[PATCH] input: smb380 accelerometer driver

[Donggeun Kim <dg77.kim@samsung.com>]

This patch supports driver for BOSCH SMB380 and BMA023 which are accelerometers.

Basically, this driver will read x, y, and z coordinate registers from the device and report the values to users through sysfs interface.
The result values range from -512 to 511 respectively.

The driver allows to set or get the device's properties by the sysfs attributes.

sysfs attributes
----------------------
range: indicate the full scale acceleration range
	0: +/-2g (default)
	1: +/-4g
	2: +/-8g
bandwidth: indicate the digital filtering of ADC output data to obtain the desired bandwidth
	0: 25Hz (default)
	1: 50Hz
	2: 100Hz
	3: 190Hz
	4: 375Hz
	5: 750Hz
	6: 1500Hz
new_data_int: generate an interrupt when all three axes acceleration values are new
	0: disable (default)
	1: enable
hg_int: generate an interrupt when the high-g threshold criteria are met
	0: disable
	1: enable (default)
lg_int: generate an interrupt when the low-g threshold criteria are met
	0: disable
	1: enable (default)
hg_dur:
	0 - 255: define a high-g interrupt criterion for duration
	150: default
hg_hyst:
	0 - 7: define a high-g interrupt criterion
	0: default
hg_thres:
	0 - 255: define a high-g interrupt criterion
	160: default
lg_dur:
	0 - 255: define a low-g interrupt criterion for duration
	150: default
lg_hyst:
	0 - 7: define a high-g interrupt criterion
	0: default
lg_thres:
	0 - 255: define a high-g interrupt criterion
	20: default

Thank you.
- Donggeun

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/input/misc/Kconfig  |    8 +
 drivers/input/misc/Makefile |    1 +
 drivers/input/misc/smb380.c |  710 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/smb380.h      |   47 +++
 4 files changed, 766 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/misc/smb380.c
 create mode 100644 include/linux/smb380.h

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index c44b9ea..f709790 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -390,4 +390,12 @@ config INPUT_PCAP
 	  To compile this driver as a module, choose M here: the
 	  module will be called pcap_keys.
 
+config INPUT_SMB380
+	tristate "SMB380 Triaxial acceleration sensor"
+	depends on I2C
+	help
+	  This driver provides support for the Bosche Sensortec Triaxial
+	  Acceleration Sensor IC, which provides measurements of acceleration
+	  in prependicular axes as well as absolute temperature measurement.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 71fe57d..bb0eaba 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -37,4 +37,5 @@ 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_SMB380)		+= smb380.o
 
diff --git a/drivers/input/misc/smb380.c b/drivers/input/misc/smb380.c
new file mode 100644
index 0000000..5a61ee7
--- /dev/null
+++ b/drivers/input/misc/smb380.c
@@ -0,0 +1,710 @@
+/*
+ * smb380.c - SMB380 Tri-axis accelerometer driver
+ *
+ * Copyright (C) 2010 Samsung Eletronics Co.Ltd
+ * Kim Kyuwon <q1.kim@samsung.com>
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ * Donggeun Kim <dg77.kim@samsung.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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/smb380.h>
+
+#define SMB380_CHIP_ID_REG	0x00
+#define SMB380_X_LSB_REG	0x02
+#define SMB380_X_MSB_REG	0x03
+#define SMB380_Y_LSB_REG	0x04
+#define SMB380_Y_MSB_REG	0x05
+#define SMB380_Z_LSB_REG	0x06
+#define SMB380_Z_MSB_REG	0x07
+#define SMB380_TEMP_REG		0x08
+#define SMB380_CTRL1_REG	0x0a
+#define SMB380_CTRL2_REG	0x0b
+#define SMB380_SETTINGS1_REG	0x0c
+#define SMB380_SETTINGS2_REG	0x0d
+#define SMB380_SETTINGS3_REG	0x0e
+#define SMB380_SETTINGS4_REG	0x0f
+#define SMB380_SETTINGS5_REG	0x10
+#define SMB380_SETTINGS6_REG	0x11
+#define SMB380_RANGE_BW_REG	0x14
+#define SMB380_CONF2_REG	0x15
+
+#define SMB380_CHIP_ID		0x2
+
+#define SMB380_NEW_DATA_INT_SHIFT	5
+#define SMB380_NEW_DATA_INT_MASK	(0x1 << 5)
+
+#define SMB380_RANGE_SHIFT		3
+#define SMB380_RANGE_MASK		(0x3 << 3)
+#define SMB380_BANDWIDTH_SHIFT		0
+#define SMB380_BANDWIDTH_MASK		(0x7)
+
+#define SMB380_HG_HYST_SHIFT		3
+#define SMB380_HG_HYST_MASK		(0x7 << 3)
+#define SMB380_LG_HYST_SHIFT		0
+#define SMB380_LG_HYST_MASK		(0x7)
+
+#define SMB380_HG_DUR_SHIFT		(0x0)
+#define SMB380_HG_DUR_MASK		(0xff)
+#define SMB380_HG_THRES_SHIFT		(0x0)
+#define SMB380_HG_THRES_MASK		(0xff)
+#define SMB380_LG_DUR_SHIFT		(0x0)
+#define SMB380_LG_DUR_MASK		(0xff)
+#define SMB380_LG_THRES_SHIFT		(0x0)
+#define SMB380_LG_THRES_MASK		(0xff)
+
+#define SMB380_ENABLE_HG_SHIFT		1
+#define SMB380_ENABLE_HG_MASK		(0x1 << 1)
+#define SMB380_ENABLE_LG_SHIFT		0
+#define SMB380_ENABLE_LG_MASK		(0x1)
+
+#define SMB380_SLEEP_SHIFT		0
+#define SMB380_SLEEP_MASK		(0x1)
+
+#define SMB380_ACCEL_BITS		10
+#define SMB380_MAX_VALUE		((1 << ((SMB380_ACCEL_BITS) - 1)) - 1)
+#define SMB380_MIN_VALUE		(-(1 << ((SMB380_ACCEL_BITS) - 1)))
+
+#define SMB380_DEFAULT_RANGE		RANGE_2G
+#define SMB380_DEFAULT_BANDWIDTH	BW_25HZ
+#define SMB380_DEFAULT_NEW_DATA_INT	0
+#define SMB380_DEFAULT_HG_INT		1
+#define SMB380_DEFAULT_LG_INT		1
+#define SMB380_DEFAULT_HG_DURATION	0x96
+#define SMB380_DEFAULT_HG_THRESHOLD	0xa0
+#define SMB380_DEFAULT_HG_HYST		0
+#define SMB380_DEFAULT_LG_DURATION	0x96
+#define SMB380_DEFAULT_LG_THRESHOLD	0x14
+#define SMB380_DEFAULT_LG_HYST		0
+
+struct smb380_data {
+	s16 x;
+	s16 y;
+	s16 z;
+	u8 temp;
+};
+
+struct smb380_sensor {
+	struct i2c_client	*client;
+	struct device		*dev;
+	struct input_dev	*idev;
+	struct work_struct	work;
+	struct mutex		lock;
+
+	struct smb380_data data;
+	enum scale_range range;
+	enum filter_bw bandwidth;
+	u8 new_data_int;
+	u8 hg_int;
+	u8 lg_int;
+	u8 lg_dur;
+	u8 lg_thres;
+	u8 lg_hyst;
+	u8 hg_dur;
+	u8 hg_thres;
+	u8 hg_hyst;
+};
+
+static int smb380_write_reg(struct i2c_client *client, u8 reg, u8 val)
+{
+	int ret;
+
+	/*
+	 * Accorting to the datasheet, the interrupt should be deactivated
+	 * on the microprocessor side when write sequences operate
+	 */
+	disable_irq_nosync(client->irq);
+	ret = i2c_smbus_write_byte_data(client, reg, val);
+	enable_irq(client->irq);
+
+	if (ret < 0)
+		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+			__func__, reg, val, ret);
+	return ret;
+}
+
+static int smb380_read_reg(struct i2c_client *client, u8 reg)
+{
+	int ret = i2c_smbus_read_byte_data(client, reg);
+
+	if (ret < 0)
+		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
+			__func__, reg, ret);
+	return ret;
+}
+
+static int smb380_xyz_read_reg(struct i2c_client *client,
+			       u8 *buffer, int length)
+{
+	struct i2c_msg msg[] = {
+		{
+			.addr = client->addr,
+			.flags = 0,
+			.len = 1,
+			.buf = buffer,
+		}, {
+			.addr = client->addr,
+			.flags = I2C_M_RD,
+			.len = length,
+			.buf = buffer,
+		},
+	};
+	return i2c_transfer(client->adapter, msg, 2);
+}
+
+static int smb380_set_reg_bits(struct i2c_client *client,
+					int val, int shift, u8 mask, u8 reg)
+{
+	u8 data = smb380_read_reg(client, reg);
+
+	data = (data & ~mask) | ((val << shift) & mask);
+	return smb380_write_reg(client, reg, data);
+}
+
+static u8 smb380_get_reg_bits(struct i2c_client *client, int shift,
+					u8 mask, u8 reg)
+{
+	u8 data = smb380_read_reg(client, reg);
+
+	data = (data & mask) >> shift;
+	return data;
+}
+
+static int smb380_set_range(struct i2c_client *client, enum scale_range range)
+{
+	return smb380_set_reg_bits(client, range, SMB380_RANGE_SHIFT,
+				   SMB380_RANGE_MASK, SMB380_RANGE_BW_REG);
+}
+
+static u8 smb380_get_range(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_RANGE_SHIFT,
+				   SMB380_RANGE_MASK, SMB380_RANGE_BW_REG);
+}
+
+static int smb380_set_bandwidth(struct i2c_client *client, enum filter_bw bw)
+{
+	return smb380_set_reg_bits(client, bw, SMB380_BANDWIDTH_SHIFT,
+				   SMB380_BANDWIDTH_MASK, SMB380_RANGE_BW_REG);
+}
+
+static u8 smb380_get_bandwidth(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_BANDWIDTH_SHIFT,
+				   SMB380_BANDWIDTH_MASK, SMB380_RANGE_BW_REG);
+}
+
+static int smb380_set_new_data_int(struct i2c_client *client, u8 val)
+{
+	return smb380_set_reg_bits(client, val, SMB380_NEW_DATA_INT_SHIFT,
+				   SMB380_NEW_DATA_INT_MASK, SMB380_CONF2_REG);
+}
+
+static u8 smb380_get_new_data_int(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_NEW_DATA_INT_SHIFT,
+				   SMB380_NEW_DATA_INT_MASK, SMB380_CONF2_REG);
+}
+
+static int smb380_set_hg_int(struct i2c_client *client, u8 val)
+{
+	return smb380_set_reg_bits(client, val, SMB380_ENABLE_HG_SHIFT,
+				   SMB380_ENABLE_HG_MASK, SMB380_CTRL2_REG);
+}
+
+static u8 smb380_get_hg_int(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_ENABLE_HG_SHIFT,
+				   SMB380_ENABLE_HG_MASK, SMB380_CTRL2_REG);
+}
+
+static int smb380_set_lg_int(struct i2c_client *client, u8 val)
+{
+	return smb380_set_reg_bits(client, val,	SMB380_ENABLE_LG_SHIFT,
+				   SMB380_ENABLE_LG_MASK, SMB380_CTRL2_REG);
+}
+
+static u8 smb380_get_lg_int(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_ENABLE_LG_SHIFT,
+				   SMB380_ENABLE_LG_MASK, SMB380_CTRL2_REG);
+}
+
+static int smb380_set_lg_dur(struct i2c_client *client, u8 dur)
+{
+	return smb380_set_reg_bits(client, dur,	SMB380_LG_DUR_SHIFT,
+				   SMB380_LG_DUR_MASK, SMB380_SETTINGS2_REG);
+}
+
+static u8 smb380_get_lg_dur(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_LG_DUR_SHIFT,
+				   SMB380_LG_DUR_MASK, SMB380_SETTINGS2_REG);
+}
+
+static int smb380_set_lg_thres(struct i2c_client *client, u8 thres)
+{
+	return smb380_set_reg_bits(client, thres, SMB380_LG_THRES_SHIFT,
+				   SMB380_LG_THRES_MASK, SMB380_SETTINGS1_REG);
+}
+
+static u8 smb380_get_lg_thres(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_LG_THRES_SHIFT,
+				   SMB380_LG_THRES_MASK, SMB380_SETTINGS1_REG);
+}
+
+static int smb380_set_lg_hyst(struct i2c_client *client, u8 hyst)
+{
+	return smb380_set_reg_bits(client, hyst, SMB380_LG_HYST_SHIFT,
+				   SMB380_LG_HYST_MASK, SMB380_SETTINGS6_REG);
+}
+
+static u8 smb380_get_lg_hyst(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_LG_HYST_SHIFT,
+				   SMB380_LG_HYST_MASK,	SMB380_SETTINGS6_REG);
+}
+
+static int smb380_set_hg_dur(struct i2c_client *client, u8 dur)
+{
+	return smb380_set_reg_bits(client, dur,	SMB380_HG_DUR_SHIFT,
+				   SMB380_HG_DUR_MASK, SMB380_SETTINGS4_REG);
+}
+
+static u8 smb380_get_hg_dur(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_HG_DUR_SHIFT,
+				   SMB380_HG_DUR_MASK, SMB380_SETTINGS4_REG);
+}
+
+static int smb380_set_hg_thres(struct i2c_client *client, u8 thres)
+{
+	return smb380_set_reg_bits(client, thres, SMB380_HG_THRES_SHIFT,
+				   SMB380_HG_THRES_MASK, SMB380_SETTINGS3_REG);
+}
+
+static u8 smb380_get_hg_thres(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_HG_THRES_SHIFT,
+				   SMB380_HG_THRES_MASK, SMB380_SETTINGS3_REG);
+}
+
+static int smb380_set_hg_hyst(struct i2c_client *client, u8 hyst)
+{
+	return smb380_set_reg_bits(client, hyst, SMB380_HG_HYST_SHIFT,
+				   SMB380_HG_HYST_MASK,	SMB380_SETTINGS6_REG);
+}
+
+static u8 smb380_get_hg_hyst(struct i2c_client *client)
+{
+	return smb380_get_reg_bits(client, SMB380_HG_HYST_SHIFT,
+				   SMB380_HG_HYST_MASK,	SMB380_SETTINGS6_REG);
+}
+
+static int smb380_set_sleep(struct i2c_client *client, u8 val)
+{
+	return smb380_set_reg_bits(client, val,	SMB380_SLEEP_SHIFT,
+				   SMB380_SLEEP_MASK, SMB380_CTRL1_REG);
+}
+
+/*
+ * The description of the digital signals x, y and z is "2' complement".
+ * So we need to correct the sign of data read by i2c.
+ */
+static inline void smb380_correct_accel_sign(s16 *val)
+{
+	*val <<= (sizeof(s16) * BITS_PER_BYTE - SMB380_ACCEL_BITS);
+	*val >>= (sizeof(s16) * BITS_PER_BYTE - SMB380_ACCEL_BITS);
+}
+
+static void smb380_merge_register_values(struct i2c_client *client, s16 *val,
+					 u8 lsb, u8 msb)
+{
+	*val = (msb << 2) | (lsb >> 6);
+	smb380_correct_accel_sign(val);
+}
+
+/*
+ * Read 8 bit temperature.
+ * An output of 0 equals -30C, 1 LSB equals 0.5C
+ */
+static void smb380_read_temperature(struct i2c_client *client, u8 *temper)
+{
+	*temper = smb380_read_reg(client, SMB380_TEMP_REG);
+
+	dev_dbg(&client->dev, "%s: %d\n", __func__, *temper);
+}
+
+static void smb380_read_xyz(struct i2c_client *client,
+			    s16 *x, s16 *y, s16 *z)
+{
+	u8 buffer[6];
+	buffer[0] = SMB380_X_LSB_REG;
+	smb380_xyz_read_reg(client, buffer, 6);
+
+	smb380_merge_register_values(client, x, buffer[0], buffer[1]);
+	smb380_merge_register_values(client, y, buffer[2], buffer[3]);
+	smb380_merge_register_values(client, z, buffer[4], buffer[5]);
+
+	dev_dbg(&client->dev, "%s: x %d, y %d, z %d\n", __func__, *x, *y, *z);
+}
+
+static ssize_t smb380_show_xyz(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct smb380_sensor *sensor = dev_get_drvdata(dev);
+
+	mutex_lock(&sensor->lock);
+	smb380_read_xyz(sensor->client,
+		&sensor->data.x, &sensor->data.y, &sensor->data.z);
+	mutex_unlock(&sensor->lock);
+
+	return sprintf(buf, "%d, %d, %d\n",
+		sensor->data.x, sensor->data.y, sensor->data.z);
+}
+static DEVICE_ATTR(xyz, S_IRUGO, smb380_show_xyz, NULL);
+
+static ssize_t smb380_show_temper(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct smb380_sensor *sensor = dev_get_drvdata(dev);
+
+	mutex_lock(&sensor->lock);
+	smb380_read_temperature(sensor->client, &sensor->data.temp);
+	mutex_unlock(&sensor->lock);
+	return sprintf(buf, "%d\n", sensor->data.temp);
+}
+static DEVICE_ATTR(temperature, S_IRUGO, smb380_show_temper, NULL);
+
+#define SMB380_ADJUST(name) \
+static ssize_t smb380_show_##name(struct device *dev, \
+		struct device_attribute *att, char *buf) \
+{ \
+	struct smb380_sensor *sensor = dev_get_drvdata(dev); \
+ \
+	return sprintf(buf, "%d\n", sensor->name); \
+} \
+static ssize_t smb380_store_##name(struct device *dev, \
+		struct device_attribute *attr, const char *buf, size_t count) \
+{ \
+	struct smb380_sensor *sensor = dev_get_drvdata(dev); \
+	unsigned long val; \
+	int ret; \
+	u8 result; \
+ \
+	ret = strict_strtoul(buf, 10, &val); \
+	if (!ret) { \
+		smb380_set_##name(sensor->client, val); \
+		result = smb380_get_##name(sensor->client); \
+		mutex_lock(&sensor->lock); \
+		sensor->name = result; \
+		mutex_unlock(&sensor->lock); \
+		return count; \
+	} \
+	else \
+		return ret; \
+} \
+static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, \
+		smb380_show_##name, smb380_store_##name);
+
+SMB380_ADJUST(range);
+SMB380_ADJUST(bandwidth);
+SMB380_ADJUST(new_data_int);
+SMB380_ADJUST(hg_int);
+SMB380_ADJUST(lg_int);
+SMB380_ADJUST(lg_dur);
+SMB380_ADJUST(lg_thres);
+SMB380_ADJUST(lg_hyst);
+SMB380_ADJUST(hg_dur);
+SMB380_ADJUST(hg_thres);
+SMB380_ADJUST(hg_hyst);
+
+static struct attribute *smb380_attributes[] = {
+	&dev_attr_xyz.attr,
+	&dev_attr_temperature.attr,
+	&dev_attr_range.attr,
+	&dev_attr_bandwidth.attr,
+	&dev_attr_new_data_int.attr,
+	&dev_attr_hg_int.attr,
+	&dev_attr_lg_int.attr,
+	&dev_attr_lg_dur.attr,
+	&dev_attr_lg_thres.attr,
+	&dev_attr_lg_hyst.attr,
+	&dev_attr_hg_dur.attr,
+	&dev_attr_hg_thres.attr,
+	&dev_attr_hg_hyst.attr,
+	NULL
+};
+
+static const struct attribute_group smb380_group = {
+	.attrs	= smb380_attributes,
+};
+
+static void smb380_work(struct work_struct *work)
+{
+	struct smb380_sensor *sensor =
+			container_of(work, struct smb380_sensor, work);
+
+	smb380_read_xyz(sensor->client,
+		&sensor->data.x, &sensor->data.y, &sensor->data.z);
+	smb380_read_temperature(sensor->client, &sensor->data.temp);
+
+	mutex_lock(&sensor->lock);
+	input_report_abs(sensor->idev, ABS_X, sensor->data.x);
+	input_report_abs(sensor->idev, ABS_Y, sensor->data.y);
+	input_report_abs(sensor->idev, ABS_Z, sensor->data.z);
+	input_sync(sensor->idev);
+	mutex_unlock(&sensor->lock);
+
+	enable_irq(sensor->client->irq);
+}
+
+static irqreturn_t smb380_irq(int irq, void *dev_id)
+{
+	struct smb380_sensor *sensor = dev_id;
+
+	if (!work_pending(&sensor->work)) {
+		disable_irq_nosync(irq);
+		schedule_work(&sensor->work);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void smb380_initialize(struct smb380_sensor *sensor)
+{
+	smb380_set_range(sensor->client, sensor->range);
+	smb380_set_bandwidth(sensor->client, sensor->bandwidth);
+	smb380_set_new_data_int(sensor->client, sensor->new_data_int);
+	smb380_set_hg_dur(sensor->client, sensor->hg_dur);
+	smb380_set_hg_thres(sensor->client, sensor->hg_thres);
+	smb380_set_hg_hyst(sensor->client, sensor->hg_hyst);
+	smb380_set_lg_dur(sensor->client, sensor->lg_dur);
+	smb380_set_lg_thres(sensor->client, sensor->lg_thres);
+	smb380_set_lg_hyst(sensor->client, sensor->lg_hyst);
+	smb380_set_hg_int(sensor->client, sensor->hg_int);
+	smb380_set_lg_int(sensor->client, sensor->lg_int);
+}
+
+static void smb380_unregister_input_device(struct smb380_sensor *sensor)
+{
+	struct i2c_client *client = sensor->client;
+
+	if (client->irq > 0)
+		free_irq(client->irq, sensor);
+
+	input_unregister_device(sensor->idev);
+	sensor->idev = NULL;
+}
+
+static int smb380_register_input_device(struct smb380_sensor *sensor)
+{
+	struct i2c_client *client = sensor->client;
+	struct input_dev *idev;
+	int ret;
+
+	idev = sensor->idev = input_allocate_device();
+	if (!idev) {
+		dev_err(&client->dev, "allocating input device is failed\n");
+		ret = -ENOMEM;
+		goto failed_alloc;
+	}
+
+	idev->name = "SMB380 Sensor";
+	idev->id.bustype = BUS_I2C;
+	idev->dev.parent = &client->dev;
+	idev->evbit[0] = BIT_MASK(EV_ABS);
+
+	input_set_abs_params(idev, ABS_X, SMB380_MIN_VALUE,
+			SMB380_MAX_VALUE, 0, 0);
+	input_set_abs_params(idev, ABS_Y, SMB380_MIN_VALUE,
+			SMB380_MAX_VALUE, 0, 0);
+	input_set_abs_params(idev, ABS_Z, SMB380_MIN_VALUE,
+			SMB380_MAX_VALUE, 0, 0);
+
+	input_set_drvdata(idev, sensor);
+
+	ret = input_register_device(idev);
+	if (ret) {
+		dev_err(&client->dev, "registering input device is failed\n");
+		goto failed_reg;
+	}
+
+	if (client->irq > 0) {
+		ret = request_irq(client->irq, smb380_irq, IRQF_TRIGGER_RISING,
+				"smb380 accelerometer", sensor);
+		if (ret) {
+			dev_err(&client->dev, "can't get IRQ %d, ret %d\n",
+					client->irq, ret);
+			goto failed_irq;
+		}
+	}
+
+	return 0;
+
+failed_irq:
+	input_unregister_device(idev);
+	idev = NULL;
+failed_reg:
+	if (idev)
+		input_free_device(idev);
+failed_alloc:
+	return ret;
+}
+
+static int __devinit smb380_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct smb380_sensor *sensor;
+	struct smb380_platform_data *pdata;
+	int ret;
+
+	sensor = kzalloc(sizeof(struct smb380_sensor), GFP_KERNEL);
+	if (!sensor) {
+		dev_err(&client->dev, "failed to allocate driver data\n");
+		return -ENOMEM;
+	}
+
+	pdata = client->dev.platform_data;
+
+	sensor->client = client;
+	i2c_set_clientdata(client, sensor);
+
+	ret = smb380_read_reg(client, SMB380_CHIP_ID_REG);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to detect device\n");
+		goto failed_free;
+	}
+	if (ret != SMB380_CHIP_ID) {
+		dev_err(&client->dev, "the chip id is missmatched\n");
+		goto failed_free;
+	}
+
+	INIT_WORK(&sensor->work, smb380_work);
+	mutex_init(&sensor->lock);
+
+	ret = sysfs_create_group(&client->dev.kobj, &smb380_group);
+	if (ret) {
+		dev_err(&client->dev, "creating attribute group is failed\n");
+		goto failed_free;
+	}
+
+	ret = smb380_register_input_device(sensor);
+	if (ret) {
+		dev_err(&client->dev, "registering input device is failed\n");
+		goto failed_remove_sysfs;
+	}
+
+	if (pdata) {
+		sensor->range = pdata->range;
+		sensor->bandwidth = pdata->bandwidth;
+		sensor->new_data_int = pdata->new_data_int;
+		sensor->hg_int = pdata->hg_int;
+		sensor->lg_int = pdata->lg_int;
+		sensor->hg_dur = pdata->hg_dur;
+		sensor->hg_thres = pdata->hg_thres;
+		sensor->hg_hyst = pdata->hg_hyst;
+		sensor->lg_dur = pdata->lg_dur;
+		sensor->lg_thres = pdata->lg_thres;
+		sensor->lg_hyst = pdata->lg_hyst;
+	} else {
+		sensor->range = SMB380_DEFAULT_RANGE;
+		sensor->bandwidth = SMB380_DEFAULT_BANDWIDTH;
+		sensor->new_data_int = SMB380_DEFAULT_NEW_DATA_INT;
+		sensor->hg_int = SMB380_DEFAULT_HG_INT;
+		sensor->lg_int = SMB380_DEFAULT_LG_INT;
+		sensor->hg_dur = SMB380_DEFAULT_HG_DURATION;
+		sensor->hg_thres = SMB380_DEFAULT_HG_THRESHOLD;
+		sensor->hg_hyst = SMB380_DEFAULT_HG_HYST;
+		sensor->lg_dur = SMB380_DEFAULT_LG_DURATION;
+		sensor->lg_thres = SMB380_DEFAULT_LG_THRESHOLD;
+		sensor->lg_hyst = SMB380_DEFAULT_LG_HYST;
+	}
+
+	smb380_initialize(sensor);
+
+	dev_info(&client->dev, "%s registered\n", id->name);
+	return 0;
+
+failed_remove_sysfs:
+	sysfs_remove_group(&client->dev.kobj, &smb380_group);
+failed_free:
+	kfree(sensor);
+	return ret;
+}
+
+static int __devexit smb380_remove(struct i2c_client *client)
+{
+	struct smb380_sensor *sensor = i2c_get_clientdata(client);
+
+	smb380_unregister_input_device(sensor);
+	sysfs_remove_group(&client->dev.kobj, &smb380_group);
+	kfree(sensor);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int smb380_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	smb380_set_sleep(client, 1);
+	return 0;
+}
+
+static int smb380_resume(struct i2c_client *client)
+{
+	smb380_set_sleep(client, 0);
+	return 0;
+}
+
+#else
+#define smb380_suspend NULL
+#define smb380_resume NULL
+#endif
+
+static const struct i2c_device_id smb380_ids[] = {
+	{ "smb380", 0 },
+	{ "bma023", 1 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, smb380_ids);
+
+static struct i2c_driver smb380_i2c_driver = {
+	.driver	= {
+		.name	= "smb380",
+	},
+	.probe		= smb380_probe,
+	.remove		= __devexit_p(smb380_remove),
+	.suspend	= smb380_suspend,
+	.resume		= smb380_resume,
+	.id_table	= smb380_ids,
+};
+
+static int __init smb380_init(void)
+{
+	return i2c_add_driver(&smb380_i2c_driver);
+}
+module_init(smb380_init);
+
+static void __exit smb380_exit(void)
+{
+	i2c_del_driver(&smb380_i2c_driver);
+}
+module_exit(smb380_exit);
+
+MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
+MODULE_DESCRIPTION("SMB380/BMA023 Tri-axis accelerometer driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/smb380.h b/include/linux/smb380.h
new file mode 100644
index 0000000..e93c52d
--- /dev/null
+++ b/include/linux/smb380.h
@@ -0,0 +1,47 @@
+/*
+ * smb380.h - SMB380 Tri-axis accelerometer driver
+ *
+ * Copyright (c) 2010 Samsung Eletronics
+ * Kyungmin Park <kyungmin.park@samsung.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.
+ *
+ */
+
+#ifndef _SMB380_H_
+#define _SMB380_H_
+
+enum scale_range {
+	RANGE_2G,
+	RANGE_4G,
+	RANGE_8G,
+};
+
+/* Used to setup the digital filtering bandwitdh of ADC output */
+enum filter_bw {
+	BW_25HZ,
+	BW_50HZ,
+	BW_100HZ,
+	BW_190HZ,
+	BW_375HZ,
+	BW_750HZ,
+	BW_1500HZ,
+};
+
+struct smb380_platform_data {
+	enum scale_range range;
+	enum filter_bw bandwidth;
+	u8 new_data_int;
+	u8 hg_int;
+	u8 lg_int;
+	u8 lg_dur;
+	u8 lg_thres;
+	u8 lg_hyst;
+	u8 hg_dur;
+	u8 hg_thres;
+	u8 hg_hyst;
+};
+
+#endif /* _SMB380_H_ */
-- 
1.6.3.3