[PATCH] Touchscreen driver for FT5x06 based EDT displays

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From: Simon Budig <simon.budig@xxxxxxxxxxxxxxxxx>

This is a driver for the EDT "Polytouch" family of touch controllers
based on the FocalTech FT5x06 line of chips.

Signed-off-by: Simon Budig <simon.budig@xxxxxxxxxxxxxxxxx>
---
 drivers/input/touchscreen/Kconfig      |   13 +
 drivers/input/touchscreen/Makefile     |    1 +
 drivers/input/touchscreen/edt-ft5x06.c |  771 ++++++++++++++++++++++++++++++++
 include/linux/input/edt-ft5x06.h       |   17 +
 4 files changed, 802 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/edt-ft5x06.c
 create mode 100644 include/linux/input/edt-ft5x06.h

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 2a21419..0166a15 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -431,6 +431,19 @@ config TOUCHSCREEN_PENMOUNT
 	  To compile this driver as a module, choose M here: the
 	  module will be called penmount.
 
+config TOUCHSCREEN_EDT_FT5X06
+	tristate "EDT FocalTech FT5x06 I2C Touchscreen support"
+	depends on I2C
+	help
+	  Say Y here if you have an EDT "Polytouch" touchscreen based
+	  on the FocalTech FT5x06 family of controllers connected to
+	  your system.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called edt-ft5x06.
+
 config TOUCHSCREEN_MIGOR
 	tristate "Renesas MIGO-R touchscreen"
 	depends on SH_MIGOR && I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 3d5cf8c..8a68c84 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C)	+= cyttsp_i2c.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI)	+= cyttsp_spi.o
 obj-$(CONFIG_TOUCHSCREEN_DA9034)	+= da9034-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o
+obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06)	+= edt-ft5x06.o
 obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)	+= hampshire.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)		+= gunze.o
 obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
new file mode 100644
index 0000000..7c4f9f5
--- /dev/null
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -0,0 +1,771 @@
+/*
+ * Copyright (C) 2011 Simon Budig, <simon.budig@xxxxxxxxxxxxxxxxx>
+ *
+ * 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/interrupt.h>
+#include <linux/input.h>
+#include <linux/i2c.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include <linux/gpio.h>
+
+#include <linux/input/edt-ft5x06.h>
+
+#define DRIVER_VERSION "v0.5"
+
+#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 WORK_REGISTER_OPMODE      0x3c
+#define FACTORY_REGISTER_OPMODE   0x01
+
+struct edt_ft5x06_i2c_ts_data {
+	struct i2c_client *client;
+	struct input_dev *input;
+	int irq;
+	int irq_pin;
+	int reset_pin;
+	int num_x;
+	int num_y;
+
+	struct mutex mutex;
+	bool factory_mode;
+	int threshold;
+	int gain;
+	int offset;
+	int report_rate;
+};
+
+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, ret;
+
+	i = 0;
+	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) {
+		dev_err(&client->dev, "i2c_transfer failed: %d\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+
+static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_id;
+	unsigned char touching = 0;
+	unsigned char rdbuf[26], wrbuf[1];
+	int i, have_abs, type, ret;
+
+	memset(wrbuf, 0, sizeof(wrbuf));
+	memset(rdbuf, 0, sizeof(rdbuf));
+
+	wrbuf[0] = 0xf9;
+
+	mutex_lock(&tsdata->mutex);
+	ret = edt_ft5x06_ts_readwrite(tsdata->client,
+	                              1, wrbuf,
+	                              sizeof(rdbuf), rdbuf);
+	mutex_unlock(&tsdata->mutex);
+	if (ret < 0) {
+		dev_err(&tsdata->client->dev,
+		        "Unable to write to i2c touchscreen!\n");
+		goto out;
+	}
+
+	if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
+		dev_err(&tsdata->client->dev,
+		        "Unexpected header: %02x%02x%02x!\n",
+		        rdbuf[0], rdbuf[1], rdbuf[2]);
+	}
+
+	have_abs = 0;
+	touching = rdbuf[3];
+	for (i = 0; i < touching; i++) {
+		type = rdbuf[i*4+5] >> 6;
+		/* ignore Touch Down and Reserved events */
+		if (type == 0x01 || type == 0x03)
+			continue;
+
+		if (!have_abs) {
+			input_report_key(tsdata->input, BTN_TOUCH,    1);
+			input_report_abs(tsdata->input, ABS_PRESSURE, 1);
+			input_report_abs(tsdata->input, ABS_X,
+			                 ((rdbuf[i*4+5] << 8) |
+			                  rdbuf[i*4+6]) & 0x0fff);
+			input_report_abs(tsdata->input, ABS_Y,
+			                 ((rdbuf[i*4+7] << 8) |
+			                  rdbuf[i*4+8]) & 0x0fff);
+			have_abs = 1;
+		}
+		input_report_abs(tsdata->input, ABS_MT_POSITION_X,
+		                 ((rdbuf[i*4+5] << 8) | rdbuf[i*4+6]) & 0x0fff);
+		input_report_abs(tsdata->input, ABS_MT_POSITION_Y,
+		                 ((rdbuf[i*4+7] << 8) | rdbuf[i*4+8]) & 0x0fff);
+		input_report_abs(tsdata->input, ABS_MT_TRACKING_ID,
+		                 (rdbuf[i*4+7] >> 4) & 0x0f);
+		input_mt_sync(tsdata->input);
+	}
+	if (!have_abs) {
+		input_report_key(tsdata->input, BTN_TOUCH,    0);
+		input_report_abs(tsdata->input, ABS_PRESSURE, 0);
+	}
+	input_sync(tsdata->input);
+
+out:
+	return IRQ_HANDLED;
+}
+
+
+static int edt_ft5x06_i2c_register_write(struct edt_ft5x06_i2c_ts_data *tsdata,
+                                         u8 addr, u8 value)
+{
+	u8 wrbuf[4];
+	int ret;
+
+	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];
+
+	disable_irq(tsdata->irq);
+
+	ret = edt_ft5x06_ts_readwrite(tsdata->client,
+	                              4, wrbuf,
+	                              0, NULL);
+
+	enable_irq(tsdata->irq);
+
+	return ret;
+}
+
+static int edt_ft5x06_i2c_register_read(struct edt_ft5x06_i2c_ts_data *tsdata,
+                                        u8 addr)
+{
+	u8 wrbuf[2], rdbuf[2];
+	int ret;
+
+	wrbuf[0]  = tsdata->factory_mode ? 0xf3 : 0xfc;
+	wrbuf[1]  = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
+	wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
+
+	disable_irq(tsdata->irq);
+
+	ret = edt_ft5x06_ts_readwrite(tsdata->client,
+	                              2, wrbuf,
+	                              2, rdbuf);
+
+	enable_irq(tsdata->irq);
+
+	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 ret < 0 ? ret : rdbuf[0];
+}
+
+static ssize_t edt_ft5x06_i2c_setting_show(struct device *dev,
+                                           struct device_attribute *attr,
+                                           char *buf)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+	struct i2c_client *client = tsdata->client;
+	int ret = 0;
+	int *value;
+	u8 addr;
+
+	switch (attr->attr.name[0]) {
+	case 't':    /* threshold */
+		addr = WORK_REGISTER_THRESHOLD;
+		value = &tsdata->threshold;
+		break;
+	case 'g':    /* gain */
+		addr = WORK_REGISTER_GAIN;
+		value = &tsdata->gain;
+		break;
+	case 'o':    /* offset */
+		addr = WORK_REGISTER_OFFSET;
+		value = &tsdata->offset;
+		break;
+	case 'r':    /* report rate */
+		addr = WORK_REGISTER_REPORT_RATE;
+		value = &tsdata->report_rate;
+		break;
+	default:
+		dev_err(&client->dev,
+		        "unknown attribute for edt_ft5x06_i2c_setting_show: %s\n",
+		        attr->attr.name);
+		return -EINVAL;
+	}
+
+	mutex_lock(&tsdata->mutex);
+
+	if (tsdata->factory_mode) {
+		dev_err(dev,
+		        "setting register not available in factory mode\n");
+		mutex_unlock(&tsdata->mutex);
+		return -EIO;
+	}
+
+	ret = edt_ft5x06_i2c_register_read(tsdata, addr);
+	if (ret < 0) {
+		dev_err(&tsdata->client->dev,
+		        "Unable to write to i2c touchscreen!\n");
+		mutex_unlock(&tsdata->mutex);
+		return ret;
+	}
+	mutex_unlock(&tsdata->mutex);
+
+	if (ret != *value) {
+		dev_info(&tsdata->client->dev,
+		         "i2c read (%d) and stored value (%d) differ. Huh?\n",
+		         ret, *value);
+		*value = ret;
+	}
+
+	return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t edt_ft5x06_i2c_setting_store(struct device *dev,
+                                            struct device_attribute *attr,
+                                            const char *buf, size_t count)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+	struct i2c_client *client = tsdata->client;
+	int ret = 0;
+	u8 addr;
+	unsigned int val;
+
+	mutex_lock(&tsdata->mutex);
+
+	if (tsdata->factory_mode) {
+		dev_err(dev,
+		        "setting register not available in factory mode\n");
+		ret = -EIO;
+		goto out;
+	}
+
+	if (sscanf(buf, "%u", &val) != 1) {
+		dev_err(dev, "Invalid value for attribute %s\n",
+		        attr->attr.name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	switch (attr->attr.name[0]) {
+	case 't':    /* threshold */
+		addr = WORK_REGISTER_THRESHOLD;
+		val = val < 20 ? 20 : val > 80 ? 80 : val;
+		tsdata->threshold = val;
+		break;
+	case 'g':    /* gain */
+		addr = WORK_REGISTER_GAIN;
+		val = val < 0 ? 0 : val > 31 ? 31 : val;
+		tsdata->gain = val;
+		break;
+	case 'o':    /* offset */
+		addr = WORK_REGISTER_OFFSET;
+		val = val < 0 ? 0 : val > 31 ? 31 : val;
+		tsdata->offset = val;
+		break;
+	case 'r':    /* report rate */
+		addr = WORK_REGISTER_REPORT_RATE;
+		val = val < 3 ? 3 : val > 14 ? 14 : val;
+		tsdata->report_rate = val;
+		break;
+	default:
+		dev_err(&client->dev,
+		        "unknown attribute for edt_ft5x06_i2c_setting_show: %s\n",
+		        attr->attr.name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = edt_ft5x06_i2c_register_write(tsdata, addr, val);
+
+	if (ret < 0) {
+		dev_err(&tsdata->client->dev,
+		        "Unable to write to i2c touchscreen!\n");
+		goto out;
+	}
+
+out:
+	mutex_unlock(&tsdata->mutex);
+	return ret < 0 ? ret : count;
+}
+
+
+static ssize_t edt_ft5x06_i2c_mode_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+	return sprintf(buf, "%d\n", tsdata->factory_mode ? 1 : 0);
+}
+
+static ssize_t edt_ft5x06_i2c_mode_store(struct device *dev,
+                                         struct device_attribute *attr,
+                                         const char *buf, size_t count)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+	int i, ret = 0;
+	unsigned int mode;
+
+	if (sscanf(buf, "%u", &mode) != 1 || (mode | 1) != 1) {
+		dev_err(dev, "Invalid value for operation mode\n");
+		return -EINVAL;
+	}
+
+	/* no change, return without doing anything */
+	if (mode == tsdata->factory_mode)
+		return count;
+
+	mutex_lock(&tsdata->mutex);
+	if (!tsdata->factory_mode) { /* switch to factory mode */
+		disable_irq(tsdata->irq);
+		/* mode register is 0x3c when in the work mode */
+		ret = edt_ft5x06_i2c_register_write(tsdata,
+		                                    WORK_REGISTER_OPMODE, 0x03);
+		if (ret < 0) {
+			dev_err(dev, "failed to switch to factory mode (%d)\n",
+			        ret);
+		} else {
+			tsdata->factory_mode = 1;
+			for (i = 0; i < 10; i++) {
+				mdelay(5);
+				/* mode register is 0x01 when in factory mode */
+				ret = edt_ft5x06_i2c_register_read(tsdata, FACTORY_REGISTER_OPMODE);
+				if (ret == 0x03)
+					break;
+			}
+			if (i == 10)
+				dev_err(dev,
+				        "not in factory mode after %dms.\n",
+				        i*5);
+		}
+	} else {  /* switch to work mode */
+		/* mode register is 0x01 when in the factory mode */
+		ret = edt_ft5x06_i2c_register_write(tsdata,
+		                                    FACTORY_REGISTER_OPMODE,
+		                                    0x01);
+		if (ret < 0) {
+			dev_err(dev, "failed to switch to work mode (%d)\n",
+			        ret);
+		} else {
+			tsdata->factory_mode = 0;
+			for (i = 0; i < 10; i++) {
+				mdelay(5);
+				/* mode register is 0x01 when in factory mode */
+				ret = edt_ft5x06_i2c_register_read(tsdata, WORK_REGISTER_OPMODE);
+				if (ret == 0x01)
+					break;
+			}
+			if (i == 10)
+				dev_err(dev, "not in work mode after %dms.\n",
+				        i*5);
+
+			/* restore parameters */
+			edt_ft5x06_i2c_register_write(tsdata,
+			                              WORK_REGISTER_THRESHOLD,
+			                              tsdata->threshold);
+			edt_ft5x06_i2c_register_write(tsdata,
+			                              WORK_REGISTER_GAIN,
+			                              tsdata->gain);
+			edt_ft5x06_i2c_register_write(tsdata,
+			                              WORK_REGISTER_OFFSET,
+			                              tsdata->offset);
+			edt_ft5x06_i2c_register_write(tsdata,
+			                              WORK_REGISTER_REPORT_RATE,
+			                              tsdata->report_rate);
+
+			enable_irq(tsdata->irq);
+		}
+	}
+
+	mutex_unlock(&tsdata->mutex);
+	return count;
+}
+
+
+static ssize_t edt_ft5x06_i2c_raw_data_show(struct device *dev,
+                                            struct device_attribute *attr,
+                                            char *buf)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+	int i, ret;
+	char *ptr, wrbuf[3];
+
+	if (!tsdata->factory_mode) {
+		dev_err(dev, "raw data not available in work mode\n");
+		return -EIO;
+	}
+
+	mutex_lock(&tsdata->mutex);
+	ret = edt_ft5x06_i2c_register_write(tsdata, 0x08, 0x01);
+	for (i = 0; i < 100; i++) {
+		ret = edt_ft5x06_i2c_register_read(tsdata, 0x08);
+		if (ret < 1)
+			break;
+		udelay(1000);
+	}
+
+	if (i == 100 || ret < 0) {
+		dev_err(dev, "waiting time exceeded or error: %d\n", ret);
+		mutex_unlock(&tsdata->mutex);
+		return ret < 0 ? ret : -ETIMEDOUT;
+	}
+
+	ptr = buf;
+	wrbuf[0] = 0xf5;
+	wrbuf[1] = 0x0e;
+	for (i = 0; i <= tsdata->num_x; i++) {
+		wrbuf[2] = i;
+		ret = edt_ft5x06_ts_readwrite(tsdata->client,
+		                               3, wrbuf,
+		                               tsdata->num_y * 2, ptr);
+		if (ret < 0) {
+			mutex_unlock(&tsdata->mutex);
+			return ret;
+		}
+
+		ptr += tsdata->num_y * 2;
+	}
+
+	mutex_unlock(&tsdata->mutex);
+	return ptr - buf;
+}
+
+
+static DEVICE_ATTR(gain,      0664,
+                   edt_ft5x06_i2c_setting_show, edt_ft5x06_i2c_setting_store);
+static DEVICE_ATTR(offset,    0664,
+                   edt_ft5x06_i2c_setting_show, edt_ft5x06_i2c_setting_store);
+static DEVICE_ATTR(threshold, 0664,
+                   edt_ft5x06_i2c_setting_show, edt_ft5x06_i2c_setting_store);
+static DEVICE_ATTR(report_rate, 0664,
+                   edt_ft5x06_i2c_setting_show, edt_ft5x06_i2c_setting_store);
+static DEVICE_ATTR(mode,      0664,
+                   edt_ft5x06_i2c_mode_show, edt_ft5x06_i2c_mode_store);
+static DEVICE_ATTR(raw_data,  0444,
+                   edt_ft5x06_i2c_raw_data_show, NULL);
+
+static struct attribute *edt_ft5x06_i2c_attrs[] = {
+	&dev_attr_gain.attr,
+	&dev_attr_offset.attr,
+	&dev_attr_threshold.attr,
+	&dev_attr_report_rate.attr,
+	&dev_attr_mode.attr,
+	&dev_attr_raw_data.attr,
+	NULL
+};
+
+static const struct attribute_group edt_ft5x06_i2c_attr_group = {
+	.attrs = edt_ft5x06_i2c_attrs,
+};
+
+static int edt_ft5x06_i2c_ts_probe(struct i2c_client *client,
+                                   const struct i2c_device_id *id)
+{
+
+	struct edt_ft5x06_i2c_ts_data *tsdata;
+	struct edt_ft5x06_platform_data *pdata;
+	struct input_dev *input;
+	int error;
+	u8 rdbuf[23];
+	char *model_name, *fw_version;
+
+	dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
+
+	if (!client->dev.platform_data) {
+		dev_err(&client->dev, "no platform data?\n");
+		return -ENODEV;
+	}
+
+	tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
+	if (!tsdata) {
+		dev_err(&client->dev, "failed to allocate driver data!\n");
+		dev_set_drvdata(&client->dev, NULL);
+		return -ENOMEM;
+	}
+
+	dev_set_drvdata(&client->dev, tsdata);
+	tsdata->client = client;
+	pdata = client->dev.platform_data;
+
+	tsdata->reset_pin = pdata->reset_pin;
+	mutex_init(&tsdata->mutex);
+
+	if (tsdata->reset_pin >= 0) {
+		error = gpio_request(tsdata->reset_pin, "edt-ft5x06 reset");
+		if (error < 0) {
+			dev_err(&client->dev,
+			        "Failed to request GPIO %d as reset pin, error %d\n",
+			         tsdata->reset_pin, error);
+			goto err_free_tsdata;
+		}
+
+		/* this pulls reset down, enabling the low active reset */
+		if (gpio_direction_output(tsdata->reset_pin, 0) < 0) {
+			dev_info(&client->dev, "switching to output failed\n");
+			goto err_free_reset_pin;
+		}
+	}
+
+	/* request IRQ pin */
+	tsdata->irq_pin = pdata->irq_pin;
+	tsdata->irq = gpio_to_irq(tsdata->irq_pin);
+
+	error = gpio_request(tsdata->irq_pin, "edt-ft5x06 irq");
+	if (error < 0) {
+		dev_err(&client->dev,
+		        "Failed to request GPIO %d for IRQ %d, error %d\n",
+		        tsdata->irq_pin, tsdata->irq, error);
+		goto err_free_reset_pin;
+	}
+	gpio_direction_input(tsdata->irq_pin);
+
+	if (tsdata->reset_pin >= 0) {
+		/* release reset */
+		mdelay(50);
+		gpio_set_value(tsdata->reset_pin, 1);
+		mdelay(100);
+	}
+
+	mutex_lock(&tsdata->mutex);
+
+	tsdata->factory_mode = 0;
+
+	if (edt_ft5x06_ts_readwrite(client, 1, "\xbb", 22, rdbuf) < 0) {
+		dev_err(&client->dev, "probing failed\n");
+		error = -ENODEV;
+		goto err_free_irq_pin;
+	}
+
+	tsdata->threshold = edt_ft5x06_i2c_register_read(tsdata,
+	                                                 WORK_REGISTER_THRESHOLD);
+	tsdata->gain      = edt_ft5x06_i2c_register_read(tsdata,
+	                                                 WORK_REGISTER_GAIN);
+	tsdata->offset    = edt_ft5x06_i2c_register_read(tsdata,
+	                                                 WORK_REGISTER_OFFSET);
+	tsdata->report_rate = edt_ft5x06_i2c_register_read(tsdata,
+	                                                 WORK_REGISTER_REPORT_RATE);
+	tsdata->num_x     = edt_ft5x06_i2c_register_read(tsdata,
+	                                                 WORK_REGISTER_NUM_X);
+	tsdata->num_y     = edt_ft5x06_i2c_register_read(tsdata,
+	                                                 WORK_REGISTER_NUM_Y);
+
+	mutex_unlock(&tsdata->mutex);
+
+	/* remove last '$' end marker */
+	rdbuf[22] = '\0';
+	if (rdbuf[21] == '$')
+		rdbuf[21] = '\0';
+
+	model_name = rdbuf + 1;
+	/* look for Model/Version separator */
+	fw_version = strchr(rdbuf, '*');
+
+	if (fw_version) {
+		fw_version[0] = '\0';
+		fw_version++;
+		dev_info(&client->dev,
+		         "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
+		         model_name, fw_version, tsdata->num_x, tsdata->num_y);
+	} else {
+		dev_info(&client->dev, "Product ID \"%s\"\n", model_name);
+	}
+
+	input = input_allocate_device();
+	if (!input) {
+		dev_err(&client->dev, "failed to allocate input device!\n");
+		error = -ENOMEM;
+		goto err_free_irq_pin;
+	}
+
+	__set_bit(EV_SYN, input->evbit);
+	__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_PRESSURE, 0, 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);
+	input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 15, 0, 0);
+
+	input->name = kstrdup(model_name, GFP_NOIO);
+	input->id.bustype = BUS_I2C;
+	input->dev.parent = &client->dev;
+
+	input_set_drvdata(input, tsdata);
+
+	tsdata->input = input;
+
+	error = input_register_device(input);
+	if (error)
+		goto err_free_input_device;
+
+	if (request_threaded_irq(tsdata->irq, NULL, edt_ft5x06_ts_isr,
+	                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+	                         client->name, tsdata)) {
+		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+		input = NULL;
+		error = -ENOMEM;
+		goto err_unregister_device;
+	}
+
+	error = sysfs_create_group(&client->dev.kobj,
+	                           &edt_ft5x06_i2c_attr_group);
+	if (error)
+		goto err_free_irq;
+
+	device_init_wakeup(&client->dev, 1);
+
+	dev_dbg(&tsdata->client->dev,
+	        "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
+	        tsdata->irq_pin, tsdata->reset_pin);
+
+	return 0;
+
+err_free_irq:
+	free_irq(tsdata->irq, tsdata);
+err_unregister_device:
+	input_unregister_device(input);
+	input = NULL;
+err_free_input_device:
+	if (input) {
+		kfree(input->name);
+		input_free_device(input);
+	}
+err_free_irq_pin:
+	gpio_free(tsdata->irq_pin);
+err_free_reset_pin:
+	if (tsdata->reset_pin >= 0)
+		gpio_free(tsdata->reset_pin);
+err_free_tsdata:
+	kfree(tsdata);
+	return error;
+}
+
+static int edt_ft5x06_i2c_ts_remove(struct i2c_client *client)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(&client->dev);
+
+	sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_i2c_attr_group);
+
+	free_irq(tsdata->irq, tsdata);
+	kfree(tsdata->input->name);
+	input_unregister_device(tsdata->input);
+	gpio_free(tsdata->irq_pin);
+	if (tsdata->reset_pin >= 0)
+		gpio_free(tsdata->reset_pin);
+	kfree(tsdata);
+
+	return 0;
+}
+
+static int edt_ft5x06_i2c_ts_suspend(struct device *dev)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(tsdata->irq);
+
+	return 0;
+}
+
+static int edt_ft5x06_i2c_ts_resume(struct device *dev)
+{
+	struct edt_ft5x06_i2c_ts_data *tsdata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(tsdata->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(edt_ft5x06_i2c_ts_pm_ops,
+                         edt_ft5x06_i2c_ts_suspend, edt_ft5x06_i2c_ts_resume);
+
+static const struct i2c_device_id edt_ft5x06_i2c_ts_id[] = {
+	{ "edt-ft5x06", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, edt_ft5x06_i2c_ts_id);
+
+static struct i2c_driver edt_ft5x06_i2c_ts_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "edt_ft5x06_i2c",
+		.pm = &edt_ft5x06_i2c_ts_pm_ops,
+	},
+	.id_table = edt_ft5x06_i2c_ts_id,
+	.probe    = edt_ft5x06_i2c_ts_probe,
+	.remove   = edt_ft5x06_i2c_ts_remove,
+};
+
+static int __init edt_ft5x06_i2c_ts_init(void)
+{
+	return i2c_add_driver(&edt_ft5x06_i2c_ts_driver);
+}
+module_init(edt_ft5x06_i2c_ts_init);
+
+static void __exit edt_ft5x06_i2c_ts_exit(void)
+{
+	i2c_del_driver(&edt_ft5x06_i2c_ts_driver);
+}
+module_exit(edt_ft5x06_i2c_ts_exit);
+
+MODULE_AUTHOR("Simon Budig <simon.budig@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/input/edt-ft5x06.h b/include/linux/input/edt-ft5x06.h
new file mode 100644
index 0000000..db4130d
--- /dev/null
+++ b/include/linux/input/edt-ft5x06.h
@@ -0,0 +1,17 @@
+#ifndef _EDT_FT5X06_H
+#define _EDT_FT5X06_H
+
+/*
+ * Copyright (c) 2011 Simon Budig, <simon.budig@xxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+struct edt_ft5x06_platform_data {
+	int irq_pin;
+	int reset_pin;
+};
+
+#endif /* _EDT_FT5X06_H */
-- 
1.7.2.5

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