Add driver for Samsung S3FWRN82 NFC controller.
S3FWRN82 is using NCI protocol and I2C communication interface.
Signed-off-by: Bongsu Jeon <bongsu.jeon@xxxxxxxxxxx>
---
drivers/nfc/Kconfig | 1 +
drivers/nfc/Makefile | 1 +
drivers/nfc/s3fwrn82/Kconfig | 15 ++
drivers/nfc/s3fwrn82/Makefile | 10 ++
drivers/nfc/s3fwrn82/core.c | 133 +++++++++++++++
drivers/nfc/s3fwrn82/i2c.c | 288 ++++++++++++++++++++++++++++++++
drivers/nfc/s3fwrn82/s3fwrn82.h | 86 ++++++++++
7 files changed, 534 insertions(+)
create mode 100644 drivers/nfc/s3fwrn82/Kconfig
create mode 100644 drivers/nfc/s3fwrn82/Makefile
create mode 100644 drivers/nfc/s3fwrn82/core.c
create mode 100644 drivers/nfc/s3fwrn82/i2c.c
create mode 100644 drivers/nfc/s3fwrn82/s3fwrn82.h
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index 75c65d339018..102654909d3a 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -59,4 +59,5 @@ source "drivers/nfc/st-nci/Kconfig"
source "drivers/nfc/nxp-nci/Kconfig"
source "drivers/nfc/s3fwrn5/Kconfig"
source "drivers/nfc/st95hf/Kconfig"
+source "drivers/nfc/s3fwrn82/Kconfig"
endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index 5393ba59b17d..518d83301ad2 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_NFC_ST_NCI) += st-nci/
obj-$(CONFIG_NFC_NXP_NCI) += nxp-nci/
obj-$(CONFIG_NFC_S3FWRN5) += s3fwrn5/
obj-$(CONFIG_NFC_ST95HF) += st95hf/
+obj-$(CONFIG_NFC_S3FWRN82) += s3fwrn82/
diff --git a/drivers/nfc/s3fwrn82/Kconfig b/drivers/nfc/s3fwrn82/Kconfig
new file mode 100644
index 000000000000..afbad659cf07
--- /dev/null
+++ b/drivers/nfc/s3fwrn82/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config NFC_S3FWRN82
+ tristate
+
+config NFC_S3FWRN82_I2C
+ tristate "Samsung S3FWRN82 I2C support"
+ depends on NFC_NCI && I2C
+ select NFC_S3FWRN82
+ help
+ This module adds support for an I2C interface to the S3FWRN82 chip.
+ Select this if your platform is using the I2C bus.
+
+ To compile this driver as a module, choose m here. The module will
+ be called s3fwrn82_i2c.ko.
+ Say N if unsure.
diff --git a/drivers/nfc/s3fwrn82/Makefile b/drivers/nfc/s3fwrn82/Makefile
new file mode 100644
index 000000000000..198e2cd85e91
--- /dev/null
+++ b/drivers/nfc/s3fwrn82/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Samsung S3FWRN82 NFC driver
+#
+
+s3fwrn82-objs = core.o
+s3fwrn82_i2c-objs = i2c.o
+
+obj-$(CONFIG_NFC_S3FWRN82) += s3fwrn82.o
+obj-$(CONFIG_NFC_S3FWRN82_I2C) += s3fwrn82_i2c.o
diff --git a/drivers/nfc/s3fwrn82/core.c b/drivers/nfc/s3fwrn82/core.c
new file mode 100644
index 000000000000..e01e02c758ab
--- /dev/null
+++ b/drivers/nfc/s3fwrn82/core.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NCI based driver for Samsung S3FWRN82 NFC chip
+ *
+ * Copyright (C) 2020 Samsung Electrnoics
+ * Bongsu Jeon <bongsu.jeon@xxxxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <net/nfc/nci_core.h>
+
+#include "s3fwrn82.h"
+
+#define S3FWRN82_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
+ NFC_PROTO_MIFARE_MASK | \
+ NFC_PROTO_FELICA_MASK | \
+ NFC_PROTO_ISO14443_MASK | \
+ NFC_PROTO_ISO14443_B_MASK | \
+ NFC_PROTO_ISO15693_MASK)
+
+static int s3fwrn82_nci_open(struct nci_dev *ndev)
+{
+ struct s3fwrn82_info *info = nci_get_drvdata(ndev);
+
+ if (s3fwrn82_get_mode(info) != S3FWRN82_MODE_COLD)
+ return -EBUSY;
+
+ s3fwrn82_set_mode(info, S3FWRN82_MODE_NCI);
+ s3fwrn82_set_wake(info, true);
+
+ return 0;
+}
+
+static int s3fwrn82_nci_close(struct nci_dev *ndev)
+{
+ struct s3fwrn82_info *info = nci_get_drvdata(ndev);
+
+ s3fwrn82_set_wake(info, false);
+ s3fwrn82_set_mode(info, S3FWRN82_MODE_COLD);
+
+ return 0;
+}
+
+static int s3fwrn82_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
+{
+ struct s3fwrn82_info *info = nci_get_drvdata(ndev);
+ int ret;
+
+ mutex_lock(&info->mutex);
+
+ if (s3fwrn82_get_mode(info) != S3FWRN82_MODE_NCI) {
+ mutex_unlock(&info->mutex);
+ return -EINVAL;
+ }
+
+ ret = s3fwrn82_write(info, skb);
+ if (ret < 0)
+ kfree_skb(skb);
+
+ mutex_unlock(&info->mutex);
+ return ret;
+}
+
+static struct nci_ops s3fwrn82_nci_ops = {
+ .open = s3fwrn82_nci_open,
+ .close = s3fwrn82_nci_close,
+ .send = s3fwrn82_nci_send,
+};
+
+int s3fwrn82_probe(struct nci_dev **ndev,
+ void *phy_id,
+ struct device *pdev,
+ const struct s3fwrn82_phy_ops *phy_ops)
+{
+ struct s3fwrn82_info *info;
+ int ret;
+
+ info = devm_kzalloc(pdev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->phy_id = phy_id;
+ info->pdev = pdev;
+ info->phy_ops = phy_ops;
+ mutex_init(&info->mutex);
+
+ s3fwrn82_set_mode(info, S3FWRN82_MODE_COLD);
+
+ info->ndev = nci_allocate_device(&s3fwrn82_nci_ops, S3FWRN82_NFC_PROTOCOLS, 0, 0);
+ if (!info->ndev)
+ return -ENOMEM;
+
+ nci_set_parent_dev(info->ndev, pdev);
+ nci_set_drvdata(info->ndev, info);
+
+ ret = nci_register_device(info->ndev);
+ if (ret < 0) {
+ nci_free_device(info->ndev);
+ return ret;
+ }
+
+ *ndev = info->ndev;
+
+ return ret;
+}
+EXPORT_SYMBOL(s3fwrn82_probe);
+
+void s3fwrn82_remove(struct nci_dev *ndev)
+{
+ struct s3fwrn82_info *info = nci_get_drvdata(ndev);
+
+ s3fwrn82_set_mode(info, S3FWRN82_MODE_COLD);
+
+ nci_unregister_device(ndev);
+ nci_free_device(ndev);
+}
+EXPORT_SYMBOL(s3fwrn82_remove);
+
+int s3fwrn82_recv_frame(struct nci_dev *ndev, struct sk_buff *skb, enum s3fwrn82_mode mode)
+{
+ switch (mode) {
+ case S3FWRN82_MODE_NCI:
+ return nci_recv_frame(ndev, skb);
+ default:
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL(s3fwrn82_recv_frame);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Samsung S3FWRN82 NFC driver");
+MODULE_AUTHOR("Bongsu Jeon <bongsu.jeon@xxxxxxxxxxx>");
diff --git a/drivers/nfc/s3fwrn82/i2c.c b/drivers/nfc/s3fwrn82/i2c.c
new file mode 100644
index 000000000000..ea50c0165865
--- /dev/null
+++ b/drivers/nfc/s3fwrn82/i2c.c
@@ -0,0 +1,288 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * I2C Link Layer for Samsung S3FWRN82 NCI based Driver
+ *
+ * Copyright (C) 2020 Samsung Electrnoics
+ * Bongsu Jeon <bongsu.jeon@xxxxxxxxxxx>
+ */
+
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/module.h>
+
+#include <net/nfc/nfc.h>
+
+#include "s3fwrn82.h"
+
+#define S3FWRN82_I2C_DRIVER_NAME "s3fwrn82_i2c"
+
+#define S3FWRN82_EN_WAIT_TIME 20
+
+struct s3fwrn82_i2c_phy {
+ struct i2c_client *i2c_dev;
+ struct nci_dev *ndev;
+
+ unsigned int gpio_en;
+ unsigned int gpio_fw_wake;
+
+ /* use this mutex for syncronization of phy */
+ struct mutex mutex;
+
+ enum s3fwrn82_mode mode;
+ unsigned int irq_skip:1;
+};
+
+static void s3fwrn82_i2c_set_wake(void *phy_id, bool wake)
+{
+ struct s3fwrn82_i2c_phy *phy = phy_id;
+
+ mutex_lock(&phy->mutex);
+ gpio_set_value(phy->gpio_fw_wake, wake);
+ if (wake)
+ msleep(S3FWRN82_EN_WAIT_TIME);
+ mutex_unlock(&phy->mutex);
+}
+
+static void s3fwrn82_i2c_set_mode(void *phy_id, enum s3fwrn82_mode mode)
+{
+ struct s3fwrn82_i2c_phy *phy = phy_id;
+
+ mutex_lock(&phy->mutex);
+
+ if (phy->mode == mode)
+ goto out;
+
+ phy->mode = mode;
+
+ gpio_set_value(phy->gpio_en, 1);
+ gpio_set_value(phy->gpio_fw_wake, 0);
+
+ if (mode != S3FWRN82_MODE_COLD) {
+ msleep(S3FWRN82_EN_WAIT_TIME);
+ gpio_set_value(phy->gpio_en, 0);
+ msleep(S3FWRN82_EN_WAIT_TIME / 2);
+ }
+
+ phy->irq_skip = true;
+
+out:
+ mutex_unlock(&phy->mutex);
+}
+
+static enum s3fwrn82_mode s3fwrn82_i2c_get_mode(void *phy_id)
+{
+ struct s3fwrn82_i2c_phy *phy = phy_id;
+ enum s3fwrn82_mode mode;
+
+ mutex_lock(&phy->mutex);
+
+ mode = phy->mode;
+
+ mutex_unlock(&phy->mutex);
+
+ return mode;
+}
+
+static int s3fwrn82_i2c_write(void *phy_id, struct sk_buff *skb)
+{
+ struct s3fwrn82_i2c_phy *phy = phy_id;
+ int ret;
+
+ mutex_lock(&phy->mutex);
+
+ phy->irq_skip = false;
+
+ ret = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
+ mutex_unlock(&phy->mutex);
+
+ if (ret < 0)
+ return ret;
+
+ if (ret != skb->len)
+ return -EREMOTEIO;
+
+ return 0;
+}
+
+static const struct s3fwrn82_phy_ops i2c_phy_ops = {
+ .set_wake = s3fwrn82_i2c_set_wake,
+ .set_mode = s3fwrn82_i2c_set_mode,
+ .get_mode = s3fwrn82_i2c_get_mode,
+ .write = s3fwrn82_i2c_write,
+};
+
+static int s3fwrn82_i2c_read(struct s3fwrn82_i2c_phy *phy)
+{
+ struct sk_buff *skb;
+ size_t hdr_size;
+ size_t data_len;
+ char hdr[4];
+ int ret;
+
+ hdr_size = NCI_CTRL_HDR_SIZE;
+ ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
+ if (ret < 0)
+ return ret;
+
+ if (ret < hdr_size)
+ return -EBADMSG;
+
+ data_len = ((struct nci_ctrl_hdr *)hdr)->plen;
+
+ skb = alloc_skb(hdr_size + data_len, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ skb_put_data(skb, hdr, hdr_size);
+
+ if (data_len == 0)
+ goto out;
+
+ ret = i2c_master_recv(phy->i2c_dev, skb_put(skb, data_len), data_len);
+ if (ret != data_len) {
+ kfree_skb(skb);
+ return -EBADMSG;
+ }
+
+out:
+ return s3fwrn82_recv_frame(phy->ndev, skb, phy->mode);
+}
+
+static irqreturn_t s3fwrn82_i2c_irq_thread_fn(int irq, void *phy_id)
+{
+ struct s3fwrn82_i2c_phy *phy = phy_id;
+
+ if (!phy || !phy->ndev) {
+ WARN_ON_ONCE(1);
+ return IRQ_NONE;
+ }
+
+ mutex_lock(&phy->mutex);
+
+ if (phy->irq_skip)
+ goto out;
+
+ switch (phy->mode) {
+ case S3FWRN82_MODE_NCI:
+ s3fwrn82_i2c_read(phy);
+ break;
+ case S3FWRN82_MODE_COLD:
+ break;
+ }
+
+out:
+ mutex_unlock(&phy->mutex);
+
+ return IRQ_HANDLED;
+}
+
+static int s3fwrn82_i2c_parse_dt(struct i2c_client *client)
+{
+ struct s3fwrn82_i2c_phy *phy = i2c_get_clientdata(client);
+ struct device_node *np = client->dev.of_node;
+
+ if (!np)
+ return -ENODEV;
+
+ phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0);
+ if (!gpio_is_valid(phy->gpio_en))
+ return -ENODEV;
+
+ phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
+ if (!gpio_is_valid(phy->gpio_fw_wake))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int s3fwrn82_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct s3fwrn82_i2c_phy *phy;
+ int ret;
+
+ phy = devm_kzalloc(&client->dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ mutex_init(&phy->mutex);
+ phy->mode = S3FWRN82_MODE_COLD;
+ phy->irq_skip = true;
+
+ phy->i2c_dev = client;
+ i2c_set_clientdata(client, phy);
+
+ ret = s3fwrn82_i2c_parse_dt(client);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_gpio_request_one(&phy->i2c_dev->dev,
+ phy->gpio_en,
+ GPIOF_OUT_INIT_HIGH,
+ "s3fwrn82_en");
+ if (ret < 0)
+ return ret;
+
+ ret = devm_gpio_request_one(&phy->i2c_dev->dev,
+ phy->gpio_fw_wake,
+ GPIOF_OUT_INIT_LOW,
+ "s3fwrn82_fw_wake");
+ if (ret < 0)
+ return ret;
+
+ ret = s3fwrn82_probe(&phy->ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_request_threaded_irq(&client->dev,
+ phy->i2c_dev->irq,
+ NULL,
+ s3fwrn82_i2c_irq_thread_fn,
+ IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+ S3FWRN82_I2C_DRIVER_NAME,
+ phy);
+ if (ret)
+ s3fwrn82_remove(phy->ndev);
+
+ return ret;
+}
+
+static int s3fwrn82_i2c_remove(struct i2c_client *client)
+{
+ struct s3fwrn82_i2c_phy *phy = i2c_get_clientdata(client);
+
+ s3fwrn82_remove(phy->ndev);
+
+ return 0;
+}
+
+static const struct i2c_device_id s3fwrn82_i2c_id_table[] = {
+ {S3FWRN82_I2C_DRIVER_NAME, 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, s3fwrn82_i2c_id_table);
+
+static const struct of_device_id of_s3fwrn82_i2c_match[] = {
+ { .compatible = "samsung,s3fwrn82-i2c", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, of_s3fwrn82_i2c_match);
+
+static struct i2c_driver s3fwrn82_i2c_driver = {
+ .driver = {
+ .name = S3FWRN82_I2C_DRIVER_NAME,
+ .of_match_table = of_match_ptr(of_s3fwrn82_i2c_match),
+ },
+ .probe = s3fwrn82_i2c_probe,
+ .remove = s3fwrn82_i2c_remove,
+ .id_table = s3fwrn82_i2c_id_table,
+};
+
+module_i2c_driver(s3fwrn82_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("I2C driver for Samsung S3FWRN82");
+MODULE_AUTHOR("Bongsu Jeon <bongsu.jeon@xxxxxxxxxxx>");
diff --git a/drivers/nfc/s3fwrn82/s3fwrn82.h b/drivers/nfc/s3fwrn82/s3fwrn82.h
new file mode 100644
index 000000000000..4c19d1fafde6
--- /dev/null
+++ b/drivers/nfc/s3fwrn82/s3fwrn82.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * NCI based driver for Samsung S3FWRN82 NFC chip
+ *
+ * Copyright (C) 2020 Samsung Electrnoics
+ * Bongsu Jeon <bongsu.jeon@xxxxxxxxxxx>
+ */
+
+#ifndef __LOCAL_S3FWRN82_H_
+#define __LOCAL_S3FWRN82_H_
+
+#include <linux/nfc.h>
+
+#include <net/nfc/nci_core.h>
+
+enum s3fwrn82_mode {
+ S3FWRN82_MODE_COLD,
+ S3FWRN82_MODE_NCI,
+};
+
+struct s3fwrn82_phy_ops {
+ void (*set_wake)(void *id, bool sleep);
+ void (*set_mode)(void *id, enum s3fwrn82_mode);
+ enum s3fwrn82_mode (*get_mode)(void *id);
+ int (*write)(void *id, struct sk_buff *skb);
+};
+
+struct s3fwrn82_info {
+ struct nci_dev *ndev;
+ void *phy_id;
+ struct device *pdev;
+
+ const struct s3fwrn82_phy_ops *phy_ops;
+
+ /* use this mutex for syncronization of nci write */
+ struct mutex mutex;
+};
+
+static inline int s3fwrn82_set_mode(struct s3fwrn82_info *info,
+ enum s3fwrn82_mode mode)
+{
+ if (!info->phy_ops->set_mode)
+ return -EOPNOTSUPP;
+
+ info->phy_ops->set_mode(info->phy_id, mode);
+
+ return 0;
+}
+
+static inline enum s3fwrn82_mode s3fwrn82_get_mode(struct s3fwrn82_info *info)
+{
+ if (!info->phy_ops->get_mode)
+ return -EOPNOTSUPP;
+
+ return info->phy_ops->get_mode(info->phy_id);
+}
+
+static inline int s3fwrn82_set_wake(struct s3fwrn82_info *info, bool wake)
+{
+ if (!info->phy_ops->set_wake)
+ return -EOPNOTSUPP;
+
+ info->phy_ops->set_wake(info->phy_id, wake);
+
+ return 0;
+}
+
+static inline int s3fwrn82_write(struct s3fwrn82_info *info, struct sk_buff *skb)
+{
+ if (!info->phy_ops->write)
+ return -EOPNOTSUPP;
+
+ return info->phy_ops->write(info->phy_id, skb);
+}
+
+int s3fwrn82_probe(struct nci_dev **ndev,
+ void *phy_id,
+ struct device *pdev,
+ const struct s3fwrn82_phy_ops *phy_ops);
+void s3fwrn82_remove(struct nci_dev *ndev);
+
+int s3fwrn82_recv_frame(struct nci_dev *ndev,
+ struct sk_buff *skb,
+ enum s3fwrn82_mode mode);
+
+#endif /* __LOCAL_S3FWRN82_H_ */
--
