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

 /*
  * MEI Library for mei bus nfc device access
  *
  * Copyright (C) 2013  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, see <http://www.gnu.org/licenses/>.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/nfc.h>

 #include "mei_phy.h"

 struct mei_nfc_hdr {
 	u8 cmd;
 	u8 status;
 	u16 req_id;
 	u32 reserved;
 	u16 data_size;
 } __packed;

 struct mei_nfc_cmd {
 	struct mei_nfc_hdr hdr;
 	u8 sub_command;
 	u8 data[];
 } __packed;

 struct mei_nfc_reply {
 	struct mei_nfc_hdr hdr;
 	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;


 #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_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)

 #define MEI_DUMP_SKB_IN(info, skb)				\
 do {								\
 	pr_debug("%s:\n", info);				\
 	print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET,	\
 			16, 1, (skb)->data, (skb)->len, false);	\
 } while (0)

 #define MEI_DUMP_SKB_OUT(info, skb)				\
 do {								\
 	pr_debug("%s:\n", info);				\
 	print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET,	\
 			16, 1, (skb)->data, (skb)->len, false);	\
 } while (0)

 #define MEI_DUMP_NFC_HDR(info, _hdr)                                \
 do {                                                                \
 	pr_debug("%s:\n", info);                                    \
 	pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n",  \
 		 (_hdr)->cmd, (_hdr)->status, (_hdr)->req_id,       \
 		 (_hdr)->reserved, (_hdr)->data_size);              \
 } while (0)

 static int mei_nfc_if_version(struct nfc_mei_phy *phy)
 {

 	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__);

 	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
 	cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
 	cmd.hdr.data_size = 1;
 	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;

 	MEI_DUMP_NFC_HDR("version", &cmd.hdr);
 	r = mei_cl_send(phy->device, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
 	if (r < 0) {
 		pr_err("Could not send IF version cmd\n");
 		return r;
 	}

 	/* to be sure on the stack we alloc memory */
 	if_version_length = sizeof(struct mei_nfc_reply) +
 		sizeof(struct mei_nfc_if_version);

 	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;
 	}

 	version = (struct mei_nfc_if_version *)reply->data;

 	phy->fw_ivn = version->fw_ivn;
 	phy->vendor_id = version->vendor_id;
 	phy->radio_type = version->radio_type;

 err:
 	kfree(reply);
 	return r;
 }

 static int mei_nfc_connect(struct nfc_mei_phy *phy)
 {
 	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__);

 	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->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
 	cmd->hdr.data_size = 3;
 	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
 	connect->fw_ivn = phy->fw_ivn;
 	connect->vendor_id = phy->vendor_id;

 	MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
 	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;
 	}

 	MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);

 	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_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_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;

 	MEI_DUMP_NFC_HDR("send", hdr);

 	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;
 }

 /*
  * Writing a frame must not return the number of written bytes.
  * It must return either zero for success, or <0 for error.
  * In addition, it must not alter the skb
  */
 static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
 {
 	struct nfc_mei_phy *phy = phy_id;
 	int r;

 	MEI_DUMP_SKB_OUT("mei frame sent", skb);

 	r = mei_nfc_send(phy, skb->data, skb->len);
 	if (r > 0)
 		r = 0;

 	return r;
 }

 static int mei_nfc_recv(struct nfc_mei_phy *phy, u8 *buf, size_t length)
 {
 	struct mei_nfc_hdr *hdr;
 	int received_length;

 	received_length = mei_cl_recv(phy->device, buf, length);
 	if (received_length < 0)
 		return received_length;

 	hdr = (struct mei_nfc_hdr *) buf;

 	MEI_DUMP_NFC_HDR("receive", hdr);
 	if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
 		phy->recv_req_id = 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;

 	if (phy->hard_fault != 0)
 		return;

 	if (events & BIT(MEI_CL_EVENT_RX)) {
 		struct sk_buff *skb;
 		int reply_size;

 		skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
 		if (!skb)
 			return;

 		reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
 		if (reply_size < MEI_NFC_HEADER_SIZE) {
 			kfree_skb(skb);
 			return;
 		}

 		skb_put(skb, reply_size);
 		skb_pull(skb, MEI_NFC_HEADER_SIZE);

 		MEI_DUMP_SKB_IN("mei frame read", skb);

 		nfc_hci_recv_frame(phy->hdev, skb);
 	}
 }

 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, BIT(MEI_CL_EVENT_RX),
 				     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,
 	.enable = nfc_mei_phy_enable,
 	.disable = nfc_mei_phy_disable,
 };
 EXPORT_SYMBOL_GPL(mei_phy_ops);

 struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device)
 {
 	struct nfc_mei_phy *phy;

 	phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
 	if (!phy)
 		return NULL;

 	phy->device = device;
 	init_waitqueue_head(&phy->send_wq);
 	mei_cl_set_drvdata(device, phy);

 	return phy;
 }
 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);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("mei bus NFC device interface");
	/*
	* MEI Library for mei bus nfc device access
	*
	* Copyright (C) 2013 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, see <http://www.gnu.org/licenses/>.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/nfc.h>

	#include "mei_phy.h"

	struct mei_nfc_hdr {
	u8 cmd;
	u8 status;
	u16 req_id;
	u32 reserved;
	u16 data_size;
	} __packed;

	struct mei_nfc_cmd {
	struct mei_nfc_hdr hdr;
	u8 sub_command;
	u8 data[];
	} __packed;

	struct mei_nfc_reply {
	struct mei_nfc_hdr hdr;
	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;


	#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_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)

	#define MEI_DUMP_SKB_IN(info, skb) \
	do { \
	pr_debug("%s:\n", info); \
	print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
	16, 1, (skb)->data, (skb)->len, false); \
	} while (0)

	#define MEI_DUMP_SKB_OUT(info, skb) \
	do { \
	pr_debug("%s:\n", info); \
	print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
	16, 1, (skb)->data, (skb)->len, false); \
	} while (0)

	#define MEI_DUMP_NFC_HDR(info, _hdr) \
	do { \
	pr_debug("%s:\n", info); \
	pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n", \
	(_hdr)->cmd, (_hdr)->status, (_hdr)->req_id, \
	(_hdr)->reserved, (_hdr)->data_size); \
	} while (0)

	static int mei_nfc_if_version(struct nfc_mei_phy *phy)
	{

	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__);

	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
	cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
	cmd.hdr.data_size = 1;
	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;

	MEI_DUMP_NFC_HDR("version", &cmd.hdr);
	r = mei_cl_send(phy->device, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
	if (r < 0) {
	pr_err("Could not send IF version cmd\n");
	return r;
	}

	/* to be sure on the stack we alloc memory */
	if_version_length = sizeof(struct mei_nfc_reply) +
	sizeof(struct mei_nfc_if_version);

	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;
	}

	version = (struct mei_nfc_if_version *)reply->data;

	phy->fw_ivn = version->fw_ivn;
	phy->vendor_id = version->vendor_id;
	phy->radio_type = version->radio_type;

	err:
	kfree(reply);
	return r;
	}

	static int mei_nfc_connect(struct nfc_mei_phy *phy)
	{
	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__);

	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->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
	cmd->hdr.data_size = 3;
	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
	connect->fw_ivn = phy->fw_ivn;
	connect->vendor_id = phy->vendor_id;

	MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
	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;
	}

	MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);

	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_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_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;

	MEI_DUMP_NFC_HDR("send", hdr);

	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;
	}

	/*
	* Writing a frame must not return the number of written bytes.
	* It must return either zero for success, or <0 for error.
	* In addition, it must not alter the skb
	*/
	static int nfc_mei_phy_write(void phy_id, struct sk_buff skb)
	{
	struct nfc_mei_phy *phy = phy_id;
	int r;

	MEI_DUMP_SKB_OUT("mei frame sent", skb);

	r = mei_nfc_send(phy, skb->data, skb->len);
	if (r > 0)
	r = 0;

	return r;
	}

	static int mei_nfc_recv(struct nfc_mei_phy phy, u8 buf, size_t length)
	{
	struct mei_nfc_hdr *hdr;
	int received_length;

	received_length = mei_cl_recv(phy->device, buf, length);
	if (received_length < 0)
	return received_length;

	hdr = (struct mei_nfc_hdr *) buf;

	MEI_DUMP_NFC_HDR("receive", hdr);
	if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
	phy->recv_req_id = 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;

	if (phy->hard_fault != 0)
	return;

	if (events & BIT(MEI_CL_EVENT_RX)) {
	struct sk_buff *skb;
	int reply_size;

	skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
	if (!skb)
	return;

	reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
	if (reply_size < MEI_NFC_HEADER_SIZE) {
	kfree_skb(skb);
	return;
	}

	skb_put(skb, reply_size);
	skb_pull(skb, MEI_NFC_HEADER_SIZE);

	MEI_DUMP_SKB_IN("mei frame read", skb);

	nfc_hci_recv_frame(phy->hdev, skb);
	}
	}

	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, BIT(MEI_CL_EVENT_RX),
	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,
	.enable = nfc_mei_phy_enable,
	.disable = nfc_mei_phy_disable,
	};
	EXPORT_SYMBOL_GPL(mei_phy_ops);

	struct nfc_mei_phy nfc_mei_phy_alloc(struct mei_cl_device device)
	{
	struct nfc_mei_phy *phy;

	phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
	if (!phy)
	return NULL;

	phy->device = device;
	init_waitqueue_head(&phy->send_wq);
	mei_cl_set_drvdata(device, phy);

	return phy;
	}
	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);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("mei bus NFC device interface");