[mirror_ubuntu-zesty-kernel.git] / drivers / nfc / nfcwilink.c

/*
 *  Texas Instrument's NFC Driver For Shared Transport.
 *
 *  NFC Driver acts as interface between NCI core and
 *  TI Shared Transport Layer.
 *
 *  Copyright (C) 2011 Texas Instruments, Inc.
 *
 *  Written by Ilan Elias <ilane@ti.com>
 *
 *  Acknowledgements:
 *  This file is based on btwilink.c, which was written
 *  by Raja Mani and Pavan Savoy.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms 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/>.
 *
 */
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/firmware.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/ti_wilink_st.h>

#define NFCWILINK_CHNL			12
#define NFCWILINK_OPCODE		7
#define NFCWILINK_MAX_FRAME_SIZE	300
#define NFCWILINK_HDR_LEN		4
#define NFCWILINK_OFFSET_LEN_IN_HDR	1
#define NFCWILINK_LEN_SIZE		2
#define NFCWILINK_REGISTER_TIMEOUT	8000	/* 8 sec */
#define NFCWILINK_CMD_TIMEOUT		5000	/* 5 sec */

#define BTS_FILE_NAME_MAX_SIZE		40
#define BTS_FILE_HDR_MAGIC		0x42535442
#define BTS_FILE_CMD_MAX_LEN		0xff
#define BTS_FILE_ACTION_TYPE_SEND_CMD	1

#define NCI_VS_NFCC_INFO_CMD_GID	0x2f
#define NCI_VS_NFCC_INFO_CMD_OID	0x12
#define NCI_VS_NFCC_INFO_RSP_GID	0x4f
#define NCI_VS_NFCC_INFO_RSP_OID	0x12

struct nfcwilink_hdr {
	__u8 chnl;
	__u8 opcode;
	__le16 len;
} __packed;

struct nci_vs_nfcc_info_cmd {
	__u8 gid;
	__u8 oid;
	__u8 plen;
} __packed;

struct nci_vs_nfcc_info_rsp {
	__u8 gid;
	__u8 oid;
	__u8 plen;
	__u8 status;
	__u8 hw_id;
	__u8 sw_ver_x;
	__u8 sw_ver_z;
	__u8 patch_id;
} __packed;

struct bts_file_hdr {
	__le32 magic;
	__le32 ver;
	__u8 rfu[24];
	__u8 actions[0];
} __packed;

struct bts_file_action {
	__le16 type;
	__le16 len;
	__u8 data[0];
} __packed;

struct nfcwilink {
	struct platform_device		*pdev;
	struct nci_dev			*ndev;
	unsigned long			flags;

	int				st_register_cb_status;
	long				(*st_write) (struct sk_buff *);

	struct completion		completed;

	struct nci_vs_nfcc_info_rsp	nfcc_info;
};

/* NFCWILINK driver flags */
enum {
	NFCWILINK_RUNNING,
	NFCWILINK_FW_DOWNLOAD,
};

static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb);

static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
{
	struct sk_buff *skb;

	skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
	if (skb)
		skb_reserve(skb, NFCWILINK_HDR_LEN);

	return skb;
}

static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
						struct sk_buff *skb)
{
	struct nci_vs_nfcc_info_rsp *rsp = (void *)skb->data;

	/* Detect NCI_VS_NFCC_INFO_RSP and store the result */
	if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
		(rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
		memcpy(&drv->nfcc_info, rsp,
			sizeof(struct nci_vs_nfcc_info_rsp));
	}

	kfree_skb(skb);

	complete(&drv->completed);
}

static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
{
	struct nci_vs_nfcc_info_cmd *cmd;
	struct sk_buff *skb;
	unsigned long comp_ret;
	int rc;

	skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
					GFP_KERNEL);
	if (!skb) {
		nfc_err(&drv->pdev->dev,
			"no memory for nci_vs_nfcc_info_cmd\n");
		return -ENOMEM;
	}

	cmd = (struct nci_vs_nfcc_info_cmd *)
			skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
	cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
	cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
	cmd->plen = 0;

	drv->nfcc_info.plen = 0;

	rc = nfcwilink_send(drv->ndev, skb);
	if (rc)
		return rc;

	comp_ret = wait_for_completion_timeout(&drv->completed,
				msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
	dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld\n",
		comp_ret);
	if (comp_ret == 0) {
		nfc_err(&drv->pdev->dev,
			"timeout on wait_for_completion_timeout\n");
		return -ETIMEDOUT;
	}

	dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d\n",
		drv->nfcc_info.plen, drv->nfcc_info.status);

	if ((drv->nfcc_info.plen != 5) || (drv->nfcc_info.status != 0)) {
		nfc_err(&drv->pdev->dev, "invalid nci_vs_nfcc_info_rsp\n");
		return -EINVAL;
	}

	snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
			"TINfcInit_%d.%d.%d.%d.bts",
			drv->nfcc_info.hw_id,
			drv->nfcc_info.sw_ver_x,
			drv->nfcc_info.sw_ver_z,
			drv->nfcc_info.patch_id);

	nfc_info(&drv->pdev->dev, "nfcwilink FW file name: %s\n", file_name);

	return 0;
}

static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
{
	struct nfcwilink_hdr *hdr = (struct nfcwilink_hdr *)data;
	struct sk_buff *skb;
	unsigned long comp_ret;
	int rc;

	/* verify valid cmd for the NFC channel */
	if ((len <= sizeof(struct nfcwilink_hdr)) ||
		(len > BTS_FILE_CMD_MAX_LEN) ||
		(hdr->chnl != NFCWILINK_CHNL) ||
		(hdr->opcode != NFCWILINK_OPCODE)) {
		nfc_err(&drv->pdev->dev,
			"ignoring invalid bts cmd, len %d, chnl %d, opcode %d\n",
			len, hdr->chnl, hdr->opcode);
		return 0;
	}

	/* remove the ST header */
	len -= sizeof(struct nfcwilink_hdr);
	data += sizeof(struct nfcwilink_hdr);

	skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
	if (!skb) {
		nfc_err(&drv->pdev->dev, "no memory for bts cmd\n");
		return -ENOMEM;
	}

	memcpy(skb_put(skb, len), data, len);

	rc = nfcwilink_send(drv->ndev, skb);
	if (rc)
		return rc;

	comp_ret = wait_for_completion_timeout(&drv->completed,
				msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
	dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld\n",
		comp_ret);
	if (comp_ret == 0) {
		nfc_err(&drv->pdev->dev,
			"timeout on wait_for_completion_timeout\n");
		return -ETIMEDOUT;
	}

	return 0;
}

static int nfcwilink_download_fw(struct nfcwilink *drv)
{
	unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
	const struct firmware *fw;
	__u16 action_type, action_len;
	__u8 *ptr;
	int len, rc;

	set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);

	rc = nfcwilink_get_bts_file_name(drv, file_name);
	if (rc)
		goto exit;

	rc = request_firmware(&fw, file_name, &drv->pdev->dev);
	if (rc) {
		nfc_err(&drv->pdev->dev, "request_firmware failed %d\n", rc);

		/* if the file is not found, don't exit with failure */
		if (rc == -ENOENT)
			rc = 0;

		goto exit;
	}

	len = fw->size;
	ptr = (__u8 *)fw->data;

	if ((len == 0) || (ptr == NULL)) {
		dev_dbg(&drv->pdev->dev,
			"request_firmware returned size %d\n", len);
		goto release_fw;
	}

	if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
			BTS_FILE_HDR_MAGIC) {
		nfc_err(&drv->pdev->dev, "wrong bts magic number\n");
		rc = -EINVAL;
		goto release_fw;
	}

	/* remove the BTS header */
	len -= sizeof(struct bts_file_hdr);
	ptr += sizeof(struct bts_file_hdr);

	while (len > 0) {
		action_type =
			__le16_to_cpu(((struct bts_file_action *)ptr)->type);
		action_len =
			__le16_to_cpu(((struct bts_file_action *)ptr)->len);

		dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d\n",
			action_type, action_len);

		switch (action_type) {
		case BTS_FILE_ACTION_TYPE_SEND_CMD:
			rc = nfcwilink_send_bts_cmd(drv,
					((struct bts_file_action *)ptr)->data,
					action_len);
			if (rc)
				goto release_fw;
			break;
		}

		/* advance to the next action */
		len -= (sizeof(struct bts_file_action) + action_len);
		ptr += (sizeof(struct bts_file_action) + action_len);
	}

release_fw:
	release_firmware(fw);

exit:
	clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
	return rc;
}

/* Called by ST when registration is complete */
static void nfcwilink_register_complete(void *priv_data, int data)
{
	struct nfcwilink *drv = priv_data;

	/* store ST registration status */
	drv->st_register_cb_status = data;

	/* complete the wait in nfc_st_open() */
	complete(&drv->completed);
}

/* Called by ST when receive data is available */
static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
{
	struct nfcwilink *drv = priv_data;
	int rc;

	if (!skb)
		return -EFAULT;

	if (!drv) {
		kfree_skb(skb);
		return -EFAULT;
	}

	dev_dbg(&drv->pdev->dev, "receive entry, len %d\n", skb->len);

	/* strip the ST header
	(apart for the chnl byte, which is not received in the hdr) */
	skb_pull(skb, (NFCWILINK_HDR_LEN-1));

	if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
		nfcwilink_fw_download_receive(drv, skb);
		return 0;
	}

	/* Forward skb to NCI core layer */
	rc = nci_recv_frame(drv->ndev, skb);
	if (rc < 0) {
		nfc_err(&drv->pdev->dev, "nci_recv_frame failed %d\n", rc);
		return rc;
	}

	return 0;
}

/* protocol structure registered with ST */
static struct st_proto_s nfcwilink_proto = {
	.chnl_id = NFCWILINK_CHNL,
	.max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
	.hdr_len = (NFCWILINK_HDR_LEN-1),	/* not including chnl byte */
	.offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
	.len_size = NFCWILINK_LEN_SIZE,
	.reserve = 0,
	.recv = nfcwilink_receive,
	.reg_complete_cb = nfcwilink_register_complete,
	.write = NULL,
};

static int nfcwilink_open(struct nci_dev *ndev)
{
	struct nfcwilink *drv = nci_get_drvdata(ndev);
	unsigned long comp_ret;
	int rc;

	if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
		rc = -EBUSY;
		goto exit;
	}

	nfcwilink_proto.priv_data = drv;

	init_completion(&drv->completed);
	drv->st_register_cb_status = -EINPROGRESS;

	rc = st_register(&nfcwilink_proto);
	if (rc < 0) {
		if (rc == -EINPROGRESS) {
			comp_ret = wait_for_completion_timeout(
			&drv->completed,
			msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));

			dev_dbg(&drv->pdev->dev,
				"wait_for_completion_timeout returned %ld\n",
				comp_ret);

			if (comp_ret == 0) {
				/* timeout */
				rc = -ETIMEDOUT;
				goto clear_exit;
			} else if (drv->st_register_cb_status != 0) {
				rc = drv->st_register_cb_status;
				nfc_err(&drv->pdev->dev,
					"st_register_cb failed %d\n", rc);
				goto clear_exit;
			}
		} else {
			nfc_err(&drv->pdev->dev, "st_register failed %d\n", rc);
			goto clear_exit;
		}
	}

	/* st_register MUST fill the write callback */
	BUG_ON(nfcwilink_proto.write == NULL);
	drv->st_write = nfcwilink_proto.write;

	if (nfcwilink_download_fw(drv)) {
		nfc_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d\n",
			rc);
		/* open should succeed, even if the FW download failed */
	}

	goto exit;

clear_exit:
	clear_bit(NFCWILINK_RUNNING, &drv->flags);

exit:
	return rc;
}

static int nfcwilink_close(struct nci_dev *ndev)
{
	struct nfcwilink *drv = nci_get_drvdata(ndev);
	int rc;

	if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
		return 0;

	rc = st_unregister(&nfcwilink_proto);
	if (rc)
		nfc_err(&drv->pdev->dev, "st_unregister failed %d\n", rc);

	drv->st_write = NULL;

	return rc;
}

static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nfcwilink *drv = nci_get_drvdata(ndev);
	struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
	long len;

	dev_dbg(&drv->pdev->dev, "send entry, len %d\n", skb->len);

	if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) {
		kfree_skb(skb);
		return -EINVAL;
	}

	/* add the ST hdr to the start of the buffer */
	hdr.len = cpu_to_le16(skb->len);
	memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);

	/* Insert skb to shared transport layer's transmit queue.
	 * Freeing skb memory is taken care in shared transport layer,
	 * so don't free skb memory here.
	 */
	len = drv->st_write(skb);
	if (len < 0) {
		kfree_skb(skb);
		nfc_err(&drv->pdev->dev, "st_write failed %ld\n", len);
		return -EFAULT;
	}

	return 0;
}

static struct nci_ops nfcwilink_ops = {
	.open = nfcwilink_open,
	.close = nfcwilink_close,
	.send = nfcwilink_send,
};

static int nfcwilink_probe(struct platform_device *pdev)
{
	struct nfcwilink *drv;
	int rc;
	__u32 protocols;

	drv = devm_kzalloc(&pdev->dev, sizeof(struct nfcwilink), GFP_KERNEL);
	if (!drv) {
		rc = -ENOMEM;
		goto exit;
	}

	drv->pdev = pdev;

	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;

	drv->ndev = nci_allocate_device(&nfcwilink_ops,
					protocols,
					NFCWILINK_HDR_LEN,
					0);
	if (!drv->ndev) {
		nfc_err(&pdev->dev, "nci_allocate_device failed\n");
		rc = -ENOMEM;
		goto exit;
	}

	nci_set_parent_dev(drv->ndev, &pdev->dev);
	nci_set_drvdata(drv->ndev, drv);

	rc = nci_register_device(drv->ndev);
	if (rc < 0) {
		nfc_err(&pdev->dev, "nci_register_device failed %d\n", rc);
		goto free_dev_exit;
	}

	dev_set_drvdata(&pdev->dev, drv);

	goto exit;

free_dev_exit:
	nci_free_device(drv->ndev);

exit:
	return rc;
}

static int nfcwilink_remove(struct platform_device *pdev)
{
	struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
	struct nci_dev *ndev;

	if (!drv)
		return -EFAULT;

	ndev = drv->ndev;

	nci_unregister_device(ndev);
	nci_free_device(ndev);

	return 0;
}

static struct platform_driver nfcwilink_driver = {
	.probe = nfcwilink_probe,
	.remove = nfcwilink_remove,
	.driver = {
		.name = "nfcwilink",
	},
};

module_platform_driver(nfcwilink_driver);

/* ------ Module Info ------ */

MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
MODULE_LICENSE("GPL");
Commit	Line	Data
93aead46 IE	1	/*
	2	* Texas Instrument's NFC Driver For Shared Transport.
	3	*
	4	* NFC Driver acts as interface between NCI core and
	5	* TI Shared Transport Layer.
	6	*
	7	* Copyright (C) 2011 Texas Instruments, Inc.
	8	*
	9	* Written by Ilan Elias <ilane@ti.com>
	10	*
	11	* Acknowledgements:
	12	* This file is based on btwilink.c, which was written
	13	* by Raja Mani and Pavan Savoy.
	14	*
	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of the GNU General Public License version 2 as
	17	* published by the Free Software Foundation.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
98b32dec	25	* along with this program; if not, see <http://www.gnu.org/licenses/>.
93aead46 IE	26	*
	27	*/
	28	#include <linux/platform_device.h>
baf79c33	29	#include <linux/module.h>
3ed1326d	30	#include <linux/types.h>
1195d89b	31	#include <linux/firmware.h>
93aead46 IE	32	#include <linux/nfc.h>
	33	#include <net/nfc/nci.h>
	34	#include <net/nfc/nci_core.h>
	35	#include <linux/ti_wilink_st.h>
	36
	37	#define NFCWILINK_CHNL 12
	38	#define NFCWILINK_OPCODE 7
	39	#define NFCWILINK_MAX_FRAME_SIZE 300
	40	#define NFCWILINK_HDR_LEN 4
	41	#define NFCWILINK_OFFSET_LEN_IN_HDR 1
	42	#define NFCWILINK_LEN_SIZE 2
	43	#define NFCWILINK_REGISTER_TIMEOUT 8000 /* 8 sec */
1195d89b IE	44	#define NFCWILINK_CMD_TIMEOUT 5000 /* 5 sec */
	45
	46	#define BTS_FILE_NAME_MAX_SIZE 40
	47	#define BTS_FILE_HDR_MAGIC 0x42535442
	48	#define BTS_FILE_CMD_MAX_LEN 0xff
	49	#define BTS_FILE_ACTION_TYPE_SEND_CMD 1
	50
	51	#define NCI_VS_NFCC_INFO_CMD_GID 0x2f
	52	#define NCI_VS_NFCC_INFO_CMD_OID 0x12
	53	#define NCI_VS_NFCC_INFO_RSP_GID 0x4f
	54	#define NCI_VS_NFCC_INFO_RSP_OID 0x12
93aead46 IE	55
93aead46 IE	56	struct nfcwilink_hdr {
3ed1326d IE	57	__u8 chnl;
	58	__u8 opcode;
	59	__le16 len;
93aead46 IE	60	} __packed;
93aead46 IE	61
1195d89b IE	62	struct nci_vs_nfcc_info_cmd {
	63	__u8 gid;
	64	__u8 oid;
	65	__u8 plen;
	66	} __packed;
	67
	68	struct nci_vs_nfcc_info_rsp {
	69	__u8 gid;
	70	__u8 oid;
	71	__u8 plen;
	72	__u8 status;
	73	__u8 hw_id;
	74	__u8 sw_ver_x;
	75	__u8 sw_ver_z;
	76	__u8 patch_id;
	77	} __packed;
	78
	79	struct bts_file_hdr {
	80	__le32 magic;
	81	__le32 ver;
	82	__u8 rfu[24];
	83	__u8 actions[0];
	84	} __packed;
	85
	86	struct bts_file_action {
	87	__le16 type;
	88	__le16 len;
	89	__u8 data[0];
	90	} __packed;
	91
93aead46 IE	92	struct nfcwilink {
	93	struct platform_device *pdev;
	94	struct nci_dev *ndev;
	95	unsigned long flags;
	96
4360fa22	97	int st_register_cb_status;
93aead46	98	long (st_write) (struct sk_buff );
1195d89b IE	99
	100	struct completion completed;
	101
	102	struct nci_vs_nfcc_info_rsp nfcc_info;
93aead46 IE	103	};
	104
	105	/* NFCWILINK driver flags */
	106	enum {
	107	NFCWILINK_RUNNING,
1195d89b	108	NFCWILINK_FW_DOWNLOAD,
93aead46 IE	109	};
93aead46 IE	110
1095e69f	111	static int nfcwilink_send(struct nci_dev ndev, struct sk_buff skb);
1195d89b IE	112
	113	static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
	114	{
	115	struct sk_buff *skb;
	116
	117	skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
	118	if (skb)
	119	skb_reserve(skb, NFCWILINK_HDR_LEN);
	120
	121	return skb;
	122	}
	123
	124	static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
	125	struct sk_buff *skb)
	126	{
	127	struct nci_vs_nfcc_info_rsp rsp = (void )skb->data;
	128
	129	/* Detect NCI_VS_NFCC_INFO_RSP and store the result */
	130	if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
	131	(rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
	132	memcpy(&drv->nfcc_info, rsp,
	133	sizeof(struct nci_vs_nfcc_info_rsp));
	134	}
	135
	136	kfree_skb(skb);
	137
	138	complete(&drv->completed);
	139	}
	140
	141	static int nfcwilink_get_bts_file_name(struct nfcwilink drv, char file_name)
	142	{
	143	struct nci_vs_nfcc_info_cmd *cmd;
	144	struct sk_buff *skb;
	145	unsigned long comp_ret;
	146	int rc;
	147
1195d89b IE	148	skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
	149	GFP_KERNEL);
	150	if (!skb) {
073a625f JP	151	nfc_err(&drv->pdev->dev,
073a625f JP	152	"no memory for nci_vs_nfcc_info_cmd\n");
1195d89b IE	153	return -ENOMEM;
	154	}
	155
1195d89b IE	156	cmd = (struct nci_vs_nfcc_info_cmd *)
	157	skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
	158	cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
	159	cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
	160	cmd->plen = 0;
	161
	162	drv->nfcc_info.plen = 0;
	163
1095e69f	164	rc = nfcwilink_send(drv->ndev, skb);
1195d89b IE	165	if (rc)
	166	return rc;
	167
	168	comp_ret = wait_for_completion_timeout(&drv->completed,
	169	msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
b4834839 JP	170	dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld\n",
b4834839 JP	171	comp_ret);
1195d89b	172	if (comp_ret == 0) {
17936b43	173	nfc_err(&drv->pdev->dev,
b4834839	174	"timeout on wait_for_completion_timeout\n");
1195d89b IE	175	return -ETIMEDOUT;
	176	}
	177
b4834839 JP	178	dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d\n",
b4834839 JP	179	drv->nfcc_info.plen, drv->nfcc_info.status);
1195d89b IE	180
1195d89b IE	181	if ((drv->nfcc_info.plen != 5) \|\| (drv->nfcc_info.status != 0)) {
073a625f	182	nfc_err(&drv->pdev->dev, "invalid nci_vs_nfcc_info_rsp\n");
1195d89b IE	183	return -EINVAL;
	184	}
	185
	186	snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
	187	"TINfcInit_%d.%d.%d.%d.bts",
	188	drv->nfcc_info.hw_id,
	189	drv->nfcc_info.sw_ver_x,
	190	drv->nfcc_info.sw_ver_z,
	191	drv->nfcc_info.patch_id);
	192
073a625f	193	nfc_info(&drv->pdev->dev, "nfcwilink FW file name: %s\n", file_name);
1195d89b IE	194
	195	return 0;
	196	}
	197
	198	static int nfcwilink_send_bts_cmd(struct nfcwilink drv, __u8 data, int len)
	199	{
	200	struct nfcwilink_hdr hdr = (struct nfcwilink_hdr )data;
	201	struct sk_buff *skb;
	202	unsigned long comp_ret;
	203	int rc;
	204
1195d89b IE	205	/* verify valid cmd for the NFC channel */
	206	if ((len <= sizeof(struct nfcwilink_hdr)) \|\|
	207	(len > BTS_FILE_CMD_MAX_LEN) \|\|
	208	(hdr->chnl != NFCWILINK_CHNL) \|\|
	209	(hdr->opcode != NFCWILINK_OPCODE)) {
073a625f JP	210	nfc_err(&drv->pdev->dev,
073a625f JP	211	"ignoring invalid bts cmd, len %d, chnl %d, opcode %d\n",
1195d89b IE	212	len, hdr->chnl, hdr->opcode);
	213	return 0;
	214	}
	215
	216	/* remove the ST header */
	217	len -= sizeof(struct nfcwilink_hdr);
	218	data += sizeof(struct nfcwilink_hdr);
	219
	220	skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
	221	if (!skb) {
073a625f	222	nfc_err(&drv->pdev->dev, "no memory for bts cmd\n");
1195d89b IE	223	return -ENOMEM;
	224	}
	225
1195d89b IE	226	memcpy(skb_put(skb, len), data, len);
1195d89b IE	227
1095e69f	228	rc = nfcwilink_send(drv->ndev, skb);
1195d89b IE	229	if (rc)
	230	return rc;
	231
	232	comp_ret = wait_for_completion_timeout(&drv->completed,
	233	msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
b4834839 JP	234	dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld\n",
b4834839 JP	235	comp_ret);
1195d89b	236	if (comp_ret == 0) {
073a625f JP	237	nfc_err(&drv->pdev->dev,
073a625f JP	238	"timeout on wait_for_completion_timeout\n");
1195d89b IE	239	return -ETIMEDOUT;
	240	}
	241
	242	return 0;
	243	}
	244
	245	static int nfcwilink_download_fw(struct nfcwilink *drv)
	246	{
	247	unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
	248	const struct firmware *fw;
	249	__u16 action_type, action_len;
	250	__u8 *ptr;
	251	int len, rc;
	252
1195d89b IE	253	set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
	254
	255	rc = nfcwilink_get_bts_file_name(drv, file_name);
	256	if (rc)
	257	goto exit;
	258
	259	rc = request_firmware(&fw, file_name, &drv->pdev->dev);
	260	if (rc) {
073a625f	261	nfc_err(&drv->pdev->dev, "request_firmware failed %d\n", rc);
1195d89b IE	262
	263	/* if the file is not found, don't exit with failure */
	264	if (rc == -ENOENT)
	265	rc = 0;
	266
	267	goto exit;
	268	}
	269
	270	len = fw->size;
	271	ptr = (__u8 *)fw->data;
	272
	273	if ((len == 0) \|\| (ptr == NULL)) {
b4834839 JP	274	dev_dbg(&drv->pdev->dev,
b4834839 JP	275	"request_firmware returned size %d\n", len);
1195d89b IE	276	goto release_fw;
	277	}
	278
	279	if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
	280	BTS_FILE_HDR_MAGIC) {
073a625f	281	nfc_err(&drv->pdev->dev, "wrong bts magic number\n");
1195d89b IE	282	rc = -EINVAL;
	283	goto release_fw;
	284	}
	285
	286	/* remove the BTS header */
	287	len -= sizeof(struct bts_file_hdr);
	288	ptr += sizeof(struct bts_file_hdr);
	289
	290	while (len > 0) {
	291	action_type =
	292	__le16_to_cpu(((struct bts_file_action *)ptr)->type);
	293	action_len =
	294	__le16_to_cpu(((struct bts_file_action *)ptr)->len);
	295
b4834839 JP	296	dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d\n",
b4834839 JP	297	action_type, action_len);
1195d89b IE	298
	299	switch (action_type) {
	300	case BTS_FILE_ACTION_TYPE_SEND_CMD:
	301	rc = nfcwilink_send_bts_cmd(drv,
	302	((struct bts_file_action *)ptr)->data,
	303	action_len);
	304	if (rc)
	305	goto release_fw;
	306	break;
	307	}
	308
	309	/* advance to the next action */
	310	len -= (sizeof(struct bts_file_action) + action_len);
	311	ptr += (sizeof(struct bts_file_action) + action_len);
	312	}
	313
	314	release_fw:
	315	release_firmware(fw);
	316
	317	exit:
	318	clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
	319	return rc;
	320	}
	321
93aead46	322	/* Called by ST when registration is complete */
4360fa22	323	static void nfcwilink_register_complete(void *priv_data, int data)
93aead46 IE	324	{
	325	struct nfcwilink *drv = priv_data;
	326
93aead46 IE	327	/* store ST registration status */
	328	drv->st_register_cb_status = data;
	329
	330	/* complete the wait in nfc_st_open() */
1195d89b	331	complete(&drv->completed);
93aead46 IE	332	}
	333
	334	/* Called by ST when receive data is available */
	335	static long nfcwilink_receive(void priv_data, struct sk_buff skb)
	336	{
	337	struct nfcwilink *drv = priv_data;
	338	int rc;
	339
93aead46 IE	340	if (!skb)
	341	return -EFAULT;
	342
	343	if (!drv) {
	344	kfree_skb(skb);
	345	return -EFAULT;
	346	}
	347
b4834839	348	dev_dbg(&drv->pdev->dev, "receive entry, len %d\n", skb->len);
d6650a2c	349
93aead46 IE	350	/* strip the ST header
	351	(apart for the chnl byte, which is not received in the hdr) */
	352	skb_pull(skb, (NFCWILINK_HDR_LEN-1));
	353
1195d89b IE	354	if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
	355	nfcwilink_fw_download_receive(drv, skb);
	356	return 0;
	357	}
	358
93aead46	359	/* Forward skb to NCI core layer */
1095e69f	360	rc = nci_recv_frame(drv->ndev, skb);
93aead46	361	if (rc < 0) {
073a625f	362	nfc_err(&drv->pdev->dev, "nci_recv_frame failed %d\n", rc);
93aead46 IE	363	return rc;
	364	}
	365
	366	return 0;
	367	}
	368
	369	/* protocol structure registered with ST */
	370	static struct st_proto_s nfcwilink_proto = {
	371	.chnl_id = NFCWILINK_CHNL,
	372	.max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
	373	.hdr_len = (NFCWILINK_HDR_LEN-1), /* not including chnl byte */
	374	.offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
	375	.len_size = NFCWILINK_LEN_SIZE,
	376	.reserve = 0,
	377	.recv = nfcwilink_receive,
	378	.reg_complete_cb = nfcwilink_register_complete,
	379	.write = NULL,
	380	};
	381
	382	static int nfcwilink_open(struct nci_dev *ndev)
	383	{
	384	struct nfcwilink *drv = nci_get_drvdata(ndev);
	385	unsigned long comp_ret;
	386	int rc;
	387
93aead46 IE	388	if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
	389	rc = -EBUSY;
	390	goto exit;
	391	}
	392
	393	nfcwilink_proto.priv_data = drv;
	394
1195d89b	395	init_completion(&drv->completed);
93aead46 IE	396	drv->st_register_cb_status = -EINPROGRESS;
	397
	398	rc = st_register(&nfcwilink_proto);
	399	if (rc < 0) {
	400	if (rc == -EINPROGRESS) {
	401	comp_ret = wait_for_completion_timeout(
1195d89b	402	&drv->completed,
93aead46 IE	403	msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));
93aead46 IE	404
b4834839 JP	405	dev_dbg(&drv->pdev->dev,
	406	"wait_for_completion_timeout returned %ld\n",
	407	comp_ret);
93aead46 IE	408
	409	if (comp_ret == 0) {
	410	/* timeout */
	411	rc = -ETIMEDOUT;
	412	goto clear_exit;
	413	} else if (drv->st_register_cb_status != 0) {
	414	rc = drv->st_register_cb_status;
073a625f JP	415	nfc_err(&drv->pdev->dev,
073a625f JP	416	"st_register_cb failed %d\n", rc);
93aead46 IE	417	goto clear_exit;
	418	}
	419	} else {
073a625f	420	nfc_err(&drv->pdev->dev, "st_register failed %d\n", rc);
93aead46 IE	421	goto clear_exit;
	422	}
	423	}
	424
	425	/* st_register MUST fill the write callback */
	426	BUG_ON(nfcwilink_proto.write == NULL);
	427	drv->st_write = nfcwilink_proto.write;
	428
1195d89b	429	if (nfcwilink_download_fw(drv)) {
073a625f JP	430	nfc_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d\n",
073a625f JP	431	rc);
1195d89b IE	432	/* open should succeed, even if the FW download failed */
	433	}
	434
93aead46 IE	435	goto exit;
	436
	437	clear_exit:
	438	clear_bit(NFCWILINK_RUNNING, &drv->flags);
	439
	440	exit:
	441	return rc;
	442	}
	443
	444	static int nfcwilink_close(struct nci_dev *ndev)
	445	{
	446	struct nfcwilink *drv = nci_get_drvdata(ndev);
	447	int rc;
	448
93aead46 IE	449	if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
	450	return 0;
	451
	452	rc = st_unregister(&nfcwilink_proto);
	453	if (rc)
073a625f	454	nfc_err(&drv->pdev->dev, "st_unregister failed %d\n", rc);
93aead46 IE	455
	456	drv->st_write = NULL;
	457
	458	return rc;
	459	}
	460
1095e69f	461	static int nfcwilink_send(struct nci_dev ndev, struct sk_buff skb)
93aead46	462	{
93aead46 IE	463	struct nfcwilink *drv = nci_get_drvdata(ndev);
	464	struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
	465	long len;
	466
b4834839	467	dev_dbg(&drv->pdev->dev, "send entry, len %d\n", skb->len);
93aead46	468
ea9917d6 IE	469	if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) {
	470	kfree_skb(skb);
	471	return -EINVAL;
	472	}
93aead46 IE	473
93aead46 IE	474	/* add the ST hdr to the start of the buffer */
3ed1326d	475	hdr.len = cpu_to_le16(skb->len);
93aead46 IE	476	memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);
	477
	478	/* Insert skb to shared transport layer's transmit queue.
	479	* Freeing skb memory is taken care in shared transport layer,
	480	* so don't free skb memory here.
	481	*/
	482	len = drv->st_write(skb);
	483	if (len < 0) {
	484	kfree_skb(skb);
073a625f	485	nfc_err(&drv->pdev->dev, "st_write failed %ld\n", len);
93aead46 IE	486	return -EFAULT;
	487	}
	488
	489	return 0;
	490	}
	491
	492	static struct nci_ops nfcwilink_ops = {
	493	.open = nfcwilink_open,
	494	.close = nfcwilink_close,
	495	.send = nfcwilink_send,
	496	};
	497
	498	static int nfcwilink_probe(struct platform_device *pdev)
	499	{
b43ef781	500	struct nfcwilink *drv;
93aead46	501	int rc;
3ed1326d	502	__u32 protocols;
93aead46	503
5f4d6214	504	drv = devm_kzalloc(&pdev->dev, sizeof(struct nfcwilink), GFP_KERNEL);
93aead46 IE	505	if (!drv) {
	506	rc = -ENOMEM;
	507	goto exit;
	508	}
	509
	510	drv->pdev = pdev;
	511
	512	protocols = NFC_PROTO_JEWEL_MASK
01d719a2 SO	513	\| NFC_PROTO_MIFARE_MASK \| NFC_PROTO_FELICA_MASK
	514	\| NFC_PROTO_ISO14443_MASK
	515	\| NFC_PROTO_ISO14443_B_MASK
	516	\| NFC_PROTO_NFC_DEP_MASK;
93aead46 IE	517
	518	drv->ndev = nci_allocate_device(&nfcwilink_ops,
	519	protocols,
	520	NFCWILINK_HDR_LEN,
	521	0);
	522	if (!drv->ndev) {
073a625f	523	nfc_err(&pdev->dev, "nci_allocate_device failed\n");
93aead46	524	rc = -ENOMEM;
5f4d6214	525	goto exit;
93aead46 IE	526	}
	527
	528	nci_set_parent_dev(drv->ndev, &pdev->dev);
	529	nci_set_drvdata(drv->ndev, drv);
	530
	531	rc = nci_register_device(drv->ndev);
	532	if (rc < 0) {
073a625f	533	nfc_err(&pdev->dev, "nci_register_device failed %d\n", rc);
93aead46 IE	534	goto free_dev_exit;
	535	}
	536
	537	dev_set_drvdata(&pdev->dev, drv);
	538
	539	goto exit;
	540
	541	free_dev_exit:
	542	nci_free_device(drv->ndev);
	543
93aead46 IE	544	exit:
	545	return rc;
	546	}
	547
	548	static int nfcwilink_remove(struct platform_device *pdev)
	549	{
	550	struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
	551	struct nci_dev *ndev;
	552
93aead46 IE	553	if (!drv)
	554	return -EFAULT;
	555
	556	ndev = drv->ndev;
	557
	558	nci_unregister_device(ndev);
	559	nci_free_device(ndev);
	560
93aead46 IE	561	return 0;
	562	}
	563
	564	static struct platform_driver nfcwilink_driver = {
	565	.probe = nfcwilink_probe,
	566	.remove = nfcwilink_remove,
	567	.driver = {
	568	.name = "nfcwilink",
93aead46 IE	569	},
	570	};
	571
058576dd	572	module_platform_driver(nfcwilink_driver);
93aead46 IE	573
	574	/* ------ Module Info ------ */
	575
	576	MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
	577	MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
	578	MODULE_LICENSE("GPL");