Re: [PATCH v2 1/1] Input: STMicroelectronics multi touch capacitive touchscreen ftk

+STM FTK TOUCHSCREEN DRIVER
+M:      Li Wu <li.wu@st.com>
+L:      device-drivers-devel@blackfin.uclinux.org
+W:      http://www.st.com
+S:      Supported
+F:      drivers/input/touchscreen/ftk.c
+
+

 ADDRESS SPACE LAYOUT RANDOMIZATION (ASLR)
 M:	Jiri Kosina [off-list ref]
 S:	Maintained

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index f7668b2..c81e2e7 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig

@@ -900,4 +900,15 @@ config TOUCHSCREEN_TPS6507X
 	  To compile this driver as a module, choose M here: the
 	  module will be called tps6507x_ts.
 
+config TOUCHSCREEN_FTK
+        tristate "STMicroelectronics i2c multitouch touchscreen with FingerTipK"
+        depends on I2C
+        help
+          Say Y here to enable STMicroelectronics touchscreen support.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called STM_ts.

+
 endif

diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 178eb12..6feba9b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile

@@ -73,3 +73,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE)	+= mainstone-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o
 obj-$(CONFIG_TOUCHSCREEN_TPS6507X)	+= tps6507x-ts.o
+obj-$(CONFIG_TOUCHSCREEN_FTK)           += ftk.o

diff --git a/drivers/input/touchscreen/ftk.c b/drivers/input/touchscreen/ftk.c
new file mode 100644
index 0000000..fa98409
--- /dev/null
+++ b/drivers/input/touchscreen/ftk.c

@@ -0,0 +1,638 @@
+/*
+ * drivers/input/touchscreen/ftk.c

+ *
+ * Driver for STMicroelectronics FTK capacity touchscreen
+ *
+ * Author: JH Jang <jh.jang@st.com>
+ *         Victor Phay <victor.phay@st.com>
+ *         Li Wu <li.wu@st.com>, <willy.woo@gmail.com>
+ *
+ * Copyright (c) 2012 STMicroelectronics Limited
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *

+ */
+
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/firmware.h>
+#include <linux/fs.h>
+#include <linux/gpio.h>
+#include <linux/hrtimer.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/serio.h>

+
+/*
+ * Definitions & global arrays.
+ */
+#define DRIVER_DESC                   "ftk i2c touchscreen driver"

+#define FTK_TS_DRV_NAME               "ftk"
+#define X_AXIS_MAX                    800
+#define X_AXIS_MIN                    0
+#define Y_AXIS_MAX                    480
+#define Y_AXIS_MIN                    0
+#define PRESSURE_MIN                  0
+#define PRESSURE_MAX                  256
+#define P70_PATCH_ADDR_START          0x00420000
+#define LEAVE_EVENT                   0x04
+#define ENTER_EVENT                   0x03
+#define MOTION_EVENT                  0x05
+#define RESET_EVENT                   0x10
+#define MAX_SUPPORTED_FINGERS         10
+#define MAX_TRANSACTION_LENGTH        8
+#define NUM_DIM                       3
+
+#define FTK_SOFT_RESET                0x9E
+#define FTK_TSSON                     0x83
+#define FTK_READ_OLDESE_EVENT         0x85
+#define FTK_BASE_ADDR                 0xB0
+#define FTK_TYPE_B1                   0xB1
+#define FTK_TYPE_B3                   0xB3
+
+
+static struct i2c_driver stm_ts_driver;
+static struct workqueue_struct *stmtouch_wq;
+static int cor_xyz[MAX_SUPPORTED_FINGERS][NUM_DIM];
+static unsigned char id_indx[MAX_SUPPORTED_FINGERS];
+struct ftk_i2c_platform_data {
+	int (*power)(int on);
+};

+
+struct ftk_ts {
+	struct device *dev;
+	struct i2c_client *client;
+	struct input_dev *input_dev;
+	struct hrtimer timer;
+	struct work_struct work;

+	spinlock_t lock;
+	int x;
+	int y;
+	int z;
+	int irq;
+	int (*power)(int on);
+};
+
+static int ftk_write_reg(struct ftk_ts *ftk_ts, u8 *reg, u16 num_com)
+{
+	struct i2c_msg xfer_msg[2];
+
+	xfer_msg[0].addr = ftk_ts->client->addr;
+	xfer_msg[0].len = num_com;
+	xfer_msg[0].flags = 0;
+	xfer_msg[0].buf = reg;
+
+	return i2c_transfer(ftk_ts->client->adapter, xfer_msg, 1);
+}
+
+static int ftk_read_reg(struct ftk_ts *ftk_ts, u8 *reg, int cnum, u8 *buf,
+			int num)
+{
+	u16 left = num;
+	u16 offset = 0;
+
+	struct i2c_msg xfer_msg[2];
+
+	xfer_msg[0].addr = ftk_ts->client->addr;
+	xfer_msg[0].len = cnum;
+	xfer_msg[0].flags = 0;
+	xfer_msg[0].buf = reg;
+
+	xfer_msg[1].addr = ftk_ts->client->addr;
+	xfer_msg[1].flags = I2C_M_RD;
+
+	/* MTK platform */
+	/* Can only transfer 8 bytes per transaction */
+	while (left > 0) {
+		xfer_msg[1].buf = &buf[offset];
+
+		if (left > MAX_TRANSACTION_LENGTH) {
+			xfer_msg[1].len = MAX_TRANSACTION_LENGTH;
+			left -= MAX_TRANSACTION_LENGTH;
+			offset += MAX_TRANSACTION_LENGTH;
+		} else {
+			xfer_msg[1].len = left;
+			left = 0;
+		}
+
+		if (i2c_transfer(ftk_ts->client->adapter, xfer_msg, 2) != 2) {
+			dev_err(ftk_ts->dev, "FTK - i2c Transfer error!\n");
+			return 1;

+		}
+	}
+
+	return 0;
+}
+
+static void touch_on(struct ftk_ts *ftkts, int x, int y, int z, int id)
+{
+	input_report_key(ftkts->input_dev, BTN_TOUCH, 1);
+	input_report_abs(ftkts->input_dev, ABS_MT_POSITION_X, x);
+	input_report_abs(ftkts->input_dev, ABS_MT_POSITION_Y, y);
+	input_report_abs(ftkts->input_dev, ABS_MT_TOUCH_MAJOR, z);
+	input_report_abs(ftkts->input_dev, ABS_MT_TRACKING_ID, id);
+	input_mt_sync(ftkts->input_dev);
+}
+
+static void touch_off(struct ftk_ts *ftkts)
+{
+	input_report_key(ftkts->input_dev, BTN_TOUCH, 0);
+	input_report_abs(ftkts->input_dev, ABS_MT_TRACKING_ID, 0);
+	input_mt_sync(ftkts->input_dev);
+}
+
+static u8 load_config(struct ftk_ts *ftk_ts, const struct firmware *firmware)
+{
+	u16 one_group_length = 0;
+	u16 patch_length = 0;
+	u16 config_length = 0;
+	u16 i = 0;
+	u8 *pdata;
+	u8 reg_add[8];
+	u8 val[8];
+	int ret;
+
+	patch_length = firmware->data[0] * 256 + firmware->data[1];

+	config_length =
+		firmware->data[patch_length + 2] * 256 +
+		firmware->data[patch_length + 2 + 1];

+	pdata = (u8 *)&firmware->data[patch_length + 4];
+
+	while (i < config_length) {
+		one_group_length = pdata[i] * 256 + pdata[i + 1];

+
+		if ((pdata[i + 2] == 0xFF) && (pdata[i + 3] == 0xFF))
+			mdelay(pdata[i + 4]);
+		else{
+			ftk_write_reg(ftk_ts, &(pdata[i + 2]),
+				      one_group_length);
+			mdelay(100);
+		}
+
+		i = i + 2;
+		i = i + one_group_length;
+	}
+
+	reg_add[0] = FTK_BASE_ADDR;
+	reg_add[1] = 0x05;       /* Set Interrupt Polarity */
+	reg_add[2] = 0x00;       /* '00' - level interrupt */
+	ftk_write_reg(ftk_ts, &reg_add[0], 3);
+	mdelay(5);
+
+	reg_add[0] = FTK_BASE_ADDR;
+	reg_add[1] = 0x06;       /* Enable Touch Detect Interrupt */
+	reg_add[2] = 0x40;       /* 0xC0 */
+	ftk_write_reg(ftk_ts, &reg_add[0], 3);
+	mdelay(5);
+
+	reg_add[0] = FTK_BASE_ADDR;
+	reg_add[1] = 0x07;       /* Read 0x07 to clear ISR */
+	ret = ftk_read_reg(ftk_ts, &reg_add[0], 2, &val[0], 1);
+	mdelay(5);
+
+	reg_add[0] = FTK_READ_OLDESE_EVENT;
+	ret = ftk_read_reg(ftk_ts, &reg_add[0], 1, &val[0], 8);
+	mdelay(20);
+
+	reg_add[0] = FTK_READ_OLDESE_EVENT;
+	ret = ftk_read_reg(ftk_ts, &reg_add[0], 1, &val[0], 8);
+	mdelay(20);
+
+	reg_add[0] = FTK_BASE_ADDR;
+	reg_add[1] = 0x03;
+	ret = ftk_read_reg(ftk_ts, reg_add, 2, val, 1);
+	mdelay(5);
+	dev_info(ftk_ts->dev, "Patch loaded, Version =%X\n", val[0]);
+
+	reg_add[0] = FTK_TSSON;       /* TS Sense on */
+	reg_add[1] = 0x00;
+	ret = ftk_write_reg(ftk_ts, &reg_add[0], 1);
+	mdelay(5);
+	return ret;
+}
+
+static u8 load_patch(struct ftk_ts *ftk_ts, const struct firmware *firmware)
+{
+	u32 write_addr, j = 0, i = 0;
+	u16 patch_length = 0;
+	u8 byte_work[256 + 3] = { 0 };
+	u8 reg_add[3] = { 0 };
+
+	patch_length = firmware->data[0] * 256 + firmware->data[1];
+
+	while (j < patch_length) {
+		write_addr = P70_PATCH_ADDR_START + j;
+
+		reg_add[0] = FTK_TYPE_B3;
+		reg_add[1] = (write_addr >> 24) & 0xFF;
+		reg_add[2] = (write_addr >> 16) & 0xFF;
+		ftk_write_reg(ftk_ts, &reg_add[0], 3);
+
+		byte_work[0] = FTK_TYPE_B1;
+		byte_work[1] = (write_addr >> 8) & 0xFF;
+		byte_work[2] = write_addr & 0xFF;
+
+		i = 0;
+		while ((j < firmware->size) && (i < 256)) {
+			byte_work[i + 3] = firmware->data[j + 2];
+			i++;
+			j++;
+		}
+		ftk_write_reg(ftk_ts, &byte_work[0], 256 + 3);
+	}
+
+	return 0;
+}
+
+static int verify_firmware(const struct firmware *firmware)
+{
+	u16 firmware_length;
+	u16 patch_length;
+	u16 config_length;
+
+	firmware_length = firmware->size;
+	patch_length = firmware->data[0] * 256 + firmware->data[1];
+	config_length =
+		firmware->data[patch_length + 2] * 256 +
+		firmware->data[patch_length + 2 + 1];
+
+	if (firmware_length == patch_length + config_length + 4)
+		return 0;
+	else
+		return -1;
+}
+
+static int init_ftk(struct ftk_ts *ftk_ts)
+{
+	const struct firmware *firmware;
+	u8 reg_add[7];
+	u8 val[8];
+	int ret;
+
+	reg_add[0] = FTK_BASE_ADDR;
+	reg_add[1] = 0x00;
+	ret = ftk_read_reg(ftk_ts, reg_add, 2, val, 3);
+
+	if (ret < 0)
+		dev_err(ftk_ts->dev, "i2c_transfer failed\n");
+
+	mdelay(1);
+	dev_dbg(ftk_ts->dev, "Chip ID = %x %x %x\n", val[0], val[1], val[2]);
+
+	reg_add[0] = FTK_SOFT_RESET; /* TS Soft Reset */
+	ret = ftk_write_reg(ftk_ts, &reg_add[0], 1);
+	mdelay(1);
+
+	ret = request_firmware(&firmware, "ftk/ftk.bin", ftk_ts->dev);
+	if (ret < 0) {
+		dev_err(ftk_ts->dev, "request fw fail ,err = %d\n", ret);
+		return ret;
+	}
+
+	ret = verify_firmware(firmware);
+	if (ret == 0) {
+		load_patch(ftk_ts, firmware);
+		load_config(ftk_ts, firmware);
+
+	}
+
+	release_firmware(firmware);
+
+	reg_add[0] = FTK_TYPE_B3;
+	reg_add[1] = 0xFF;
+	reg_add[2] = 0xFF;
+	ftk_write_reg(ftk_ts, &reg_add[0], 3);
+
+	/*wait till this operation ends, to be safe */
+	mdelay(5);
+
+	reg_add[0] = 0xA0;
+	ftk_write_reg(ftk_ts, &reg_add[0], 1);
+	mdelay(5);
+
+	if (ret < 0)
+		dev_err(ftk_ts->dev, "ftk Not Initialised\n");
+	else
+		dev_info(ftk_ts->dev, "ftk Initialised\n");
+
+	return 0;
+}
+
+static enum hrtimer_restart st_ts_timer_func(struct hrtimer *timer)
+{
+	struct ftk_ts *ftkts = container_of(timer, struct ftk_ts, timer);
+
+	queue_work(stmtouch_wq, &ftkts->work);
+	return HRTIMER_NORESTART;
+}
+
+static irqreturn_t ts_interrupt(int irq, void *handle)
+{
+	struct ftk_ts *ftk_ts = handle;
+
+	disable_irq_nosync(ftk_ts->client->irq);
+	queue_work(stmtouch_wq, &ftk_ts->work);
+	return IRQ_HANDLED;

+}
+
+static u8 decode_data_packet(struct ftk_ts *ftkts, unsigned char data[],
+			     unsigned char left_event)
+{
+	u8 event_num;
+	u8 touch_id, event_id;
+	u8 last_left_event = 0;
+	u8 i, num_released_finger;
+	u8 valid_id = 0;
+
+	for (event_num = 0; event_num < left_event; event_num++) {
+		last_left_event = data[7 + event_num * 8] & 0x0F;
+		touch_id = data[1 + event_num * 8] & 0x0F;
+		event_id = data[event_num * 8] & 0xFF;
+
+		if ((event_id == LEAVE_EVENT) || (event_id == ENTER_EVENT) ||
+		    (event_id == MOTION_EVENT)) {
+			/* Enter, Leave or Motion Event */
+			if (touch_id < MAX_SUPPORTED_FINGERS) {
+				valid_id = 1;
+
+				id_indx[touch_id] = event_id;
+				cor_xyz[touch_id][0] =
+					((data[4 + event_num *
+					       8] &
+					  0xF0) >>
+					 4) | ((data[2 + event_num * 8]) << 4);
+				cor_xyz[touch_id][1] =
+					((data[4 + event_num *
+					       8] &
+					  0x0F) |
+					 ((data[3 + event_num * 8]) << 4));
+				cor_xyz[touch_id][2] = data[5 + event_num * 8];
+			}
+		} else if (event_id == RESET_EVENT) {
+			/* Reset happened */
+			for (i = 0; i < MAX_SUPPORTED_FINGERS; i++)
+				id_indx[i] = 0;
+
+			touch_off(ftkts);
+
+			input_sync(ftkts->input_dev);
+			init_ftk(ftkts);
+			return 0;
+		}
+	}
+
+	if (valid_id) {
+		/* Report all fingers on panel */
+		num_released_finger = 0;
+		for (i = 0; i < MAX_SUPPORTED_FINGERS; i++) {
+			if (id_indx[i]) {
+				if (id_indx[i] == LEAVE_EVENT) {
+					id_indx[i] = 0;
+					num_released_finger++;
+				}
+
+				touch_on(ftkts, cor_xyz[i][0], cor_xyz[i][1],
+					 cor_xyz[i][2],
+					 i);
+			} else
+				num_released_finger++;
+		}
+
+		input_sync(ftkts->input_dev);
+
+		/* Check if all fingers are released */
+		if (num_released_finger == MAX_SUPPORTED_FINGERS) {
+			/* All fingers are released */
+			touch_off(ftkts);
+			input_sync(ftkts->input_dev);
+		}
+	}
+
+	return last_left_event;
+}
+
+static void ts_tasklet_proc(struct work_struct *work)
+{
+	struct ftk_ts *ftkts = container_of(work, struct ftk_ts, work);
+
+	unsigned char data[256];
+	int ret;
+	u8 status;
+	u8 reg_add;
+	u8 i;
+	u8 first_left_event = 0;
+
+	data[0] = FTK_BASE_ADDR;
+	data[1] = 0x07;
+	ret = ftk_read_reg(ftkts, &data[0], 2, &status, 1);
+
+	if (status & 0x40) {
+		reg_add = FTK_READ_OLDESE_EVENT;
+		if (ftk_read_reg(ftkts, &reg_add, 1, data, 8) == 0) {
+			first_left_event = decode_data_packet(ftkts, data, 1);
+
+			/* Read and process 1 event (8bytes) at a time */
+			for (i = 0; i < first_left_event; i++) {
+				reg_add = FTK_READ_OLDESE_EVENT;
+				if (ftk_read_reg(ftkts, &reg_add, 1, data,
+						 8) == 0)
+					first_left_event = decode_data_packet(
+						ftkts, data, 1);
+			}
+		}
+	}
+
+	if (!ftkts->irq)
+		hrtimer_start(&ftkts->timer, ktime_set(0, 10000000),
+			      HRTIMER_MODE_REL);
+	else
+		enable_irq(ftkts->client->irq);
+}
+
+static int stm_ts_probe(struct i2c_client *client,
+			const struct i2c_device_id *idp)
+{
+	struct ftk_ts *ftk_ts = NULL;
+	struct ftk_i2c_platform_data *pdata;
+	int ret = 0;
+	int err = 0;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(ftk_ts->dev, "err = EIO!\n");
+		err = EIO;

+		goto fail;
+	}
+
+	ftk_ts = kzalloc(sizeof(struct ftk_ts), GFP_KERNEL);
+	if (!ftk_ts) {
+		dev_err(ftk_ts->dev, "err = ENOMEM!\n");
+		err = ENOMEM;
+		goto fail;
+	}
+
+	INIT_WORK(&ftk_ts->work, ts_tasklet_proc);
+
+	ftk_ts->client = client;
+	i2c_set_clientdata(client, ftk_ts);
+
+	pdata = client->dev.platform_data;
+
+	if (pdata)
+		ftk_ts->power = pdata->power;
+
+	if (ftk_ts->power) {
+		ret = ftk_ts->power(1);
+
+		pdata->power(1);
+
+		if (ret < 0) {
+			pr_err("ftk_probe power on failed\n");
+			goto fail;
+		}
+	}
+
+	ftk_ts->dev = &ftk_ts->client->dev;
+	ftk_ts->input_dev = input_allocate_device();
+	if (!ftk_ts->input_dev) {
+		dev_err(ftk_ts->dev, "err = ENOMEM!\n");
+		err = ENOMEM;
+		goto fail;
+	}
+	ftk_ts->input_dev->dev.parent = &client->dev;
+	ftk_ts->input_dev->name = "ftk";
+	ftk_ts->input_dev->phys = "ftk/input0";
+	ftk_ts->input_dev->id.bustype = BUS_I2C;
+	ftk_ts->input_dev->id.vendor = 0x0001;
+	ftk_ts->input_dev->id.product = 0x0002;
+	ftk_ts->input_dev->id.version = 0x0100;
+
+	ftk_ts->input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+	ftk_ts->input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+	set_bit(EV_SYN, ftk_ts->input_dev->evbit);

+	set_bit(EV_KEY, ftk_ts->input_dev->evbit);
+	set_bit(BTN_TOUCH, ftk_ts->input_dev->keybit);
+	set_bit(BTN_2, ftk_ts->input_dev->keybit);

+
+	input_set_abs_params(ftk_ts->input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX,
+			     0, 0);
+	input_set_abs_params(ftk_ts->input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX,
+			     0, 0);
+	input_set_abs_params(ftk_ts->input_dev, ABS_PRESSURE, PRESSURE_MIN,
+			     PRESSURE_MAX, 0, 0);
+	input_set_abs_params(ftk_ts->input_dev, ABS_MT_TRACKING_ID, 0, 10, 0,
+			     0);
+	input_set_abs_params(ftk_ts->input_dev, ABS_MT_TOUCH_MAJOR,
+			     PRESSURE_MIN, PRESSURE_MAX, 0, 0);
+	input_set_abs_params(ftk_ts->input_dev, ABS_MT_WIDTH_MAJOR,
+			     PRESSURE_MIN, PRESSURE_MAX, 0, 0);

+	input_set_abs_params(ftk_ts->input_dev, ABS_MT_POSITION_X, X_AXIS_MIN,
+			     X_AXIS_MAX, 0, 0);
+	input_set_abs_params(ftk_ts->input_dev, ABS_MT_POSITION_Y, Y_AXIS_MIN,
+			     Y_AXIS_MAX, 0, 0);
+
+	err = input_register_device(ftk_ts->input_dev);
+	if (err) {
+		dev_err(ftk_ts->dev, "input_register_device fail!\n");
+		goto fail;
+	}
+
+	err = init_ftk(ftk_ts);
+	if (err) {
+		dev_err(ftk_ts->dev, "init_ftk  fail!\n");
+		goto fail;
+	}
+
+	ftk_ts->irq = client->irq;
+
+	if (!ftk_ts->irq) {
+		hrtimer_init(&ftk_ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+		ftk_ts->timer.function = st_ts_timer_func;
+		hrtimer_start(&ftk_ts->timer, ktime_set(1, 0),
+			      HRTIMER_MODE_REL);
+	} else {
+		ret = devm_request_threaded_irq(ftk_ts->dev, ftk_ts->irq,
+						NULL, ts_interrupt,
+						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+						client->name,
+						ftk_ts);

+		if (ret) {
+			dev_err(ftk_ts->dev, "request_irq  fail!\n");
+			err = -EBUSY;
+			goto fail;
+		}
+	}
+
+	return 0;
+fail:
+	if (ftk_ts) {
+		if (ftk_ts->input_dev)
+			input_free_device(ftk_ts->input_dev);
+		kfree(ftk_ts);
+	}
+	dev_info(ftk_ts->dev, "--ftkts_probe ret=%d\n", err);
+	return err;
+}
+
+static int stm_ts_remove(struct i2c_client *client)
+{
+	struct ftk_ts *ts = i2c_get_clientdata(client);
+
+	if (ts->irq)
+		devm_free_irq(ts->dev, client->irq, ts);
+	else
+		hrtimer_cancel(&ts->timer);
+
+	input_unregister_device(ts->input_dev);
+	kfree(ts);
+	return 0;
+}
+
+static const struct i2c_device_id stm_ts_id[] = {
+	{ "ftk", 0 },
+	{}
+};
+
+static struct i2c_driver stm_ts_driver = {
+	.driver		= {
+		.name	= "ftk",
+	},
+	.probe		= stm_ts_probe,
+	.remove		= stm_ts_remove,
+	.id_table	= stm_ts_id,
+};
+
+static int __init stm_ts_init(void)
+{
+	stmtouch_wq = create_singlethread_workqueue("stmtouch_wq");
+	if (!stmtouch_wq)
+		return -ENOMEM;
+
+	return i2c_add_driver(&stm_ts_driver);
+}
+
+static void __exit stm_ts_exit(void)
+{
+	i2c_del_driver(&stm_ts_driver);
+	if (stmtouch_wq)
+		destroy_workqueue(stmtouch_wq);
+}
+
+MODULE_DESCRIPTION("STM MultiTouch IC Driver");
+MODULE_AUTHOR("Li Wu <li.wu@st.com>");
+MODULE_LICENSE("GPL");
+
+module_init(stm_ts_init);
+module_exit(stm_ts_exit);