Patchwork [RFC,V2,1/2] input: CMA3000 Accelerometer driver

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Submitter Hemanth V
Date May 21, 2010, 6:52 a.m.
Message ID <15445.10.24.255.17.1274424777.squirrel@dbdmail.itg.ti.com>
Download mbox | patch
Permalink /patch/101297/
State New, archived
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Patch

diff --git a/Documentation/input/cma3000_d0x.txt b/Documentation/input/cma3000_d0x.txt
new file mode 100644
index 0000000..29ab6b7
--- /dev/null
+++ b/Documentation/input/cma3000_d0x.txt
@@ -0,0 +1,112 @@ 
+Kernel driver for CMA3000-D0x
+============================
+
+Supported chips:
+* VTI CMA3000-D0x
+Datasheet:
+  CMA3000-D0X Product Family Specification 8281000A.02.pdf
+
+Author: Hemanth V <hemanthv@ti.com>
+
+
+Description
+-----------
+CMA3000 Tri-axis accelerometer supports Motion detect, Measurement and
+Free fall modes.
+
+Motion Detect Mode: Its the low power mode where interrupts are generated only
+when motion exceeds the defined thresholds.
+
+Measurement Mode: This mode is used to read the acceleration data on X,Y,Z
+axis and supports 400, 100, 40 Hz sample frequency.
+
+Free fall Mode: This mode is intented to save system resources.
+
+Threshold values: Chip supports defining threshold values for above modes
+which includes time and g value. Refer product specifications for more details.
+
+CMA3000 supports both I2C/SPI bus for communication, currently the driver
+supports I2C based communication.
+
+Driver reports acceleration data through input subsystem and supports sysfs
+for configuration changes. It generates ABS_MISC event with value 1 when
+free fall is detected.
+
+Platform data need to be configured for initial default values.
+
+Platform Data
+-------------
+fuzz_x: Noise on X Axis
+
+fuzz_y: Noise on Y Axis
+
+fuzz_z: Noise on Z Axis
+
+g_range: G range in milli g i.e 2000 or 8000
+
+mode: Default Operating mode
+
+mdthr: Motion detect threshold value
+
+mdfftmr: Motion detect and free fall time value
+
+ffthr: Free fall threshold value
+
+Input Interface
+--------------
+Input driver version is 1.0.0
+Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
+Input device name: "cma3000-acclerometer"
+Supported events:
+  Event type 0 (Sync)
+  Event type 3 (Absolute)
+    Event code 0 (X)
+      Value     47
+      Min    -8000
+      Max     8000
+      Fuzz     200
+    Event code 1 (Y)
+      Value    -28
+      Min    -8000
+      Max     8000
+      Fuzz     200
+    Event code 2 (Z)
+      Value    905
+      Min    -8000
+      Max     8000
+      Fuzz     200
+    Event code 40 (Misc)
+      Value      0
+      Min        0
+      Max        1
+  Event type 4 (Misc)
+
+Sysfs entries
+-------------
+
+mode:
+	0: power down mode
+	1: 100 Hz Measurement mode
+	2: 400 Hz Measurement mode
+	3: 40 Hz Measurement mode
+	4: Motion Detect mode (default)
+	5: 100 Hz Free fall mode
+	6: 40 Hz Free fall mode
+	7: Power off mode
+
+grange:
+	2000: 2000 mg or 2G Range
+	8000: 8000 mg or 8G Range
+
+mdthr:
+	X: X * 71mg (8G Range)
+	X: X * 18mg (2G Range)
+
+mdfftmr:
+	X: (X & 0x70) * 100 ms (MDTMR)
+	   (X & 0x0F) * 2.5 ms (FFTMR 400 Hz)
+	   (X & 0x0F) * 10 ms  (FFTMR 100 Hz)
+
+ffthr:
+       X: (X >> 2) * 18mg (2G Range)
+       X: (X & 0x0F) * 71 mg (8G Range)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 1cf25ee..043ee8d 100755
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -340,4 +340,11 @@ 
 	  To compile this driver as a module, choose M here: the
 	  module will be called pcap_keys.

+config INPUT_CMA3000_I2C
+	bool "VTI CMA3000 Tri-axis accelerometer"
+	depends on I2C && SYSFS
+	help
+	  Say Y here if you want to use VTI CMA3000 Accelerometer
+	  through I2C interface.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 07ee237..011161d 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -32,3 +32,4 @@ 
 obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
 obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
 obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
+obj-$(CONFIG_INPUT_CMA3000_I2C)		+= cma3000_d0x.o cma3000_d0x_i2c.o
diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
new file mode 100644
index 0000000..812c464
--- /dev/null
+++ b/drivers/input/misc/cma3000_d0x.c
@@ -0,0 +1,633 @@ 
+/*
+ * cma3000_d0x.c
+ * VTI CMA3000_D0x Accelerometer driver
+ *	Supports I2C/SPI interfaces
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Author: Hemanth V <hemanthv@ti.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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/cma3000.h>
+
+#include "cma3000_d0x.h"
+
+#define CMA3000_WHOAMI      0x00
+#define CMA3000_REVID       0x01
+#define CMA3000_CTRL        0x02
+#define CMA3000_STATUS      0x03
+#define CMA3000_RSTR        0x04
+#define CMA3000_INTSTATUS   0x05
+#define CMA3000_DOUTX       0x06
+#define CMA3000_DOUTY       0x07
+#define CMA3000_DOUTZ       0x08
+#define CMA3000_MDTHR       0x09
+#define CMA3000_MDFFTMR     0x0A
+#define CMA3000_FFTHR       0x0B
+
+#define CMA3000_RANGE2G    (1 << 7)
+#define CMA3000_RANGE8G    (0 << 7)
+#define CMA3000_BUSI2C     (0 << 4)
+#define CMA3000_MODEMASK   (7 << 1)
+#define CMA3000_GRANGEMASK (1 << 7)
+
+#define CMA3000_STATUS_PERR    1
+#define CMA3000_INTSTATUS_FFDET (1 << 2)
+
+/* Settling time delay in ms */
+#define CMA3000_SETDELAY    30
+
+/* Delay for clearing interrupt in us */
+#define CMA3000_INTDELAY    44
+
+
+/*
+ * Bit weights in mg for bit 0, other bits need
+ * multipy factor 2^n. Eight bit is the sign bit.
+ */
+#define BIT_TO_2G  18
+#define BIT_TO_8G  71
+
+/*
+ * Conversion for each of the eight modes to g, depending
+ * on G range i.e 2G or 8G. Some modes always operate in
+ * 8G.
+ */
+
+static int mode_to_mg[8][2] = {
+	{0, 0},
+	{BIT_TO_8G, BIT_TO_2G},
+	{BIT_TO_8G, BIT_TO_2G},
+	{BIT_TO_8G, BIT_TO_8G},
+	{BIT_TO_8G, BIT_TO_8G},
+	{BIT_TO_8G, BIT_TO_2G},
+	{BIT_TO_8G, BIT_TO_2G},
+	{0, 0},
+};
+
+static ssize_t cma3000_show_attr_mode(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	uint8_t mode;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+
+	mode = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	if (mode < 0)
+		return mode;
+
+	return sprintf(buf, "%d\n", (mode & CMA3000_MODEMASK) >> 1);
+}
+
+static ssize_t cma3000_store_attr_mode(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+	unsigned long val;
+	int error;
+	uint8_t ctrl;
+
+	error = strict_strtoul(buf, 0, &val);
+	if (error)
+		goto err_op3_failed;
+
+	if (val < CMAMODE_DEFAULT || val > CMAMODE_POFF) {
+		error = -EINVAL;
+		goto err_op3_failed;
+	}
+
+	mutex_lock(&data->mutex);
+	val &= (CMA3000_MODEMASK >> 1);
+	ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	if (ctrl < 0) {
+		error = ctrl;
+		goto err_op2_failed;
+	}
+
+	ctrl &= ~CMA3000_MODEMASK;
+	ctrl |= (val << 1);
+	data->pdata.mode = val;
+	disable_irq(data->client->irq);
+
+	error = cma3000_set(data, CMA3000_CTRL, ctrl, "ctrl");
+	if (error < 0)
+		goto err_op1_failed;
+
+	/* Settling time delay required after mode change */
+	msleep(CMA3000_SETDELAY);
+
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+	return count;
+
+err_op1_failed:
+	enable_irq(data->client->irq);
+err_op2_failed:
+	mutex_unlock(&data->mutex);
+err_op3_failed:
+	return error;
+}
+
+static ssize_t cma3000_show_attr_grange(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	uint8_t mode;
+	int g_range;
+
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+
+	mode = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	if (mode < 0)
+		return mode;
+
+	g_range = (mode & CMA3000_GRANGEMASK) ? CMARANGE_2G : CMARANGE_8G;
+	return sprintf(buf, "%d\n", g_range);
+}
+
+static ssize_t cma3000_store_attr_grange(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+	unsigned long val;
+	int error, g_range, fuzz_x, fuzz_y, fuzz_z;
+	uint8_t ctrl;
+
+	error = strict_strtoul(buf, 0, &val);
+	if (error)
+		goto err_op3_failed;
+
+	mutex_lock(&data->mutex);
+	ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	if (ctrl < 0) {
+		error = ctrl;
+		goto err_op2_failed;
+	}
+
+	ctrl &= ~CMA3000_GRANGEMASK;
+
+	if (val == CMARANGE_2G) {
+		ctrl |= CMA3000_RANGE2G;
+		data->pdata.g_range = CMARANGE_2G;
+	} else if (val == CMARANGE_8G) {
+		ctrl |= CMA3000_RANGE8G;
+		data->pdata.g_range = CMARANGE_8G;
+	} else {
+		error = -EINVAL;
+		goto err_op2_failed;
+	}
+
+	g_range = data->pdata.g_range;
+	fuzz_x = data->pdata.fuzz_x;
+	fuzz_y = data->pdata.fuzz_y;
+	fuzz_z = data->pdata.fuzz_z;
+
+	disable_irq(data->client->irq);
+	error = cma3000_set(data, CMA3000_CTRL, ctrl, "ctrl");
+	if (error < 0)
+		goto err_op1_failed;
+
+	input_set_abs_params(data->input_dev, ABS_X, -g_range,
+				g_range, fuzz_x, 0);
+	input_set_abs_params(data->input_dev, ABS_Y, -g_range,
+				g_range, fuzz_y, 0);
+	input_set_abs_params(data->input_dev, ABS_Z, -g_range,
+				g_range, fuzz_z, 0);
+
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+	return count;
+
+err_op1_failed:
+	enable_irq(data->client->irq);
+err_op2_failed:
+	mutex_unlock(&data->mutex);
+err_op3_failed:
+	return error;
+}
+
+static ssize_t cma3000_show_attr_mdthr(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	uint8_t mode;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+
+	mode = cma3000_read(data, CMA3000_MDTHR, "mdthr");
+	if (mode < 0)
+		return mode;
+
+	return sprintf(buf, "%d\n", mode);
+}
+
+static ssize_t cma3000_store_attr_mdthr(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+	unsigned long val;
+	int error;
+
+	error = strict_strtoul(buf, 0, &val);
+	if (error)
+		return error;
+
+	mutex_lock(&data->mutex);
+	data->pdata.mdthr = val;
+	disable_irq(data->client->irq);
+	error = cma3000_set(data, CMA3000_MDTHR, val, "mdthr");
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	/* If there was error during write, return error */
+	if (error < 0)
+		return error;
+	else
+		return count;
+}
+
+static ssize_t cma3000_show_attr_mdfftmr(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	uint8_t mode;
+
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+
+	mode = cma3000_read(data, CMA3000_MDFFTMR, "mdfftmr");
+	if (mode < 0)
+		return mode;
+
+	return sprintf(buf, "%d\n", mode);
+}
+
+static ssize_t cma3000_store_attr_mdfftmr(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+	unsigned long val;
+	int error;
+
+	error = strict_strtoul(buf, 0, &val);
+	if (error)
+		return error;
+
+	mutex_lock(&data->mutex);
+	data->pdata.mdfftmr = val;
+	disable_irq(data->client->irq);
+	error = cma3000_set(data, CMA3000_MDFFTMR, val, "mdthr");
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	/* If there was error during write, return error */
+	if (error < 0)
+		return error;
+	else
+		return count;
+}
+
+static ssize_t cma3000_show_attr_ffthr(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	uint8_t mode;
+
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+
+	mode = cma3000_read(data, CMA3000_FFTHR, "ffthr");
+	if (mode < 0)
+		return mode;
+
+	return sprintf(buf, "%d\n", mode);
+}
+
+static ssize_t cma3000_store_attr_ffthr(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cma3000_accl_data *data = platform_get_drvdata(pdev);
+	unsigned long val;
+	int error;
+
+	error = strict_strtoul(buf, 0, &val);
+	if (error)
+		return error;
+
+	mutex_lock(&data->mutex);
+	data->pdata.ffthr = val;
+	disable_irq(data->client->irq);
+	error = cma3000_set(data, CMA3000_FFTHR, val, "mdthr");
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	/* If there was error during write, return error */
+	if (error < 0)
+		return error;
+	else
+		return count;
+}
+
+static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
+		cma3000_show_attr_mode, cma3000_store_attr_mode);
+
+static DEVICE_ATTR(grange, S_IWUSR | S_IRUGO,
+		cma3000_show_attr_grange, cma3000_store_attr_grange);
+
+static DEVICE_ATTR(mdthr, S_IWUSR | S_IRUGO,
+		cma3000_show_attr_mdthr, cma3000_store_attr_mdthr);
+
+static DEVICE_ATTR(mdfftmr, S_IWUSR | S_IRUGO,
+		cma3000_show_attr_mdfftmr, cma3000_store_attr_mdfftmr);
+
+static DEVICE_ATTR(ffthr, S_IWUSR | S_IRUGO,
+		cma3000_show_attr_ffthr, cma3000_store_attr_ffthr);
+
+
+static struct attribute *cma_attrs[] = {
+	&dev_attr_mode.attr,
+	&dev_attr_grange.attr,
+	&dev_attr_mdthr.attr,
+	&dev_attr_mdfftmr.attr,
+	&dev_attr_ffthr.attr,
+	NULL,
+};
+
+static struct attribute_group cma3000_attr_group = {
+	.attrs = cma_attrs,
+};
+
+static void decode_mg(struct cma3000_accl_data *data, int *datax,
+				int *datay, int *dataz)
+{
+	/* Data in 2's complement, convert to mg */
+	*datax = (((s8)(*datax)) * (data->bit_to_mg));
+	*datay = (((s8)(*datay)) * (data->bit_to_mg));
+	*dataz = (((s8)(*dataz)) * (data->bit_to_mg));
+}
+
+static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
+{
+	struct cma3000_accl_data *data = dev_id;
+	int  datax, datay, dataz;
+	u8 ctrl, mode, range, intr_status;
+
+	intr_status = cma3000_read(data, CMA3000_INTSTATUS, "interrupt status");
+	if (intr_status < 0)
+		return IRQ_NONE;
+
+	/* Check if free fall is detected, report immediately */
+	if (intr_status & CMA3000_INTSTATUS_FFDET) {
+		input_report_abs(data->input_dev, ABS_MISC, 1);
+		input_sync(data->input_dev);
+	} else {
+		input_report_abs(data->input_dev, ABS_MISC, 0);
+	}
+
+	datax = cma3000_read(data, CMA3000_DOUTX, "X");
+	datay = cma3000_read(data, CMA3000_DOUTY, "Y");
+	dataz = cma3000_read(data, CMA3000_DOUTZ, "Z");
+
+	ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	mode = (ctrl & CMA3000_MODEMASK) >> 1;
+	range = (ctrl & CMA3000_GRANGEMASK) >> 7;
+
+	data->bit_to_mg = mode_to_mg[mode][range];
+
+	/* Interrupt not for this device */
+	if (data->bit_to_mg == 0)
+		return IRQ_NONE;
+
+	/* Decode register values to milli g */
+	decode_mg(data, &datax, &datay, &dataz);
+
+	input_report_abs(data->input_dev, ABS_X, datax);
+	input_report_abs(data->input_dev, ABS_Y, datay);
+	input_report_abs(data->input_dev, ABS_Z, dataz);
+	input_sync(data->input_dev);
+
+	return IRQ_HANDLED;
+}
+
+static int cma3000_reset(struct cma3000_accl_data *data)
+{
+	int ret;
+
+	/* Reset sequence */
+	cma3000_set(data, CMA3000_RSTR, 0x02, "Reset");
+	cma3000_set(data, CMA3000_RSTR, 0x0A, "Reset");
+	cma3000_set(data, CMA3000_RSTR, 0x04, "Reset");
+
+	/* Settling time delay */
+	mdelay(10);
+
+	ret = cma3000_read(data, CMA3000_STATUS, "Status");
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Reset failed\n");
+		return ret;
+	} else if (ret & CMA3000_STATUS_PERR) {
+		dev_err(&data->client->dev, "Parity Error\n");
+		return -EIO;
+	} else {
+		return 0;
+	}
+}
+
+int cma3000_poweron(struct cma3000_accl_data *data)
+{
+	uint8_t ctrl = 0, mdthr, mdfftmr, ffthr, mode;
+	int g_range, ret;
+
+	g_range = data->pdata.g_range;
+	mode = data->pdata.mode;
+	mdthr = data->pdata.mdthr;
+	mdfftmr = data->pdata.mdfftmr;
+	ffthr = data->pdata.ffthr;
+
+	if (mode < CMAMODE_DEFAULT || mode > CMAMODE_POFF) {
+		data->pdata.mode = CMAMODE_MOTDET;
+		mode = data->pdata.mode;
+		dev_info(&data->client->dev,
+			"Invalid mode specified, assuming Motion Detect\n");
+	}
+
+	if (g_range == CMARANGE_2G) {
+		ctrl = (mode << 1) | CMA3000_RANGE2G;
+	} else if (g_range == CMARANGE_8G) {
+		ctrl = (mode << 1) | CMA3000_RANGE8G;
+	} else {
+		dev_info(&data->client->dev,
+			"Invalid G range specified, assuming 8G\n");
+		ctrl = (mode << 1) | CMA3000_RANGE8G;
+		data->pdata.g_range = CMARANGE_8G;
+	}
+#ifdef CONFIG_INPUT_CMA3000_I2C
+	ctrl |= CMA3000_BUSI2C;
+#endif
+
+	cma3000_set(data, CMA3000_MDTHR, mdthr, "Motion Detect Threshold");
+	cma3000_set(data, CMA3000_MDFFTMR, mdfftmr, "Time register");
+	cma3000_set(data, CMA3000_FFTHR, ffthr, "Free fall threshold");
+	ret = cma3000_set(data, CMA3000_CTRL, ctrl, "Mode setting");
+	if (ret < 0)
+		return -EIO;
+
+	mdelay(CMA3000_SETDELAY);
+
+	return 0;
+}
+
+int cma3000_poweroff(struct cma3000_accl_data *data)
+{
+	int ret;
+
+	ret = cma3000_set(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
+	mdelay(CMA3000_SETDELAY);
+
+	return ret;
+}
+
+int cma3000_init(struct cma3000_accl_data *data)
+{
+	int ret = 0, fuzz_x, fuzz_y, fuzz_z, g_range;
+	uint32_t irqflags;
+
+	if (data->client->dev.platform_data == NULL) {
+		dev_err(&data->client->dev, "platform data not found\n");
+		goto err_op2_failed;
+	}
+
+	memcpy(&(data->pdata), data->client->dev.platform_data,
+		sizeof(struct cma3000_platform_data));
+
+	ret = cma3000_reset(data);
+	if (ret)
+		goto err_op2_failed;
+
+	ret = cma3000_read(data, CMA3000_REVID, "Revid");
+	if (ret < 0)
+		goto err_op2_failed;
+
+	pr_info("CMA3000 Acclerometer : Revision %x\n", ret);
+
+	/* Bring it out of default power down state */
+	ret = cma3000_poweron(data);
+	if (ret < 0)
+		goto err_op2_failed;
+
+	fuzz_x = data->pdata.fuzz_x;
+	fuzz_y = data->pdata.fuzz_y;
+	fuzz_z = data->pdata.fuzz_z;
+	g_range = data->pdata.g_range;
+	irqflags = data->pdata.irqflags;
+
+	data->input_dev = input_allocate_device();
+	if (data->input_dev == NULL) {
+		ret = -ENOMEM;
+		dev_err(&data->client->dev,
+			"Failed to allocate input device\n");
+		goto err_op2_failed;
+	}
+
+	data->input_dev->name = "cma3000-acclerometer";
+
+#ifdef CONFIG_INPUT_CMA3000_I2C
+	data->input_dev->id.bustype = BUS_I2C;
+#endif
+
+	 __set_bit(EV_ABS, data->input_dev->evbit);
+	 __set_bit(EV_MSC, data->input_dev->evbit);
+
+	input_set_abs_params(data->input_dev, ABS_X, -g_range,
+				g_range, fuzz_x, 0);
+	input_set_abs_params(data->input_dev, ABS_Y, -g_range,
+				g_range, fuzz_y, 0);
+	input_set_abs_params(data->input_dev, ABS_Z, -g_range,
+				g_range, fuzz_z, 0);
+	input_set_abs_params(data->input_dev, ABS_MISC, 0,
+				1, 0, 0);
+
+	ret = input_register_device(data->input_dev);
+	if (ret) {
+		dev_err(&data->client->dev,
+			"Unable to register input device\n");
+		goto err_op2_failed;
+	}
+
+	mutex_init(&data->mutex);
+
+	if (data->client->irq) {
+		ret = request_threaded_irq(data->client->irq, NULL,
+					cma3000_thread_irq,
+					irqflags | IRQF_ONESHOT,
+					data->client->name, data);
+
+		if (ret < 0) {
+			dev_err(&data->client->dev,
+				"request_threaded_irq failed\n");
+			goto err_op1_failed;
+		}
+	}
+
+	ret = sysfs_create_group(&data->client->dev.kobj, &cma3000_attr_group);
+	if (ret) {
+		dev_err(&data->client->dev,
+			"failed to create sysfs entries\n");
+		goto err_op1_failed;
+	}
+	return 0;
+
+err_op1_failed:
+	mutex_destroy(&data->mutex);
+	input_unregister_device(data->input_dev);
+err_op2_failed:
+	if (data != NULL) {
+		if (data->input_dev != NULL)
+			input_free_device(data->input_dev);
+	}
+
+	return ret;
+}
+
+int cma3000_exit(struct cma3000_accl_data *data)
+{
+	int ret;
+
+	ret = cma3000_poweroff(data);
+
+	if (data->client->irq)
+		free_irq(data->client->irq, data);
+
+	mutex_destroy(&data->mutex);
+	input_unregister_device(data->input_dev);
+	input_free_device(data->input_dev);
+	sysfs_remove_group(&data->client->dev.kobj, &cma3000_attr_group);
+	return ret;
+}
diff --git a/drivers/input/misc/cma3000_d0x.h b/drivers/input/misc/cma3000_d0x.h
new file mode 100644
index 0000000..12a8faf
--- /dev/null
+++ b/drivers/input/misc/cma3000_d0x.h
@@ -0,0 +1,46 @@ 
+/*
+ * cma3000_d0x.h
+ * VTI CMA3000_D0x Accelerometer driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Author: Hemanth V <hemanthv@ti.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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INPUT_CMA3000_H
+#define INPUT_CMA3000_H
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+
+struct cma3000_accl_data {
+#ifdef CONFIG_INPUT_CMA3000_I2C
+	struct i2c_client *client;
+#endif
+	struct input_dev *input_dev;
+	struct cma3000_platform_data pdata;
+
+	/* mutex for sysfs operations */
+	struct mutex mutex;
+	int bit_to_mg;
+};
+
+int cma3000_set(struct cma3000_accl_data *, u8, u8, char *);
+int cma3000_read(struct cma3000_accl_data *, u8, char *);
+int cma3000_init(struct cma3000_accl_data *);
+int cma3000_exit(struct cma3000_accl_data *);
+int cma3000_poweron(struct cma3000_accl_data *);
+int cma3000_poweroff(struct cma3000_accl_data *);
+
+#endif
diff --git a/drivers/input/misc/cma3000_d0x_i2c.c b/drivers/input/misc/cma3000_d0x_i2c.c
new file mode 100644
index 0000000..41f845c
--- /dev/null
+++ b/drivers/input/misc/cma3000_d0x_i2c.c
@@ -0,0 +1,136 @@ 
+/*
+ * cma3000_d0x_i2c.c
+ *
+ * Implements I2C interface for VTI CMA300_D0x Accelerometer driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Author: Hemanth V <hemanthv@ti.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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c/cma3000.h>
+#include "cma3000_d0x.h"
+
+int cma3000_set(struct cma3000_accl_data *accl, u8 reg, u8 val, char *msg)
+{
+	int ret = i2c_smbus_write_byte_data(accl->client, reg, val);
+	if (ret < 0)
+		dev_err(&accl->client->dev,
+			"i2c_smbus_write_byte_data failed (%s)\n", msg);
+	return ret;
+}
+
+int cma3000_read(struct cma3000_accl_data *accl, u8 reg, char *msg)
+{
+	int ret = i2c_smbus_read_byte_data(accl->client, reg);
+	if (ret < 0)
+		dev_err(&accl->client->dev,
+			"i2c_smbus_read_byte_data failed (%s)\n", msg);
+	return ret;
+}
+
+static int __devinit cma3000_accl_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	int ret;
+	struct cma3000_accl_data *data = NULL;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL) {
+		ret = -ENOMEM;
+		goto err_op_failed;
+	}
+
+	data->client = client;
+	i2c_set_clientdata(client, data);
+
+	ret = cma3000_init(data);
+	if (ret)
+		goto err_op_failed;
+
+	return 0;
+
+err_op_failed:
+
+	if (data != NULL)
+		kfree(data);
+
+	return ret;
+}
+
+static int __devexit cma3000_accl_remove(struct i2c_client *client)
+{
+	struct cma3000_accl_data *data = i2c_get_clientdata(client);
+	int ret;
+
+	ret = cma3000_exit(data);
+	i2c_set_clientdata(client, NULL);
+	kfree(data);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM
+static int cma3000_accl_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	struct cma3000_accl_data *data = i2c_get_clientdata(client);
+
+	return cma3000_poweroff(data);
+}
+
+static int cma3000_accl_resume(struct i2c_client *client)
+{
+	struct cma3000_accl_data *data = i2c_get_clientdata(client);
+
+	return cma3000_poweron(data);
+}
+#endif
+
+static const struct i2c_device_id cma3000_id[] = {
+	{ "cma3000_accl", 0 },
+	{ },
+};
+
+static struct i2c_driver cma3000_accl_driver = {
+	.probe		= cma3000_accl_probe,
+	.remove		= cma3000_accl_remove,
+	.id_table	= cma3000_id,
+#ifdef CONFIG_PM
+	.suspend	= cma3000_accl_suspend,
+	.resume		= cma3000_accl_resume,
+#endif
+	.driver = {
+		.name = "cma3000_accl"
+	},
+};
+
+static int __init cma3000_accl_init(void)
+{
+	return i2c_add_driver(&cma3000_accl_driver);
+}
+
+static void __exit cma3000_accl_exit(void)
+{
+	i2c_del_driver(&cma3000_accl_driver);
+}
+
+module_init(cma3000_accl_init);
+module_exit(cma3000_accl_exit);
+
+MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");
diff --git a/include/linux/i2c/cma3000.h b/include/linux/i2c/cma3000.h
new file mode 100644
index 0000000..50aa3fc
--- /dev/null
+++ b/include/linux/i2c/cma3000.h
@@ -0,0 +1,60 @@ 
+/*
+ * cma3000.h
+ * VTI CMA300_Dxx Accelerometer driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Author: Hemanth V <hemanthv@ti.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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _LINUX_CMA3000_I2C_H
+#define _LINUX_CMA3000_I2C_H
+
+#define CMAMODE_DEFAULT    0
+#define CMAMODE_MEAS100    1
+#define CMAMODE_MEAS400    2
+#define CMAMODE_MEAS40     3
+#define CMAMODE_MOTDET     4
+#define CMAMODE_FF100      5
+#define CMAMODE_FF400      6
+#define CMAMODE_POFF       7
+
+#define CMARANGE_2G   2000
+#define CMARANGE_8G   8000
+
+/**
+ * struct cma3000_i2c_platform_data - CMA3000 Platform data
+ * @fuzz_x: Noise on X Axis
+ * @fuzz_y: Noise on Y Axis
+ * @fuzz_z: Noise on Z Axis
+ * @g_range: G range in milli g i.e 2000 or 8000
+ * @mode: Operating mode
+ * @mdthr: Motion detect threshold value
+ * @mdfftmr: Motion detect and free fall time value
+ * @ffthr: Free fall threshold value
+ */
+
+struct cma3000_platform_data {
+	int fuzz_x;
+	int fuzz_y;
+	int fuzz_z;
+	int g_range;
+	uint8_t  mode;
+	uint8_t  mdthr;
+	uint8_t  mdfftmr;
+	uint8_t  ffthr;
+	uint32_t  irqflags;
+};
+
+#endif