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linux-7.2.3/drivers/nfc/fdp/Kconfig

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config NFC_FDP
+	tristate "Intel FDP NFC driver"
+	depends on NFC_NCI
+	select CRC_CCITT
+	default n
+	help
+	  Intel Fields Peak NFC controller core driver.
+	  This is a driver based on the NCI NFC kernel layers.
+
+	  To compile this driver as a module, choose m here. The module will
+	  be called fdp.
+	  Say N if unsure.
+
+config NFC_FDP_I2C
+	tristate "NFC FDP i2c support"
+	depends on NFC_FDP && I2C
+	help
+	  This module adds support for the Intel Fields Peak NFC controller
+	  i2c interface.
+	  Select this if your platform is using the i2c bus.
+
+	  If you choose to build a module, it'll be called fdp_i2c.
+	  Say N if unsure.

linux-7.2.3/drivers/nfc/fdp/Makefile

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for FDP NCI based NFC driver
+#
+
+obj-$(CONFIG_NFC_FDP)     += fdp.o
+obj-$(CONFIG_NFC_FDP_I2C) += fdp_i2c.o
+
+fdp_i2c-objs  = i2c.o
+

linux-7.2.3/drivers/nfc/fdp/fdp.c

@@ -0,0 +1,767 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* -------------------------------------------------------------------------
+ * Copyright (C) 2014-2016, Intel Corporation
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <net/nfc/nci_core.h>
+
+#include "fdp.h"
+
+#define FDP_OTP_PATCH_NAME			"otp.bin"
+#define FDP_RAM_PATCH_NAME			"ram.bin"
+#define FDP_FW_HEADER_SIZE			576
+#define FDP_FW_UPDATE_SLEEP			1000
+
+#define NCI_GET_VERSION_TIMEOUT			8000
+#define NCI_PATCH_REQUEST_TIMEOUT		8000
+#define FDP_PATCH_CONN_DEST			0xC2
+#define FDP_PATCH_CONN_PARAM_TYPE		0xA0
+
+#define NCI_PATCH_TYPE_RAM			0x00
+#define NCI_PATCH_TYPE_OTP			0x01
+#define NCI_PATCH_TYPE_EOT			0xFF
+
+#define NCI_PARAM_ID_FW_RAM_VERSION		0xA0
+#define NCI_PARAM_ID_FW_OTP_VERSION		0xA1
+#define NCI_PARAM_ID_OTP_LIMITED_VERSION	0xC5
+#define NCI_PARAM_ID_KEY_INDEX_ID		0xC6
+
+#define NCI_GID_PROP				0x0F
+#define NCI_OP_PROP_PATCH_OID			0x08
+#define NCI_OP_PROP_SET_PDATA_OID		0x23
+
+struct fdp_nci_info {
+	const struct nfc_phy_ops *phy_ops;
+	struct fdp_i2c_phy *phy;
+	struct nci_dev *ndev;
+
+	const struct firmware *otp_patch;
+	const struct firmware *ram_patch;
+	u32 otp_patch_version;
+	u32 ram_patch_version;
+
+	u32 otp_version;
+	u32 ram_version;
+	u32 limited_otp_version;
+	u8 key_index;
+
+	const u8 *fw_vsc_cfg;
+	u8 clock_type;
+	u32 clock_freq;
+
+	atomic_t data_pkt_counter;
+	void (*data_pkt_counter_cb)(struct nci_dev *ndev);
+	u8 setup_patch_sent;
+	u8 setup_patch_ntf;
+	u8 setup_patch_status;
+	u8 setup_reset_ntf;
+	wait_queue_head_t setup_wq;
+};
+
+static const u8 nci_core_get_config_otp_ram_version[5] = {
+	0x04,
+	NCI_PARAM_ID_FW_RAM_VERSION,
+	NCI_PARAM_ID_FW_OTP_VERSION,
+	NCI_PARAM_ID_OTP_LIMITED_VERSION,
+	NCI_PARAM_ID_KEY_INDEX_ID
+};
+
+struct nci_core_get_config_rsp {
+	u8 status;
+	u8 count;
+	u8 data[];
+};
+
+static int fdp_nci_create_conn(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct core_conn_create_dest_spec_params param;
+	int r;
+
+	/* proprietary destination specific paramerer without value */
+	param.type = FDP_PATCH_CONN_PARAM_TYPE;
+	param.length = 0x00;
+
+	r = nci_core_conn_create(info->ndev, FDP_PATCH_CONN_DEST, 1,
+				 sizeof(param), &param);
+	if (r)
+		return r;
+
+	return nci_get_conn_info_by_dest_type_params(ndev,
+						     FDP_PATCH_CONN_DEST, NULL);
+}
+
+static inline int fdp_nci_get_versions(struct nci_dev *ndev)
+{
+	return nci_core_cmd(ndev, NCI_OP_CORE_GET_CONFIG_CMD,
+			    sizeof(nci_core_get_config_otp_ram_version),
+			    (__u8 *) &nci_core_get_config_otp_ram_version);
+}
+
+static inline int fdp_nci_patch_cmd(struct nci_dev *ndev, u8 type)
+{
+	return nci_prop_cmd(ndev, NCI_OP_PROP_PATCH_OID, sizeof(type), &type);
+}
+
+static inline int fdp_nci_set_production_data(struct nci_dev *ndev, u8 len,
+					      const char *data)
+{
+	return nci_prop_cmd(ndev, NCI_OP_PROP_SET_PDATA_OID, len, data);
+}
+
+static int fdp_nci_set_clock(struct nci_dev *ndev, u8 clock_type,
+			     u32 clock_freq)
+{
+	u32 fc = 13560;
+	u32 nd, num, delta;
+	char data[9];
+
+	nd = (24 * fc) / clock_freq;
+	delta = 24 * fc - nd * clock_freq;
+	num = (32768 * delta) / clock_freq;
+
+	data[0] = 0x00;
+	data[1] = 0x00;
+	data[2] = 0x00;
+
+	data[3] = 0x10;
+	data[4] = 0x04;
+	data[5] = num & 0xFF;
+	data[6] = (num >> 8) & 0xff;
+	data[7] = nd;
+	data[8] = clock_type;
+
+	return fdp_nci_set_production_data(ndev, 9, data);
+}
+
+static void fdp_nci_send_patch_cb(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+
+	info->setup_patch_sent = 1;
+	wake_up(&info->setup_wq);
+}
+
+/*
+ * Register a packet sent counter and a callback
+ *
+ * We have no other way of knowing when all firmware packets were sent out
+ * on the i2c bus. We need to know that in order to close the connection and
+ * send the patch end message.
+ */
+static void fdp_nci_set_data_pkt_counter(struct nci_dev *ndev,
+				  void (*cb)(struct nci_dev *ndev), int count)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+
+	dev_dbg(dev, "NCI data pkt counter %d\n", count);
+	atomic_set(&info->data_pkt_counter, count);
+	info->data_pkt_counter_cb = cb;
+}
+
+/*
+ * The device is expecting a stream of packets. All packets need to
+ * have the PBF flag set to 0x0 (last packet) even if the firmware
+ * file is segmented and there are multiple packets. If we give the
+ * whole firmware to nci_send_data it will segment it and it will set
+ * the PBF flag to 0x01 so we need to do the segmentation here.
+ *
+ * The firmware will be analyzed and applied when we send NCI_OP_PROP_PATCH_CMD
+ * command with NCI_PATCH_TYPE_EOT parameter. The device will send a
+ * NFCC_PATCH_NTF packet and a NCI_OP_CORE_RESET_NTF packet.
+ */
+static int fdp_nci_send_patch(struct nci_dev *ndev, u8 conn_id, u8 type)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	const struct firmware *fw;
+	struct sk_buff *skb;
+	unsigned long len;
+	int max_size, payload_size;
+	int rc = 0;
+
+	if ((type == NCI_PATCH_TYPE_OTP && !info->otp_patch) ||
+	    (type == NCI_PATCH_TYPE_RAM && !info->ram_patch))
+		return -EINVAL;
+
+	if (type == NCI_PATCH_TYPE_OTP)
+		fw = info->otp_patch;
+	else
+		fw = info->ram_patch;
+
+	max_size = nci_conn_max_data_pkt_payload_size(ndev, conn_id);
+	if (max_size <= 0)
+		return -EINVAL;
+
+	len = fw->size;
+
+	fdp_nci_set_data_pkt_counter(ndev, fdp_nci_send_patch_cb,
+				     DIV_ROUND_UP(fw->size, max_size));
+
+	while (len) {
+
+		payload_size = min_t(unsigned long, max_size, len);
+
+		skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + payload_size),
+				    GFP_KERNEL);
+		if (!skb) {
+			fdp_nci_set_data_pkt_counter(ndev, NULL, 0);
+			return -ENOMEM;
+		}
+
+
+		skb_reserve(skb, NCI_CTRL_HDR_SIZE);
+
+		skb_put_data(skb, fw->data + (fw->size - len), payload_size);
+
+		rc = nci_send_data(ndev, conn_id, skb);
+
+		if (rc) {
+			fdp_nci_set_data_pkt_counter(ndev, NULL, 0);
+			return rc;
+		}
+
+		len -= payload_size;
+	}
+
+	return rc;
+}
+
+static int fdp_nci_open(struct nci_dev *ndev)
+{
+	const struct fdp_nci_info *info = nci_get_drvdata(ndev);
+
+	return info->phy_ops->enable(info->phy);
+}
+
+static int fdp_nci_close(struct nci_dev *ndev)
+{
+	return 0;
+}
+
+static int fdp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	int ret;
+
+	if (atomic_dec_and_test(&info->data_pkt_counter))
+		info->data_pkt_counter_cb(ndev);
+
+	ret = info->phy_ops->write(info->phy, skb);
+	if (ret < 0) {
+		kfree_skb(skb);
+		return ret;
+	}
+
+	consume_skb(skb);
+	return 0;
+}
+
+static int fdp_nci_request_firmware(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	const u8 *data;
+	int r;
+
+	r = request_firmware(&info->ram_patch, FDP_RAM_PATCH_NAME, dev);
+	if (r < 0) {
+		nfc_err(dev, "RAM patch request error\n");
+		return r;
+	}
+
+	data = info->ram_patch->data;
+	info->ram_patch_version =
+		data[FDP_FW_HEADER_SIZE] |
+		(data[FDP_FW_HEADER_SIZE + 1] << 8) |
+		(data[FDP_FW_HEADER_SIZE + 2] << 16) |
+		(data[FDP_FW_HEADER_SIZE + 3] << 24);
+
+	dev_dbg(dev, "RAM patch version: %d, size: %zu\n",
+		  info->ram_patch_version, info->ram_patch->size);
+
+
+	r = request_firmware(&info->otp_patch, FDP_OTP_PATCH_NAME, dev);
+	if (r < 0) {
+		nfc_err(dev, "OTP patch request error\n");
+		return 0;
+	}
+
+	data = (u8 *) info->otp_patch->data;
+	info->otp_patch_version =
+		data[FDP_FW_HEADER_SIZE] |
+		(data[FDP_FW_HEADER_SIZE + 1] << 8) |
+		(data[FDP_FW_HEADER_SIZE+2] << 16) |
+		(data[FDP_FW_HEADER_SIZE+3] << 24);
+
+	dev_dbg(dev, "OTP patch version: %d, size: %zu\n",
+		 info->otp_patch_version, info->otp_patch->size);
+	return 0;
+}
+
+static void fdp_nci_release_firmware(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+
+	if (info->otp_patch) {
+		release_firmware(info->otp_patch);
+		info->otp_patch = NULL;
+	}
+
+	if (info->ram_patch) {
+		release_firmware(info->ram_patch);
+		info->ram_patch = NULL;
+	}
+}
+
+static int fdp_nci_patch_otp(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	int conn_id;
+	int r = 0;
+
+	if (info->otp_version >= info->otp_patch_version)
+		return r;
+
+	info->setup_patch_sent = 0;
+	info->setup_reset_ntf = 0;
+	info->setup_patch_ntf = 0;
+
+	/* Patch init request */
+	r = fdp_nci_patch_cmd(ndev, NCI_PATCH_TYPE_OTP);
+	if (r)
+		return r;
+
+	/* Patch data connection creation */
+	conn_id = fdp_nci_create_conn(ndev);
+	if (conn_id < 0)
+		return conn_id;
+
+	/* Send the patch over the data connection */
+	r = fdp_nci_send_patch(ndev, conn_id, NCI_PATCH_TYPE_OTP);
+	if (r)
+		return r;
+
+	/* Wait for all the packets to be send over i2c */
+	wait_event_interruptible(info->setup_wq,
+				 info->setup_patch_sent == 1);
+
+	/* make sure that the NFCC processed the last data packet */
+	msleep(FDP_FW_UPDATE_SLEEP);
+
+	/* Close the data connection */
+	r = nci_core_conn_close(info->ndev, conn_id);
+	if (r)
+		return r;
+
+	/* Patch finish message */
+	if (fdp_nci_patch_cmd(ndev, NCI_PATCH_TYPE_EOT)) {
+		nfc_err(dev, "OTP patch error 0x%x\n", r);
+		return -EINVAL;
+	}
+
+	/* If the patch notification didn't arrive yet, wait for it */
+	wait_event_interruptible(info->setup_wq, info->setup_patch_ntf);
+
+	/* Check if the patching was successful */
+	r = info->setup_patch_status;
+	if (r) {
+		nfc_err(dev, "OTP patch error 0x%x\n", r);
+		return -EINVAL;
+	}
+
+	/*
+	 * We need to wait for the reset notification before we
+	 * can continue
+	 */
+	wait_event_interruptible(info->setup_wq, info->setup_reset_ntf);
+
+	return r;
+}
+
+static int fdp_nci_patch_ram(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	int conn_id;
+	int r = 0;
+
+	if (info->ram_version >= info->ram_patch_version)
+		return r;
+
+	info->setup_patch_sent = 0;
+	info->setup_reset_ntf = 0;
+	info->setup_patch_ntf = 0;
+
+	/* Patch init request */
+	r = fdp_nci_patch_cmd(ndev, NCI_PATCH_TYPE_RAM);
+	if (r)
+		return r;
+
+	/* Patch data connection creation */
+	conn_id = fdp_nci_create_conn(ndev);
+	if (conn_id < 0)
+		return conn_id;
+
+	/* Send the patch over the data connection */
+	r = fdp_nci_send_patch(ndev, conn_id, NCI_PATCH_TYPE_RAM);
+	if (r)
+		return r;
+
+	/* Wait for all the packets to be send over i2c */
+	wait_event_interruptible(info->setup_wq,
+				 info->setup_patch_sent == 1);
+
+	/* make sure that the NFCC processed the last data packet */
+	msleep(FDP_FW_UPDATE_SLEEP);
+
+	/* Close the data connection */
+	r = nci_core_conn_close(info->ndev, conn_id);
+	if (r)
+		return r;
+
+	/* Patch finish message */
+	if (fdp_nci_patch_cmd(ndev, NCI_PATCH_TYPE_EOT)) {
+		nfc_err(dev, "RAM patch error 0x%x\n", r);
+		return -EINVAL;
+	}
+
+	/* If the patch notification didn't arrive yet, wait for it */
+	wait_event_interruptible(info->setup_wq, info->setup_patch_ntf);
+
+	/* Check if the patching was successful */
+	r = info->setup_patch_status;
+	if (r) {
+		nfc_err(dev, "RAM patch error 0x%x\n", r);
+		return -EINVAL;
+	}
+
+	/*
+	 * We need to wait for the reset notification before we
+	 * can continue
+	 */
+	wait_event_interruptible(info->setup_wq, info->setup_reset_ntf);
+
+	return r;
+}
+
+static int fdp_nci_setup(struct nci_dev *ndev)
+{
+	/* Format: total length followed by an NCI packet */
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	int r;
+	u8 patched = 0;
+
+	r = nci_core_init(ndev);
+	if (r)
+		goto error;
+
+	/* Get RAM and OTP version */
+	r = fdp_nci_get_versions(ndev);
+	if (r)
+		goto error;
+
+	/* Load firmware from disk */
+	r = fdp_nci_request_firmware(ndev);
+	if (r)
+		goto error;
+
+	/* Update OTP */
+	if (info->otp_version < info->otp_patch_version) {
+		r = fdp_nci_patch_otp(ndev);
+		if (r)
+			goto error;
+		patched = 1;
+	}
+
+	/* Update RAM */
+	if (info->ram_version < info->ram_patch_version) {
+		r = fdp_nci_patch_ram(ndev);
+		if (r)
+			goto error;
+		patched = 1;
+	}
+
+	/* Release the firmware buffers */
+	fdp_nci_release_firmware(ndev);
+
+	/* If a patch was applied the new version is checked */
+	if (patched) {
+		r = nci_core_init(ndev);
+		if (r)
+			goto error;
+
+		r = fdp_nci_get_versions(ndev);
+		if (r)
+			goto error;
+
+		if (info->otp_version != info->otp_patch_version ||
+		    info->ram_version != info->ram_patch_version) {
+			nfc_err(dev, "Firmware update failed");
+			r = -EINVAL;
+			goto error;
+		}
+	}
+
+	/*
+	 * We initialized the devices but the NFC subsystem expects
+	 * it to not be initialized.
+	 */
+	return nci_core_reset(ndev);
+
+error:
+	fdp_nci_release_firmware(ndev);
+	nfc_err(dev, "Setup error %d\n", r);
+	return r;
+}
+
+static int fdp_nci_post_setup(struct nci_dev *ndev)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	int r;
+
+	/* Check if the device has VSC */
+	if (info->fw_vsc_cfg && info->fw_vsc_cfg[0]) {
+
+		/* Set the vendor specific configuration */
+		r = fdp_nci_set_production_data(ndev, info->fw_vsc_cfg[3],
+						&info->fw_vsc_cfg[4]);
+		if (r) {
+			nfc_err(dev, "Vendor specific config set error %d\n",
+				r);
+			return r;
+		}
+	}
+
+	/* Set clock type and frequency */
+	r = fdp_nci_set_clock(ndev, info->clock_type, info->clock_freq);
+	if (r) {
+		nfc_err(dev, "Clock set error %d\n", r);
+		return r;
+	}
+
+	/*
+	 * In order to apply the VSC FDP needs a reset
+	 */
+	r = nci_core_reset(ndev);
+	if (r)
+		return r;
+
+	/**
+	 * The nci core was initialized when post setup was called
+	 * so we leave it like that
+	 */
+	return nci_core_init(ndev);
+}
+
+static int fdp_nci_core_reset_ntf_packet(struct nci_dev *ndev,
+					  struct sk_buff *skb)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+
+	info->setup_reset_ntf = 1;
+	wake_up(&info->setup_wq);
+
+	return 0;
+}
+
+static int fdp_nci_prop_patch_ntf_packet(struct nci_dev *ndev,
+					  struct sk_buff *skb)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+
+	info->setup_patch_ntf = 1;
+	info->setup_patch_status = skb->data[0];
+	wake_up(&info->setup_wq);
+
+	return 0;
+}
+
+static int fdp_nci_prop_patch_rsp_packet(struct nci_dev *ndev,
+					  struct sk_buff *skb)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	u8 status = skb->data[0];
+
+	dev_dbg(dev, "%s: status 0x%x\n", __func__, status);
+	nci_req_complete(ndev, status);
+
+	return 0;
+}
+
+static int fdp_nci_prop_set_production_data_rsp_packet(struct nci_dev *ndev,
+							struct sk_buff *skb)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	u8 status = skb->data[0];
+
+	dev_dbg(dev, "%s: status 0x%x\n", __func__, status);
+	nci_req_complete(ndev, status);
+
+	return 0;
+}
+
+static int fdp_nci_core_get_config_rsp_packet(struct nci_dev *ndev,
+						struct sk_buff *skb)
+{
+	struct fdp_nci_info *info = nci_get_drvdata(ndev);
+	struct device *dev = &info->phy->i2c_dev->dev;
+	const struct nci_core_get_config_rsp *rsp = (void *) skb->data;
+	unsigned int i;
+	const u8 *p;
+
+	if (rsp->status == NCI_STATUS_OK) {
+
+		p = rsp->data;
+		for (i = 0; i < 4; i++) {
+
+			switch (*p++) {
+			case NCI_PARAM_ID_FW_RAM_VERSION:
+				p++;
+				info->ram_version = le32_to_cpup((__le32 *) p);
+				p += 4;
+				break;
+			case NCI_PARAM_ID_FW_OTP_VERSION:
+				p++;
+				info->otp_version = le32_to_cpup((__le32 *) p);
+				p += 4;
+				break;
+			case NCI_PARAM_ID_OTP_LIMITED_VERSION:
+				p++;
+				info->otp_version = le32_to_cpup((__le32 *) p);
+				p += 4;
+				break;
+			case NCI_PARAM_ID_KEY_INDEX_ID:
+				p++;
+				info->key_index = *p++;
+			}
+		}
+	}
+
+	dev_dbg(dev, "OTP version %d\n", info->otp_version);
+	dev_dbg(dev, "RAM version %d\n", info->ram_version);
+	dev_dbg(dev, "key index %d\n", info->key_index);
+	dev_dbg(dev, "%s: status 0x%x\n", __func__, rsp->status);
+
+	nci_req_complete(ndev, rsp->status);
+
+	return 0;
+}
+
+static const struct nci_driver_ops fdp_core_ops[] = {
+	{
+		.opcode = NCI_OP_CORE_GET_CONFIG_RSP,
+		.rsp = fdp_nci_core_get_config_rsp_packet,
+	},
+	{
+		.opcode = NCI_OP_CORE_RESET_NTF,
+		.ntf = fdp_nci_core_reset_ntf_packet,
+	},
+};
+
+static const struct nci_driver_ops fdp_prop_ops[] = {
+	{
+		.opcode = nci_opcode_pack(NCI_GID_PROP, NCI_OP_PROP_PATCH_OID),
+		.rsp = fdp_nci_prop_patch_rsp_packet,
+		.ntf = fdp_nci_prop_patch_ntf_packet,
+	},
+	{
+		.opcode = nci_opcode_pack(NCI_GID_PROP,
+					  NCI_OP_PROP_SET_PDATA_OID),
+		.rsp = fdp_nci_prop_set_production_data_rsp_packet,
+	},
+};
+
+static const struct nci_ops nci_ops = {
+	.open = fdp_nci_open,
+	.close = fdp_nci_close,
+	.send = fdp_nci_send,
+	.setup = fdp_nci_setup,
+	.post_setup = fdp_nci_post_setup,
+	.prop_ops = fdp_prop_ops,
+	.n_prop_ops = ARRAY_SIZE(fdp_prop_ops),
+	.core_ops = fdp_core_ops,
+	.n_core_ops = ARRAY_SIZE(fdp_core_ops),
+};
+
+int fdp_nci_probe(struct fdp_i2c_phy *phy, const struct nfc_phy_ops *phy_ops,
+			struct nci_dev **ndevp, int tx_headroom,
+			int tx_tailroom, u8 clock_type, u32 clock_freq,
+			const u8 *fw_vsc_cfg)
+{
+	struct device *dev = &phy->i2c_dev->dev;
+	struct fdp_nci_info *info;
+	struct nci_dev *ndev;
+	u32 protocols;
+	int r;
+
+	info = devm_kzalloc(dev, sizeof(struct fdp_nci_info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->phy = phy;
+	info->phy_ops = phy_ops;
+	info->clock_type = clock_type;
+	info->clock_freq = clock_freq;
+	info->fw_vsc_cfg = fw_vsc_cfg;
+
+	init_waitqueue_head(&info->setup_wq);
+
+	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 |
+		    NFC_PROTO_ISO15693_MASK;
+
+	BUILD_BUG_ON(ARRAY_SIZE(fdp_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
+	ndev = nci_allocate_device(&nci_ops, protocols, tx_headroom,
+				   tx_tailroom);
+	if (!ndev) {
+		nfc_err(dev, "Cannot allocate nfc ndev\n");
+		return -ENOMEM;
+	}
+
+	r = nci_register_device(ndev);
+	if (r)
+		goto err_regdev;
+
+	*ndevp = ndev;
+	info->ndev = ndev;
+
+	nci_set_drvdata(ndev, info);
+
+	return 0;
+
+err_regdev:
+	nci_free_device(ndev);
+	return r;
+}
+EXPORT_SYMBOL(fdp_nci_probe);
+
+void fdp_nci_remove(struct nci_dev *ndev)
+{
+	nci_unregister_device(ndev);
+	nci_free_device(ndev);
+}
+EXPORT_SYMBOL(fdp_nci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("NFC NCI driver for Intel Fields Peak NFC controller");
+MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
+
+MODULE_FIRMWARE(FDP_OTP_PATCH_NAME);
+MODULE_FIRMWARE(FDP_RAM_PATCH_NAME);

linux-7.2.3/drivers/nfc/fdp/fdp.h

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* -------------------------------------------------------------------------
+ * Copyright (C) 2014-2016, Intel Corporation
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#ifndef __LOCAL_FDP_H_
+#define __LOCAL_FDP_H_
+
+#include <net/nfc/nci_core.h>
+#include <linux/gpio/consumer.h>
+
+struct fdp_i2c_phy {
+	struct i2c_client *i2c_dev;
+	struct gpio_desc *power_gpio;
+	struct nci_dev *ndev;
+
+	/* < 0 if i2c error occurred */
+	int hard_fault;
+	uint16_t next_read_size;
+};
+
+int fdp_nci_probe(struct fdp_i2c_phy *phy, const struct nfc_phy_ops *phy_ops,
+		  struct nci_dev **ndev, int tx_headroom, int tx_tailroom,
+		  u8 clock_type, u32 clock_freq, const u8 *fw_vsc_cfg);
+void fdp_nci_remove(struct nci_dev *ndev);
+
+#endif /* __LOCAL_FDP_H_ */

linux-7.2.3/drivers/nfc/fdp/i2c.c

@@ -0,0 +1,396 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* -------------------------------------------------------------------------
+ * Copyright (C) 2014-2016, Intel Corporation
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/nfc.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <net/nfc/nfc.h>
+#include <net/nfc/nci_core.h>
+
+#include "fdp.h"
+
+#define FDP_I2C_DRIVER_NAME	"fdp_nci_i2c"
+
+#define FDP_DP_CLOCK_TYPE_NAME	"clock-type"
+#define FDP_DP_CLOCK_FREQ_NAME	"clock-freq"
+#define FDP_DP_FW_VSC_CFG_NAME	"fw-vsc-cfg"
+
+#define FDP_FRAME_HEADROOM	2
+#define FDP_FRAME_TAILROOM	1
+
+#define FDP_NCI_I2C_MIN_PAYLOAD	5
+#define FDP_NCI_I2C_MAX_PAYLOAD	261
+
+#define FDP_POWER_OFF		0
+#define FDP_POWER_ON		1
+
+#define fdp_nci_i2c_dump_skb(dev, prefix, skb)				\
+	print_hex_dump(KERN_DEBUG, prefix": ", DUMP_PREFIX_OFFSET,	\
+		       16, 1, (skb)->data, (skb)->len, 0)
+
+static void fdp_nci_i2c_reset(const struct fdp_i2c_phy *phy)
+{
+	/* Reset RST/WakeUP for at least 100 micro-second */
+	gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_OFF);
+	usleep_range(1000, 4000);
+	gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_ON);
+	usleep_range(10000, 14000);
+}
+
+static int fdp_nci_i2c_enable(void *phy_id)
+{
+	const struct fdp_i2c_phy *phy = phy_id;
+
+	fdp_nci_i2c_reset(phy);
+
+	return 0;
+}
+
+static void fdp_nci_i2c_disable(void *phy_id)
+{
+	const struct fdp_i2c_phy *phy = phy_id;
+
+	fdp_nci_i2c_reset(phy);
+}
+
+static void fdp_nci_i2c_add_len_lrc(struct sk_buff *skb)
+{
+	u8 lrc = 0;
+	u16 len, i;
+
+	/* Add length header */
+	len = skb->len;
+	*(u8 *)skb_push(skb, 1) = len & 0xff;
+	*(u8 *)skb_push(skb, 1) = len >> 8;
+
+	/* Compute and add lrc */
+	for (i = 0; i < len + 2; i++)
+		lrc ^= skb->data[i];
+
+	skb_put_u8(skb, lrc);
+}
+
+static void fdp_nci_i2c_remove_len_lrc(struct sk_buff *skb)
+{
+	skb_pull(skb, FDP_FRAME_HEADROOM);
+	skb_trim(skb, skb->len - FDP_FRAME_TAILROOM);
+}
+
+static int fdp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
+{
+	struct fdp_i2c_phy *phy = phy_id;
+	struct i2c_client *client = phy->i2c_dev;
+	int r;
+
+	if (phy->hard_fault != 0)
+		return phy->hard_fault;
+
+	fdp_nci_i2c_add_len_lrc(skb);
+	fdp_nci_i2c_dump_skb(&client->dev, "fdp_wr", skb);
+
+	r = i2c_master_send(client, skb->data, skb->len);
+	if (r == -EREMOTEIO) {  /* Retry, chip was in standby */
+		usleep_range(1000, 4000);
+		r = i2c_master_send(client, skb->data, skb->len);
+	}
+
+	if (r < 0 || r != skb->len)
+		dev_dbg(&client->dev, "%s: error err=%d len=%d\n",
+			__func__, r, skb->len);
+
+	if (r >= 0) {
+		if (r != skb->len) {
+			phy->hard_fault = r;
+			r = -EREMOTEIO;
+		} else {
+			r = 0;
+		}
+	}
+
+	fdp_nci_i2c_remove_len_lrc(skb);
+
+	return r;
+}
+
+static const struct nfc_phy_ops i2c_phy_ops = {
+	.write = fdp_nci_i2c_write,
+	.enable = fdp_nci_i2c_enable,
+	.disable = fdp_nci_i2c_disable,
+};
+
+static int fdp_nci_i2c_read(struct fdp_i2c_phy *phy, struct sk_buff **skb)
+{
+	int r, len;
+	u8 tmp[FDP_NCI_I2C_MAX_PAYLOAD], lrc, k;
+	u16 i;
+	struct i2c_client *client = phy->i2c_dev;
+
+	*skb = NULL;
+
+	/* Read the length packet and the data packet */
+	for (k = 0; k < 2; k++) {
+
+		len = phy->next_read_size;
+
+		r = i2c_master_recv(client, tmp, len);
+		if (r != len) {
+			dev_dbg(&client->dev, "%s: i2c recv err: %d\n",
+				__func__, r);
+			goto flush;
+		}
+
+		/* Check packet integruty */
+		for (lrc = i = 0; i < r; i++)
+			lrc ^= tmp[i];
+
+		/*
+		 * LRC check failed. This may due to transmission error or
+		 * desynchronization between driver and FDP. Drop the packet
+		 * and force resynchronization
+		 */
+		if (lrc) {
+			dev_dbg(&client->dev, "%s: corrupted packet\n",
+				__func__);
+			phy->next_read_size = 5;
+			goto flush;
+		}
+
+		/* Packet that contains a length */
+		if (tmp[0] == 0 && tmp[1] == 0) {
+			phy->next_read_size = (tmp[2] << 8) + tmp[3] + 3;
+
+			/*
+			 * next_read_size is taken from the device and is used
+			 * as the i2c_master_recv() count for the next packet
+			 * and as the data skb size. A value above the receive
+			 * buffer overflows tmp[]; one below the minimum frame
+			 * size runs the header/LRC strip and the length-field
+			 * read past a short receive. Either way the packet is
+			 * corrupt: drop it and force resynchronization.
+			 */
+			if (phy->next_read_size < FDP_NCI_I2C_MIN_PAYLOAD ||
+			    phy->next_read_size > FDP_NCI_I2C_MAX_PAYLOAD) {
+				dev_dbg(&client->dev, "%s: corrupted packet\n",
+					__func__);
+				phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
+				goto flush;
+			}
+		} else {
+			phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
+
+			/*
+			 * Only one data packet is delivered per call; if the
+			 * device sends another, do not overwrite and leak the
+			 * skb allocated for the previous one.
+			 */
+			if (*skb) {
+				kfree_skb(*skb);
+				*skb = NULL;
+			}
+
+			*skb = alloc_skb(len, GFP_KERNEL);
+			if (*skb == NULL) {
+				r = -ENOMEM;
+				goto flush;
+			}
+
+			skb_put_data(*skb, tmp, len);
+			fdp_nci_i2c_dump_skb(&client->dev, "fdp_rd", *skb);
+
+			fdp_nci_i2c_remove_len_lrc(*skb);
+		}
+	}
+
+	return 0;
+
+flush:
+	/* Flush the remaining data */
+	if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
+		r = -EREMOTEIO;
+
+	return r;
+}
+
+static irqreturn_t fdp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
+{
+	struct fdp_i2c_phy *phy = phy_id;
+	struct sk_buff *skb;
+	int r;
+
+	if (!phy || irq != phy->i2c_dev->irq) {
+		WARN_ON_ONCE(1);
+		return IRQ_NONE;
+	}
+
+	r = fdp_nci_i2c_read(phy, &skb);
+
+	if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
+		return IRQ_HANDLED;
+
+	if (skb != NULL)
+		nci_recv_frame(phy->ndev, skb);
+
+	return IRQ_HANDLED;
+}
+
+static void fdp_nci_i2c_read_device_properties(struct device *dev,
+					       u8 *clock_type, u32 *clock_freq,
+					       u8 **fw_vsc_cfg)
+{
+	int r;
+	u8 len;
+
+	r = device_property_read_u8(dev, FDP_DP_CLOCK_TYPE_NAME, clock_type);
+	if (r) {
+		dev_dbg(dev, "Using default clock type");
+		*clock_type = 0;
+	}
+
+	r = device_property_read_u32(dev, FDP_DP_CLOCK_FREQ_NAME, clock_freq);
+	if (r) {
+		dev_dbg(dev, "Using default clock frequency\n");
+		*clock_freq = 26000;
+	}
+
+	if (device_property_present(dev, FDP_DP_FW_VSC_CFG_NAME)) {
+		r = device_property_read_u8(dev, FDP_DP_FW_VSC_CFG_NAME,
+					    &len);
+
+		if (r || len <= 0)
+			goto vsc_read_err;
+
+		/* Add 1 to the length to inclue the length byte itself */
+		len++;
+
+		*fw_vsc_cfg = devm_kmalloc_array(dev,
+					   len, sizeof(**fw_vsc_cfg),
+					   GFP_KERNEL);
+
+		if (!*fw_vsc_cfg)
+			goto alloc_err;
+
+		r = device_property_read_u8_array(dev, FDP_DP_FW_VSC_CFG_NAME,
+						  *fw_vsc_cfg, len);
+
+		if (r) {
+			devm_kfree(dev, *fw_vsc_cfg);
+			goto vsc_read_err;
+		}
+	} else {
+vsc_read_err:
+		dev_dbg(dev, "FW vendor specific commands not present\n");
+		*fw_vsc_cfg = NULL;
+	}
+
+alloc_err:
+	dev_dbg(dev, "Clock type: %d, clock frequency: %d, VSC: %s",
+		*clock_type, *clock_freq, *fw_vsc_cfg != NULL ? "yes" : "no");
+}
+
+static const struct acpi_gpio_params power_gpios = { 0, 0, false };
+
+static const struct acpi_gpio_mapping acpi_fdp_gpios[] = {
+	{ "power-gpios", &power_gpios, 1 },
+	{},
+};
+
+static int fdp_nci_i2c_probe(struct i2c_client *client)
+{
+	struct fdp_i2c_phy *phy;
+	struct device *dev = &client->dev;
+	u8 *fw_vsc_cfg;
+	u8 clock_type;
+	u32 clock_freq;
+	int r = 0;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		nfc_err(dev, "No I2C_FUNC_I2C support\n");
+		return -ENODEV;
+	}
+
+	/* Checking if we have an irq */
+	if (client->irq <= 0) {
+		nfc_err(dev, "IRQ not present\n");
+		return -ENODEV;
+	}
+
+	phy = devm_kzalloc(dev, sizeof(struct fdp_i2c_phy), GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	phy->i2c_dev = client;
+	phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;
+	i2c_set_clientdata(client, phy);
+
+	r = devm_request_threaded_irq(dev, client->irq,
+				      NULL, fdp_nci_i2c_irq_thread_fn,
+				      IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+				      FDP_I2C_DRIVER_NAME, phy);
+
+	if (r < 0) {
+		nfc_err(&client->dev, "Unable to register IRQ handler\n");
+		return r;
+	}
+
+	r = devm_acpi_dev_add_driver_gpios(dev, acpi_fdp_gpios);
+	if (r)
+		dev_dbg(dev, "Unable to add GPIO mapping table\n");
+
+	/* Requesting the power gpio */
+	phy->power_gpio = devm_gpiod_get(dev, "power", GPIOD_OUT_LOW);
+	if (IS_ERR(phy->power_gpio)) {
+		nfc_err(dev, "Power GPIO request failed\n");
+		return PTR_ERR(phy->power_gpio);
+	}
+
+	/* read device properties to get the clock and production settings */
+	fdp_nci_i2c_read_device_properties(dev, &clock_type, &clock_freq,
+					   &fw_vsc_cfg);
+
+	/* Call the NFC specific probe function */
+	r = fdp_nci_probe(phy, &i2c_phy_ops, &phy->ndev,
+			  FDP_FRAME_HEADROOM, FDP_FRAME_TAILROOM,
+			  clock_type, clock_freq, fw_vsc_cfg);
+	if (r < 0) {
+		nfc_err(dev, "NCI probing error\n");
+		return r;
+	}
+
+	return 0;
+}
+
+static void fdp_nci_i2c_remove(struct i2c_client *client)
+{
+	struct fdp_i2c_phy *phy = i2c_get_clientdata(client);
+
+	fdp_nci_remove(phy->ndev);
+	fdp_nci_i2c_disable(phy);
+}
+
+static const struct acpi_device_id fdp_nci_i2c_acpi_match[] = {
+	{"INT339A", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, fdp_nci_i2c_acpi_match);
+
+static struct i2c_driver fdp_nci_i2c_driver = {
+	.driver = {
+		   .name = FDP_I2C_DRIVER_NAME,
+		   .acpi_match_table = fdp_nci_i2c_acpi_match,
+		  },
+	.probe = fdp_nci_i2c_probe,
+	.remove = fdp_nci_i2c_remove,
+};
+module_i2c_driver(fdp_nci_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("I2C driver for Intel Fields Peak NFC controller");
+MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");