Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1156 insertions, 0 deletions

diff --git a/kernel/drivers/input/touchscreen/edt-ft5x06.c b/kernel/drivers/input/touchscreen/edt-ft5x06.c
new file mode 100644
index 000000000..e6aef3e48
--- /dev/null
+++ b/kernel/drivers/input/touchscreen/edt-ft5x06.c
@@ -0,0 +1,1156 @@
+/*
+ * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
+ * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
+ * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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 library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * This is a driver for the EDT "Polytouch" family of touch controllers
+ * based on the FocalTech FT5x06 line of chips.
+ *
+ * Development of this driver has been sponsored by Glyn:
+ *    http://www.glyn.com/Products/Displays
+ */
+
+#include <linux/module.h>
+#include <linux/ratelimit.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/i2c.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/input/edt-ft5x06.h>
+
+#define MAX_SUPPORT_POINTS		5
+
+#define WORK_REGISTER_THRESHOLD		0x00
+#define WORK_REGISTER_REPORT_RATE	0x08
+#define WORK_REGISTER_GAIN		0x30
+#define WORK_REGISTER_OFFSET		0x31
+#define WORK_REGISTER_NUM_X		0x33
+#define WORK_REGISTER_NUM_Y		0x34
+
+#define M09_REGISTER_THRESHOLD		0x80
+#define M09_REGISTER_GAIN		0x92
+#define M09_REGISTER_OFFSET		0x93
+#define M09_REGISTER_NUM_X		0x94
+#define M09_REGISTER_NUM_Y		0x95
+
+#define NO_REGISTER			0xff
+
+#define WORK_REGISTER_OPMODE		0x3c
+#define FACTORY_REGISTER_OPMODE		0x01
+
+#define TOUCH_EVENT_DOWN		0x00
+#define TOUCH_EVENT_UP			0x01
+#define TOUCH_EVENT_ON			0x02
+#define TOUCH_EVENT_RESERVED		0x03
+
+#define EDT_NAME_LEN			23
+#define EDT_SWITCH_MODE_RETRIES		10
+#define EDT_SWITCH_MODE_DELAY		5 /* msec */
+#define EDT_RAW_DATA_RETRIES		100
+#define EDT_RAW_DATA_DELAY		1 /* msec */
+
+enum edt_ver {
+	M06,
+	M09,
+};
+
+struct edt_reg_addr {
+	int reg_threshold;
+	int reg_report_rate;
+	int reg_gain;
+	int reg_offset;
+	int reg_num_x;
+	int reg_num_y;
+};
+
+struct edt_ft5x06_ts_data {
+	struct i2c_client *client;
+	struct input_dev *input;
+	u16 num_x;
+	u16 num_y;
+
+	int reset_pin;
+	int irq_pin;
+	int wake_pin;
+
+#if defined(CONFIG_DEBUG_FS)
+	struct dentry *debug_dir;
+	u8 *raw_buffer;
+	size_t raw_bufsize;
+#endif
+
+	struct mutex mutex;
+	bool factory_mode;
+	int threshold;
+	int gain;
+	int offset;
+	int report_rate;
+
+	char name[EDT_NAME_LEN];
+
+	struct edt_reg_addr reg_addr;
+	enum edt_ver version;
+};
+
+static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
+				   u16 wr_len, u8 *wr_buf,
+				   u16 rd_len, u8 *rd_buf)
+{
+	struct i2c_msg wrmsg[2];
+	int i = 0;
+	int ret;
+
+	if (wr_len) {
+		wrmsg[i].addr  = client->addr;
+		wrmsg[i].flags = 0;
+		wrmsg[i].len = wr_len;
+		wrmsg[i].buf = wr_buf;
+		i++;
+	}
+	if (rd_len) {
+		wrmsg[i].addr  = client->addr;
+		wrmsg[i].flags = I2C_M_RD;
+		wrmsg[i].len = rd_len;
+		wrmsg[i].buf = rd_buf;
+		i++;
+	}
+
+	ret = i2c_transfer(client->adapter, wrmsg, i);
+	if (ret < 0)
+		return ret;
+	if (ret != i)
+		return -EIO;
+
+	return 0;
+}
+
+static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
+				    u8 *buf, int buflen)
+{
+	int i;
+	u8 crc = 0;
+
+	for (i = 0; i < buflen - 1; i++)
+		crc ^= buf[i];
+
+	if (crc != buf[buflen-1]) {
+		dev_err_ratelimited(&tsdata->client->dev,
+				    "crc error: 0x%02x expected, got 0x%02x\n",
+				    crc, buf[buflen-1]);
+		return false;
+	}
+
+	return true;
+}
+
+static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
+{
+	struct edt_ft5x06_ts_data *tsdata = dev_id;
+	struct device *dev = &tsdata->client->dev;
+	u8 cmd;
+	u8 rdbuf[29];
+	int i, type, x, y, id;
+	int offset, tplen, datalen;
+	int error;
+
+	switch (tsdata->version) {
+	case M06:
+		cmd = 0xf9; /* tell the controller to send touch data */
+		offset = 5; /* where the actual touch data starts */
+		tplen = 4;  /* data comes in so called frames */
+		datalen = 26; /* how much bytes to listen for */
+		break;
+
+	case M09:
+		cmd = 0x02;
+		offset = 1;
+		tplen = 6;
+		datalen = 29;
+		break;
+
+	default:
+		goto out;
+	}
+
+	memset(rdbuf, 0, sizeof(rdbuf));
+
+	error = edt_ft5x06_ts_readwrite(tsdata->client,
+					sizeof(cmd), &cmd,
+					datalen, rdbuf);
+	if (error) {
+		dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
+				    error);
+		goto out;
+	}
+
+	/* M09 does not send header or CRC */
+	if (tsdata->version == M06) {
+		if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
+			rdbuf[2] != datalen) {
+			dev_err_ratelimited(dev,
+					"Unexpected header: %02x%02x%02x!\n",
+					rdbuf[0], rdbuf[1], rdbuf[2]);
+			goto out;
+		}
+
+		if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
+			goto out;
+	}
+
+	for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
+		u8 *buf = &rdbuf[i * tplen + offset];
+		bool down;
+
+		type = buf[0] >> 6;
+		/* ignore Reserved events */
+		if (type == TOUCH_EVENT_RESERVED)
+			continue;
+
+		/* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
+		if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
+			continue;
+
+		x = ((buf[0] << 8) | buf[1]) & 0x0fff;
+		y = ((buf[2] << 8) | buf[3]) & 0x0fff;
+		id = (buf[2] >> 4) & 0x0f;
+		down = type != TOUCH_EVENT_UP;
+
+		input_mt_slot(tsdata->input, id);
+		input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
+
+		if (!down)
+			continue;
+
+		input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
+		input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
+	}
+
+	input_mt_report_pointer_emulation(tsdata->input, true);
+	input_sync(tsdata->input);
+
+out:
+	return IRQ_HANDLED;
+}
+
+static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
+				     u8 addr, u8 value)
+{
+	u8 wrbuf[4];
+
+	switch (tsdata->version) {
+	case M06:
+		wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
+		wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
+		wrbuf[2] = value;
+		wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
+		return edt_ft5x06_ts_readwrite(tsdata->client, 4,
+					wrbuf, 0, NULL);
+	case M09:
+		wrbuf[0] = addr;
+		wrbuf[1] = value;
+
+		return edt_ft5x06_ts_readwrite(tsdata->client, 2,
+					wrbuf, 0, NULL);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
+				    u8 addr)
+{
+	u8 wrbuf[2], rdbuf[2];
+	int error;
+
+	switch (tsdata->version) {
+	case M06:
+		wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
+		wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
+		wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
+
+		error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
+						rdbuf);
+		if (error)
+			return error;
+
+		if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
+			dev_err(&tsdata->client->dev,
+				"crc error: 0x%02x expected, got 0x%02x\n",
+				wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
+				rdbuf[1]);
+			return -EIO;
+		}
+		break;
+
+	case M09:
+		wrbuf[0] = addr;
+		error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
+						wrbuf, 1, rdbuf);
+		if (error)
+			return error;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return rdbuf[0];
+}
+
+struct edt_ft5x06_attribute {
+	struct device_attribute dattr;
+	size_t field_offset;
+	u8 limit_low;
+	u8 limit_high;
+	u8 addr_m06;
+	u8 addr_m09;
+};
+
+#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09,			\
+		_limit_low, _limit_high)				\
+	struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {	\
+		.dattr = __ATTR(_field, _mode,				\
+				edt_ft5x06_setting_show,		\
+				edt_ft5x06_setting_store),		\
+		.field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
+		.addr_m06 = _addr_m06,					\
+		.addr_m09 = _addr_m09,					\
+		.limit_low = _limit_low,				\
+		.limit_high = _limit_high,				\
+	}
+
+static ssize_t edt_ft5x06_setting_show(struct device *dev,
+				       struct device_attribute *dattr,
+				       char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+	struct edt_ft5x06_attribute *attr =
+			container_of(dattr, struct edt_ft5x06_attribute, dattr);
+	u8 *field = (u8 *)tsdata + attr->field_offset;
+	int val;
+	size_t count = 0;
+	int error = 0;
+	u8 addr;
+
+	mutex_lock(&tsdata->mutex);
+
+	if (tsdata->factory_mode) {
+		error = -EIO;
+		goto out;
+	}
+
+	switch (tsdata->version) {
+	case M06:
+		addr = attr->addr_m06;
+		break;
+
+	case M09:
+		addr = attr->addr_m09;
+		break;
+
+	default:
+		error = -ENODEV;
+		goto out;
+	}
+
+	if (addr != NO_REGISTER) {
+		val = edt_ft5x06_register_read(tsdata, addr);
+		if (val < 0) {
+			error = val;
+			dev_err(&tsdata->client->dev,
+				"Failed to fetch attribute %s, error %d\n",
+				dattr->attr.name, error);
+			goto out;
+		}
+	} else {
+		val = *field;
+	}
+
+	if (val != *field) {
+		dev_warn(&tsdata->client->dev,
+			 "%s: read (%d) and stored value (%d) differ\n",
+			 dattr->attr.name, val, *field);
+		*field = val;
+	}
+
+	count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
+out:
+	mutex_unlock(&tsdata->mutex);
+	return error ?: count;
+}
+
+static ssize_t edt_ft5x06_setting_store(struct device *dev,
+					struct device_attribute *dattr,
+					const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+	struct edt_ft5x06_attribute *attr =
+			container_of(dattr, struct edt_ft5x06_attribute, dattr);
+	u8 *field = (u8 *)tsdata + attr->field_offset;
+	unsigned int val;
+	int error;
+	u8 addr;
+
+	mutex_lock(&tsdata->mutex);
+
+	if (tsdata->factory_mode) {
+		error = -EIO;
+		goto out;
+	}
+
+	error = kstrtouint(buf, 0, &val);
+	if (error)
+		goto out;
+
+	if (val < attr->limit_low || val > attr->limit_high) {
+		error = -ERANGE;
+		goto out;
+	}
+
+	switch (tsdata->version) {
+	case M06:
+		addr = attr->addr_m06;
+		break;
+
+	case M09:
+		addr = attr->addr_m09;
+		break;
+
+	default:
+		error = -ENODEV;
+		goto out;
+	}
+
+	if (addr != NO_REGISTER) {
+		error = edt_ft5x06_register_write(tsdata, addr, val);
+		if (error) {
+			dev_err(&tsdata->client->dev,
+				"Failed to update attribute %s, error: %d\n",
+				dattr->attr.name, error);
+			goto out;
+		}
+	}
+	*field = val;
+
+out:
+	mutex_unlock(&tsdata->mutex);
+	return error ?: count;
+}
+
+static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
+		M09_REGISTER_GAIN, 0, 31);
+static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
+		M09_REGISTER_OFFSET, 0, 31);
+static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
+		M09_REGISTER_THRESHOLD, 20, 80);
+static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
+		NO_REGISTER, 3, 14);
+
+static struct attribute *edt_ft5x06_attrs[] = {
+	&edt_ft5x06_attr_gain.dattr.attr,
+	&edt_ft5x06_attr_offset.dattr.attr,
+	&edt_ft5x06_attr_threshold.dattr.attr,
+	&edt_ft5x06_attr_report_rate.dattr.attr,
+	NULL
+};
+
+static const struct attribute_group edt_ft5x06_attr_group = {
+	.attrs = edt_ft5x06_attrs,
+};
+
+#ifdef CONFIG_DEBUG_FS
+static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
+{
+	struct i2c_client *client = tsdata->client;
+	int retries = EDT_SWITCH_MODE_RETRIES;
+	int ret;
+	int error;
+
+	disable_irq(client->irq);
+
+	if (!tsdata->raw_buffer) {
+		tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
+				      sizeof(u16);
+		tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
+		if (!tsdata->raw_buffer) {
+			error = -ENOMEM;
+			goto err_out;
+		}
+	}
+
+	/* mode register is 0x3c when in the work mode */
+	if (tsdata->version == M09)
+		goto m09_out;
+
+	error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to switch to factory mode, error %d\n", error);
+		goto err_out;
+	}
+
+	tsdata->factory_mode = true;
+	do {
+		mdelay(EDT_SWITCH_MODE_DELAY);
+		/* mode register is 0x01 when in factory mode */
+		ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
+		if (ret == 0x03)
+			break;
+	} while (--retries > 0);
+
+	if (retries == 0) {
+		dev_err(&client->dev, "not in factory mode after %dms.\n",
+			EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
+		error = -EIO;
+		goto err_out;
+	}
+
+	return 0;
+
+err_out:
+	kfree(tsdata->raw_buffer);
+	tsdata->raw_buffer = NULL;
+	tsdata->factory_mode = false;
+	enable_irq(client->irq);
+
+	return error;
+
+m09_out:
+	dev_err(&client->dev, "No factory mode support for M09\n");
+	return -EINVAL;
+
+}
+
+static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
+{
+	struct i2c_client *client = tsdata->client;
+	int retries = EDT_SWITCH_MODE_RETRIES;
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+	int ret;
+	int error;
+
+	/* mode register is 0x01 when in the factory mode */
+	error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to switch to work mode, error: %d\n", error);
+		return error;
+	}
+
+	tsdata->factory_mode = false;
+
+	do {
+		mdelay(EDT_SWITCH_MODE_DELAY);
+		/* mode register is 0x01 when in factory mode */
+		ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
+		if (ret == 0x01)
+			break;
+	} while (--retries > 0);
+
+	if (retries == 0) {
+		dev_err(&client->dev, "not in work mode after %dms.\n",
+			EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
+		tsdata->factory_mode = true;
+		return -EIO;
+	}
+
+	kfree(tsdata->raw_buffer);
+	tsdata->raw_buffer = NULL;
+
+	/* restore parameters */
+	edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
+				  tsdata->threshold);
+	edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
+				  tsdata->gain);
+	edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
+				  tsdata->offset);
+	if (reg_addr->reg_report_rate)
+		edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
+				  tsdata->report_rate);
+
+	enable_irq(client->irq);
+
+	return 0;
+}
+
+static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+
+	*mode = tsdata->factory_mode;
+
+	return 0;
+};
+
+static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+	int retval = 0;
+
+	if (mode > 1)
+		return -ERANGE;
+
+	mutex_lock(&tsdata->mutex);
+
+	if (mode != tsdata->factory_mode) {
+		retval = mode ? edt_ft5x06_factory_mode(tsdata) :
+				edt_ft5x06_work_mode(tsdata);
+	}
+
+	mutex_unlock(&tsdata->mutex);
+
+	return retval;
+};
+
+DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
+			edt_ft5x06_debugfs_mode_set, "%llu\n");
+
+static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
+				char __user *buf, size_t count, loff_t *off)
+{
+	struct edt_ft5x06_ts_data *tsdata = file->private_data;
+	struct i2c_client *client = tsdata->client;
+	int retries  = EDT_RAW_DATA_RETRIES;
+	int val, i, error;
+	size_t read = 0;
+	int colbytes;
+	char wrbuf[3];
+	u8 *rdbuf;
+
+	if (*off < 0 || *off >= tsdata->raw_bufsize)
+		return 0;
+
+	mutex_lock(&tsdata->mutex);
+
+	if (!tsdata->factory_mode || !tsdata->raw_buffer) {
+		error = -EIO;
+		goto out;
+	}
+
+	error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
+	if (error) {
+		dev_dbg(&client->dev,
+			"failed to write 0x08 register, error %d\n", error);
+		goto out;
+	}
+
+	do {
+		msleep(EDT_RAW_DATA_DELAY);
+		val = edt_ft5x06_register_read(tsdata, 0x08);
+		if (val < 1)
+			break;
+	} while (--retries > 0);
+
+	if (val < 0) {
+		error = val;
+		dev_dbg(&client->dev,
+			"failed to read 0x08 register, error %d\n", error);
+		goto out;
+	}
+
+	if (retries == 0) {
+		dev_dbg(&client->dev,
+			"timed out waiting for register to settle\n");
+		error = -ETIMEDOUT;
+		goto out;
+	}
+
+	rdbuf = tsdata->raw_buffer;
+	colbytes = tsdata->num_y * sizeof(u16);
+
+	wrbuf[0] = 0xf5;
+	wrbuf[1] = 0x0e;
+	for (i = 0; i < tsdata->num_x; i++) {
+		wrbuf[2] = i;  /* column index */
+		error = edt_ft5x06_ts_readwrite(tsdata->client,
+						sizeof(wrbuf), wrbuf,
+						colbytes, rdbuf);
+		if (error)
+			goto out;
+
+		rdbuf += colbytes;
+	}
+
+	read = min_t(size_t, count, tsdata->raw_bufsize - *off);
+	if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
+		error = -EFAULT;
+		goto out;
+	}
+
+	*off += read;
+out:
+	mutex_unlock(&tsdata->mutex);
+	return error ?: read;
+};
+
+static const struct file_operations debugfs_raw_data_fops = {
+	.open = simple_open,
+	.read = edt_ft5x06_debugfs_raw_data_read,
+};
+
+static void
+edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
+			      const char *debugfs_name)
+{
+	tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
+	if (!tsdata->debug_dir)
+		return;
+
+	debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
+	debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
+
+	debugfs_create_file("mode", S_IRUSR | S_IWUSR,
+			    tsdata->debug_dir, tsdata, &debugfs_mode_fops);
+	debugfs_create_file("raw_data", S_IRUSR,
+			    tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
+}
+
+static void
+edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
+{
+	debugfs_remove_recursive(tsdata->debug_dir);
+	kfree(tsdata->raw_buffer);
+}
+
+#else
+
+static inline void
+edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
+			      const char *debugfs_name)
+{
+}
+
+static inline void
+edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
+{
+}
+
+#endif /* CONFIG_DEBUGFS */
+
+static int edt_ft5x06_ts_reset(struct i2c_client *client,
+			struct edt_ft5x06_ts_data *tsdata)
+{
+	int error;
+
+	if (gpio_is_valid(tsdata->wake_pin)) {
+		error = devm_gpio_request_one(&client->dev,
+					tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
+					"edt-ft5x06 wake");
+		if (error) {
+			dev_err(&client->dev,
+				"Failed to request GPIO %d as wake pin, error %d\n",
+				tsdata->wake_pin, error);
+			return error;
+		}
+
+		msleep(5);
+		gpio_set_value(tsdata->wake_pin, 1);
+	}
+	if (gpio_is_valid(tsdata->reset_pin)) {
+		/* this pulls reset down, enabling the low active reset */
+		error = devm_gpio_request_one(&client->dev,
+					tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
+					"edt-ft5x06 reset");
+		if (error) {
+			dev_err(&client->dev,
+				"Failed to request GPIO %d as reset pin, error %d\n",
+				tsdata->reset_pin, error);
+			return error;
+		}
+
+		msleep(5);
+		gpio_set_value(tsdata->reset_pin, 1);
+		msleep(300);
+	}
+
+	return 0;
+}
+
+static int edt_ft5x06_ts_identify(struct i2c_client *client,
+					struct edt_ft5x06_ts_data *tsdata,
+					char *fw_version)
+{
+	u8 rdbuf[EDT_NAME_LEN];
+	char *p;
+	int error;
+	char *model_name = tsdata->name;
+
+	/* see what we find if we assume it is a M06 *
+	 * if we get less than EDT_NAME_LEN, we don't want
+	 * to have garbage in there
+	 */
+	memset(rdbuf, 0, sizeof(rdbuf));
+	error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
+					EDT_NAME_LEN - 1, rdbuf);
+	if (error)
+		return error;
+
+	/* if we find something consistent, stay with that assumption
+	 * at least M09 won't send 3 bytes here
+	 */
+	if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
+		tsdata->version = M06;
+
+		/* remove last '$' end marker */
+		rdbuf[EDT_NAME_LEN - 1] = '\0';
+		if (rdbuf[EDT_NAME_LEN - 2] == '$')
+			rdbuf[EDT_NAME_LEN - 2] = '\0';
+
+		/* look for Model/Version separator */
+		p = strchr(rdbuf, '*');
+		if (p)
+			*p++ = '\0';
+		strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
+		strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
+	} else {
+		/* since there are only two versions around (M06, M09) */
+		tsdata->version = M09;
+
+		error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
+						2, rdbuf);
+		if (error)
+			return error;
+
+		strlcpy(fw_version, rdbuf, 2);
+
+		error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
+						1, rdbuf);
+		if (error)
+			return error;
+
+		snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
+			rdbuf[0] >> 4, rdbuf[0] & 0x0F);
+	}
+
+	return 0;
+}
+
+#define EDT_ATTR_CHECKSET(name, reg) \
+do {								\
+	if (pdata->name >= edt_ft5x06_attr_##name.limit_low &&		\
+	    pdata->name <= edt_ft5x06_attr_##name.limit_high)		\
+		edt_ft5x06_register_write(tsdata, reg, pdata->name);	\
+} while (0)
+
+#define EDT_GET_PROP(name, reg) {				\
+	u32 val;						\
+	if (of_property_read_u32(np, #name, &val) == 0)		\
+		edt_ft5x06_register_write(tsdata, reg, val);	\
+}
+
+static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
+					struct edt_ft5x06_ts_data *tsdata)
+{
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+	EDT_GET_PROP(threshold, reg_addr->reg_threshold);
+	EDT_GET_PROP(gain, reg_addr->reg_gain);
+	EDT_GET_PROP(offset, reg_addr->reg_offset);
+}
+
+static void
+edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
+			   const struct edt_ft5x06_platform_data *pdata)
+{
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+	if (!pdata->use_parameters)
+		return;
+
+	/* pick up defaults from the platform data */
+	EDT_ATTR_CHECKSET(threshold, reg_addr->reg_threshold);
+	EDT_ATTR_CHECKSET(gain, reg_addr->reg_gain);
+	EDT_ATTR_CHECKSET(offset, reg_addr->reg_offset);
+	if (reg_addr->reg_report_rate != NO_REGISTER)
+		EDT_ATTR_CHECKSET(report_rate, reg_addr->reg_report_rate);
+}
+
+static void
+edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
+{
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+	tsdata->threshold = edt_ft5x06_register_read(tsdata,
+						     reg_addr->reg_threshold);
+	tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
+	tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
+	if (reg_addr->reg_report_rate != NO_REGISTER)
+		tsdata->report_rate = edt_ft5x06_register_read(tsdata,
+						reg_addr->reg_report_rate);
+	tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
+	tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
+}
+
+static void
+edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
+{
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+
+	switch (tsdata->version) {
+	case M06:
+		reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
+		reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
+		reg_addr->reg_gain = WORK_REGISTER_GAIN;
+		reg_addr->reg_offset = WORK_REGISTER_OFFSET;
+		reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
+		reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
+		break;
+
+	case M09:
+		reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
+		reg_addr->reg_gain = M09_REGISTER_GAIN;
+		reg_addr->reg_offset = M09_REGISTER_OFFSET;
+		reg_addr->reg_num_x = M09_REGISTER_NUM_X;
+		reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
+		break;
+	}
+}
+
+#ifdef CONFIG_OF
+static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
+				struct edt_ft5x06_ts_data *tsdata)
+{
+	struct device_node *np = dev->of_node;
+
+	/*
+	 * irq_pin is not needed for DT setup.
+	 * irq is associated via 'interrupts' property in DT
+	 */
+	tsdata->irq_pin = -EINVAL;
+	tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
+	tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
+
+	return 0;
+}
+#else
+static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
+					struct edt_ft5x06_ts_data *tsdata)
+{
+	return -ENODEV;
+}
+#endif
+
+static int edt_ft5x06_ts_probe(struct i2c_client *client,
+					 const struct i2c_device_id *id)
+{
+	const struct edt_ft5x06_platform_data *pdata =
+						dev_get_platdata(&client->dev);
+	struct edt_ft5x06_ts_data *tsdata;
+	struct input_dev *input;
+	int error;
+	char fw_version[EDT_NAME_LEN];
+
+	dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
+
+	tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
+	if (!tsdata) {
+		dev_err(&client->dev, "failed to allocate driver data.\n");
+		return -ENOMEM;
+	}
+
+	if (!pdata) {
+		error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
+		if (error) {
+			dev_err(&client->dev,
+				"DT probe failed and no platform data present\n");
+			return error;
+		}
+	} else {
+		tsdata->reset_pin = pdata->reset_pin;
+		tsdata->irq_pin = pdata->irq_pin;
+		tsdata->wake_pin = -EINVAL;
+	}
+
+	error = edt_ft5x06_ts_reset(client, tsdata);
+	if (error)
+		return error;
+
+	if (gpio_is_valid(tsdata->irq_pin)) {
+		error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
+					GPIOF_IN, "edt-ft5x06 irq");
+		if (error) {
+			dev_err(&client->dev,
+				"Failed to request GPIO %d, error %d\n",
+				tsdata->irq_pin, error);
+			return error;
+		}
+	}
+
+	input = devm_input_allocate_device(&client->dev);
+	if (!input) {
+		dev_err(&client->dev, "failed to allocate input device.\n");
+		return -ENOMEM;
+	}
+
+	mutex_init(&tsdata->mutex);
+	tsdata->client = client;
+	tsdata->input = input;
+	tsdata->factory_mode = false;
+
+	error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
+	if (error) {
+		dev_err(&client->dev, "touchscreen probe failed\n");
+		return error;
+	}
+
+	edt_ft5x06_ts_set_regs(tsdata);
+
+	if (!pdata)
+		edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
+	else
+		edt_ft5x06_ts_get_defaults(tsdata, pdata);
+
+	edt_ft5x06_ts_get_parameters(tsdata);
+
+	dev_dbg(&client->dev,
+		"Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
+		tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
+
+	input->name = tsdata->name;
+	input->id.bustype = BUS_I2C;
+	input->dev.parent = &client->dev;
+
+	__set_bit(EV_KEY, input->evbit);
+	__set_bit(EV_ABS, input->evbit);
+	__set_bit(BTN_TOUCH, input->keybit);
+	input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
+	input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
+	input_set_abs_params(input, ABS_MT_POSITION_X,
+			     0, tsdata->num_x * 64 - 1, 0, 0);
+	input_set_abs_params(input, ABS_MT_POSITION_Y,
+			     0, tsdata->num_y * 64 - 1, 0, 0);
+
+	if (!pdata)
+		touchscreen_parse_of_params(input);
+
+	error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
+	if (error) {
+		dev_err(&client->dev, "Unable to init MT slots.\n");
+		return error;
+	}
+
+	input_set_drvdata(input, tsdata);
+	i2c_set_clientdata(client, tsdata);
+
+	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+					edt_ft5x06_ts_isr,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					client->name, tsdata);
+	if (error) {
+		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+		return error;
+	}
+
+	error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+	if (error)
+		return error;
+
+	error = input_register_device(input);
+	if (error)
+		goto err_remove_attrs;
+
+	edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
+	device_init_wakeup(&client->dev, 1);
+
+	dev_dbg(&client->dev,
+		"EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
+		client->irq, tsdata->wake_pin, tsdata->reset_pin);
+
+	return 0;
+
+err_remove_attrs:
+	sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+	return error;
+}
+
+static int edt_ft5x06_ts_remove(struct i2c_client *client)
+{
+	struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+
+	edt_ft5x06_ts_teardown_debugfs(tsdata);
+	sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
+
+	return 0;
+}
+
+static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(client->irq);
+
+	return 0;
+}
+
+static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(client->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
+			 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
+
+static const struct i2c_device_id edt_ft5x06_ts_id[] = {
+	{ "edt-ft5x06", 0, },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id edt_ft5x06_of_match[] = {
+	{ .compatible = "edt,edt-ft5206", },
+	{ .compatible = "edt,edt-ft5306", },
+	{ .compatible = "edt,edt-ft5406", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
+#endif
+
+static struct i2c_driver edt_ft5x06_ts_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "edt_ft5x06",
+		.of_match_table = of_match_ptr(edt_ft5x06_of_match),
+		.pm = &edt_ft5x06_ts_pm_ops,
+	},
+	.id_table = edt_ft5x06_ts_id,
+	.probe    = edt_ft5x06_ts_probe,
+	.remove   = edt_ft5x06_ts_remove,
+};
+
+module_i2c_driver(edt_ft5x06_ts_driver);
+
+MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
+MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");