1 files changed, 578 insertions, 0 deletions

diff --git a/drivers/nfc/nfcwilink.c b/drivers/nfc/nfcwilink.c
new file mode 100644
index 0000000..3fbd18b
--- /dev/null
+++ b/drivers/nfc/nfcwilink.c
@@ -0,0 +1,578 @@
+/*
+ *  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");