mei_cl_device *device;
 	struct nfc_hci_dev *hdev;
 
-	int powered;
+	wait_queue_head_t send_wq;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+	u8 reserved;
+
+	u16 req_id;
+	u16 recv_req_id;
 
-	int hard_fault;		/*
-				 * < 0 if hardware error occured
-				 * and prevents normal operation.
-				 */
+	int powered;
+	int hard_fault;
 };
 
 extern struct nfc_phy_ops mei_phy_ops;
 
-int nfc_mei_phy_enable(void *phy_id);
-void nfc_mei_phy_disable(void *phy_id);
-void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context);
 struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device);
 void nfc_mei_phy_free(struct nfc_mei_phy *phy);
 
-- 
2.1.0

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