NFC: Driver for NXP Semiconductors PN544 NFC chip.

Creates a new "Near Field Communication" subsystem in drivers/nfc.
http://en.wikipedia.org/wiki/Near_Field_Communication is useful ;)

This is a driver for the pn544 NFC device. The driver transfers
ETSI messages between the device and the user space.

Signed-off-by: Matti J. Aaltonen <matti.j.aaltonen@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 926 insertions, 0 deletions

diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
new file mode 100644
index 000000000000..ffedfd492754
--- /dev/null
+++ b/drivers/nfc/Kconfig
@@ -0,0 +1,30 @@
+#
+# Near Field Communication (NFC) devices
+#
+
+menuconfig NFC_DEVICES
+        bool "NFC devices"
+        default n
+        ---help---
+          You'll have to say Y if your computer contains an NFC device that
+          you want to use under Linux.
+
+          You can say N here if you don't have any Near Field Communication
+          devices connected to your computer.
+
+if NFC_DEVICES
+
+config PN544_NFC
+        tristate "PN544 NFC driver"
+        depends on I2C
+        select CRC_CCITT
+        default n
+        ---help---
+          Say yes if you want PN544 Near Field Communication driver.
+          This is for i2c connected version. If unsure, say N here.
+
+          To compile this driver as a module, choose m here. The module will
+          be called pn544.
+
+
+endif # NFC_DEVICES
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
new file mode 100644
index 000000000000..a4efb164ec49
--- /dev/null
+++ b/drivers/nfc/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for nfc devices
+#
+
+obj-$(CONFIG_PN544_NFC)         += pn544.o
diff --git a/drivers/nfc/pn544.c b/drivers/nfc/pn544.c
new file mode 100644
index 000000000000..401c44b6eadb
--- /dev/null
+++ b/drivers/nfc/pn544.c
@@ -0,0 +1,891 @@
+/*
+ * Driver for the PN544 NFC chip.
+ *
+ * Copyright (C) Nokia Corporation
+ *
+ * Author: Jari Vanhala <ext-jari.vanhala@nokia.com>
+ * Contact: Matti Aaltonen <matti.j.aaltonen@nokia.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/completion.h>
+#include <linux/crc-ccitt.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/nfc/pn544.h>
+#include <linux/poll.h>
+#include <linux/regulator/consumer.h>
+#include <linux/serial_core.h> /* for TCGETS */
+#include <linux/slab.h>
+
+#define DRIVER_CARD     "PN544 NFC"
+#define DRIVER_DESC     "NFC driver for PN544"
+
+static struct i2c_device_id pn544_id_table[] = {
+        { PN544_DRIVER_NAME, 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, pn544_id_table);
+
+#define HCI_MODE        0
+#define FW_MODE         1
+
+enum pn544_state {
+        PN544_ST_COLD,
+        PN544_ST_FW_READY,
+        PN544_ST_READY,
+};
+
+enum pn544_irq {
+        PN544_NONE,
+        PN544_INT,
+};
+
+struct pn544_info {
+        struct miscdevice miscdev;
+        struct i2c_client *i2c_dev;
+        struct regulator_bulk_data regs[2];
+
+        enum pn544_state state;
+        wait_queue_head_t read_wait;
+        loff_t read_offset;
+        enum pn544_irq read_irq;
+        struct mutex read_mutex; /* Serialize read_irq access */
+        struct mutex mutex; /* Serialize info struct access */
+        u8 *buf;
+        unsigned int buflen;
+};
+
+static const char reg_vdd_io[]  = "Vdd_IO";
+static const char reg_vbat[]    = "VBat";
+
+/* sysfs interface */
+static ssize_t pn544_test(struct device *dev,
+                          struct device_attribute *attr, char *buf)
+{
+        struct pn544_info *info = dev_get_drvdata(dev);
+        struct i2c_client *client = info->i2c_dev;
+        struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", pdata->test());
+}
+
+static int pn544_enable(struct pn544_info *info, int mode)
+{
+        struct pn544_nfc_platform_data *pdata;
+        struct i2c_client *client = info->i2c_dev;
+
+        int r;
+
+        r = regulator_bulk_enable(ARRAY_SIZE(info->regs), info->regs);
+        if (r < 0)
+                return r;
+
+        pdata = client->dev.platform_data;
+        info->read_irq = PN544_NONE;
+        if (pdata->enable)
+                pdata->enable(mode);
+
+        if (mode) {
+                info->state = PN544_ST_FW_READY;
+                dev_dbg(&client->dev, "now in FW-mode\n");
+        } else {
+                info->state = PN544_ST_READY;
+                dev_dbg(&client->dev, "now in HCI-mode\n");
+        }
+
+        usleep_range(10000, 15000);
+
+        return 0;
+}
+
+static void pn544_disable(struct pn544_info *info)
+{
+        struct pn544_nfc_platform_data *pdata;
+        struct i2c_client *client = info->i2c_dev;
+
+        pdata = client->dev.platform_data;
+        if (pdata->disable)
+                pdata->disable();
+
+        info->state = PN544_ST_COLD;
+
+        dev_dbg(&client->dev, "Now in OFF-mode\n");
+
+        msleep(PN544_RESETVEN_TIME);
+
+        info->read_irq = PN544_NONE;
+        regulator_bulk_disable(ARRAY_SIZE(info->regs), info->regs);
+}
+
+static int check_crc(u8 *buf, int buflen)
+{
+        u8 len;
+        u16 crc;
+
+        len = buf[0] + 1;
+        if (len < 4 || len != buflen || len > PN544_MSG_MAX_SIZE) {
+                pr_err(PN544_DRIVER_NAME
+                       ": CRC; corrupt packet len %u (%d)\n", len, buflen);
+                print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
+                               16, 2, buf, buflen, false);
+                return -EPERM;
+        }
+        crc = crc_ccitt(0xffff, buf, len - 2);
+        crc = ~crc;
+
+        if (buf[len-2] != (crc & 0xff) || buf[len-1] != (crc >> 8)) {
+                pr_err(PN544_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
+                       crc, buf[len-1], buf[len-2]);
+
+                print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
+                               16, 2, buf, buflen, false);
+                return -EPERM;
+        }
+        return 0;
+}
+
+static int pn544_i2c_write(struct i2c_client *client, u8 *buf, int len)
+{
+        int r;
+
+        if (len < 4 || len != (buf[0] + 1)) {
+                dev_err(&client->dev, "%s: Illegal message length: %d\n",
+                        __func__, len);
+                return -EINVAL;
+        }
+
+        if (check_crc(buf, len))
+                return -EINVAL;
+
+        usleep_range(3000, 6000);
+
+        r = i2c_master_send(client, buf, len);
+        dev_dbg(&client->dev, "send: %d\n", r);
+
+        if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+                usleep_range(6000, 10000);
+                r = i2c_master_send(client, buf, len);
+                dev_dbg(&client->dev, "send2: %d\n", r);
+        }
+
+        if (r != len)
+                return -EREMOTEIO;
+
+        return r;
+}
+
+static int pn544_i2c_read(struct i2c_client *client, u8 *buf, int buflen)
+{
+        int r;
+        u8 len;
+
+        /*
+         * You could read a packet in one go, but then you'd need to read
+         * max size and rest would be 0xff fill, so we do split reads.
+         */
+        r = i2c_master_recv(client, &len, 1);
+        dev_dbg(&client->dev, "recv1: %d\n", r);
+
+        if (r != 1)
+                return -EREMOTEIO;
+
+        if (len < PN544_LLC_HCI_OVERHEAD)
+                len = PN544_LLC_HCI_OVERHEAD;
+        else if (len > (PN544_MSG_MAX_SIZE - 1))
+                len = PN544_MSG_MAX_SIZE - 1;
+
+        if (1 + len > buflen) /* len+(data+crc16) */
+                return -EMSGSIZE;
+
+        buf[0] = len;
+
+        r = i2c_master_recv(client, buf + 1, len);
+        dev_dbg(&client->dev, "recv2: %d\n", r);
+
+        if (r != len)
+                return -EREMOTEIO;
+
+        usleep_range(3000, 6000);
+
+        return r + 1;
+}
+
+static int pn544_fw_write(struct i2c_client *client, u8 *buf, int len)
+{
+        int r;
+
+        dev_dbg(&client->dev, "%s\n", __func__);
+
+        if (len < PN544_FW_HEADER_SIZE ||
+            (PN544_FW_HEADER_SIZE + (buf[1] << 8) + buf[2]) != len)
+                return -EINVAL;
+
+        r = i2c_master_send(client, buf, len);
+        dev_dbg(&client->dev, "fw send: %d\n", r);
+
+        if (r == -EREMOTEIO) { /* Retry, chip was in standby */
+                usleep_range(6000, 10000);
+                r = i2c_master_send(client, buf, len);
+                dev_dbg(&client->dev, "fw send2: %d\n", r);
+        }
+
+        if (r != len)
+                return -EREMOTEIO;
+
+        return r;
+}
+
+static int pn544_fw_read(struct i2c_client *client, u8 *buf, int buflen)
+{
+        int r, len;
+
+        if (buflen < PN544_FW_HEADER_SIZE)
+                return -EINVAL;
+
+        r = i2c_master_recv(client, buf, PN544_FW_HEADER_SIZE);
+        dev_dbg(&client->dev, "FW recv1: %d\n", r);
+
+        if (r < 0)
+                return r;
+
+        if (r < PN544_FW_HEADER_SIZE)
+                return -EINVAL;
+
+        len = (buf[1] << 8) + buf[2];
+        if (len == 0) /* just header, no additional data */
+                return r;
+
+        if (len > buflen - PN544_FW_HEADER_SIZE)
+                return -EMSGSIZE;
+
+        r = i2c_master_recv(client, buf + PN544_FW_HEADER_SIZE, len);
+        dev_dbg(&client->dev, "fw recv2: %d\n", r);
+
+        if (r != len)
+                return -EINVAL;
+
+        return r + PN544_FW_HEADER_SIZE;
+}
+
+static irqreturn_t pn544_irq_thread_fn(int irq, void *dev_id)
+{
+        struct pn544_info *info = dev_id;
+        struct i2c_client *client = info->i2c_dev;
+
+        BUG_ON(!info);
+        BUG_ON(irq != info->i2c_dev->irq);
+
+        dev_dbg(&client->dev, "IRQ\n");
+
+        mutex_lock(&info->read_mutex);
+        info->read_irq = PN544_INT;
+        mutex_unlock(&info->read_mutex);
+
+        wake_up_interruptible(&info->read_wait);
+
+        return IRQ_HANDLED;
+}
+
+static enum pn544_irq pn544_irq_state(struct pn544_info *info)
+{
+        enum pn544_irq irq;
+
+        mutex_lock(&info->read_mutex);
+        irq = info->read_irq;
+        mutex_unlock(&info->read_mutex);
+        /*
+         * XXX: should we check GPIO-line status directly?
+         * return pdata->irq_status() ? PN544_INT : PN544_NONE;
+         */
+
+        return irq;
+}
+
+static ssize_t pn544_read(struct file *file, char __user *buf,
+                          size_t count, loff_t *offset)
+{
+        struct pn544_info *info = container_of(file->private_data,
+                                               struct pn544_info, miscdev);
+        struct i2c_client *client = info->i2c_dev;
+        enum pn544_irq irq;
+        size_t len;
+        int r = 0;
+
+        dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__,
+                info, count);
+
+        mutex_lock(&info->mutex);
+
+        if (info->state == PN544_ST_COLD) {
+                r = -ENODEV;
+                goto out;
+        }
+
+        irq = pn544_irq_state(info);
+        if (irq == PN544_NONE) {
+                if (file->f_flags & O_NONBLOCK) {
+                        r = -EAGAIN;
+                        goto out;
+                }
+
+                if (wait_event_interruptible(info->read_wait,
+                                             (info->read_irq == PN544_INT))) {
+                        r = -ERESTARTSYS;
+                        goto out;
+                }
+        }
+
+        if (info->state == PN544_ST_FW_READY) {
+                len = min(count, info->buflen);
+
+                mutex_lock(&info->read_mutex);
+                r = pn544_fw_read(info->i2c_dev, info->buf, len);
+                info->read_irq = PN544_NONE;
+                mutex_unlock(&info->read_mutex);
+
+                if (r < 0) {
+                        dev_err(&info->i2c_dev->dev, "FW read failed: %d\n", r);
+                        goto out;
+                }
+
+                print_hex_dump(KERN_DEBUG, "FW read: ", DUMP_PREFIX_NONE,
+                               16, 2, info->buf, r, false);
+
+                *offset += r;
+                if (copy_to_user(buf, info->buf, r)) {
+                        r = -EFAULT;
+                        goto out;
+                }
+        } else {
+                len = min(count, info->buflen);
+
+                mutex_lock(&info->read_mutex);
+                r = pn544_i2c_read(info->i2c_dev, info->buf, len);
+                info->read_irq = PN544_NONE;
+                mutex_unlock(&info->read_mutex);
+
+                if (r < 0) {
+                        dev_err(&info->i2c_dev->dev, "read failed (%d)\n", r);
+                        goto out;
+                }
+                print_hex_dump(KERN_DEBUG, "read: ", DUMP_PREFIX_NONE,
+                               16, 2, info->buf, r, false);
+
+                *offset += r;
+                if (copy_to_user(buf, info->buf, r)) {
+                        r = -EFAULT;
+                        goto out;
+                }
+        }
+
+out:
+        mutex_unlock(&info->mutex);
+
+        return r;
+}
+
+static unsigned int pn544_poll(struct file *file, poll_table *wait)
+{
+        struct pn544_info *info = container_of(file->private_data,
+                                               struct pn544_info, miscdev);
+        struct i2c_client *client = info->i2c_dev;
+        int r = 0;
+
+        dev_dbg(&client->dev, "%s: info: %p\n", __func__, info);
+
+        mutex_lock(&info->mutex);
+
+        if (info->state == PN544_ST_COLD) {
+                r = -ENODEV;
+                goto out;
+        }
+
+        poll_wait(file, &info->read_wait, wait);
+
+        if (pn544_irq_state(info) == PN544_INT) {
+                r = POLLIN | POLLRDNORM;
+                goto out;
+        }
+out:
+        mutex_unlock(&info->mutex);
+
+        return r;
+}
+
+static ssize_t pn544_write(struct file *file, const char __user *buf,
+                           size_t count, loff_t *ppos)
+{
+        struct pn544_info *info = container_of(file->private_data,
+                                               struct pn544_info, miscdev);
+        struct i2c_client *client = info->i2c_dev;
+        ssize_t len;
+        int r;
+
+        dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__,
+                info, count);
+
+        mutex_lock(&info->mutex);
+
+        if (info->state == PN544_ST_COLD) {
+                r = -ENODEV;
+                goto out;
+        }
+
+        /*
+         * XXX: should we detect rset-writes and clean possible
+         * read_irq state
+         */
+        if (info->state == PN544_ST_FW_READY) {
+                size_t fw_len;
+
+                if (count < PN544_FW_HEADER_SIZE) {
+                        r = -EINVAL;
+                        goto out;
+                }
+
+                len = min(count, info->buflen);
+                if (copy_from_user(info->buf, buf, len)) {
+                        r = -EFAULT;
+                        goto out;
+                }
+
+                print_hex_dump(KERN_DEBUG, "FW write: ", DUMP_PREFIX_NONE,
+                               16, 2, info->buf, len, false);
+
+                fw_len = PN544_FW_HEADER_SIZE + (info->buf[1] << 8) +
+                        info->buf[2];
+
+                if (len > fw_len) /* 1 msg at a time */
+                        len = fw_len;
+
+                r = pn544_fw_write(info->i2c_dev, info->buf, len);
+        } else {
+                if (count < PN544_LLC_MIN_SIZE) {
+                        r = -EINVAL;
+                        goto out;
+                }
+
+                len = min(count, info->buflen);
+                if (copy_from_user(info->buf, buf, len)) {
+                        r = -EFAULT;
+                        goto out;
+                }
+
+                print_hex_dump(KERN_DEBUG, "write: ", DUMP_PREFIX_NONE,
+                               16, 2, info->buf, len, false);
+
+                if (len > (info->buf[0] + 1)) /* 1 msg at a time */
+                        len  = info->buf[0] + 1;
+
+                r = pn544_i2c_write(info->i2c_dev, info->buf, len);
+        }
+out:
+        mutex_unlock(&info->mutex);
+
+        return r;
+
+}
+
+static long pn544_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct pn544_info *info = container_of(file->private_data,
+                                               struct pn544_info, miscdev);
+        struct i2c_client *client = info->i2c_dev;
+        struct pn544_nfc_platform_data *pdata;
+        unsigned int val;
+        int r = 0;
+
+        dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n", __func__, info, cmd);
+
+        mutex_lock(&info->mutex);
+
+        if (info->state == PN544_ST_COLD) {
+                r = -ENODEV;
+                goto out;
+        }
+
+        pdata = info->i2c_dev->dev.platform_data;
+        switch (cmd) {
+        case PN544_GET_FW_MODE:
+                dev_dbg(&client->dev, "%s:  PN544_GET_FW_MODE\n", __func__);
+
+                val = (info->state == PN544_ST_FW_READY);
+                if (copy_to_user((void __user *)arg, &val, sizeof(val))) {
+                        r = -EFAULT;
+                        goto out;
+                }
+
+                break;
+
+        case PN544_SET_FW_MODE:
+                dev_dbg(&client->dev, "%s:  PN544_SET_FW_MODE\n", __func__);
+
+                if (copy_from_user(&val, (void __user *)arg, sizeof(val))) {
+                        r = -EFAULT;
+                        goto out;
+                }
+
+                if (val) {
+                        if (info->state == PN544_ST_FW_READY)
+                                break;
+
+                        pn544_disable(info);
+                        r = pn544_enable(info, FW_MODE);
+                        if (r < 0)
+                                goto out;
+                } else {
+                        if (info->state == PN544_ST_READY)
+                                break;
+                        pn544_disable(info);
+                        r = pn544_enable(info, HCI_MODE);
+                        if (r < 0)
+                                goto out;
+                }
+                file->f_pos = info->read_offset;
+                break;
+
+        case TCGETS:
+                dev_dbg(&client->dev, "%s:  TCGETS\n", __func__);
+
+                r = -ENOIOCTLCMD;
+                break;
+
+        default:
+                dev_err(&client->dev, "Unknown ioctl 0x%x\n", cmd);
+                r = -ENOIOCTLCMD;
+                break;
+        }
+
+out:
+        mutex_unlock(&info->mutex);
+
+        return r;
+}
+
+static int pn544_open(struct inode *inode, struct file *file)
+{
+        struct pn544_info *info = container_of(file->private_data,
+                                               struct pn544_info, miscdev);
+        struct i2c_client *client = info->i2c_dev;
+        int r = 0;
+
+        dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
+                info, info->i2c_dev);
+
+        mutex_lock(&info->mutex);
+
+        /*
+         * Only 1 at a time.
+         * XXX: maybe user (counter) would work better
+         */
+        if (info->state != PN544_ST_COLD) {
+                r = -EBUSY;
+                goto out;
+        }
+
+        file->f_pos = info->read_offset;
+        r = pn544_enable(info, HCI_MODE);
+
+out:
+        mutex_unlock(&info->mutex);
+        return r;
+}
+
+static int pn544_close(struct inode *inode, struct file *file)
+{
+        struct pn544_info *info = container_of(file->private_data,
+                                               struct pn544_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);
+        pn544_disable(info);
+        mutex_unlock(&info->mutex);
+
+        return 0;
+}
+
+static const struct file_operations pn544_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .read           = pn544_read,
+        .write          = pn544_write,
+        .poll           = pn544_poll,
+        .open           = pn544_open,
+        .release        = pn544_close,
+        .unlocked_ioctl = pn544_ioctl,
+};
+
+#ifdef CONFIG_PM
+static int pn544_suspend(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct pn544_info *info;
+        int r = 0;
+
+        dev_info(&client->dev, "***\n%s: client %p\n***\n", __func__, client);
+
+        info = i2c_get_clientdata(client);
+        dev_info(&client->dev, "%s: info: %p, client %p\n", __func__,
+                 info, client);
+
+        mutex_lock(&info->mutex);
+
+        switch (info->state) {
+        case PN544_ST_FW_READY:
+                /* Do not suspend while upgrading FW, please! */
+                r = -EPERM;
+                break;
+
+        case PN544_ST_READY:
+                /*
+                 * CHECK: Device should be in standby-mode. No way to check?
+                 * Allowing low power mode for the regulator is potentially
+                 * dangerous if pn544 does not go to suspension.
+                 */
+                break;
+
+        case PN544_ST_COLD:
+                break;
+        };
+
+        mutex_unlock(&info->mutex);
+        return r;
+}
+
+static int pn544_resume(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct pn544_info *info = i2c_get_clientdata(client);
+        int r = 0;
+
+        dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
+                info, client);
+
+        mutex_lock(&info->mutex);
+
+        switch (info->state) {
+        case PN544_ST_READY:
+                /*
+                 * CHECK: If regulator low power mode is allowed in
+                 * pn544_suspend, we should go back to normal mode
+                 * here.
+                 */
+                break;
+
+        case PN544_ST_COLD:
+                break;
+
+        case PN544_ST_FW_READY:
+                break;
+        };
+
+        mutex_unlock(&info->mutex);
+
+        return r;
+}
+
+static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume);
+#endif
+
+static struct device_attribute pn544_attr =
+        __ATTR(nfc_test, S_IRUGO, pn544_test, NULL);
+
+static int __devinit pn544_probe(struct i2c_client *client,
+                                 const struct i2c_device_id *id)
+{
+        struct pn544_info *info;
+        struct pn544_nfc_platform_data *pdata;
+        int r = 0;
+
+        dev_dbg(&client->dev, "%s\n", __func__);
+        dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
+
+        /* private data allocation */
+        info = kzalloc(sizeof(struct pn544_info), GFP_KERNEL);
+        if (!info) {
+                dev_err(&client->dev,
+                        "Cannot allocate memory for pn544_info.\n");
+                r = -ENOMEM;
+                goto err_info_alloc;
+        }
+
+        info->buflen = max(PN544_MSG_MAX_SIZE, PN544_MAX_I2C_TRANSFER);
+        info->buf = kzalloc(info->buflen, GFP_KERNEL);
+        if (!info->buf) {
+                dev_err(&client->dev,
+                        "Cannot allocate memory for pn544_info->buf.\n");
+                r = -ENOMEM;
+                goto err_buf_alloc;
+        }
+
+        info->regs[0].supply = reg_vdd_io;
+        info->regs[1].supply = reg_vbat;
+        r = regulator_bulk_get(&client->dev, ARRAY_SIZE(info->regs),
+                                 info->regs);
+        if (r < 0)
+                goto err_kmalloc;
+
+        info->i2c_dev = client;
+        info->state = PN544_ST_COLD;
+        info->read_irq = PN544_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");
+                r = -EINVAL;
+                goto err_reg;
+        }
+
+        if (!pdata->request_resources) {
+                dev_err(&client->dev, "request_resources() missing\n");
+                r = -EINVAL;
+                goto err_reg;
+        }
+
+        r = pdata->request_resources(client);
+        if (r) {
+                dev_err(&client->dev, "Cannot get platform resources\n");
+                goto err_reg;
+        }
+
+        r = request_threaded_irq(client->irq, NULL, pn544_irq_thread_fn,
+                                 IRQF_TRIGGER_RISING, PN544_DRIVER_NAME,
+                                 info);
+        if (r < 0) {
+                dev_err(&client->dev, "Unable to register IRQ handler\n");
+                goto err_res;
+        }
+
+        /* If we don't have the test we don't need the sysfs file */
+        if (pdata->test) {
+                r = device_create_file(&client->dev, &pn544_attr);
+                if (r) {
+                        dev_err(&client->dev,
+                                "sysfs registration failed, error %d\n", r);
+                        goto err_irq;
+                }
+        }
+
+        info->miscdev.minor = MISC_DYNAMIC_MINOR;
+        info->miscdev.name = PN544_DRIVER_NAME;
+        info->miscdev.fops = &pn544_fops;
+        info->miscdev.parent = &client->dev;
+        r = misc_register(&info->miscdev);
+        if (r < 0) {
+                dev_err(&client->dev, "Device registration failed\n");
+                goto err_sysfs;
+        }
+
+        dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n",
+                __func__, info, pdata, client);
+
+        return 0;
+
+err_sysfs:
+        if (pdata->test)
+                device_remove_file(&client->dev, &pn544_attr);
+err_irq:
+        free_irq(client->irq, info);
+err_res:
+        if (pdata->free_resources)
+                pdata->free_resources();
+err_reg:
+        regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
+err_kmalloc:
+        kfree(info->buf);
+err_buf_alloc:
+        kfree(info);
+err_info_alloc:
+        return r;
+}
+
+static __devexit int pn544_remove(struct i2c_client *client)
+{
+        struct pn544_info *info = i2c_get_clientdata(client);
+        struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
+
+        dev_dbg(&client->dev, "%s\n", __func__);
+
+        misc_deregister(&info->miscdev);
+        if (pdata->test)
+                device_remove_file(&client->dev, &pn544_attr);
+
+        if (info->state != PN544_ST_COLD) {
+                if (pdata->disable)
+                        pdata->disable();
+
+                info->read_irq = PN544_NONE;
+        }
+
+        free_irq(client->irq, info);
+        if (pdata->free_resources)
+                pdata->free_resources();
+
+        regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
+        kfree(info->buf);
+        kfree(info);
+
+        return 0;
+}
+
+static struct i2c_driver pn544_driver = {
+        .driver = {
+                .name = PN544_DRIVER_NAME,
+#ifdef CONFIG_PM
+                .pm = &pn544_pm_ops,
+#endif
+        },
+        .probe = pn544_probe,
+        .id_table = pn544_id_table,
+        .remove = __devexit_p(pn544_remove),
+};
+
+static int __init pn544_init(void)
+{
+        int r;
+
+        pr_debug(DRIVER_DESC ": %s\n", __func__);
+
+        r = i2c_add_driver(&pn544_driver);
+        if (r) {
+                pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
+                return r;
+        }
+
+        return 0;
+}
+
+static void __exit pn544_exit(void)
+{
+        i2c_del_driver(&pn544_driver);
+        pr_info(DRIVER_DESC ", Exiting.\n");
+}
+
+module_init(pn544_init);
+module_exit(pn544_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);