[mirror_ubuntu-eoan-kernel.git] / drivers / nfc / mei_phy.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2013, Intel Corporation.
 *
 * MEI Library for mei bus nfc device access
 */
#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_cldev_send(phy->cldev, (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_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
	if (bytes_recv < 0 || bytes_recv < if_version_length) {
		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_cldev_send(phy->cldev, (u8 *)cmd, connect_length);
	if (r < 0) {
		pr_err("Could not send connect cmd %d\n", r);
		goto err;
	}

	bytes_recv = mei_cldev_recv(phy->cldev, (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_cldev_send(phy->cldev, 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_cldev_recv(phy->cldev, 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_rx_cb(struct mei_cl_device *cldev)
{
	struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
	struct sk_buff *skb;
	int reply_size;

	if (!phy)
		return;

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

	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_cldev_enable(phy->cldev);
	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_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb);
	if (r) {
		pr_err("Event cb registration failed %d\n", r);
		goto err;
	}

	phy->powered = 1;

	return 0;

err:
	phy->powered = 0;
	mei_cldev_disable(phy->cldev);
	return r;
}

static void nfc_mei_phy_disable(void *phy_id)
{
	struct nfc_mei_phy *phy = phy_id;

	pr_info("%s\n", __func__);

	mei_cldev_disable(phy->cldev);

	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 *cldev)
{
	struct nfc_mei_phy *phy;

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

	phy->cldev = cldev;
	init_waitqueue_head(&phy->send_wq);
	mei_cldev_set_drvdata(cldev, phy);

	return phy;
}
EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);

void nfc_mei_phy_free(struct nfc_mei_phy *phy)
{
	mei_cldev_disable(phy->cldev);
	kfree(phy);
}
EXPORT_SYMBOL_GPL(nfc_mei_phy_free);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("mei bus NFC device interface");
Commit	Line	Data
191b0700	1	// SPDX-License-Identifier: GPL-2.0
4912e2fe	2	/*
191b0700	3	* Copyright (c) 2013, Intel Corporation.
4912e2fe	4	*
191b0700	5	* MEI Library for mei bus nfc device access
4912e2fe	6	*/
17936b43 JP	7	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17936b43 JP	8
4912e2fe EL	9	#include <linux/module.h>
	10	#include <linux/slab.h>
	11	#include <linux/nfc.h>
	12
	13	#include "mei_phy.h"
	14
1d3ff767 TW	15	struct mei_nfc_hdr {
1d3ff767 TW	16	u8 cmd;
be9b720a TW	17	u8 status;
	18	u16 req_id;
	19	u32 reserved;
	20	u16 data_size;
1d3ff767 TW	21	} __packed;
	22
	23	struct mei_nfc_cmd {
	24	struct mei_nfc_hdr hdr;
be9b720a TW	25	u8 sub_command;
	26	u8 data[];
	27	} __packed;
	28
	29	struct mei_nfc_reply {
1d3ff767	30	struct mei_nfc_hdr hdr;
be9b720a TW	31	u8 sub_command;
	32	u8 reply_status;
	33	u8 data[];
	34	} __packed;
	35
	36	struct mei_nfc_if_version {
	37	u8 radio_version_sw[3];
	38	u8 reserved[3];
	39	u8 radio_version_hw[3];
	40	u8 i2c_addr;
	41	u8 fw_ivn;
	42	u8 vendor_id;
	43	u8 radio_type;
	44	} __packed;
	45
	46	struct mei_nfc_connect {
	47	u8 fw_ivn;
	48	u8 vendor_id;
	49	} __packed;
	50
	51	struct mei_nfc_connect_resp {
	52	u8 fw_ivn;
	53	u8 vendor_id;
	54	u16 me_major;
	55	u16 me_minor;
	56	u16 me_hotfix;
	57	u16 me_build;
	58	} __packed;
	59
4912e2fe	60
be9b720a TW	61	#define MEI_NFC_CMD_MAINTENANCE 0x00
	62	#define MEI_NFC_CMD_HCI_SEND 0x01
	63	#define MEI_NFC_CMD_HCI_RECV 0x02
	64
	65	#define MEI_NFC_SUBCMD_CONNECT 0x00
	66	#define MEI_NFC_SUBCMD_IF_VERSION 0x01
	67
4912e2fe EL	68	#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
	69
	70	#define MEI_DUMP_SKB_IN(info, skb) \
	71	do { \
	72	pr_debug("%s:\n", info); \
	73	print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
	74	16, 1, (skb)->data, (skb)->len, false); \
	75	} while (0)
	76
	77	#define MEI_DUMP_SKB_OUT(info, skb) \
	78	do { \
	79	pr_debug("%s:\n", info); \
	80	print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
be9b720a	81	16, 1, (skb)->data, (skb)->len, false); \
4912e2fe EL	82	} while (0)
4912e2fe EL	83
1d3ff767 TW	84	#define MEI_DUMP_NFC_HDR(info, _hdr) \
	85	do { \
	86	pr_debug("%s:\n", info); \
	87	pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n", \
	88	(_hdr)->cmd, (_hdr)->status, (_hdr)->req_id, \
	89	(_hdr)->reserved, (_hdr)->data_size); \
	90	} while (0)
be9b720a TW	91
be9b720a TW	92	static int mei_nfc_if_version(struct nfc_mei_phy *phy)
4912e2fe	93	{
be9b720a TW	94
	95	struct mei_nfc_cmd cmd;
	96	struct mei_nfc_reply *reply = NULL;
	97	struct mei_nfc_if_version *version;
	98	size_t if_version_length;
	99	int bytes_recv, r;
4912e2fe EL	100
	101	pr_info("%s\n", __func__);
	102
be9b720a	103	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
1d3ff767 TW	104	cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
1d3ff767 TW	105	cmd.hdr.data_size = 1;
be9b720a	106	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
4912e2fe	107
1d3ff767	108	MEI_DUMP_NFC_HDR("version", &cmd.hdr);
d49dc5e7	109	r = mei_cldev_send(phy->cldev, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
4912e2fe	110	if (r < 0) {
be9b720a	111	pr_err("Could not send IF version cmd\n");
bda7eb27	112	return r;
4912e2fe EL	113	}
4912e2fe EL	114
be9b720a TW	115	/* to be sure on the stack we alloc memory */
	116	if_version_length = sizeof(struct mei_nfc_reply) +
	117	sizeof(struct mei_nfc_if_version);
73f3adb9	118
be9b720a TW	119	reply = kzalloc(if_version_length, GFP_KERNEL);
	120	if (!reply)
	121	return -ENOMEM;
	122
d49dc5e7	123	bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
582ab27a	124	if (bytes_recv < 0 \|\| bytes_recv < if_version_length) {
be9b720a TW	125	pr_err("Could not read IF version\n");
	126	r = -EIO;
	127	goto err;
73f3adb9 SO	128	}
73f3adb9 SO	129
be9b720a	130	version = (struct mei_nfc_if_version *)reply->data;
4912e2fe	131
be9b720a TW	132	phy->fw_ivn = version->fw_ivn;
	133	phy->vendor_id = version->vendor_id;
	134	phy->radio_type = version->radio_type;
	135
	136	err:
	137	kfree(reply);
	138	return r;
4912e2fe	139	}
4912e2fe	140
be9b720a	141	static int mei_nfc_connect(struct nfc_mei_phy *phy)
4912e2fe	142	{
be9b720a TW	143	struct mei_nfc_cmd cmd, reply;
	144	struct mei_nfc_connect *connect;
	145	struct mei_nfc_connect_resp *connect_resp;
	146	size_t connect_length, connect_resp_length;
	147	int bytes_recv, r;
4912e2fe EL	148
	149	pr_info("%s\n", __func__);
	150
be9b720a TW	151	connect_length = sizeof(struct mei_nfc_cmd) +
be9b720a TW	152	sizeof(struct mei_nfc_connect);
4912e2fe	153
be9b720a TW	154	connect_resp_length = sizeof(struct mei_nfc_cmd) +
	155	sizeof(struct mei_nfc_connect_resp);
	156
	157	cmd = kzalloc(connect_length, GFP_KERNEL);
	158	if (!cmd)
	159	return -ENOMEM;
	160	connect = (struct mei_nfc_connect *)cmd->data;
	161
	162	reply = kzalloc(connect_resp_length, GFP_KERNEL);
	163	if (!reply) {
	164	kfree(cmd);
	165	return -ENOMEM;
	166	}
	167
	168	connect_resp = (struct mei_nfc_connect_resp *)reply->data;
	169
1d3ff767 TW	170	cmd->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
1d3ff767 TW	171	cmd->hdr.data_size = 3;
be9b720a TW	172	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
	173	connect->fw_ivn = phy->fw_ivn;
	174	connect->vendor_id = phy->vendor_id;
	175
1d3ff767	176	MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
d49dc5e7	177	r = mei_cldev_send(phy->cldev, (u8 *)cmd, connect_length);
be9b720a TW	178	if (r < 0) {
	179	pr_err("Could not send connect cmd %d\n", r);
	180	goto err;
	181	}
	182
d49dc5e7 TW	183	bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply,
d49dc5e7 TW	184	connect_resp_length);
be9b720a TW	185	if (bytes_recv < 0) {
	186	r = bytes_recv;
	187	pr_err("Could not read connect response %d\n", r);
	188	goto err;
	189	}
	190
1d3ff767 TW	191	MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);
1d3ff767 TW	192
be9b720a TW	193	pr_info("IVN 0x%x Vendor ID 0x%x\n",
	194	connect_resp->fw_ivn, connect_resp->vendor_id);
	195
	196	pr_info("ME FW %d.%d.%d.%d\n",
	197	connect_resp->me_major, connect_resp->me_minor,
	198	connect_resp->me_hotfix, connect_resp->me_build);
	199
	200	r = 0;
	201
	202	err:
	203	kfree(reply);
	204	kfree(cmd);
	205
	206	return r;
	207	}
	208
	209	static int mei_nfc_send(struct nfc_mei_phy phy, u8 buf, size_t length)
	210	{
1d3ff767	211	struct mei_nfc_hdr *hdr;
be9b720a TW	212	u8 *mei_buf;
	213	int err;
	214
	215	err = -ENOMEM;
	216	mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
	217	if (!mei_buf)
	218	goto out;
	219
1d3ff767	220	hdr = (struct mei_nfc_hdr *)mei_buf;
be9b720a TW	221	hdr->cmd = MEI_NFC_CMD_HCI_SEND;
	222	hdr->status = 0;
	223	hdr->req_id = phy->req_id;
	224	hdr->reserved = 0;
	225	hdr->data_size = length;
	226
1d3ff767 TW	227	MEI_DUMP_NFC_HDR("send", hdr);
1d3ff767 TW	228
be9b720a	229	memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
d49dc5e7	230	err = mei_cldev_send(phy->cldev, mei_buf, length + MEI_NFC_HEADER_SIZE);
be9b720a TW	231	if (err < 0)
	232	goto out;
	233
	234	if (!wait_event_interruptible_timeout(phy->send_wq,
	235	phy->recv_req_id == phy->req_id, HZ)) {
	236	pr_err("NFC MEI command timeout\n");
	237	err = -ETIME;
	238	} else {
	239	phy->req_id++;
	240	}
	241	out:
	242	kfree(mei_buf);
	243	return err;
4912e2fe	244	}
4912e2fe EL	245
	246	/*
	247	* Writing a frame must not return the number of written bytes.
	248	* It must return either zero for success, or <0 for error.
	249	* In addition, it must not alter the skb
	250	*/
	251	static int nfc_mei_phy_write(void phy_id, struct sk_buff skb)
	252	{
	253	struct nfc_mei_phy *phy = phy_id;
	254	int r;
	255
	256	MEI_DUMP_SKB_OUT("mei frame sent", skb);
	257
be9b720a	258	r = mei_nfc_send(phy, skb->data, skb->len);
4912e2fe EL	259	if (r > 0)
	260	r = 0;
	261
	262	return r;
	263	}
	264
be9b720a TW	265	static int mei_nfc_recv(struct nfc_mei_phy phy, u8 buf, size_t length)
be9b720a TW	266	{
1d3ff767	267	struct mei_nfc_hdr *hdr;
be9b720a TW	268	int received_length;
be9b720a TW	269
d49dc5e7	270	received_length = mei_cldev_recv(phy->cldev, buf, length);
be9b720a TW	271	if (received_length < 0)
	272	return received_length;
	273
1d3ff767	274	hdr = (struct mei_nfc_hdr *) buf;
be9b720a	275
1d3ff767 TW	276	MEI_DUMP_NFC_HDR("receive", hdr);
	277	if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
	278	phy->recv_req_id = hdr->req_id;
be9b720a TW	279	wake_up(&phy->send_wq);
	280
	281	return 0;
	282	}
	283
	284	return received_length;
	285	}
	286
	287
7c7a6077	288	static void nfc_mei_rx_cb(struct mei_cl_device *cldev)
4912e2fe	289	{
972cedf6	290	struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
7c7a6077 AU	291	struct sk_buff *skb;
7c7a6077 AU	292	int reply_size;
972cedf6 TW	293
	294	if (!phy)
	295	return;
4912e2fe EL	296
	297	if (phy->hard_fault != 0)
	298	return;
	299
7c7a6077 AU	300	skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
	301	if (!skb)
	302	return;
4912e2fe	303
7c7a6077 AU	304	reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
	305	if (reply_size < MEI_NFC_HEADER_SIZE) {
	306	kfree_skb(skb);
	307	return;
	308	}
4912e2fe	309
7c7a6077 AU	310	skb_put(skb, reply_size);
7c7a6077 AU	311	skb_pull(skb, MEI_NFC_HEADER_SIZE);
4912e2fe	312
7c7a6077	313	MEI_DUMP_SKB_IN("mei frame read", skb);
4912e2fe	314
7c7a6077	315	nfc_hci_recv_frame(phy->hdev, skb);
4912e2fe	316	}
be9b720a TW	317
	318	static int nfc_mei_phy_enable(void *phy_id)
	319	{
	320	int r;
	321	struct nfc_mei_phy *phy = phy_id;
	322
	323	pr_info("%s\n", __func__);
	324
	325	if (phy->powered == 1)
	326	return 0;
	327
d49dc5e7	328	r = mei_cldev_enable(phy->cldev);
be9b720a TW	329	if (r < 0) {
	330	pr_err("Could not enable device %d\n", r);
	331	return r;
	332	}
	333
	334	r = mei_nfc_if_version(phy);
	335	if (r < 0) {
	336	pr_err("Could not enable device %d\n", r);
	337	goto err;
	338	}
	339
	340	r = mei_nfc_connect(phy);
	341	if (r < 0) {
	342	pr_err("Could not connect to device %d\n", r);
	343	goto err;
	344	}
	345
7c7a6077	346	r = mei_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb);
be9b720a TW	347	if (r) {
	348	pr_err("Event cb registration failed %d\n", r);
	349	goto err;
	350	}
	351
	352	phy->powered = 1;
	353
	354	return 0;
	355
	356	err:
	357	phy->powered = 0;
d49dc5e7	358	mei_cldev_disable(phy->cldev);
be9b720a TW	359	return r;
	360	}
	361
	362	static void nfc_mei_phy_disable(void *phy_id)
	363	{
	364	struct nfc_mei_phy *phy = phy_id;
	365
	366	pr_info("%s\n", __func__);
	367
d49dc5e7	368	mei_cldev_disable(phy->cldev);
be9b720a TW	369
	370	phy->powered = 0;
	371	}
4912e2fe EL	372
	373	struct nfc_phy_ops mei_phy_ops = {
	374	.write = nfc_mei_phy_write,
	375	.enable = nfc_mei_phy_enable,
	376	.disable = nfc_mei_phy_disable,
	377	};
	378	EXPORT_SYMBOL_GPL(mei_phy_ops);
	379
89391382	380	struct nfc_mei_phy nfc_mei_phy_alloc(struct mei_cl_device cldev)
4912e2fe EL	381	{
	382	struct nfc_mei_phy *phy;
	383
	384	phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
	385	if (!phy)
	386	return NULL;
	387
89391382	388	phy->cldev = cldev;
be9b720a	389	init_waitqueue_head(&phy->send_wq);
d49dc5e7	390	mei_cldev_set_drvdata(cldev, phy);
4912e2fe EL	391
	392	return phy;
	393	}
	394	EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
	395
	396	void nfc_mei_phy_free(struct nfc_mei_phy *phy)
	397	{
d49dc5e7	398	mei_cldev_disable(phy->cldev);
4912e2fe EL	399	kfree(phy);
	400	}
	401	EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
	402
	403	MODULE_LICENSE("GPL");
	404	MODULE_DESCRIPTION("mei bus NFC device interface");