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

/*
 * 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_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
4912e2fe EL	1	/*
	2	* MEI Library for mei bus nfc device access
	3	*
	4	* Copyright (C) 2013 Intel Corporation. All rights reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
98b32dec	16	* along with this program; if not, see <http://www.gnu.org/licenses/>.
4912e2fe EL	17	*/
4912e2fe EL	18
17936b43 JP	19	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17936b43 JP	20
4912e2fe EL	21	#include <linux/module.h>
	22	#include <linux/slab.h>
	23	#include <linux/nfc.h>
	24
	25	#include "mei_phy.h"
	26
1d3ff767 TW	27	struct mei_nfc_hdr {
1d3ff767 TW	28	u8 cmd;
be9b720a TW	29	u8 status;
	30	u16 req_id;
	31	u32 reserved;
	32	u16 data_size;
1d3ff767 TW	33	} __packed;
	34
	35	struct mei_nfc_cmd {
	36	struct mei_nfc_hdr hdr;
be9b720a TW	37	u8 sub_command;
	38	u8 data[];
	39	} __packed;
	40
	41	struct mei_nfc_reply {
1d3ff767	42	struct mei_nfc_hdr hdr;
be9b720a TW	43	u8 sub_command;
	44	u8 reply_status;
	45	u8 data[];
	46	} __packed;
	47
	48	struct mei_nfc_if_version {
	49	u8 radio_version_sw[3];
	50	u8 reserved[3];
	51	u8 radio_version_hw[3];
	52	u8 i2c_addr;
	53	u8 fw_ivn;
	54	u8 vendor_id;
	55	u8 radio_type;
	56	} __packed;
	57
	58	struct mei_nfc_connect {
	59	u8 fw_ivn;
	60	u8 vendor_id;
	61	} __packed;
	62
	63	struct mei_nfc_connect_resp {
	64	u8 fw_ivn;
	65	u8 vendor_id;
	66	u16 me_major;
	67	u16 me_minor;
	68	u16 me_hotfix;
	69	u16 me_build;
	70	} __packed;
	71
4912e2fe	72
be9b720a TW	73	#define MEI_NFC_CMD_MAINTENANCE 0x00
	74	#define MEI_NFC_CMD_HCI_SEND 0x01
	75	#define MEI_NFC_CMD_HCI_RECV 0x02
	76
	77	#define MEI_NFC_SUBCMD_CONNECT 0x00
	78	#define MEI_NFC_SUBCMD_IF_VERSION 0x01
	79
4912e2fe EL	80	#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
	81
	82	#define MEI_DUMP_SKB_IN(info, skb) \
	83	do { \
	84	pr_debug("%s:\n", info); \
	85	print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
	86	16, 1, (skb)->data, (skb)->len, false); \
	87	} while (0)
	88
	89	#define MEI_DUMP_SKB_OUT(info, skb) \
	90	do { \
	91	pr_debug("%s:\n", info); \
	92	print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
be9b720a	93	16, 1, (skb)->data, (skb)->len, false); \
4912e2fe EL	94	} while (0)
4912e2fe EL	95
1d3ff767 TW	96	#define MEI_DUMP_NFC_HDR(info, _hdr) \
	97	do { \
	98	pr_debug("%s:\n", info); \
	99	pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n", \
	100	(_hdr)->cmd, (_hdr)->status, (_hdr)->req_id, \
	101	(_hdr)->reserved, (_hdr)->data_size); \
	102	} while (0)
be9b720a TW	103
be9b720a TW	104	static int mei_nfc_if_version(struct nfc_mei_phy *phy)
4912e2fe	105	{
be9b720a TW	106
	107	struct mei_nfc_cmd cmd;
	108	struct mei_nfc_reply *reply = NULL;
	109	struct mei_nfc_if_version *version;
	110	size_t if_version_length;
	111	int bytes_recv, r;
4912e2fe EL	112
	113	pr_info("%s\n", __func__);
	114
be9b720a	115	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
1d3ff767 TW	116	cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
1d3ff767 TW	117	cmd.hdr.data_size = 1;
be9b720a	118	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
4912e2fe	119
1d3ff767	120	MEI_DUMP_NFC_HDR("version", &cmd.hdr);
d49dc5e7	121	r = mei_cldev_send(phy->cldev, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
4912e2fe	122	if (r < 0) {
be9b720a	123	pr_err("Could not send IF version cmd\n");
bda7eb27	124	return r;
4912e2fe EL	125	}
4912e2fe EL	126
be9b720a TW	127	/* to be sure on the stack we alloc memory */
	128	if_version_length = sizeof(struct mei_nfc_reply) +
	129	sizeof(struct mei_nfc_if_version);
73f3adb9	130
be9b720a TW	131	reply = kzalloc(if_version_length, GFP_KERNEL);
	132	if (!reply)
	133	return -ENOMEM;
	134
d49dc5e7	135	bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
582ab27a	136	if (bytes_recv < 0 \|\| bytes_recv < if_version_length) {
be9b720a TW	137	pr_err("Could not read IF version\n");
	138	r = -EIO;
	139	goto err;
73f3adb9 SO	140	}
73f3adb9 SO	141
be9b720a	142	version = (struct mei_nfc_if_version *)reply->data;
4912e2fe	143
be9b720a TW	144	phy->fw_ivn = version->fw_ivn;
	145	phy->vendor_id = version->vendor_id;
	146	phy->radio_type = version->radio_type;
	147
	148	err:
	149	kfree(reply);
	150	return r;
4912e2fe	151	}
4912e2fe	152
be9b720a	153	static int mei_nfc_connect(struct nfc_mei_phy *phy)
4912e2fe	154	{
be9b720a TW	155	struct mei_nfc_cmd cmd, reply;
	156	struct mei_nfc_connect *connect;
	157	struct mei_nfc_connect_resp *connect_resp;
	158	size_t connect_length, connect_resp_length;
	159	int bytes_recv, r;
4912e2fe EL	160
	161	pr_info("%s\n", __func__);
	162
be9b720a TW	163	connect_length = sizeof(struct mei_nfc_cmd) +
be9b720a TW	164	sizeof(struct mei_nfc_connect);
4912e2fe	165
be9b720a TW	166	connect_resp_length = sizeof(struct mei_nfc_cmd) +
	167	sizeof(struct mei_nfc_connect_resp);
	168
	169	cmd = kzalloc(connect_length, GFP_KERNEL);
	170	if (!cmd)
	171	return -ENOMEM;
	172	connect = (struct mei_nfc_connect *)cmd->data;
	173
	174	reply = kzalloc(connect_resp_length, GFP_KERNEL);
	175	if (!reply) {
	176	kfree(cmd);
	177	return -ENOMEM;
	178	}
	179
	180	connect_resp = (struct mei_nfc_connect_resp *)reply->data;
	181
1d3ff767 TW	182	cmd->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
1d3ff767 TW	183	cmd->hdr.data_size = 3;
be9b720a TW	184	cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
	185	connect->fw_ivn = phy->fw_ivn;
	186	connect->vendor_id = phy->vendor_id;
	187
1d3ff767	188	MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
d49dc5e7	189	r = mei_cldev_send(phy->cldev, (u8 *)cmd, connect_length);
be9b720a TW	190	if (r < 0) {
	191	pr_err("Could not send connect cmd %d\n", r);
	192	goto err;
	193	}
	194
d49dc5e7 TW	195	bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply,
d49dc5e7 TW	196	connect_resp_length);
be9b720a TW	197	if (bytes_recv < 0) {
	198	r = bytes_recv;
	199	pr_err("Could not read connect response %d\n", r);
	200	goto err;
	201	}
	202
1d3ff767 TW	203	MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);
1d3ff767 TW	204
be9b720a TW	205	pr_info("IVN 0x%x Vendor ID 0x%x\n",
	206	connect_resp->fw_ivn, connect_resp->vendor_id);
	207
	208	pr_info("ME FW %d.%d.%d.%d\n",
	209	connect_resp->me_major, connect_resp->me_minor,
	210	connect_resp->me_hotfix, connect_resp->me_build);
	211
	212	r = 0;
	213
	214	err:
	215	kfree(reply);
	216	kfree(cmd);
	217
	218	return r;
	219	}
	220
	221	static int mei_nfc_send(struct nfc_mei_phy phy, u8 buf, size_t length)
	222	{
1d3ff767	223	struct mei_nfc_hdr *hdr;
be9b720a TW	224	u8 *mei_buf;
	225	int err;
	226
	227	err = -ENOMEM;
	228	mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
	229	if (!mei_buf)
	230	goto out;
	231
1d3ff767	232	hdr = (struct mei_nfc_hdr *)mei_buf;
be9b720a TW	233	hdr->cmd = MEI_NFC_CMD_HCI_SEND;
	234	hdr->status = 0;
	235	hdr->req_id = phy->req_id;
	236	hdr->reserved = 0;
	237	hdr->data_size = length;
	238
1d3ff767 TW	239	MEI_DUMP_NFC_HDR("send", hdr);
1d3ff767 TW	240
be9b720a	241	memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
d49dc5e7	242	err = mei_cldev_send(phy->cldev, mei_buf, length + MEI_NFC_HEADER_SIZE);
be9b720a TW	243	if (err < 0)
	244	goto out;
	245
	246	if (!wait_event_interruptible_timeout(phy->send_wq,
	247	phy->recv_req_id == phy->req_id, HZ)) {
	248	pr_err("NFC MEI command timeout\n");
	249	err = -ETIME;
	250	} else {
	251	phy->req_id++;
	252	}
	253	out:
	254	kfree(mei_buf);
	255	return err;
4912e2fe	256	}
4912e2fe EL	257
	258	/*
	259	* Writing a frame must not return the number of written bytes.
	260	* It must return either zero for success, or <0 for error.
	261	* In addition, it must not alter the skb
	262	*/
	263	static int nfc_mei_phy_write(void phy_id, struct sk_buff skb)
	264	{
	265	struct nfc_mei_phy *phy = phy_id;
	266	int r;
	267
	268	MEI_DUMP_SKB_OUT("mei frame sent", skb);
	269
be9b720a	270	r = mei_nfc_send(phy, skb->data, skb->len);
4912e2fe EL	271	if (r > 0)
	272	r = 0;
	273
	274	return r;
	275	}
	276
be9b720a TW	277	static int mei_nfc_recv(struct nfc_mei_phy phy, u8 buf, size_t length)
be9b720a TW	278	{
1d3ff767	279	struct mei_nfc_hdr *hdr;
be9b720a TW	280	int received_length;
be9b720a TW	281
d49dc5e7	282	received_length = mei_cldev_recv(phy->cldev, buf, length);
be9b720a TW	283	if (received_length < 0)
	284	return received_length;
	285
1d3ff767	286	hdr = (struct mei_nfc_hdr *) buf;
be9b720a	287
1d3ff767 TW	288	MEI_DUMP_NFC_HDR("receive", hdr);
	289	if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
	290	phy->recv_req_id = hdr->req_id;
be9b720a TW	291	wake_up(&phy->send_wq);
	292
	293	return 0;
	294	}
	295
	296	return received_length;
	297	}
	298
	299
7c7a6077	300	static void nfc_mei_rx_cb(struct mei_cl_device *cldev)
4912e2fe	301	{
972cedf6	302	struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
7c7a6077 AU	303	struct sk_buff *skb;
7c7a6077 AU	304	int reply_size;
972cedf6 TW	305
	306	if (!phy)
	307	return;
4912e2fe EL	308
	309	if (phy->hard_fault != 0)
	310	return;
	311
7c7a6077 AU	312	skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
	313	if (!skb)
	314	return;
4912e2fe	315
7c7a6077 AU	316	reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
	317	if (reply_size < MEI_NFC_HEADER_SIZE) {
	318	kfree_skb(skb);
	319	return;
	320	}
4912e2fe	321
7c7a6077 AU	322	skb_put(skb, reply_size);
7c7a6077 AU	323	skb_pull(skb, MEI_NFC_HEADER_SIZE);
4912e2fe	324
7c7a6077	325	MEI_DUMP_SKB_IN("mei frame read", skb);
4912e2fe	326
7c7a6077	327	nfc_hci_recv_frame(phy->hdev, skb);
4912e2fe	328	}
be9b720a TW	329
	330	static int nfc_mei_phy_enable(void *phy_id)
	331	{
	332	int r;
	333	struct nfc_mei_phy *phy = phy_id;
	334
	335	pr_info("%s\n", __func__);
	336
	337	if (phy->powered == 1)
	338	return 0;
	339
d49dc5e7	340	r = mei_cldev_enable(phy->cldev);
be9b720a TW	341	if (r < 0) {
	342	pr_err("Could not enable device %d\n", r);
	343	return r;
	344	}
	345
	346	r = mei_nfc_if_version(phy);
	347	if (r < 0) {
	348	pr_err("Could not enable device %d\n", r);
	349	goto err;
	350	}
	351
	352	r = mei_nfc_connect(phy);
	353	if (r < 0) {
	354	pr_err("Could not connect to device %d\n", r);
	355	goto err;
	356	}
	357
7c7a6077	358	r = mei_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb);
be9b720a TW	359	if (r) {
	360	pr_err("Event cb registration failed %d\n", r);
	361	goto err;
	362	}
	363
	364	phy->powered = 1;
	365
	366	return 0;
	367
	368	err:
	369	phy->powered = 0;
d49dc5e7	370	mei_cldev_disable(phy->cldev);
be9b720a TW	371	return r;
	372	}
	373
	374	static void nfc_mei_phy_disable(void *phy_id)
	375	{
	376	struct nfc_mei_phy *phy = phy_id;
	377
	378	pr_info("%s\n", __func__);
	379
d49dc5e7	380	mei_cldev_disable(phy->cldev);
be9b720a TW	381
	382	phy->powered = 0;
	383	}
4912e2fe EL	384
	385	struct nfc_phy_ops mei_phy_ops = {
	386	.write = nfc_mei_phy_write,
	387	.enable = nfc_mei_phy_enable,
	388	.disable = nfc_mei_phy_disable,
	389	};
	390	EXPORT_SYMBOL_GPL(mei_phy_ops);
	391
89391382	392	struct nfc_mei_phy nfc_mei_phy_alloc(struct mei_cl_device cldev)
4912e2fe EL	393	{
	394	struct nfc_mei_phy *phy;
	395
	396	phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
	397	if (!phy)
	398	return NULL;
	399
89391382	400	phy->cldev = cldev;
be9b720a	401	init_waitqueue_head(&phy->send_wq);
d49dc5e7	402	mei_cldev_set_drvdata(cldev, phy);
4912e2fe EL	403
	404	return phy;
	405	}
	406	EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
	407
	408	void nfc_mei_phy_free(struct nfc_mei_phy *phy)
	409	{
d49dc5e7	410	mei_cldev_disable(phy->cldev);
4912e2fe EL	411	kfree(phy);
	412	}
	413	EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
	414
	415	MODULE_LICENSE("GPL");
	416	MODULE_DESCRIPTION("mei bus NFC device interface");