nfc: add support for brcm2079x driver

we have received this driver from BRCM support
website. Pushing driver in original.

Bug 1190304

Reviewed-on: http://git-master/r/172565
(cherry picked from commit 13def7b53c52f4c68f9d64c296ab0ac3810dc972)

Change-Id: I56f7a3e1391a78db73ed91527e21f717d0f599b3
Signed-off-by: Anita Kar <akar@nvidia.com>
Reviewed-on: http://git-master/r/187411
Reviewed-by: Rakesh Goyal <rgoyal@nvidia.com>
Tested-by: Rakesh Goyal <rgoyal@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

3 files changed, 533 insertions, 0 deletions

diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index 74a852e4e41f..10b176173a64 100644..100755
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -5,6 +5,17 @@
 menu "Near Field Communication (NFC) devices"
 	depends on NFC
 
+config BCM2079X_NFC
+    tristate "BCM2079X NFC driver"
+    depends on I2C
+    select CRC_CCITT
+    default n
+    ---help---
+        Say yes if you want BCM2079X 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 bcm2079x.
+
 config NFC_PN533
 	tristate "NXP PN533 USB driver"
 	depends on USB
@@ -18,6 +29,7 @@ config NFC_PN533
 config NFC_WILINK
 	tristate "Texas Instruments NFC WiLink driver"
 	depends on TI_ST && NFC_NCI
+	default n
 	help
 	  This enables the NFC driver for Texas Instrument's BT/FM/GPS/NFC
 	  combo devices. This makes use of shared transport line discipline
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index aa6bd657ef40..f71db78f9758 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_NFC_PN544)		+= pn544/
 obj-$(CONFIG_NFC_MICROREAD)	+= microread/
+obj-$(CONFIG_BCM2079X_NFC)	+= bcm2079x-i2c.o
 obj-$(CONFIG_NFC_PN533)		+= pn533.o
 obj-$(CONFIG_NFC_WILINK)	+= nfcwilink.o
 obj-$(CONFIG_NFC_MEI_PHY)	+= mei_phy.o
diff --git a/drivers/nfc/bcm2079x-i2c.c b/drivers/nfc/bcm2079x-i2c.c
new file mode 100755
index 000000000000..bf516d4348ee
--- /dev/null
+++ b/drivers/nfc/bcm2079x-i2c.c
@@ -0,0 +1,520 @@
+/*
+ * Copyright (C) 2012 Broadcom Corporation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/jiffies.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/miscdevice.h>
+#include <linux/spinlock.h>
+#include <linux/poll.h>
+#include <linux/version.h>
+
+#include <linux/nfc/bcm2079x.h>
+
+#define TRUE		1
+#define FALSE		0
+#define STATE_HIGH	1
+#define STATE_LOW	0
+
+/* end of compile options */
+
+/* do not change below */
+#define MAX_BUFFER_SIZE		780
+
+	/* Read data */
+#define PACKET_HEADER_SIZE_NCI	(4)
+#define PACKET_HEADER_SIZE_HCI	(3)
+#define PACKET_TYPE_NCI		(16)
+#define PACKET_TYPE_HCIEV	(4)
+#define MAX_PACKET_SIZE		(PACKET_HEADER_SIZE_NCI + 255)
+
+struct bcm2079x_dev {
+	wait_queue_head_t read_wq;
+	struct mutex read_mutex;
+	struct i2c_client *client;
+	struct miscdevice bcm2079x_device;
+	unsigned int wake_gpio;
+	unsigned int en_gpio;
+	unsigned int irq_gpio;
+	bool irq_enabled;
+	spinlock_t irq_enabled_lock;
+	unsigned int error_write;
+	unsigned int error_read;
+	unsigned int count_read;
+	unsigned int count_irq;
+    int original_address;
+};
+
+static void bcm2079x_init_stat(struct bcm2079x_dev *bcm2079x_dev)
+{
+	bcm2079x_dev->error_write = 0;
+	bcm2079x_dev->error_read = 0;
+	bcm2079x_dev->count_read = 0;
+	bcm2079x_dev->count_irq = 0;
+}
+
+static void bcm2079x_disable_irq(struct bcm2079x_dev *bcm2079x_dev)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags);
+	if (bcm2079x_dev->irq_enabled) {
+		disable_irq_nosync(bcm2079x_dev->client->irq);
+		bcm2079x_dev->irq_enabled = false;
+	}
+	spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags);
+}
+
+static void bcm2079x_enable_irq(struct bcm2079x_dev *bcm2079x_dev)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags);
+	if (!bcm2079x_dev->irq_enabled) {
+		bcm2079x_dev->irq_enabled = true;
+		enable_irq(bcm2079x_dev->client->irq);
+	}
+	spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags);
+}
+
+/*
+ The alias address 0x79, when sent as a 7-bit address from the host processor
+ will match the first byte (highest 2 bits) of the default client address
+ (0x1FA) that is programmed in bcm20791.
+ When used together with the first byte (0xFA) of the byte sequence below,
+ it can be used to address the bcm20791 in a system that does not support
+ 10-bit address and change the default address to 0x38.
+ the new address can be changed by changing the CLIENT_ADDRESS below if 0x38
+ conflicts with other device on the same i2c bus.
+ */
+#define ALIAS_ADDRESS	  0x79
+
+static void set_client_addr(struct bcm2079x_dev *bcm2079x_dev, int addr)
+{
+	struct i2c_client *client = bcm2079x_dev->client;
+	client->addr = addr;
+	if (addr > 0x7F)
+		client->flags |= I2C_CLIENT_TEN;
+    else
+		client->flags &= ~I2C_CLIENT_TEN;
+
+	dev_info(&client->dev,
+		"set_client_addr changed to (0x%04X) flag = %04x\n",
+		client->addr, client->flags);
+}
+
+static void change_client_addr(struct bcm2079x_dev *bcm2079x_dev, int addr)
+{
+	struct i2c_client *client;
+	int ret;
+	int i;
+	int offset = 1;
+	char addr_data[] = {
+        0xEE, 0xF2, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x00
+	};
+
+	client = bcm2079x_dev->client;
+	if ((client->flags & I2C_CLIENT_TEN) == I2C_CLIENT_TEN) {
+		client->addr = ALIAS_ADDRESS;
+		client->flags &= ~I2C_CLIENT_TEN;
+		offset = 0;
+	}
+
+	addr_data[5] = addr & 0xFF;
+	ret = 0;
+	for (i = 1; i < sizeof(addr_data) - 1; ++i)
+		ret += addr_data[i];
+	addr_data[sizeof(addr_data) - 1] = (ret & 0xFF);
+	dev_info(&client->dev,
+		 "change_client_addr from (0x%04X) flag = "\
+		 "%04x, addr_data[%d] = %02x\n",
+		 client->addr, client->flags, sizeof(addr_data) - 1,
+		 addr_data[sizeof(addr_data) - 1]);
+	ret = i2c_master_send(client, addr_data+offset, sizeof(addr_data)-offset);
+	client->addr = addr_data[5];
+	dev_info(&client->dev,
+		 "change_client_addr to (0x%04X) flag = %04x, ret = %d\n",
+		 client->addr, client->flags, ret);
+}
+
+static irqreturn_t bcm2079x_dev_irq_handler(int irq, void *dev_id)
+{
+	struct bcm2079x_dev *bcm2079x_dev = dev_id;
+	unsigned long flags;
+
+	spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags);
+	bcm2079x_dev->count_irq++;
+	spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags);
+	wake_up(&bcm2079x_dev->read_wq);
+
+	return IRQ_HANDLED;
+}
+
+static unsigned int bcm2079x_dev_poll(struct file *filp, poll_table *wait)
+{
+	struct bcm2079x_dev *bcm2079x_dev = filp->private_data;
+	unsigned int mask = 0;
+	unsigned long flags;
+
+	poll_wait(filp, &bcm2079x_dev->read_wq, wait);
+
+	spin_lock_irqsave(&bcm2079x_dev->irq_enabled_lock, flags);
+	if (bcm2079x_dev->count_irq > 0)
+		mask |= POLLIN | POLLRDNORM;
+	spin_unlock_irqrestore(&bcm2079x_dev->irq_enabled_lock, flags);
+
+	return mask;
+}
+
+static ssize_t bcm2079x_dev_read(struct file *filp, char __user *buf,
+				  size_t count, loff_t *offset)
+{
+	struct bcm2079x_dev *bcm2079x_dev = filp->private_data;
+	unsigned char tmp[MAX_BUFFER_SIZE];
+	int total, len, ret;
+
+	total = 0;
+	len = 0;
+	if (bcm2079x_dev->count_irq > 0)
+		bcm2079x_dev->count_irq--;
+
+	bcm2079x_dev->count_read++;
+	if (count > MAX_BUFFER_SIZE)
+		count = MAX_BUFFER_SIZE;
+
+	mutex_lock(&bcm2079x_dev->read_mutex);
+
+	/** Read the first 4 bytes to include the length of the NCI or HCI packet.
+	**/
+	ret = i2c_master_recv(bcm2079x_dev->client, tmp, 4);
+	if (ret == 4) {
+		total = ret;
+		/** First byte is the packet type
+		**/
+		switch(tmp[0]) {
+			case PACKET_TYPE_NCI:
+				len = tmp[PACKET_HEADER_SIZE_NCI-1];
+				break;
+
+			case PACKET_TYPE_HCIEV:
+				len = tmp[PACKET_HEADER_SIZE_HCI-1];
+				if (len == 0)
+					total--;				/*Since payload is 0, decrement total size (from 4 to 3) */
+				else
+					len--;					/*First byte of payload is in tmp[3] already */
+				break;
+
+			default:
+				len = 0;					/*Unknown packet byte */
+				break;
+		} /* switch*/
+
+		/** make sure full packet fits in the buffer
+		**/
+		if (len > 0 && (len + total) <= count) {
+			/** read the remainder of the packet.
+			**/
+			ret = i2c_master_recv(bcm2079x_dev->client, tmp+total, len);
+			if (ret == len)
+				total += len;
+		} /* if */
+	} /* if */
+
+	mutex_unlock(&bcm2079x_dev->read_mutex);
+
+	if (total > count || copy_to_user(buf, tmp, total)) {
+		dev_err(&bcm2079x_dev->client->dev,
+			"failed to copy to user space, total = %d\n", total);
+		total = -EFAULT;
+		bcm2079x_dev->error_read++;
+	}
+
+	return total;
+}
+
+static ssize_t bcm2079x_dev_write(struct file *filp, const char __user *buf,
+				   size_t count, loff_t *offset)
+{
+	struct bcm2079x_dev *bcm2079x_dev = filp->private_data;
+	char tmp[MAX_BUFFER_SIZE];
+	int ret;
+
+	if (count > MAX_BUFFER_SIZE) {
+		dev_err(&bcm2079x_dev->client->dev, "out of memory\n");
+		return -ENOMEM;
+	}
+
+	if (copy_from_user(tmp, buf, count)) {
+		dev_err(&bcm2079x_dev->client->dev,
+			"failed to copy from user space\n");
+		return -EFAULT;
+	}
+
+	mutex_lock(&bcm2079x_dev->read_mutex);
+	/* Write data */
+
+	ret = i2c_master_send(bcm2079x_dev->client, tmp, count);
+	if (ret != count) {
+        dev_err(&bcm2079x_dev->client->dev,
+            "failed to write %d\n", ret);
+        ret = -EIO;
+        bcm2079x_dev->error_write++;
+	}
+	mutex_unlock(&bcm2079x_dev->read_mutex);
+
+	return ret;
+}
+
+static int bcm2079x_dev_open(struct inode *inode, struct file *filp)
+{
+	int ret = 0;
+
+	struct bcm2079x_dev *bcm2079x_dev = container_of(filp->private_data,
+							   struct bcm2079x_dev,
+							   bcm2079x_device);
+	filp->private_data = bcm2079x_dev;
+	bcm2079x_init_stat(bcm2079x_dev);
+	bcm2079x_enable_irq(bcm2079x_dev);
+	dev_info(&bcm2079x_dev->client->dev,
+		 "device node major=%d, minor=%d\n", imajor(inode), iminor(inode));
+
+	return ret;
+}
+
+static long bcm2079x_dev_unlocked_ioctl(struct file *filp,
+					 unsigned int cmd, unsigned long arg)
+{
+	struct bcm2079x_dev *bcm2079x_dev = filp->private_data;
+
+	switch (cmd) {
+	case BCMNFC_READ_FULL_PACKET:
+		break;
+	case BCMNFC_READ_MULTI_PACKETS:
+		break;
+	case BCMNFC_CHANGE_ADDR:
+		dev_info(&bcm2079x_dev->client->dev,
+			 "%s, BCMNFC_CHANGE_ADDR (%x, %lx):\n", __func__, cmd,
+			 arg);
+		change_client_addr(bcm2079x_dev, arg);
+		break;
+	case BCMNFC_POWER_CTL:
+		dev_info(&bcm2079x_dev->client->dev,
+			 "%s, BCMNFC_POWER_CTL (%x, %lx):\n", __func__, cmd,
+			 arg);
+		if (arg == 1) set_client_addr(bcm2079x_dev, bcm2079x_dev->original_address);
+		gpio_set_value(bcm2079x_dev->en_gpio, arg);
+		break;
+	case BCMNFC_WAKE_CTL:
+		dev_info(&bcm2079x_dev->client->dev,
+			 "%s, BCMNFC_WAKE_CTL (%x, %lx):\n", __func__, cmd,
+			 arg);
+		gpio_set_value(bcm2079x_dev->wake_gpio, arg);
+		break;
+	default:
+		dev_err(&bcm2079x_dev->client->dev,
+			"%s, unknown cmd (%x, %lx)\n", __func__, cmd, arg);
+		return 0;
+	}
+
+	return 0;
+}
+
+static const struct file_operations bcm2079x_dev_fops = {
+	.owner = THIS_MODULE,
+	.llseek = no_llseek,
+	.poll = bcm2079x_dev_poll,
+	.read = bcm2079x_dev_read,
+	.write = bcm2079x_dev_write,
+	.open = bcm2079x_dev_open,
+	.unlocked_ioctl = bcm2079x_dev_unlocked_ioctl
+};
+
+static int bcm2079x_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	int ret;
+	struct bcm2079x_platform_data *platform_data;
+	struct bcm2079x_dev *bcm2079x_dev;
+
+	platform_data = client->dev.platform_data;
+
+	dev_info(&client->dev, "%s, probing bcm2079x driver flags = %x\n", __func__, client->flags);
+	if (platform_data == NULL) {
+		dev_err(&client->dev, "nfc probe fail\n");
+		return -ENODEV;
+	}
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "need I2C_FUNC_I2C\n");
+		return -ENODEV;
+	}
+
+	ret = gpio_request(platform_data->irq_gpio, "I2C_REQ");
+	if (ret)
+        return -ENODEV;
+	ret = gpio_request(platform_data->en_gpio, "REG_PU");
+	if (ret)
+		goto err_en;
+	ret = gpio_request(platform_data->wake_gpio, "NFC_WAKE");
+	if (ret)
+        goto err_firm;
+
+	bcm2079x_dev = kzalloc(sizeof(*bcm2079x_dev), GFP_KERNEL);
+	if (bcm2079x_dev == NULL) {
+		dev_err(&client->dev,
+			"failed to allocate memory for module data\n");
+		ret = -ENOMEM;
+		goto err_exit;
+	}
+
+	bcm2079x_dev->wake_gpio = platform_data->wake_gpio;
+	bcm2079x_dev->irq_gpio = platform_data->irq_gpio;
+	bcm2079x_dev->en_gpio = platform_data->en_gpio;
+	bcm2079x_dev->client = client;
+
+	ret = gpio_direction_input(bcm2079x_dev->irq_gpio);
+	if (ret < 0) {
+		pr_err("%s : not able to set I2C_REQ as input\n", __func__);
+		goto err_en;
+	}
+	ret = gpio_direction_output(bcm2079x_dev->en_gpio, 0);
+	if (ret < 0) {
+		pr_err("%s : not able to set REG_PU as output\n", __func__);
+		goto err_firm;
+	}
+    ret = gpio_direction_output(bcm2079x_dev->wake_gpio, 0);
+    if (ret < 0) {
+        pr_err("%s : not able to set NFC_WAKE as output\n", __func__);
+        goto err_exit;
+    }
+
+	gpio_set_value(platform_data->en_gpio, 0);
+	gpio_set_value(platform_data->wake_gpio, 0);
+
+	/* init mutex and queues */
+	init_waitqueue_head(&bcm2079x_dev->read_wq);
+	mutex_init(&bcm2079x_dev->read_mutex);
+	spin_lock_init(&bcm2079x_dev->irq_enabled_lock);
+
+	bcm2079x_dev->bcm2079x_device.minor = MISC_DYNAMIC_MINOR;
+	bcm2079x_dev->bcm2079x_device.name = "bcm2079x";
+	bcm2079x_dev->bcm2079x_device.fops = &bcm2079x_dev_fops;
+
+	ret = misc_register(&bcm2079x_dev->bcm2079x_device);
+	if (ret) {
+		dev_err(&client->dev, "misc_register failed\n");
+		goto err_misc_register;
+	}
+	dev_info(&client->dev,
+		 "%s, saving address 0x%02x\n",
+		 __func__, client->addr);
+    bcm2079x_dev->original_address = client->addr;
+
+	/* request irq.  the irq is set whenever the chip has data available
+	 * for reading.  it is cleared when all data has been read.
+	 */
+	dev_info(&client->dev, "requesting IRQ %d with IRQF_NO_SUSPEND\n", client->irq);
+	bcm2079x_dev->irq_enabled = true;
+	ret = request_irq(client->irq, bcm2079x_dev_irq_handler,
+			  IRQF_TRIGGER_RISING|IRQF_NO_SUSPEND, client->name, bcm2079x_dev);
+	if (ret) {
+		dev_err(&client->dev, "request_irq failed\n");
+		goto err_request_irq_failed;
+	}
+	bcm2079x_disable_irq(bcm2079x_dev);
+	i2c_set_clientdata(client, bcm2079x_dev);
+	dev_info(&client->dev,
+		 "%s, probing bcm2079x driver exited successfully\n",
+		 __func__);
+	return 0;
+
+err_request_irq_failed:
+	misc_deregister(&bcm2079x_dev->bcm2079x_device);
+err_misc_register:
+	mutex_destroy(&bcm2079x_dev->read_mutex);
+	kfree(bcm2079x_dev);
+err_exit:
+	gpio_free(platform_data->wake_gpio);
+err_firm:
+	gpio_free(platform_data->en_gpio);
+err_en:
+	gpio_free(platform_data->irq_gpio);
+	return ret;
+}
+
+static int bcm2079x_remove(struct i2c_client *client)
+{
+	struct bcm2079x_dev *bcm2079x_dev;
+
+	bcm2079x_dev = i2c_get_clientdata(client);
+	free_irq(client->irq, bcm2079x_dev);
+	misc_deregister(&bcm2079x_dev->bcm2079x_device);
+	mutex_destroy(&bcm2079x_dev->read_mutex);
+	gpio_free(bcm2079x_dev->irq_gpio);
+	gpio_free(bcm2079x_dev->en_gpio);
+	gpio_free(bcm2079x_dev->wake_gpio);
+	kfree(bcm2079x_dev);
+
+	return 0;
+}
+
+static const struct i2c_device_id bcm2079x_id[] = {
+	{"bcm2079x-i2c", 0},
+	{}
+};
+
+static struct i2c_driver bcm2079x_driver = {
+	.id_table = bcm2079x_id,
+	.probe = bcm2079x_probe,
+	.remove = bcm2079x_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "bcm2079x-i2c",
+	},
+};
+
+/*
+ * module load/unload record keeping
+ */
+
+static int __init bcm2079x_dev_init(void)
+{
+	return i2c_add_driver(&bcm2079x_driver);
+}
+module_init(bcm2079x_dev_init);
+
+static void __exit bcm2079x_dev_exit(void)
+{
+	i2c_del_driver(&bcm2079x_driver);
+}
+module_exit(bcm2079x_dev_exit);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("NFC bcm2079x driver");
+MODULE_LICENSE("GPL");