Patchwork [RFC,1/2] CMA3000 Accelerometer Driver

login
register
mail settings
Submitter Hemanth V
Date April 30, 2010, 2:43 p.m.
Message ID <12046.10.24.255.18.1272638611.squirrel@dbdmail.itg.ti.com>
Download mbox | patch
Permalink /patch/95884/
State New, archived
Headers show

Comments

Patch

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 16ec523..4752a00 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -319,4 +319,13 @@  config INPUT_PCAP
 	  To compile this driver as a module, choose M here: the
 	  module will be called pcap_keys.

+config INPUT_CMA3000_I2C
+	tristate "VTI CMA3000 Tri-axis accelerometer"
+	depends on I2C
+	help
+	  Say Y here if you want to use VTI CMA3000 Accelerometer
+	  through I2C interface.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cma3000_dxx
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index a8b8485..94d6eda 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -30,4 +30,4 @@  obj-$(CONFIG_INPUT_WINBOND_CIR)		+= winbond-cir.o
 obj-$(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_i2c.o cma3000_d0x.o
diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
new file mode 100644
index 0000000..c0d0ea1
--- /dev/null
+++ b/drivers/input/misc/cma3000_d0x.c
@@ -0,0 +1,627 @@ 
+/*
+ * 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_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 each of the seven bits,
+ * eight bit is the sign bit
+ */
+static int bit_to_2g[7] = {18, 36, 71, 143, 286, 571, 1142};
+static int bit_to_8g[7] = {71, 143, 286, 571, 1142, 2286, 4571};
+
+/*
+ * Conversion for each of the eight modes to g, depending
+ * on G range i.e 2G or 8G
+ */
+
+static int *mode_to_mg[8][2] = {
+	{NULL, NULL },
+	{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},
+	{NULL, NULL },
+};
+
+static ssize_t cma3000_show_attr_mode(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	ssize_t ret = 0;
+	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");
+	ret = sprintf(buf, "%d\n", (mode & CMA3000_MODEMASK) >> 1);
+	return ret;
+}
+
+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)
+		return error;
+
+	if (val < CMAMODE_DEFAULT || val > CMAMODE_POFF)
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+	val &= (CMA3000_MODEMASK >> 1);
+	ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	ctrl &= ~CMA3000_MODEMASK;
+	ctrl |= (val << 1);
+
+	data->pdata.mode = val;
+
+	disable_irq(data->client->irq);
+	cma3000_set(data, CMA3000_CTRL, ctrl, "ctrl");
+
+	/* Settling time delay required after mode change */
+	msleep(CMA3000_SETDELAY);
+
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	return count;
+}
+
+static ssize_t cma3000_show_attr_grange(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	ssize_t ret = 0;
+	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");
+	g_range = (mode & CMA3000_GRANGEMASK) ? CMARANGE_2G : CMARANGE_8G;
+	ret = sprintf(buf, "%d\n", g_range);
+
+	return ret;
+}
+
+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)
+		return error;
+
+	mutex_lock(&data->mutex);
+	ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
+	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_op_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);
+	cma3000_set(data, CMA3000_CTRL, ctrl, "ctrl");
+
+	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_op_failed:
+	mutex_unlock(&data->mutex);
+	return error;
+}
+
+static ssize_t cma3000_show_attr_mdthr(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	ssize_t ret = 0;
+	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");
+	ret = sprintf(buf, "%d\n", mode);
+
+	return ret;
+}
+
+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);
+	cma3000_set(data, CMA3000_MDTHR, val, "mdthr");
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	return count;
+}
+
+static ssize_t cma3000_show_attr_mdfftmr(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	ssize_t ret = 0;
+	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");
+	ret = sprintf(buf, "%d\n", mode);
+
+	return ret;
+}
+
+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);
+	cma3000_set(data, CMA3000_MDFFTMR, val, "mdthr");
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	return count;
+}
+
+static ssize_t cma3000_show_attr_ffthr(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	ssize_t ret = 0;
+	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");
+	ret = sprintf(buf, "%d\n", mode);
+
+	return ret;
+}
+
+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);
+	cma3000_set(data, CMA3000_FFTHR, val, "mdthr");
+	enable_irq(data->client->irq);
+	mutex_unlock(&data->mutex);
+
+	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 cma3000_create_sysfs(struct cma3000_accl_data *data)
+{
+	int ret;
+	ret = sysfs_create_group(&data->client->dev.kobj, &cma3000_attr_group);
+	if (ret)
+		dev_err(&data->client->dev,
+			"failed to create sysfs entries\n");
+
+}
+
+static void cma3000_remove_sysfs(struct cma3000_accl_data *data)
+{
+	sysfs_remove_group(&data->client->dev.kobj, &cma3000_attr_group);
+}
+
+static void decode_mg(struct cma3000_accl_data *data, int *datax,
+				int *datay, int *dataz)
+{
+	int i, tmpx = 0, tmpy = 0, tmpz = 0;
+
+	for (i = 0; i < 7; ++i) {
+		tmpx += (((*datax) & BIT(i)) >> i) * (data->bit_to_mg[i]);
+		tmpy += (((*datay) & BIT(i)) >> i) * (data->bit_to_mg[i]);
+		tmpz += (((*dataz) & BIT(i)) >> i) * (data->bit_to_mg[i]);
+
+	}
+
+	if ((*datax) & BIT(7))
+		*datax = -tmpx;
+	else
+		*datax = tmpx;
+
+	if ((*datay) & BIT(7))
+		*datay = -tmpy;
+	else
+		*datay = tmpy;
+
+	if ((*dataz) & BIT(7))
+		*dataz = -tmpz;
+	else
+		*dataz = tmpz;
+}
+
+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");
+
+	/* 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);
+	}
+
+
+	/* Delay required between each read for interrupt clearing */
+	datax = cma3000_read(data, CMA3000_DOUTX, "X");
+	udelay(CMA3000_INTDELAY);
+	datay = cma3000_read(data, CMA3000_DOUTY, "Y");
+	udelay(CMA3000_INTDELAY);
+	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 == NULL)
+		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) || (ret & CMA3000_STATUS_PERR)) {
+		dev_err(&data->client->dev, "Reset failed\n");
+		return -EIO;
+	}
+
+	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;
+	}
+
+
+	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;
+		}
+	}
+
+	cma3000_create_sysfs(data);
+
+	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);
+	cma3000_remove_sysfs(data);
+
+	return ret;
+}
diff --git a/drivers/input/misc/cma3000_d0x.h b/drivers/input/misc/cma3000_d0x.h
new file mode 100644
index 0000000..906d29e
--- /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..d2ad638
--- /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/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