This is a driver for the S3FHRN2 NFC device. the driver is just a
proxy getting SHDLC/HCI frames from a userspace stack.
Signed-off-by: WoonKi Lee <woonki84.lee@xxxxxxxxxxx>
---
drivers/nfc/Kconfig | 8 +
drivers/nfc/Makefile | 1 +
drivers/nfc/s3fhrn2_i2c.c | 594 +++++++++++++++++++++++++++++++++++++++++++
include/linux/nfc/s3fhrn2.h | 52 ++++
4 files changed, 655 insertions(+), 0 deletions(-)
create mode 100644 drivers/nfc/s3fhrn2_i2c.c
create mode 100644 include/linux/nfc/s3fhrn2.h
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index 3b20b73..08a90a9 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -51,4 +51,12 @@ config NFC_WILINK
Say Y here to compile support for Texas Instrument's NFC WiLink driver
into the kernel or say M to compile it as module.
+config S3FHRN2
+ bool "Samsung NFC S3FHRN2 I2C driver"
+ depends on I2C
+ help
+ This driver provides support for NFC SAMSUNG S3FHRN2 devices.
+ Say Y if you want S3FHRN2 NFC driver.
+
+ This is for I2C connected version. If unsure, say N here.
endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index 473e44c..983ce4f 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -6,5 +6,6 @@ obj-$(CONFIG_PN544_NFC) += pn544.o
obj-$(CONFIG_PN544_HCI_NFC) += pn544_hci.o
obj-$(CONFIG_NFC_PN533) += pn533.o
obj-$(CONFIG_NFC_WILINK) += nfcwilink.o
+obj-$(CONFIG_S3FHRN2_I2C) += s3fhrn2_i2c.o
ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
diff --git a/drivers/nfc/s3fhrn2_i2c.c b/drivers/nfc/s3fhrn2_i2c.c
new file mode 100644
index 0000000..7d72b0c
--- /dev/null
+++ b/drivers/nfc/s3fhrn2_i2c.c
@@ -0,0 +1,594 @@
+/*
+ * SAMSUNG NFC S3FHRN2 Controller for I2C I/F
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * Author: Woonki Lee <woonki84.lee@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/nfc/s3fhrn2.h>
+
+#define S3FHRN2_IS_LENGTH(val) (val == S3FHRN2_LLC_LENGTH)
+
+enum s3fhrn2_irq {
+ S3FHRN2_NONE,
+ S3FHRN2_INT,
+};
+
+struct s3fhrn2_info {
+ struct miscdevice miscdev;
+ struct i2c_client *i2c_dev;
+ struct mutex read_mutex;
+ struct mutex mutex;
+ enum s3fhrn2_state state; /* off, normal, firm download mode */
+ enum s3fhrn2_irq read_irq;
+ wait_queue_head_t read_wait;
+ size_t buflen;
+ u8 *buf;
+};
+
+static irqreturn_t s3fhrn2_irq_thread_fn(int irq, void *dev_id)
+{
+ struct s3fhrn2_info *info = dev_id;
+ struct i2c_client *client = info->i2c_dev;
+
+ dev_dbg(&client->dev, "IRQ\n");
+
+ mutex_lock(&info->read_mutex);
+ info->read_irq = S3FHRN2_INT;
+ mutex_unlock(&info->read_mutex);
+
+ wake_up_interruptible(&info->read_wait);
+
+ return IRQ_HANDLED;
+}
+
+static int s3fhrn2_set_state(struct s3fhrn2_info *info,
+ enum s3fhrn2_state state)
+{
+ struct i2c_client *client = info->i2c_dev;
+ struct s3fhrn2_platform_data *pdata = client->dev.platform_data;
+
+ /* intfo lock is aleady getten before calling this function */
+ info->read_irq = S3FHRN2_NONE;
+ info->state = state;
+
+ gpio_set_value(pdata->ven, 0);
+ gpio_set_value(pdata->firm, 0);
+ msleep(S3FHRN2_VEN_WAIT_TIME);
+
+ if (state == S3FHRN2_ST_FIRM) {
+ gpio_set_value(pdata->firm, 1);
+ msleep(S3FHRN2_VEN_WAIT_TIME);
+ gpio_set_value(pdata->ven, 0);
+ msleep(S3FHRN2_VEN_WAIT_TIME);
+ }
+
+ if (state != S3FHRN2_ST_OFF)
+ gpio_set_value(pdata->ven, 1);
+
+ msleep(S3FHRN2_VEN_WAIT_TIME*3);
+
+ return 0;
+}
+
+static int s3fhrn2_reset(struct s3fhrn2_info *info)
+{
+ struct i2c_client *client = info->i2c_dev;
+
+ dev_err(&client->dev, "i2c failed. return resatrt to M/W\n");
+
+ s3fhrn2_set_state(info, S3FHRN2_ST_NORM);
+
+ return -ERESTART;
+}
+
+static ssize_t s3fhrn2_read(struct file *file, char __user *buf,
+ size_t count, loff_t *offset)
+{
+ struct s3fhrn2_info *info = container_of(file->private_data,
+ struct s3fhrn2_info, miscdev);
+ struct i2c_client *client = info->i2c_dev;
+ enum s3fhrn2_irq irq;
+ int min = S3FHRN2_MSG_MIN_SIZE;
+ int max = S3FHRN2_MSG_MAX_SIZE;
+ int ret = 0;
+
+ dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__,
+ info, count);
+
+ mutex_lock(&info->mutex);
+
+ if (info->state == S3FHRN2_ST_OFF) {
+ dev_err(&client->dev, "s3fhrn2 is not enabled\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ mutex_lock(&info->read_mutex);
+ irq = info->read_irq;
+ mutex_unlock(&info->read_mutex);
+ if (irq == S3FHRN2_NONE) {
+ if (file->f_flags & O_NONBLOCK) {
+ dev_err(&client->dev, "it is nonblock\n");
+ ret = -EAGAIN;
+ goto out;
+ }
+
+ if (wait_event_interruptible(info->read_wait,
+ (info->read_irq == S3FHRN2_INT))) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+ }
+
+ /* i2c recv */
+ if (count > info->buflen)
+ count = info->buflen;
+
+ min = (info->state == S3FHRN2_ST_FIRM) ?
+ S3FHRN2_FIRM_MIN_SIZE : S3FHRN2_MSG_MIN_SIZE;
+ max = (info->state == S3FHRN2_ST_FIRM) ?
+ S3FHRN2_FIRM_MAX_SIZE : S3FHRN2_MSG_MAX_SIZE;
+
+ if (count < min || count > max) {
+ dev_dbg(&client->dev, "user required wrong size\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ mutex_lock(&info->read_mutex);
+ ret = i2c_master_recv(client, info->buf, count);
+ dev_dbg(&client->dev, "recv size : %d\n", ret);
+
+ if (ret == -EREMOTEIO) {
+ ret = s3fhrn2_reset(info);
+ goto read_error;
+ } else if (ret != count) {
+ dev_err(&client->dev, "read failed: return: %d count: %d\n",
+ ret, count);
+ ret = -EREMOTEIO;
+ goto read_error;
+ }
+
+ /* Only reading data can clear read_irq state. */
+ if (!S3FHRN2_IS_LENGTH(ret) || info->state == S3FHRN2_ST_FIRM)
+ info->read_irq = S3FHRN2_NONE;
+ /* check the length value,
+ It may be doing when reading length of frame. */
+ else if (info->buf[0] < min || info->buf[0] > max) {
+ dev_err(&client->dev, "reciev invaild length : %x\n",
+ info->buf[0]);
+
+ /* We need to check if i2c transmit is possible */
+ ret = i2c_master_send(client, "test", 1);
+ if (ret == -EREMOTEIO)
+ ret = s3fhrn2_reset(info);
+ else
+ ret = -EINVAL;
+
+ goto read_error;
+ }
+ mutex_unlock(&info->read_mutex);
+
+ *offset += ret;
+ if (copy_to_user(buf, info->buf, ret)) {
+ dev_err(&client->dev, "copy failed to user\n");
+ ret = -EFAULT;
+ }
+
+ goto out;
+
+read_error:
+ info->read_irq = S3FHRN2_NONE;
+ mutex_unlock(&info->read_mutex);
+out:
+ mutex_unlock(&info->mutex);
+
+ return ret;
+}
+
+static unsigned int s3fhrn2_poll(struct file *file, poll_table *wait)
+{
+ struct s3fhrn2_info *info = container_of(file->private_data,
+ struct s3fhrn2_info, miscdev);
+ struct i2c_client *client = info->i2c_dev;
+ int ret = 0;
+ enum s3fhrn2_irq irq;
+
+ dev_dbg(&client->dev, "%s: info: %p\n", __func__, info);
+
+ mutex_lock(&info->mutex);
+
+ if (info->state == S3FHRN2_ST_OFF) {
+ dev_err(&client->dev, "s3fhrn2 is not enabled\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ poll_wait(file, &info->read_wait, wait);
+
+ mutex_lock(&info->read_mutex);
+ irq = info->read_irq;
+ mutex_unlock(&info->read_mutex);
+ if (irq == S3FHRN2_INT)
+ ret = (POLLIN | POLLRDNORM);
+
+out:
+ mutex_unlock(&info->mutex);
+
+ return ret;
+}
+
+static ssize_t s3fhrn2_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct s3fhrn2_info *info = container_of(file->private_data,
+ struct s3fhrn2_info, miscdev);
+ struct i2c_client *client = info->i2c_dev;
+ int min, max;
+ int ret = 0;
+
+ dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__,
+ info, count);
+
+ mutex_lock(&info->mutex);
+
+ if (info->state == S3FHRN2_ST_OFF) {
+ dev_err(&client->dev, "s3fhrn2 is not enabled\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (count > info->buflen)
+ count = info->buflen;
+
+ min = (info->state == S3FHRN2_ST_FIRM) ?
+ S3FHRN2_FIRM_MIN_SIZE : S3FHRN2_MSG_MIN_SIZE;
+ max = (info->state == S3FHRN2_ST_FIRM) ?
+ S3FHRN2_FIRM_MAX_SIZE : S3FHRN2_MSG_MAX_SIZE;
+
+ if (count < min || count > max) {
+ dev_dbg(&client->dev, "user required wrong size\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (copy_from_user(info->buf, buf, count)) {
+ dev_err(&client->dev, "copy failed from user\n");
+ ret = -EFAULT;
+ goto out;
+ }
+
+ usleep_range(6000, 10000);
+ ret = i2c_master_send(client, info->buf, count);
+ dev_dbg(&client->dev, "send: %d\n", ret);
+
+ if (ret == -EREMOTEIO) {
+ ret = s3fhrn2_reset(info);
+ goto out;
+ }
+
+ if (ret != count) {
+ dev_dbg(&client->dev, "send failed: return: %d count: %d\n",
+ ret, count);
+ ret = -EREMOTEIO;
+ }
+
+out:
+ mutex_unlock(&info->mutex);
+
+ return ret;
+}
+
+static long s3fhrn2_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct s3fhrn2_info *info = container_of(file->private_data,
+ struct s3fhrn2_info, miscdev);
+ struct i2c_client *client = info->i2c_dev;
+ unsigned int mode = (unsigned int)arg;
+ int ret = 0;
+
+ dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n",
+ __func__, info, cmd);
+
+ mutex_lock(&info->mutex);
+
+ switch (cmd) {
+ case S3FHRN2_SET_MODE:
+ dev_dbg(&client->dev, "%s: s3fhrn2_SET_MODE\n", __func__);
+
+ if (info->state == mode)
+ break;
+
+ if (mode >= S3FHRN2_ST_COUNT) {
+ dev_err(&client->dev, "wrong state (%d)\n", mode);
+ ret = -EFAULT;
+ break;
+ }
+
+ ret = s3fhrn2_set_state(info, mode);
+ if (ret < 0) {
+ dev_err(&client->dev, "enable failed\n");
+ break;
+ }
+
+ break;
+ default:
+ dev_err(&client->dev, "Unknow ioctl 0x%x\n", cmd);
+ ret = -ENOIOCTLCMD;
+ break;
+ }
+
+ mutex_unlock(&info->mutex);
+
+ return ret;
+}
+
+static int s3fhrn2_open(struct inode *inode, struct file *file)
+{
+ struct s3fhrn2_info *info = container_of(file->private_data,
+ struct s3fhrn2_info, miscdev);
+ struct i2c_client *client = info->i2c_dev;
+ int ret = 0;
+
+ dev_dbg(&client->dev, "%s: info : %p, client %p\n", __func__,
+ info, info->i2c_dev);
+
+ mutex_lock(&info->mutex);
+ if (info->state != S3FHRN2_ST_OFF) {
+ dev_err(&client->dev, "s3fhrn2 is busy\n");
+ ret = -EBUSY;
+ goto out;
+ }
+
+ ret = s3fhrn2_set_state(info, S3FHRN2_ST_NORM);
+out:
+ mutex_unlock(&info->mutex);
+ return ret;
+}
+
+static int s3fhrn2_close(struct inode *inode, struct file *file)
+{
+ struct s3fhrn2_info *info = container_of(file->private_data,
+ struct s3fhrn2_info, miscdev);
+ struct i2c_client *client = info->i2c_dev;
+
+ dev_dbg(&client->dev, "%s: info: %p, client %p\n",
+ __func__, info, info->i2c_dev);
+
+ mutex_lock(&info->mutex);
+ s3fhrn2_set_state(info, S3FHRN2_ST_OFF);
+ mutex_unlock(&info->mutex);
+
+ return 0;
+}
+
+static const struct file_operations s3fhrn2_fops = {
+ .owner = THIS_MODULE,
+ .read = s3fhrn2_read,
+ .write = s3fhrn2_write,
+ .poll = s3fhrn2_poll,
+ .open = s3fhrn2_open,
+ .release = s3fhrn2_close,
+ .unlocked_ioctl = s3fhrn2_ioctl,
+};
+
+#ifdef CONFIG_PM
+static int s3fhrn2_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s3fhrn2_info *info = i2c_get_clientdata(client);
+ int ret = 0;
+
+ mutex_lock(&info->mutex);
+
+ if (info->state == S3FHRN2_ST_FIRM)
+ ret = -EPERM;
+
+ /*
+ suspend sequence.
+ */
+ mutex_unlock(&info->mutex);
+ return ret;
+}
+
+static int s3fhrn2_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s3fhrn2_info *info = i2c_get_clientdata(client);
+
+ /*
+ mutex_lock(&info->mutex);
+
+ resume sequence here
+
+ mutex_unlock(&info->mutex);
+ */
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(s3fhrn2_pm_ops, s3fhrn2_suspend, s3fhrn2_resume);
+#endif
+
+static int __devinit s3fhrn2_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct s3fhrn2_info *info;
+ struct s3fhrn2_platform_data *pdata;
+ int ret = 0;
+
+ info = kzalloc(sizeof(struct s3fhrn2_info), GFP_KERNEL);
+ if (!info) {
+ dev_err(&client->dev,
+ "failed to allocate memory for s3fhrn2_info\n");
+ ret = -ENOMEM;
+ goto err_info_alloc;
+ }
+
+
+ info->buflen = S3FHRN2_MAX_BUFFER_SIZE;
+ info->buf = kzalloc(S3FHRN2_MAX_BUFFER_SIZE, GFP_KERNEL);
+ if (!info->buf) {
+ dev_err(&client->dev,
+ "failed to allocate memory for s3fhrn2_info->buf\n");
+ ret = -ENOMEM;
+ goto err_buf_alloc;
+ }
+
+ info->i2c_dev = client;
+ info->state = S3FHRN2_ST_OFF;
+ info->read_irq = S3FHRN2_NONE;
+ mutex_init(&info->read_mutex);
+ mutex_init(&info->mutex);
+ init_waitqueue_head(&info->read_wait);
+ i2c_set_clientdata(client, info);
+ pdata = client->dev.platform_data;
+ if (!pdata) {
+ dev_err(&client->dev, "No platform data\n");
+ ret = -ENOMEM;
+ goto err_buf_alloc;
+ }
+
+ ret = request_threaded_irq(client->irq, NULL, s3fhrn2_irq_thread_fn,
+ IRQF_TRIGGER_RISING, S3FHRN2_DRIVER_NAME,
+ info);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to register IRQ handler\n");
+ goto err_irq_req;
+ }
+
+ info->miscdev.minor = MISC_DYNAMIC_MINOR;
+ info->miscdev.name = S3FHRN2_DRIVER_NAME;
+ info->miscdev.fops = &s3fhrn2_fops;
+ info->miscdev.parent = &client->dev;
+ ret = misc_register(&info->miscdev);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to register Device\n");
+ goto err_dev_reg;
+ }
+
+ ret = gpio_request(pdata->ven, "nfc_ven");
+ if (ret) {
+ dev_err(&client->dev, "failed to get gpio ven\n");
+ goto err_gpio_ven;
+ }
+
+ ret = gpio_request(pdata->firm, "nfc_firm");
+ if (ret) {
+ dev_err(&client->dev, "failed to get gpio firm\n");
+ goto err_gpio_firm;
+ }
+
+ gpio_direction_output(pdata->ven, 0);
+ gpio_direction_output(pdata->firm, 0);
+
+ dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n",
+ __func__, info, pdata, client);
+
+ return 0;
+
+err_gpio_firm:
+ gpio_free(pdata->ven);
+err_gpio_ven:
+err_dev_reg:
+err_irq_req:
+ kfree(info->buf);
+err_buf_alloc:
+ kfree(info);
+err_info_alloc:
+ return ret;
+}
+
+static int __devexit s3fhrn2_remove(struct i2c_client *client)
+{
+ struct s3fhrn2_info *info = i2c_get_clientdata(client);
+ struct s3fhrn2_platform_data *pdata = client->dev.platform_data;
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ misc_deregister(&info->miscdev);
+
+ if (info->state != S3FHRN2_ST_OFF) {
+ gpio_set_value(pdata->firm, 0);
+ gpio_set_value(pdata->ven, 0);
+ info->read_irq = S3FHRN2_NONE;
+ }
+
+ gpio_free(pdata->firm);
+ gpio_free(pdata->ven);
+
+ free_irq(client->irq, info);
+
+ kfree(info->buf);
+ kfree(info);
+
+ return 0;
+}
+
+static struct i2c_device_id s3fhrn2_id_table[] = {
+ { S3FHRN2_DRIVER_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, s3fhrn2_id_table);
+
+static struct i2c_driver s3fhrn2_driver = {
+ .driver = {
+ .name = S3FHRN2_DRIVER_NAME,
+#ifdef CONFIG_PM
+ .pm = &s3fhrn2_pm_ops,
+#endif
+ },
+ .probe = s3fhrn2_probe,
+ .id_table = s3fhrn2_id_table,
+ .remove = s3fhrn2_remove,
+};
+
+static int __init s3fhrn2_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&s3fhrn2_driver);
+
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void __exit s3fhrn2_exit(void)
+{
+ i2c_del_driver(&s3fhrn2_driver);
+}
+
+module_init(s3fhrn2_init);
+module_exit(s3fhrn2_exit);
+
+MODULE_DESCRIPTION("Samsung s3fhrn2 driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/nfc/s3fhrn2.h b/include/linux/nfc/s3fhrn2.h
new file mode 100644
index 0000000..2f8a619
--- /dev/null
+++ b/include/linux/nfc/s3fhrn2.h
@@ -0,0 +1,52 @@
+/*
+ * SAMSUNG NFC N2 Controller
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * Author: Woonki Lee <woonki84.lee@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/platform_device.h>
+
+#define S3FHRN2_DRIVER_NAME "snfc-n2"
+
+#define S3FHRN2_MAX_BUFFER_SIZE 512
+
+/* ioctl */
+#define S3FHRN2_MAGIC 'S'
+#define S3FHRN2_GET_MODE _IOW(S3FHRN2_MAGIC, 0, unsigned int)
+#define S3FHRN2_SET_MODE _IOW(S3FHRN2_MAGIC, 1, unsigned int)
+
+/* size */
+#define S3FHRN2_LLC_LENGTH 1
+#define S3FHRN2_MSG_MIN_SIZE 1 /* LLC length header is 1*/
+#define S3FHRN2_MSG_MAX_SIZE 0x21
+#define S3FHRN2_FIRM_MIN_SIZE 1
+#define S3FHRN2_FIRM_MAX_SIZE 129 /* length (1) + FW DATA (128) */
+
+/* check */
+#define S3FHRN2_IS_LENGTH(val) (val == S3FHRN2_LLC_LENGTH)
+
+/* wait for device stable */
+#define S3FHRN2_VEN_WAIT_TIME (200)
+
+/* gpio pin configuration */
+struct s3fhrn2_platform_data {
+ unsigned int irq;
+ unsigned int ven;
+ unsigned int firm;
+ void (*cfg_gpio)(struct platform_device *dev);
+};
+
+enum s3fhrn2_state {
+ S3FHRN2_ST_OFF = 0,
+ S3FHRN2_ST_NORM,
+ S3FHRN2_ST_FIRM,
+ S3FHRN2_ST_COUNT,
+};
+
--
1.7.1
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