Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

21 files changed, 3504 insertions, 0 deletions

diff --git a/kernel/drivers/iio/common/Kconfig b/kernel/drivers/iio/common/Kconfig
new file mode 100644
index 000000000..790f106d7
--- /dev/null
+++ b/kernel/drivers/iio/common/Kconfig
@@ -0,0 +1,7 @@
+#
+# IIO common modules
+#
+
+source "drivers/iio/common/hid-sensors/Kconfig"
+source "drivers/iio/common/ssp_sensors/Kconfig"
+source "drivers/iio/common/st_sensors/Kconfig"
diff --git a/kernel/drivers/iio/common/Makefile b/kernel/drivers/iio/common/Makefile
new file mode 100644
index 000000000..b1e4d9c95
--- /dev/null
+++ b/kernel/drivers/iio/common/Makefile
@@ -0,0 +1,12 @@
+#
+# Makefile for the IIO common modules.
+# Common modules contains modules, which can be shared among multiple
+# IIO modules. For example if the trigger processing is common for
+# multiple IIO modules then this can be moved to a common module
+# instead of duplicating in each module.
+#
+
+# When adding new entries keep the list in alphabetical order
+obj-y += hid-sensors/
+obj-y += ssp_sensors/
+obj-y += st_sensors/
diff --git a/kernel/drivers/iio/common/hid-sensors/Kconfig b/kernel/drivers/iio/common/hid-sensors/Kconfig
new file mode 100644
index 000000000..39188b72c
--- /dev/null
+++ b/kernel/drivers/iio/common/hid-sensors/Kconfig
@@ -0,0 +1,28 @@
+#
+# Hid Sensor common modules
+#
+menu "Hid Sensor IIO Common"
+
+config HID_SENSOR_IIO_COMMON
+	tristate "Common modules for all HID Sensor IIO drivers"
+	depends on HID_SENSOR_HUB
+	select HID_SENSOR_IIO_TRIGGER if IIO_BUFFER
+	help
+	  Say yes here to build support for HID sensor to use
+	  HID sensor common processing for attributes and IIO triggers.
+	  There are many attributes which can be shared among multiple
+	  HID sensor drivers, this module contains processing for those
+	  attributes.
+
+config HID_SENSOR_IIO_TRIGGER
+	tristate "Common module (trigger) for all HID Sensor IIO drivers"
+	depends on HID_SENSOR_HUB && HID_SENSOR_IIO_COMMON
+	select IIO_TRIGGER
+	help
+	  Say yes here to build trigger support for HID sensors.
+	  Triggers will be send if all requested attributes were read.
+
+	  If this driver is compiled as a module, it will be named
+	  hid-sensor-trigger.
+
+endmenu
diff --git a/kernel/drivers/iio/common/hid-sensors/Makefile b/kernel/drivers/iio/common/hid-sensors/Makefile
new file mode 100644
index 000000000..22e7c5a82
--- /dev/null
+++ b/kernel/drivers/iio/common/hid-sensors/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the Hid sensor common modules.
+#
+
+obj-$(CONFIG_HID_SENSOR_IIO_COMMON) += hid-sensor-iio-common.o
+obj-$(CONFIG_HID_SENSOR_IIO_TRIGGER) += hid-sensor-trigger.o
+hid-sensor-iio-common-y := hid-sensor-attributes.o
diff --git a/kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
new file mode 100644
index 000000000..e81f43476
--- /dev/null
+++ b/kernel/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -0,0 +1,397 @@
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/hid-sensor-hub.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+static struct {
+	u32 usage_id;
+	int unit; /* 0 for default others from HID sensor spec */
+	int scale_val0; /* scale, whole number */
+	int scale_val1; /* scale, fraction in micros */
+} unit_conversion[] = {
+	{HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650},
+	{HID_USAGE_SENSOR_ACCEL_3D,
+		HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},
+	{HID_USAGE_SENSOR_ACCEL_3D,
+		HID_USAGE_SENSOR_UNITS_G, 9, 806650},
+
+	{HID_USAGE_SENSOR_GYRO_3D, 0, 0, 17453},
+	{HID_USAGE_SENSOR_GYRO_3D,
+		HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND, 1, 0},
+	{HID_USAGE_SENSOR_GYRO_3D,
+		HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND, 0, 17453},
+
+	{HID_USAGE_SENSOR_COMPASS_3D, 0, 0, 1000},
+	{HID_USAGE_SENSOR_COMPASS_3D, HID_USAGE_SENSOR_UNITS_GAUSS, 1, 0},
+
+	{HID_USAGE_SENSOR_INCLINOMETER_3D, 0, 0, 17453},
+	{HID_USAGE_SENSOR_INCLINOMETER_3D,
+		HID_USAGE_SENSOR_UNITS_DEGREES, 0, 17453},
+	{HID_USAGE_SENSOR_INCLINOMETER_3D,
+		HID_USAGE_SENSOR_UNITS_RADIANS, 1, 0},
+
+	{HID_USAGE_SENSOR_ALS, 0, 1, 0},
+	{HID_USAGE_SENSOR_ALS, HID_USAGE_SENSOR_UNITS_LUX, 1, 0},
+
+	{HID_USAGE_SENSOR_PRESSURE, 0, 100000, 0},
+	{HID_USAGE_SENSOR_PRESSURE, HID_USAGE_SENSOR_UNITS_PASCAL, 1, 0},
+};
+
+static int pow_10(unsigned power)
+{
+	int i;
+	int ret = 1;
+	for (i = 0; i < power; ++i)
+		ret = ret * 10;
+
+	return ret;
+}
+
+static void simple_div(int dividend, int divisor, int *whole,
+				int *micro_frac)
+{
+	int rem;
+	int exp = 0;
+
+	*micro_frac = 0;
+	if (divisor == 0) {
+		*whole = 0;
+		return;
+	}
+	*whole = dividend/divisor;
+	rem = dividend % divisor;
+	if (rem) {
+		while (rem <= divisor) {
+			rem *= 10;
+			exp++;
+		}
+		*micro_frac = (rem / divisor) * pow_10(6-exp);
+	}
+}
+
+static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
+{
+	*val1 = no/pow_10(exp);
+	*val2 = no%pow_10(exp) * pow_10(6-exp);
+}
+
+/*
+VTF format uses exponent and variable size format.
+For example if the size is 2 bytes
+0x0067 with VTF16E14 format -> +1.03
+To convert just change to 0x67 to decimal and use two decimal as E14 stands
+for 10^-2.
+Negative numbers are 2's complement
+*/
+static void convert_from_vtf_format(u32 value, int size, int exp,
+					int *val1, int *val2)
+{
+	int sign = 1;
+
+	if (value & BIT(size*8 - 1)) {
+		value =  ((1LL << (size * 8)) - value);
+		sign = -1;
+	}
+	exp = hid_sensor_convert_exponent(exp);
+	if (exp >= 0) {
+		*val1 = sign * value * pow_10(exp);
+		*val2 = 0;
+	} else {
+		split_micro_fraction(value, -exp, val1, val2);
+		if (*val1)
+			*val1 = sign * (*val1);
+		else
+			*val2 = sign * (*val2);
+	}
+}
+
+static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
+{
+	u32 value;
+	int sign = 1;
+
+	if (val1 < 0 || val2 < 0)
+		sign = -1;
+	exp = hid_sensor_convert_exponent(exp);
+	if (exp < 0) {
+		value = abs(val1) * pow_10(-exp);
+		value += abs(val2) / pow_10(6+exp);
+	} else
+		value = abs(val1) / pow_10(exp);
+	if (sign < 0)
+		value =  ((1LL << (size * 8)) - value);
+
+	return value;
+}
+
+s32 hid_sensor_read_poll_value(struct hid_sensor_common *st)
+{
+	s32 value = 0;
+	int ret;
+
+	ret = sensor_hub_get_feature(st->hsdev,
+				     st->poll.report_id,
+				     st->poll.index, sizeof(value), &value);
+
+	if (ret < 0 || value < 0) {
+		return -EINVAL;
+	} else {
+		if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+			value = value * 1000;
+	}
+
+	return value;
+}
+EXPORT_SYMBOL(hid_sensor_read_poll_value);
+
+int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
+				int *val1, int *val2)
+{
+	s32 value;
+	int ret;
+
+	ret = sensor_hub_get_feature(st->hsdev,
+				     st->poll.report_id,
+				     st->poll.index, sizeof(value), &value);
+	if (ret < 0 || value < 0) {
+		*val1 = *val2 = 0;
+		return -EINVAL;
+	} else {
+		if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
+			simple_div(1000, value, val1, val2);
+		else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+			simple_div(1, value, val1, val2);
+		else {
+			*val1 = *val2 = 0;
+			return -EINVAL;
+		}
+	}
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL(hid_sensor_read_samp_freq_value);
+
+int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
+				int val1, int val2)
+{
+	s32 value;
+	int ret;
+
+	if (val1 < 0 || val2 < 0)
+		ret = -EINVAL;
+
+	value = val1 * pow_10(6) + val2;
+	if (value) {
+		if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
+			value = pow_10(9)/value;
+		else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+			value = pow_10(6)/value;
+		else
+			value = 0;
+	}
+	ret = sensor_hub_set_feature(st->hsdev, st->poll.report_id,
+				     st->poll.index, sizeof(value), &value);
+	if (ret < 0 || value < 0)
+		ret = -EINVAL;
+
+	return ret;
+}
+EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
+
+int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
+				int *val1, int *val2)
+{
+	s32 value;
+	int ret;
+
+	ret = sensor_hub_get_feature(st->hsdev,
+				     st->sensitivity.report_id,
+				     st->sensitivity.index, sizeof(value),
+				     &value);
+	if (ret < 0 || value < 0) {
+		*val1 = *val2 = 0;
+		return -EINVAL;
+	} else {
+		convert_from_vtf_format(value, st->sensitivity.size,
+					st->sensitivity.unit_expo,
+					val1, val2);
+	}
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL(hid_sensor_read_raw_hyst_value);
+
+int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
+					int val1, int val2)
+{
+	s32 value;
+	int ret;
+
+	value = convert_to_vtf_format(st->sensitivity.size,
+				st->sensitivity.unit_expo,
+				val1, val2);
+	ret = sensor_hub_set_feature(st->hsdev, st->sensitivity.report_id,
+				     st->sensitivity.index, sizeof(value),
+				     &value);
+	if (ret < 0 || value < 0)
+		ret = -EINVAL;
+
+	return ret;
+}
+EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
+
+/*
+ * This fuction applies the unit exponent to the scale.
+ * For example:
+ * 9.806650 ->exp:2-> val0[980]val1[665000]
+ * 9.000806 ->exp:2-> val0[900]val1[80600]
+ * 0.174535 ->exp:2-> val0[17]val1[453500]
+ * 1.001745 ->exp:0-> val0[1]val1[1745]
+ * 1.001745 ->exp:2-> val0[100]val1[174500]
+ * 1.001745 ->exp:4-> val0[10017]val1[450000]
+ * 9.806650 ->exp:-2-> val0[0]val1[98066]
+ */
+static void adjust_exponent_micro(int *val0, int *val1, int scale0,
+				  int scale1, int exp)
+{
+	int i;
+	int x;
+	int res;
+	int rem;
+
+	if (exp > 0) {
+		*val0 = scale0 * pow_10(exp);
+		res = 0;
+		if (exp > 6) {
+			*val1 = 0;
+			return;
+		}
+		for (i = 0; i < exp; ++i) {
+			x = scale1 / pow_10(5 - i);
+			res += (pow_10(exp - 1 - i) * x);
+			scale1 = scale1 % pow_10(5 - i);
+		}
+		*val0 += res;
+			*val1 = scale1 * pow_10(exp);
+	} else if (exp < 0) {
+		exp = abs(exp);
+		if (exp > 6) {
+			*val0 = *val1 = 0;
+			return;
+		}
+		*val0 = scale0 / pow_10(exp);
+		rem = scale0 % pow_10(exp);
+		res = 0;
+		for (i = 0; i < (6 - exp); ++i) {
+			x = scale1 / pow_10(5 - i);
+			res += (pow_10(5 - exp - i) * x);
+			scale1 = scale1 % pow_10(5 - i);
+		}
+		*val1 = rem * pow_10(6 - exp) + res;
+	} else {
+		*val0 = scale0;
+		*val1 = scale1;
+	}
+}
+
+int hid_sensor_format_scale(u32 usage_id,
+			struct hid_sensor_hub_attribute_info *attr_info,
+			int *val0, int *val1)
+{
+	int i;
+	int exp;
+
+	*val0 = 1;
+	*val1 = 0;
+
+	for (i = 0; i < ARRAY_SIZE(unit_conversion); ++i) {
+		if (unit_conversion[i].usage_id == usage_id &&
+			unit_conversion[i].unit == attr_info->units) {
+			exp  = hid_sensor_convert_exponent(
+						attr_info->unit_expo);
+			adjust_exponent_micro(val0, val1,
+					unit_conversion[i].scale_val0,
+					unit_conversion[i].scale_val1, exp);
+			break;
+		}
+	}
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL(hid_sensor_format_scale);
+
+static
+int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
+					u32 usage_id,
+					struct hid_sensor_common *st)
+{
+	sensor_hub_input_get_attribute_info(hsdev,
+					HID_FEATURE_REPORT, usage_id,
+					HID_USAGE_SENSOR_PROP_REPORT_INTERVAL,
+					&st->poll);
+	/* Default unit of measure is milliseconds */
+	if (st->poll.units == 0)
+		st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
+	return 0;
+
+}
+
+int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
+					u32 usage_id,
+					struct hid_sensor_common *st)
+{
+
+
+	hid_sensor_get_reporting_interval(hsdev, usage_id, st);
+
+	sensor_hub_input_get_attribute_info(hsdev,
+					HID_FEATURE_REPORT, usage_id,
+					HID_USAGE_SENSOR_PROP_REPORT_STATE,
+					&st->report_state);
+
+	sensor_hub_input_get_attribute_info(hsdev,
+					HID_FEATURE_REPORT, usage_id,
+					HID_USAGE_SENSOR_PROY_POWER_STATE,
+					&st->power_state);
+
+	sensor_hub_input_get_attribute_info(hsdev,
+			HID_FEATURE_REPORT, usage_id,
+			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
+			 &st->sensitivity);
+
+	hid_dbg(hsdev->hdev, "common attributes: %x:%x, %x:%x, %x:%x %x:%x\n",
+			st->poll.index, st->poll.report_id,
+			st->report_state.index, st->report_state.report_id,
+			st->power_state.index, st->power_state.report_id,
+			st->sensitivity.index, st->sensitivity.report_id);
+
+	return 0;
+}
+EXPORT_SYMBOL(hid_sensor_parse_common_attributes);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
+MODULE_DESCRIPTION("HID Sensor common attribute processing");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/kernel/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
new file mode 100644
index 000000000..610fc98f8
--- /dev/null
+++ b/kernel/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -0,0 +1,211 @@
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/hid-sensor-hub.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/sysfs.h>
+#include "hid-sensor-trigger.h"
+
+static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
+{
+	int state_val;
+	int report_val;
+	s32 poll_value = 0;
+
+	if (state) {
+		if (sensor_hub_device_open(st->hsdev))
+			return -EIO;
+
+		atomic_inc(&st->data_ready);
+
+		state_val = hid_sensor_get_usage_index(st->hsdev,
+			st->power_state.report_id,
+			st->power_state.index,
+			HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
+		report_val = hid_sensor_get_usage_index(st->hsdev,
+			st->report_state.report_id,
+			st->report_state.index,
+			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
+
+		poll_value = hid_sensor_read_poll_value(st);
+	} else {
+		if (!atomic_dec_and_test(&st->data_ready))
+			return 0;
+		sensor_hub_device_close(st->hsdev);
+		state_val = hid_sensor_get_usage_index(st->hsdev,
+			st->power_state.report_id,
+			st->power_state.index,
+			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
+		report_val = hid_sensor_get_usage_index(st->hsdev,
+			st->report_state.report_id,
+			st->report_state.index,
+			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
+	}
+
+	if (state_val >= 0) {
+		state_val += st->power_state.logical_minimum;
+		sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
+				       st->power_state.index, sizeof(state_val),
+				       &state_val);
+	}
+
+	if (report_val >= 0) {
+		report_val += st->report_state.logical_minimum;
+		sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
+				       st->report_state.index,
+				       sizeof(report_val),
+				       &report_val);
+	}
+
+	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
+			       st->power_state.index,
+			       sizeof(state_val), &state_val);
+	if (state && poll_value)
+		msleep_interruptible(poll_value * 2);
+
+	return 0;
+}
+EXPORT_SYMBOL(hid_sensor_power_state);
+
+int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
+{
+#ifdef CONFIG_PM
+	int ret;
+
+	if (state)
+		ret = pm_runtime_get_sync(&st->pdev->dev);
+	else {
+		pm_runtime_mark_last_busy(&st->pdev->dev);
+		ret = pm_runtime_put_autosuspend(&st->pdev->dev);
+	}
+	if (ret < 0) {
+		if (state)
+			pm_runtime_put_noidle(&st->pdev->dev);
+		return ret;
+	}
+
+ 	return 0;
+#else
+	return _hid_sensor_power_state(st, state);
+#endif
+}
+
+static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
+						bool state)
+{
+	return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
+}
+
+void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
+{
+	iio_trigger_unregister(attrb->trigger);
+	iio_trigger_free(attrb->trigger);
+}
+EXPORT_SYMBOL(hid_sensor_remove_trigger);
+
+static const struct iio_trigger_ops hid_sensor_trigger_ops = {
+	.owner = THIS_MODULE,
+	.set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
+};
+
+int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+				struct hid_sensor_common *attrb)
+{
+	int ret;
+	struct iio_trigger *trig;
+
+	trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
+	if (trig == NULL) {
+		dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+
+	trig->dev.parent = indio_dev->dev.parent;
+	iio_trigger_set_drvdata(trig, attrb);
+	trig->ops = &hid_sensor_trigger_ops;
+	ret = iio_trigger_register(trig);
+
+	if (ret) {
+		dev_err(&indio_dev->dev, "Trigger Register Failed\n");
+		goto error_free_trig;
+	}
+	attrb->trigger = trig;
+	indio_dev->trig = iio_trigger_get(trig);
+
+	ret = pm_runtime_set_active(&indio_dev->dev);
+	if (ret)
+		goto error_unreg_trigger;
+
+	iio_device_set_drvdata(indio_dev, attrb);
+	pm_suspend_ignore_children(&attrb->pdev->dev, true);
+	pm_runtime_enable(&attrb->pdev->dev);
+	/* Default to 3 seconds, but can be changed from sysfs */
+	pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
+					 3000);
+	pm_runtime_use_autosuspend(&attrb->pdev->dev);
+
+	return ret;
+error_unreg_trigger:
+	iio_trigger_unregister(trig);
+error_free_trig:
+	iio_trigger_free(trig);
+error_ret:
+	return ret;
+}
+EXPORT_SYMBOL(hid_sensor_setup_trigger);
+
+#ifdef CONFIG_PM
+static int hid_sensor_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+
+	return _hid_sensor_power_state(attrb, false);
+}
+
+static int hid_sensor_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
+
+	return _hid_sensor_power_state(attrb, true);
+}
+
+#endif
+
+const struct dev_pm_ops hid_sensor_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
+	SET_RUNTIME_PM_OPS(hid_sensor_suspend,
+			   hid_sensor_resume, NULL)
+};
+EXPORT_SYMBOL(hid_sensor_pm_ops);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
+MODULE_DESCRIPTION("HID Sensor trigger processing");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/iio/common/hid-sensors/hid-sensor-trigger.h b/kernel/drivers/iio/common/hid-sensors/hid-sensor-trigger.h
new file mode 100644
index 000000000..9f4713f42
--- /dev/null
+++ b/kernel/drivers/iio/common/hid-sensors/hid-sensor-trigger.h
@@ -0,0 +1,32 @@
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef _HID_SENSOR_TRIGGER_H
+#define _HID_SENSOR_TRIGGER_H
+
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+
+extern const struct dev_pm_ops hid_sensor_pm_ops;
+
+int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+				struct hid_sensor_common *attrb);
+void hid_sensor_remove_trigger(struct hid_sensor_common *attrb);
+int hid_sensor_power_state(struct hid_sensor_common *st, bool state);
+
+#endif
diff --git a/kernel/drivers/iio/common/ssp_sensors/Kconfig b/kernel/drivers/iio/common/ssp_sensors/Kconfig
new file mode 100644
index 000000000..0ea4faf01
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/Kconfig
@@ -0,0 +1,26 @@
+#
+# SSP sensor drivers and commons configuration
+#
+menu "SSP Sensor Common"
+
+config IIO_SSP_SENSORS_COMMONS
+	tristate "Commons for all SSP Sensor IIO drivers"
+	depends on IIO_SSP_SENSORHUB
+	select IIO_BUFFER
+	select IIO_KFIFO_BUF
+	help
+	  Say yes here to build commons for SSP sensors.
+	  To compile this as a module, choose M here: the module
+	  will be called ssp_iio.
+
+config IIO_SSP_SENSORHUB
+	tristate "Samsung Sensorhub driver"
+	depends on SPI
+	select MFD_CORE
+	help
+	  SSP driver for sensorhub.
+	  If you say yes here you get ssp support for sensorhub.
+	  To compile this driver as a module, choose M here: the
+	  module will be called sensorhub.
+
+endmenu
diff --git a/kernel/drivers/iio/common/ssp_sensors/Makefile b/kernel/drivers/iio/common/ssp_sensors/Makefile
new file mode 100644
index 000000000..1e0389eb0
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for SSP sensor drivers and commons.
+#
+
+sensorhub-objs				:= ssp_dev.o ssp_spi.o
+obj-$(CONFIG_IIO_SSP_SENSORHUB)		+= sensorhub.o
+
+obj-$(CONFIG_IIO_SSP_SENSORS_COMMONS) 	+= ssp_iio.o
diff --git a/kernel/drivers/iio/common/ssp_sensors/ssp.h b/kernel/drivers/iio/common/ssp_sensors/ssp.h
new file mode 100644
index 000000000..b910e91d7
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/ssp.h
@@ -0,0 +1,257 @@
+/*
+ *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ *  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.
+ *
+ *  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.
+ *
+ */
+
+#ifndef __SSP_SENSORHUB_H__
+#define __SSP_SENSORHUB_H__
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/iio.h>
+#include <linux/spi/spi.h>
+
+#define SSP_DEVICE_ID		0x55
+
+#ifdef SSP_DBG
+#define ssp_dbg(format, ...) pr_info("[SSP] "format, ##__VA_ARGS__)
+#else
+#define ssp_dbg(format, ...)
+#endif
+
+#define SSP_SW_RESET_TIME		3000
+/* Sensor polling in ms */
+#define SSP_DEFAULT_POLLING_DELAY	200
+#define SSP_DEFAULT_RETRIES		3
+#define SSP_DATA_PACKET_SIZE		960
+#define SSP_HEADER_BUFFER_SIZE		4
+
+enum {
+	SSP_KERNEL_BINARY = 0,
+	SSP_KERNEL_CRASHED_BINARY,
+};
+
+enum {
+	SSP_INITIALIZATION_STATE = 0,
+	SSP_NO_SENSOR_STATE,
+	SSP_ADD_SENSOR_STATE,
+	SSP_RUNNING_SENSOR_STATE,
+};
+
+/* Firmware download STATE */
+enum {
+	SSP_FW_DL_STATE_FAIL = -1,
+	SSP_FW_DL_STATE_NONE = 0,
+	SSP_FW_DL_STATE_NEED_TO_SCHEDULE,
+	SSP_FW_DL_STATE_SCHEDULED,
+	SSP_FW_DL_STATE_DOWNLOADING,
+	SSP_FW_DL_STATE_SYNC,
+	SSP_FW_DL_STATE_DONE,
+};
+
+#define SSP_INVALID_REVISION			99999
+#define SSP_INVALID_REVISION2			0xffffff
+
+/* AP -> SSP Instruction */
+#define SSP_MSG2SSP_INST_BYPASS_SENSOR_ADD	0xa1
+#define SSP_MSG2SSP_INST_BYPASS_SENSOR_RM	0xa2
+#define SSP_MSG2SSP_INST_REMOVE_ALL		0xa3
+#define SSP_MSG2SSP_INST_CHANGE_DELAY		0xa4
+#define SSP_MSG2SSP_INST_LIBRARY_ADD		0xb1
+#define SSP_MSG2SSP_INST_LIBRARY_REMOVE		0xb2
+#define SSP_MSG2SSP_INST_LIB_NOTI		0xb4
+#define SSP_MSG2SSP_INST_LIB_DATA		0xc1
+
+#define SSP_MSG2SSP_AP_MCU_SET_GYRO_CAL		0xcd
+#define SSP_MSG2SSP_AP_MCU_SET_ACCEL_CAL	0xce
+#define SSP_MSG2SSP_AP_STATUS_SHUTDOWN		0xd0
+#define SSP_MSG2SSP_AP_STATUS_WAKEUP		0xd1
+#define SSP_MSG2SSP_AP_STATUS_SLEEP		0xd2
+#define SSP_MSG2SSP_AP_STATUS_RESUME		0xd3
+#define SSP_MSG2SSP_AP_STATUS_SUSPEND		0xd4
+#define SSP_MSG2SSP_AP_STATUS_RESET		0xd5
+#define SSP_MSG2SSP_AP_STATUS_POW_CONNECTED	0xd6
+#define SSP_MSG2SSP_AP_STATUS_POW_DISCONNECTED	0xd7
+#define SSP_MSG2SSP_AP_TEMPHUMIDITY_CAL_DONE	0xda
+#define SSP_MSG2SSP_AP_MCU_SET_DUMPMODE		0xdb
+#define SSP_MSG2SSP_AP_MCU_DUMP_CHECK		0xdc
+#define SSP_MSG2SSP_AP_MCU_BATCH_FLUSH		0xdd
+#define SSP_MSG2SSP_AP_MCU_BATCH_COUNT		0xdf
+
+#define SSP_MSG2SSP_AP_WHOAMI				0x0f
+#define SSP_MSG2SSP_AP_FIRMWARE_REV			0xf0
+#define SSP_MSG2SSP_AP_SENSOR_FORMATION			0xf1
+#define SSP_MSG2SSP_AP_SENSOR_PROXTHRESHOLD		0xf2
+#define SSP_MSG2SSP_AP_SENSOR_BARCODE_EMUL		0xf3
+#define SSP_MSG2SSP_AP_SENSOR_SCANNING			0xf4
+#define SSP_MSG2SSP_AP_SET_MAGNETIC_HWOFFSET		0xf5
+#define SSP_MSG2SSP_AP_GET_MAGNETIC_HWOFFSET		0xf6
+#define SSP_MSG2SSP_AP_SENSOR_GESTURE_CURRENT		0xf7
+#define SSP_MSG2SSP_AP_GET_THERM			0xf8
+#define SSP_MSG2SSP_AP_GET_BIG_DATA			0xf9
+#define SSP_MSG2SSP_AP_SET_BIG_DATA			0xfa
+#define SSP_MSG2SSP_AP_START_BIG_DATA			0xfb
+#define SSP_MSG2SSP_AP_SET_MAGNETIC_STATIC_MATRIX	0xfd
+#define SSP_MSG2SSP_AP_SENSOR_TILT			0xea
+#define SSP_MSG2SSP_AP_MCU_SET_TIME			0xfe
+#define SSP_MSG2SSP_AP_MCU_GET_TIME			0xff
+
+#define SSP_MSG2SSP_AP_FUSEROM				0x01
+
+/* voice data */
+#define SSP_TYPE_WAKE_UP_VOICE_SERVICE			0x01
+#define SSP_TYPE_WAKE_UP_VOICE_SOUND_SOURCE_AM		0x01
+#define SSP_TYPE_WAKE_UP_VOICE_SOUND_SOURCE_GRAMMER	0x02
+
+/* Factory Test */
+#define SSP_ACCELEROMETER_FACTORY			0x80
+#define SSP_GYROSCOPE_FACTORY				0x81
+#define SSP_GEOMAGNETIC_FACTORY				0x82
+#define SSP_PRESSURE_FACTORY				0x85
+#define SSP_GESTURE_FACTORY				0x86
+#define SSP_TEMPHUMIDITY_CRC_FACTORY			0x88
+#define SSP_GYROSCOPE_TEMP_FACTORY			0x8a
+#define SSP_GYROSCOPE_DPS_FACTORY			0x8b
+#define SSP_MCU_FACTORY					0x8c
+#define SSP_MCU_SLEEP_FACTORY				0x8d
+
+/* SSP -> AP ACK about write CMD */
+#define SSP_MSG_ACK		0x80	/* ACK from SSP to AP */
+#define SSP_MSG_NAK		0x70	/* NAK from SSP to AP */
+
+struct ssp_sensorhub_info {
+	char *fw_name;
+	char *fw_crashed_name;
+	unsigned int fw_rev;
+	const u8 * const mag_table;
+	const unsigned int mag_length;
+};
+
+/* ssp_msg options bit */
+#define SSP_RW		0
+#define SSP_INDEX	3
+
+#define SSP_AP2HUB_READ		0
+#define SSP_AP2HUB_WRITE	1
+#define SSP_HUB2AP_WRITE	2
+#define SSP_AP2HUB_READY	3
+#define SSP_AP2HUB_RETURN	4
+
+/**
+ * struct ssp_data - ssp platformdata structure
+ * @spi:		spi device
+ * @sensorhub_info:	info about sensorhub board specific features
+ * @wdt_timer:		watchdog timer
+ * @work_wdt:		watchdog work
+ * @work_firmware:	firmware upgrade work queue
+ * @work_refresh:	refresh work queue for reset request from MCU
+ * @shut_down:		shut down flag
+ * @mcu_dump_mode:	mcu dump mode for debug
+ * @time_syncing:	time syncing indication flag
+ * @timestamp:		previous time in ns calculated for time syncing
+ * @check_status:	status table for each sensor
+ * @com_fail_cnt:	communication fail count
+ * @reset_cnt:		reset count
+ * @timeout_cnt:	timeout count
+ * @available_sensors:	available sensors seen by sensorhub (bit array)
+ * @cur_firm_rev:	cached current firmware revision
+ * @last_resume_state:	last AP resume/suspend state used to handle the PM
+ *                      state of ssp
+ * @last_ap_state:	(obsolete) sleep notification for MCU
+ * @sensor_enable:	sensor enable mask
+ * @delay_buf:		data acquisition intervals table
+ * @batch_latency_buf:	yet unknown but existing in communication protocol
+ * @batch_opt_buf:	yet unknown but existing in communication protocol
+ * @accel_position:	yet unknown but existing in communication protocol
+ * @mag_position:	yet unknown but existing in communication protocol
+ * @fw_dl_state:	firmware download state
+ * @comm_lock:		lock protecting the handshake
+ * @pending_lock:	lock protecting pending list and completion
+ * @mcu_reset_gpio:	mcu reset line
+ * @ap_mcu_gpio:	ap to mcu gpio line
+ * @mcu_ap_gpio:	mcu to ap gpio line
+ * @pending_list:	pending list for messages queued to be sent/read
+ * @sensor_devs:	registered IIO devices table
+ * @enable_refcount:	enable reference count for wdt (watchdog timer)
+ * @header_buffer:	cache aligned buffer for packet header
+ */
+struct ssp_data {
+	struct spi_device *spi;
+	struct ssp_sensorhub_info *sensorhub_info;
+	struct timer_list wdt_timer;
+	struct work_struct work_wdt;
+	struct delayed_work work_refresh;
+
+	bool shut_down;
+	bool mcu_dump_mode;
+	bool time_syncing;
+	int64_t timestamp;
+
+	int check_status[SSP_SENSOR_MAX];
+
+	unsigned int com_fail_cnt;
+	unsigned int reset_cnt;
+	unsigned int timeout_cnt;
+
+	unsigned int available_sensors;
+	unsigned int cur_firm_rev;
+
+	char last_resume_state;
+	char last_ap_state;
+
+	unsigned int sensor_enable;
+	u32 delay_buf[SSP_SENSOR_MAX];
+	s32 batch_latency_buf[SSP_SENSOR_MAX];
+	s8 batch_opt_buf[SSP_SENSOR_MAX];
+
+	int accel_position;
+	int mag_position;
+	int fw_dl_state;
+
+	struct mutex comm_lock;
+	struct mutex pending_lock;
+
+	int mcu_reset_gpio;
+	int ap_mcu_gpio;
+	int mcu_ap_gpio;
+
+	struct list_head pending_list;
+
+	struct iio_dev *sensor_devs[SSP_SENSOR_MAX];
+	atomic_t enable_refcount;
+
+	__le16 header_buffer[SSP_HEADER_BUFFER_SIZE / sizeof(__le16)]
+		____cacheline_aligned;
+};
+
+void ssp_clean_pending_list(struct ssp_data *data);
+
+int ssp_command(struct ssp_data *data, char command, int arg);
+
+int ssp_send_instruction(struct ssp_data *data, u8 inst, u8 sensor_type,
+			 u8 *send_buf, u8 length);
+
+int ssp_irq_msg(struct ssp_data *data);
+
+int ssp_get_chipid(struct ssp_data *data);
+
+int ssp_set_magnetic_matrix(struct ssp_data *data);
+
+unsigned int ssp_get_sensor_scanning_info(struct ssp_data *data);
+
+unsigned int ssp_get_firmware_rev(struct ssp_data *data);
+
+int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay);
+
+#endif /* __SSP_SENSORHUB_H__ */
diff --git a/kernel/drivers/iio/common/ssp_sensors/ssp_dev.c b/kernel/drivers/iio/common/ssp_sensors/ssp_dev.c
new file mode 100644
index 000000000..9a40097e7
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/ssp_dev.c
@@ -0,0 +1,714 @@
+/*
+ *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ *  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.
+ *
+ *  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.
+ *
+ */
+
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include "ssp.h"
+
+#define SSP_WDT_TIME			10000
+#define SSP_LIMIT_RESET_CNT		20
+#define SSP_LIMIT_TIMEOUT_CNT		3
+
+/* It is possible that it is max clk rate for version 1.0 of bootcode */
+#define SSP_BOOT_SPI_HZ	400000
+
+/*
+ * These fields can look enigmatic but this structure is used mainly to flat
+ * some values and depends on command type.
+ */
+struct ssp_instruction {
+	__le32 a;
+	__le32 b;
+	u8 c;
+} __attribute__((__packed__));
+
+static const u8 ssp_magnitude_table[] = {110, 85, 171, 71, 203, 195, 0, 67,
+	208, 56, 175, 244, 206, 213, 0, 92, 250, 0, 55, 48, 189, 252, 171,
+	243, 13, 45, 250};
+
+static const struct ssp_sensorhub_info ssp_rinato_info = {
+	.fw_name = "ssp_B2.fw",
+	.fw_crashed_name = "ssp_crashed.fw",
+	.fw_rev = 14052300,
+	.mag_table = ssp_magnitude_table,
+	.mag_length = ARRAY_SIZE(ssp_magnitude_table),
+};
+
+static const struct ssp_sensorhub_info ssp_thermostat_info = {
+	.fw_name = "thermostat_B2.fw",
+	.fw_crashed_name = "ssp_crashed.fw",
+	.fw_rev = 14080600,
+	.mag_table = ssp_magnitude_table,
+	.mag_length = ARRAY_SIZE(ssp_magnitude_table),
+};
+
+static const struct mfd_cell sensorhub_sensor_devs[] = {
+	{
+		.name = "ssp-accelerometer",
+	},
+	{
+		.name = "ssp-gyroscope",
+	},
+};
+
+static void ssp_toggle_mcu_reset_gpio(struct ssp_data *data)
+{
+	gpio_set_value(data->mcu_reset_gpio, 0);
+	usleep_range(1000, 1200);
+	gpio_set_value(data->mcu_reset_gpio, 1);
+	msleep(50);
+}
+
+static void ssp_sync_available_sensors(struct ssp_data *data)
+{
+	int i, ret;
+
+	for (i = 0; i < SSP_SENSOR_MAX; ++i) {
+		if (data->available_sensors & BIT(i)) {
+			ret = ssp_enable_sensor(data, i, data->delay_buf[i]);
+			if (ret < 0) {
+				dev_err(&data->spi->dev,
+					"Sync sensor nr: %d fail\n", i);
+				continue;
+			}
+		}
+	}
+
+	ret = ssp_command(data, SSP_MSG2SSP_AP_MCU_SET_DUMPMODE,
+			  data->mcu_dump_mode);
+	if (ret < 0)
+		dev_err(&data->spi->dev,
+			"SSP_MSG2SSP_AP_MCU_SET_DUMPMODE failed\n");
+}
+
+static void ssp_enable_mcu(struct ssp_data *data, bool enable)
+{
+	dev_info(&data->spi->dev, "current shutdown = %d, old = %d\n", enable,
+		 data->shut_down);
+
+	if (enable && data->shut_down) {
+		data->shut_down = false;
+		enable_irq(data->spi->irq);
+		enable_irq_wake(data->spi->irq);
+	} else if (!enable && !data->shut_down) {
+		data->shut_down = true;
+		disable_irq(data->spi->irq);
+		disable_irq_wake(data->spi->irq);
+	} else {
+		dev_warn(&data->spi->dev, "current shutdown = %d, old = %d\n",
+			 enable, data->shut_down);
+	}
+}
+
+/*
+ * This function is the first one which communicates with the mcu so it is
+ * possible that the first attempt will fail
+ */
+static int ssp_check_fwbl(struct ssp_data *data)
+{
+	int retries = 0;
+
+	while (retries++ < 5) {
+		data->cur_firm_rev = ssp_get_firmware_rev(data);
+		if (data->cur_firm_rev == SSP_INVALID_REVISION ||
+		    data->cur_firm_rev == SSP_INVALID_REVISION2) {
+			dev_warn(&data->spi->dev,
+				 "Invalid revision, trying %d time\n", retries);
+		} else {
+			break;
+		}
+	}
+
+	if (data->cur_firm_rev == SSP_INVALID_REVISION ||
+	    data->cur_firm_rev == SSP_INVALID_REVISION2) {
+		dev_err(&data->spi->dev, "SSP_INVALID_REVISION\n");
+		return SSP_FW_DL_STATE_NEED_TO_SCHEDULE;
+	}
+
+	dev_info(&data->spi->dev,
+		 "MCU Firm Rev : Old = %8u, New = %8u\n",
+		 data->cur_firm_rev,
+		 data->sensorhub_info->fw_rev);
+
+	if (data->cur_firm_rev != data->sensorhub_info->fw_rev)
+		return SSP_FW_DL_STATE_NEED_TO_SCHEDULE;
+
+	return SSP_FW_DL_STATE_NONE;
+}
+
+static void ssp_reset_mcu(struct ssp_data *data)
+{
+	ssp_enable_mcu(data, false);
+	ssp_clean_pending_list(data);
+	ssp_toggle_mcu_reset_gpio(data);
+	ssp_enable_mcu(data, true);
+}
+
+static void ssp_wdt_work_func(struct work_struct *work)
+{
+	struct ssp_data *data = container_of(work, struct ssp_data, work_wdt);
+
+	dev_err(&data->spi->dev, "%s - Sensor state: 0x%x, RC: %u, CC: %u\n",
+		__func__, data->available_sensors, data->reset_cnt,
+		data->com_fail_cnt);
+
+	ssp_reset_mcu(data);
+	data->com_fail_cnt = 0;
+	data->timeout_cnt = 0;
+}
+
+static void ssp_wdt_timer_func(unsigned long ptr)
+{
+	struct ssp_data *data = (struct ssp_data *)ptr;
+
+	switch (data->fw_dl_state) {
+	case SSP_FW_DL_STATE_FAIL:
+	case SSP_FW_DL_STATE_DOWNLOADING:
+	case SSP_FW_DL_STATE_SYNC:
+		goto _mod;
+	}
+
+	if (data->timeout_cnt > SSP_LIMIT_TIMEOUT_CNT ||
+	    data->com_fail_cnt > SSP_LIMIT_RESET_CNT)
+		queue_work(system_power_efficient_wq, &data->work_wdt);
+_mod:
+	mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME));
+}
+
+static void ssp_enable_wdt_timer(struct ssp_data *data)
+{
+	mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME));
+}
+
+static void ssp_disable_wdt_timer(struct ssp_data *data)
+{
+	del_timer_sync(&data->wdt_timer);
+	cancel_work_sync(&data->work_wdt);
+}
+
+/**
+ * ssp_get_sensor_delay() - gets sensor data acquisition period
+ * @data:	sensorhub structure
+ * @type:	SSP sensor type
+ *
+ * Returns acquisition period in ms
+ */
+u32 ssp_get_sensor_delay(struct ssp_data *data, enum ssp_sensor_type type)
+{
+	return data->delay_buf[type];
+}
+EXPORT_SYMBOL(ssp_get_sensor_delay);
+
+/**
+ * ssp_enable_sensor() - enables data acquisition for sensor
+ * @data:	sensorhub structure
+ * @type:	SSP sensor type
+ * @delay:	delay in ms
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_enable_sensor(struct ssp_data *data, enum ssp_sensor_type type,
+		      u32 delay)
+{
+	int ret;
+	struct ssp_instruction to_send;
+
+	to_send.a = cpu_to_le32(delay);
+	to_send.b = cpu_to_le32(data->batch_latency_buf[type]);
+	to_send.c = data->batch_opt_buf[type];
+
+	switch (data->check_status[type]) {
+	case SSP_INITIALIZATION_STATE:
+		/* do calibration step, now just enable */
+	case SSP_ADD_SENSOR_STATE:
+		ret = ssp_send_instruction(data,
+					   SSP_MSG2SSP_INST_BYPASS_SENSOR_ADD,
+					   type,
+					   (u8 *)&to_send, sizeof(to_send));
+		if (ret < 0) {
+			dev_err(&data->spi->dev, "Enabling sensor failed\n");
+			data->check_status[type] = SSP_NO_SENSOR_STATE;
+			goto derror;
+		}
+
+		data->sensor_enable |= BIT(type);
+		data->check_status[type] = SSP_RUNNING_SENSOR_STATE;
+		break;
+	case SSP_RUNNING_SENSOR_STATE:
+		ret = ssp_send_instruction(data,
+					   SSP_MSG2SSP_INST_CHANGE_DELAY, type,
+					   (u8 *)&to_send, sizeof(to_send));
+		if (ret < 0) {
+			dev_err(&data->spi->dev,
+				"Changing sensor delay failed\n");
+			goto derror;
+		}
+		break;
+	default:
+		data->check_status[type] = SSP_ADD_SENSOR_STATE;
+		break;
+	}
+
+	data->delay_buf[type] = delay;
+
+	if (atomic_inc_return(&data->enable_refcount) == 1)
+		ssp_enable_wdt_timer(data);
+
+	return 0;
+
+derror:
+	return ret;
+}
+EXPORT_SYMBOL(ssp_enable_sensor);
+
+/**
+ * ssp_change_delay() - changes data acquisition for sensor
+ * @data:	sensorhub structure
+ * @type:	SSP sensor type
+ * @delay:	delay in ms
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_change_delay(struct ssp_data *data, enum ssp_sensor_type type,
+		     u32 delay)
+{
+	int ret;
+	struct ssp_instruction to_send;
+
+	to_send.a = cpu_to_le32(delay);
+	to_send.b = cpu_to_le32(data->batch_latency_buf[type]);
+	to_send.c = data->batch_opt_buf[type];
+
+	ret = ssp_send_instruction(data, SSP_MSG2SSP_INST_CHANGE_DELAY, type,
+				   (u8 *)&to_send, sizeof(to_send));
+	if (ret < 0) {
+		dev_err(&data->spi->dev, "Changing sensor delay failed\n");
+		return ret;
+	}
+
+	data->delay_buf[type] = delay;
+
+	return 0;
+}
+EXPORT_SYMBOL(ssp_change_delay);
+
+/**
+ * ssp_disable_sensor() - disables sensor
+ *
+ * @data:	sensorhub structure
+ * @type:	SSP sensor type
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_disable_sensor(struct ssp_data *data, enum ssp_sensor_type type)
+{
+	int ret;
+	__le32 command;
+
+	if (data->sensor_enable & BIT(type)) {
+		command = cpu_to_le32(data->delay_buf[type]);
+
+		ret = ssp_send_instruction(data,
+					   SSP_MSG2SSP_INST_BYPASS_SENSOR_RM,
+					   type, (u8 *)&command,
+					   sizeof(command));
+		if (ret < 0) {
+			dev_err(&data->spi->dev, "Remove sensor fail\n");
+			return ret;
+		}
+
+		data->sensor_enable &= ~BIT(type);
+	}
+
+	data->check_status[type] = SSP_ADD_SENSOR_STATE;
+
+	if (atomic_dec_and_test(&data->enable_refcount))
+		ssp_disable_wdt_timer(data);
+
+	return 0;
+}
+EXPORT_SYMBOL(ssp_disable_sensor);
+
+static irqreturn_t ssp_irq_thread_fn(int irq, void *dev_id)
+{
+	struct ssp_data *data = dev_id;
+
+	/*
+	 * This wrapper is done to preserve error path for ssp_irq_msg, also
+	 * it is defined in different file.
+	 */
+	ssp_irq_msg(data);
+
+	return IRQ_HANDLED;
+}
+
+static int ssp_initialize_mcu(struct ssp_data *data)
+{
+	int ret;
+
+	ssp_clean_pending_list(data);
+
+	ret = ssp_get_chipid(data);
+	if (ret != SSP_DEVICE_ID) {
+		dev_err(&data->spi->dev, "%s - MCU %s ret = %d\n", __func__,
+			ret < 0 ? "is not working" : "identification failed",
+			ret);
+		return ret < 0 ? ret : -ENODEV;
+	}
+
+	dev_info(&data->spi->dev, "MCU device ID = %d\n", ret);
+
+	/*
+	 * needs clarification, for now do not want to export all transfer
+	 * methods to sensors' drivers
+	 */
+	ret = ssp_set_magnetic_matrix(data);
+	if (ret < 0) {
+		dev_err(&data->spi->dev,
+			"%s - ssp_set_magnetic_matrix failed\n", __func__);
+		return ret;
+	}
+
+	data->available_sensors = ssp_get_sensor_scanning_info(data);
+	if (data->available_sensors == 0) {
+		dev_err(&data->spi->dev,
+			"%s - ssp_get_sensor_scanning_info failed\n", __func__);
+		return -EIO;
+	}
+
+	data->cur_firm_rev = ssp_get_firmware_rev(data);
+	dev_info(&data->spi->dev, "MCU Firm Rev : New = %8u\n",
+		 data->cur_firm_rev);
+
+	return ssp_command(data, SSP_MSG2SSP_AP_MCU_DUMP_CHECK, 0);
+}
+
+/*
+ * sensorhub can request its reinitialization as some brutal and rare error
+ * handling. It can be requested from the MCU.
+ */
+static void ssp_refresh_task(struct work_struct *work)
+{
+	struct ssp_data *data = container_of((struct delayed_work *)work,
+					     struct ssp_data, work_refresh);
+
+	dev_info(&data->spi->dev, "refreshing\n");
+
+	data->reset_cnt++;
+
+	if (ssp_initialize_mcu(data) >= 0) {
+		ssp_sync_available_sensors(data);
+		if (data->last_ap_state != 0)
+			ssp_command(data, data->last_ap_state, 0);
+
+		if (data->last_resume_state != 0)
+			ssp_command(data, data->last_resume_state, 0);
+
+		data->timeout_cnt = 0;
+		data->com_fail_cnt = 0;
+	}
+}
+
+int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay)
+{
+	cancel_delayed_work_sync(&data->work_refresh);
+
+	return queue_delayed_work(system_power_efficient_wq,
+				  &data->work_refresh,
+				  msecs_to_jiffies(delay));
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ssp_of_match[] = {
+	{
+		.compatible	= "samsung,sensorhub-rinato",
+		.data		= &ssp_rinato_info,
+	}, {
+		.compatible	= "samsung,sensorhub-thermostat",
+		.data		= &ssp_thermostat_info,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ssp_of_match);
+
+static struct ssp_data *ssp_parse_dt(struct device *dev)
+{
+	int ret;
+	struct ssp_data *data;
+	struct device_node *node = dev->of_node;
+	const struct of_device_id *match;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	data->mcu_ap_gpio = of_get_named_gpio(node, "mcu-ap-gpios", 0);
+	if (data->mcu_ap_gpio < 0)
+		goto err_free_pd;
+
+	data->ap_mcu_gpio = of_get_named_gpio(node, "ap-mcu-gpios", 0);
+	if (data->ap_mcu_gpio < 0)
+		goto err_free_pd;
+
+	data->mcu_reset_gpio = of_get_named_gpio(node, "mcu-reset-gpios", 0);
+	if (data->mcu_reset_gpio < 0)
+		goto err_free_pd;
+
+	ret = devm_gpio_request_one(dev, data->ap_mcu_gpio, GPIOF_OUT_INIT_HIGH,
+				    "ap-mcu-gpios");
+	if (ret)
+		goto err_free_pd;
+
+	ret = devm_gpio_request_one(dev, data->mcu_reset_gpio,
+				    GPIOF_OUT_INIT_HIGH, "mcu-reset-gpios");
+	if (ret)
+		goto err_ap_mcu;
+
+	match = of_match_node(ssp_of_match, node);
+	if (!match)
+		goto err_mcu_reset_gpio;
+
+	data->sensorhub_info = (struct ssp_sensorhub_info *)match->data;
+
+	dev_set_drvdata(dev, data);
+
+	return data;
+
+err_mcu_reset_gpio:
+	devm_gpio_free(dev, data->mcu_reset_gpio);
+err_ap_mcu:
+	devm_gpio_free(dev, data->ap_mcu_gpio);
+err_free_pd:
+	devm_kfree(dev, data);
+	return NULL;
+}
+#else
+static struct ssp_data *ssp_parse_dt(struct device *pdev)
+{
+	return NULL;
+}
+#endif
+
+/**
+ * ssp_register_consumer() - registers iio consumer in ssp framework
+ *
+ * @indio_dev:	consumer iio device
+ * @type:	ssp sensor type
+ */
+void ssp_register_consumer(struct iio_dev *indio_dev, enum ssp_sensor_type type)
+{
+	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+	data->sensor_devs[type] = indio_dev;
+}
+EXPORT_SYMBOL(ssp_register_consumer);
+
+static int ssp_probe(struct spi_device *spi)
+{
+	int ret, i;
+	struct ssp_data *data;
+
+	data = ssp_parse_dt(&spi->dev);
+	if (!data) {
+		dev_err(&spi->dev, "Failed to find platform data\n");
+		return -ENODEV;
+	}
+
+	ret = mfd_add_devices(&spi->dev, -1, sensorhub_sensor_devs,
+			      ARRAY_SIZE(sensorhub_sensor_devs), NULL, 0, NULL);
+	if (ret < 0) {
+		dev_err(&spi->dev, "mfd add devices fail\n");
+		return ret;
+	}
+
+	spi->mode = SPI_MODE_1;
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		dev_err(&spi->dev, "Failed to setup spi\n");
+		return ret;
+	}
+
+	data->fw_dl_state = SSP_FW_DL_STATE_NONE;
+	data->spi = spi;
+	spi_set_drvdata(spi, data);
+
+	mutex_init(&data->comm_lock);
+
+	for (i = 0; i < SSP_SENSOR_MAX; ++i) {
+		data->delay_buf[i] = SSP_DEFAULT_POLLING_DELAY;
+		data->batch_latency_buf[i] = 0;
+		data->batch_opt_buf[i] = 0;
+		data->check_status[i] = SSP_INITIALIZATION_STATE;
+	}
+
+	data->delay_buf[SSP_BIO_HRM_LIB] = 100;
+
+	data->time_syncing = true;
+
+	mutex_init(&data->pending_lock);
+	INIT_LIST_HEAD(&data->pending_list);
+
+	atomic_set(&data->enable_refcount, 0);
+
+	INIT_WORK(&data->work_wdt, ssp_wdt_work_func);
+	INIT_DELAYED_WORK(&data->work_refresh, ssp_refresh_task);
+
+	setup_timer(&data->wdt_timer, ssp_wdt_timer_func, (unsigned long)data);
+
+	ret = request_threaded_irq(data->spi->irq, NULL,
+				   ssp_irq_thread_fn,
+				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				   "SSP_Int", data);
+	if (ret < 0) {
+		dev_err(&spi->dev, "Irq request fail\n");
+		goto err_setup_irq;
+	}
+
+	/* Let's start with enabled one so irq balance could be ok */
+	data->shut_down = false;
+
+	/* just to avoid unbalanced irq set wake up */
+	enable_irq_wake(data->spi->irq);
+
+	data->fw_dl_state = ssp_check_fwbl(data);
+	if (data->fw_dl_state == SSP_FW_DL_STATE_NONE) {
+		ret = ssp_initialize_mcu(data);
+		if (ret < 0) {
+			dev_err(&spi->dev, "Initialize_mcu failed\n");
+			goto err_read_reg;
+		}
+	} else {
+		dev_err(&spi->dev, "Firmware version not supported\n");
+		ret = -EPERM;
+		goto err_read_reg;
+	}
+
+	return 0;
+
+err_read_reg:
+	free_irq(data->spi->irq, data);
+err_setup_irq:
+	mutex_destroy(&data->pending_lock);
+	mutex_destroy(&data->comm_lock);
+
+	dev_err(&spi->dev, "Probe failed!\n");
+
+	return ret;
+}
+
+static int ssp_remove(struct spi_device *spi)
+{
+	struct ssp_data *data = spi_get_drvdata(spi);
+
+	if (ssp_command(data, SSP_MSG2SSP_AP_STATUS_SHUTDOWN, 0) < 0)
+		dev_err(&data->spi->dev,
+			"SSP_MSG2SSP_AP_STATUS_SHUTDOWN failed\n");
+
+	ssp_enable_mcu(data, false);
+	ssp_disable_wdt_timer(data);
+
+	ssp_clean_pending_list(data);
+
+	free_irq(data->spi->irq, data);
+
+	del_timer_sync(&data->wdt_timer);
+	cancel_work_sync(&data->work_wdt);
+
+	mutex_destroy(&data->comm_lock);
+	mutex_destroy(&data->pending_lock);
+
+	mfd_remove_devices(&spi->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ssp_suspend(struct device *dev)
+{
+	int ret;
+	struct ssp_data *data = spi_get_drvdata(to_spi_device(dev));
+
+	data->last_resume_state = SSP_MSG2SSP_AP_STATUS_SUSPEND;
+
+	if (atomic_read(&data->enable_refcount) > 0)
+		ssp_disable_wdt_timer(data);
+
+	ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_SUSPEND, 0);
+	if (ret < 0) {
+		dev_err(&data->spi->dev,
+			"%s SSP_MSG2SSP_AP_STATUS_SUSPEND failed\n", __func__);
+
+		ssp_enable_wdt_timer(data);
+		return ret;
+	}
+
+	data->time_syncing = false;
+	disable_irq(data->spi->irq);
+
+	return 0;
+}
+
+static int ssp_resume(struct device *dev)
+{
+	int ret;
+	struct ssp_data *data = spi_get_drvdata(to_spi_device(dev));
+
+	enable_irq(data->spi->irq);
+
+	if (atomic_read(&data->enable_refcount) > 0)
+		ssp_enable_wdt_timer(data);
+
+	ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_RESUME, 0);
+	if (ret < 0) {
+		dev_err(&data->spi->dev,
+			"%s SSP_MSG2SSP_AP_STATUS_RESUME failed\n", __func__);
+		ssp_disable_wdt_timer(data);
+		return ret;
+	}
+
+	/* timesyncing is set by MCU */
+	data->last_resume_state = SSP_MSG2SSP_AP_STATUS_RESUME;
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops ssp_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(ssp_suspend, ssp_resume)
+};
+
+static struct spi_driver ssp_driver = {
+	.probe = ssp_probe,
+	.remove = ssp_remove,
+	.driver = {
+		.pm = &ssp_pm_ops,
+		.bus = &spi_bus_type,
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(ssp_of_match),
+		.name = "sensorhub"
+	},
+};
+
+module_spi_driver(ssp_driver);
+
+MODULE_DESCRIPTION("ssp sensorhub driver");
+MODULE_AUTHOR("Samsung Electronics");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/iio/common/ssp_sensors/ssp_iio.c b/kernel/drivers/iio/common/ssp_sensors/ssp_iio.c
new file mode 100644
index 000000000..a3ae165f8
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/ssp_iio.c
@@ -0,0 +1,107 @@
+/*
+ *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ *  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.
+ *
+ *  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.
+ *
+ */
+
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "ssp_iio_sensor.h"
+
+/**
+ * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
+ *
+ * @indio_dev:		iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
+{
+	struct ssp_sensor_data *spd = iio_priv(indio_dev);
+	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+	/* the allocation is made in post because scan size is known in this
+	 * moment
+	 * */
+	spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
+	if (!spd->buffer)
+		return -ENOMEM;
+
+	return ssp_enable_sensor(data, spd->type,
+				 ssp_get_sensor_delay(data, spd->type));
+}
+EXPORT_SYMBOL(ssp_common_buffer_postenable);
+
+/**
+ * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
+ *
+ * @indio_dev:		iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
+{
+	int ret;
+	struct ssp_sensor_data *spd = iio_priv(indio_dev);
+	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+	ret = ssp_disable_sensor(data, spd->type);
+	if (ret < 0)
+		return ret;
+
+	kfree(spd->buffer);
+
+	return ret;
+}
+EXPORT_SYMBOL(ssp_common_buffer_postdisable);
+
+/**
+ * ssp_common_process_data() - Common process data callback for ssp sensors
+ *
+ * @indio_dev:		iio device
+ * @buf:		source buffer
+ * @len:		sensor data length
+ * @timestamp:		system timestamp
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
+			    unsigned int len, int64_t timestamp)
+{
+	__le32 time;
+	int64_t calculated_time;
+	struct ssp_sensor_data *spd = iio_priv(indio_dev);
+
+	if (indio_dev->scan_bytes == 0)
+		return 0;
+
+	/*
+	 * it always sends full set of samples, remember about available masks
+	 */
+	memcpy(spd->buffer, buf, len);
+
+	if (indio_dev->scan_timestamp) {
+		memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
+		calculated_time =
+			timestamp + (int64_t)le32_to_cpu(time) * 1000000;
+	}
+
+	return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
+						  calculated_time);
+}
+EXPORT_SYMBOL(ssp_common_process_data);
+
+MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
+MODULE_DESCRIPTION("Samsung sensorhub commons");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h b/kernel/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
new file mode 100644
index 000000000..541c6590d
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
@@ -0,0 +1,71 @@
+#ifndef __SSP_IIO_SENSOR_H__
+#define __SSP_IIO_SENSOR_H__
+
+#define SSP_CHANNEL_AG(_type, _mod, _index) \
+{ \
+		.type = _type,\
+		.modified = 1,\
+		.channel2 = _mod,\
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
+		.scan_index = _index,\
+		.scan_type = {\
+			.sign = 's',\
+			.realbits = 16,\
+			.storagebits = 16,\
+			.shift = 0,\
+			.endianness = IIO_LE,\
+		},\
+}
+
+/* It is defined here as it is a mixed timestamp */
+#define SSP_CHAN_TIMESTAMP(_si) {					\
+	.type = IIO_TIMESTAMP,						\
+	.channel = -1,							\
+	.scan_index = _si,						\
+	.scan_type = {							\
+		.sign = 's',						\
+		.realbits = 64,						\
+		.storagebits = 64,					\
+		},							\
+}
+
+#define SSP_MS_PER_S			1000
+#define SSP_INVERTED_SCALING_FACTOR	1000000U
+
+#define SSP_FACTOR_WITH_MS \
+	(SSP_INVERTED_SCALING_FACTOR * SSP_MS_PER_S)
+
+int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
+
+int ssp_common_buffer_postdisable(struct iio_dev *indio_dev);
+
+int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
+			    unsigned int len, int64_t timestamp);
+
+/* Converts time in ms to frequency */
+static inline void ssp_convert_to_freq(u32 time, int *integer_part,
+				       int *fractional)
+{
+	if (time == 0) {
+		*fractional = 0;
+		*integer_part = 0;
+		return;
+	}
+
+	*integer_part = SSP_FACTOR_WITH_MS / time;
+	*fractional = *integer_part % SSP_INVERTED_SCALING_FACTOR;
+	*integer_part = *integer_part / SSP_INVERTED_SCALING_FACTOR;
+}
+
+/* Converts frequency to time in ms */
+static inline int ssp_convert_to_time(int integer_part, int fractional)
+{
+	u64 value;
+
+	value = (u64)integer_part * SSP_INVERTED_SCALING_FACTOR + fractional;
+	if (value == 0)
+		return 0;
+
+	return div64_u64((u64)SSP_FACTOR_WITH_MS, value);
+}
+#endif /* __SSP_IIO_SENSOR_H__ */
diff --git a/kernel/drivers/iio/common/ssp_sensors/ssp_spi.c b/kernel/drivers/iio/common/ssp_sensors/ssp_spi.c
new file mode 100644
index 000000000..704284a47
--- /dev/null
+++ b/kernel/drivers/iio/common/ssp_sensors/ssp_spi.c
@@ -0,0 +1,608 @@
+/*
+ *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ *  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.
+ *
+ *  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.
+ *
+ */
+
+#include "ssp.h"
+
+#define SSP_DEV (&data->spi->dev)
+#define SSP_GET_MESSAGE_TYPE(data) (data & (3 << SSP_RW))
+
+/*
+ * SSP -> AP Instruction
+ * They tell what packet type can be expected. In the future there will
+ * be less of them. BYPASS means common sensor packets with accel, gyro,
+ * hrm etc. data. LIBRARY and META are mock-up's for now.
+ */
+#define SSP_MSG2AP_INST_BYPASS_DATA		0x37
+#define SSP_MSG2AP_INST_LIBRARY_DATA		0x01
+#define SSP_MSG2AP_INST_DEBUG_DATA		0x03
+#define SSP_MSG2AP_INST_BIG_DATA		0x04
+#define SSP_MSG2AP_INST_META_DATA		0x05
+#define SSP_MSG2AP_INST_TIME_SYNC		0x06
+#define SSP_MSG2AP_INST_RESET			0x07
+
+#define SSP_UNIMPLEMENTED -1
+
+struct ssp_msg_header {
+	u8 cmd;
+	__le16 length;
+	__le16 options;
+	__le32 data;
+} __attribute__((__packed__));
+
+struct ssp_msg {
+	u16 length;
+	u16 options;
+	struct list_head list;
+	struct completion *done;
+	struct ssp_msg_header *h;
+	char *buffer;
+};
+
+static const int ssp_offset_map[SSP_SENSOR_MAX] = {
+	[SSP_ACCELEROMETER_SENSOR] =		SSP_ACCELEROMETER_SIZE +
+						SSP_TIME_SIZE,
+	[SSP_GYROSCOPE_SENSOR] =		SSP_GYROSCOPE_SIZE +
+						SSP_TIME_SIZE,
+	[SSP_GEOMAGNETIC_UNCALIB_SENSOR] =	SSP_UNIMPLEMENTED,
+	[SSP_GEOMAGNETIC_RAW] =			SSP_UNIMPLEMENTED,
+	[SSP_GEOMAGNETIC_SENSOR] =		SSP_UNIMPLEMENTED,
+	[SSP_PRESSURE_SENSOR] =			SSP_UNIMPLEMENTED,
+	[SSP_GESTURE_SENSOR] =			SSP_UNIMPLEMENTED,
+	[SSP_PROXIMITY_SENSOR] =		SSP_UNIMPLEMENTED,
+	[SSP_TEMPERATURE_HUMIDITY_SENSOR] =	SSP_UNIMPLEMENTED,
+	[SSP_LIGHT_SENSOR] =			SSP_UNIMPLEMENTED,
+	[SSP_PROXIMITY_RAW] =			SSP_UNIMPLEMENTED,
+	[SSP_ORIENTATION_SENSOR] =		SSP_UNIMPLEMENTED,
+	[SSP_STEP_DETECTOR] =			SSP_UNIMPLEMENTED,
+	[SSP_SIG_MOTION_SENSOR] =		SSP_UNIMPLEMENTED,
+	[SSP_GYRO_UNCALIB_SENSOR] =		SSP_UNIMPLEMENTED,
+	[SSP_GAME_ROTATION_VECTOR] =		SSP_UNIMPLEMENTED,
+	[SSP_ROTATION_VECTOR] =			SSP_UNIMPLEMENTED,
+	[SSP_STEP_COUNTER] =			SSP_UNIMPLEMENTED,
+	[SSP_BIO_HRM_RAW] =			SSP_BIO_HRM_RAW_SIZE +
+						SSP_TIME_SIZE,
+	[SSP_BIO_HRM_RAW_FAC] =			SSP_BIO_HRM_RAW_FAC_SIZE +
+						SSP_TIME_SIZE,
+	[SSP_BIO_HRM_LIB] =			SSP_BIO_HRM_LIB_SIZE +
+						SSP_TIME_SIZE,
+};
+
+#define SSP_HEADER_SIZE		(sizeof(struct ssp_msg_header))
+#define SSP_HEADER_SIZE_ALIGNED	(ALIGN(SSP_HEADER_SIZE, 4))
+
+static struct ssp_msg *ssp_create_msg(u8 cmd, u16 len, u16 opt, u32 data)
+{
+	struct ssp_msg_header h;
+	struct ssp_msg *msg;
+
+	msg = kzalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return NULL;
+
+	h.cmd = cmd;
+	h.length = cpu_to_le16(len);
+	h.options = cpu_to_le16(opt);
+	h.data = cpu_to_le32(data);
+
+	msg->buffer = kzalloc(SSP_HEADER_SIZE_ALIGNED + len,
+			      GFP_KERNEL | GFP_DMA);
+	if (!msg->buffer) {
+		kfree(msg);
+		return NULL;
+	}
+
+	msg->length = len;
+	msg->options = opt;
+
+	memcpy(msg->buffer, &h, SSP_HEADER_SIZE);
+
+	return msg;
+}
+
+/*
+ * It is a bit heavy to do it this way but often the function is used to compose
+ * the message from smaller chunks which are placed on the stack.  Often the
+ * chunks are small so memcpy should be optimalized.
+ */
+static inline void ssp_fill_buffer(struct ssp_msg *m, unsigned int offset,
+				   const void *src, unsigned int len)
+{
+	memcpy(&m->buffer[SSP_HEADER_SIZE_ALIGNED + offset], src, len);
+}
+
+static inline void ssp_get_buffer(struct ssp_msg *m, unsigned int offset,
+				  void *dest, unsigned int len)
+{
+	memcpy(dest, &m->buffer[SSP_HEADER_SIZE_ALIGNED + offset],  len);
+}
+
+#define SSP_GET_BUFFER_AT_INDEX(m, index) \
+	(m->buffer[SSP_HEADER_SIZE_ALIGNED + index])
+#define SSP_SET_BUFFER_AT_INDEX(m, index, val) \
+	(m->buffer[SSP_HEADER_SIZE_ALIGNED + index] = val)
+
+static void ssp_clean_msg(struct ssp_msg *m)
+{
+	kfree(m->buffer);
+	kfree(m);
+}
+
+static int ssp_print_mcu_debug(char *data_frame, int *data_index,
+			       int received_len)
+{
+	int length = data_frame[(*data_index)++];
+
+	if (length > received_len - *data_index || length <= 0) {
+		ssp_dbg("[SSP]: MSG From MCU-invalid debug length(%d/%d)\n",
+			length, received_len);
+		return length ? length : -EPROTO;
+	}
+
+	ssp_dbg("[SSP]: MSG From MCU - %s\n", &data_frame[*data_index]);
+
+	*data_index += length;
+
+	return 0;
+}
+
+/*
+ * It was designed that way - additional lines to some kind of handshake,
+ * please do not ask why - only the firmware guy can know it.
+ */
+static int ssp_check_lines(struct ssp_data *data, bool state)
+{
+	int delay_cnt = 0;
+
+	gpio_set_value_cansleep(data->ap_mcu_gpio, state);
+
+	while (gpio_get_value_cansleep(data->mcu_ap_gpio) != state) {
+		usleep_range(3000, 3500);
+
+		if (data->shut_down || delay_cnt++ > 500) {
+			dev_err(SSP_DEV, "%s:timeout, hw ack wait fail %d\n",
+				__func__, state);
+
+			if (!state)
+				gpio_set_value_cansleep(data->ap_mcu_gpio, 1);
+
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg,
+			   struct completion *done, int timeout)
+{
+	int status;
+	/*
+	 * check if this is a short one way message or the whole transfer has
+	 * second part after an interrupt
+	 */
+	const bool use_no_irq = msg->length == 0;
+
+	if (data->shut_down)
+		return -EPERM;
+
+	msg->done = done;
+
+	mutex_lock(&data->comm_lock);
+
+	status = ssp_check_lines(data, false);
+	if (status < 0)
+		goto _error_locked;
+
+	status = spi_write(data->spi, msg->buffer, SSP_HEADER_SIZE);
+	if (status < 0) {
+		gpio_set_value_cansleep(data->ap_mcu_gpio, 1);
+		dev_err(SSP_DEV, "%s spi_write fail\n", __func__);
+		goto _error_locked;
+	}
+
+	if (!use_no_irq) {
+		mutex_lock(&data->pending_lock);
+		list_add_tail(&msg->list, &data->pending_list);
+		mutex_unlock(&data->pending_lock);
+	}
+
+	status = ssp_check_lines(data, true);
+	if (status < 0) {
+		if (!use_no_irq) {
+			mutex_lock(&data->pending_lock);
+			list_del(&msg->list);
+			mutex_unlock(&data->pending_lock);
+		}
+		goto _error_locked;
+	}
+
+	mutex_unlock(&data->comm_lock);
+
+	if (!use_no_irq && done)
+		if (wait_for_completion_timeout(done,
+						msecs_to_jiffies(timeout)) ==
+		    0) {
+			mutex_lock(&data->pending_lock);
+			list_del(&msg->list);
+			mutex_unlock(&data->pending_lock);
+
+			data->timeout_cnt++;
+			return -ETIMEDOUT;
+		}
+
+	return 0;
+
+_error_locked:
+	mutex_unlock(&data->comm_lock);
+	data->timeout_cnt++;
+	return status;
+}
+
+static inline int ssp_spi_sync_command(struct ssp_data *data,
+				       struct ssp_msg *msg)
+{
+	return ssp_do_transfer(data, msg, NULL, 0);
+}
+
+static int ssp_spi_sync(struct ssp_data *data, struct ssp_msg *msg,
+			int timeout)
+{
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	if (WARN_ON(!msg->length))
+		return -EPERM;
+
+	return ssp_do_transfer(data, msg, &done, timeout);
+}
+
+static int ssp_handle_big_data(struct ssp_data *data, char *dataframe, int *idx)
+{
+	/* mock-up, it will be changed with adding another sensor types */
+	*idx += 8;
+	return 0;
+}
+
+static int ssp_parse_dataframe(struct ssp_data *data, char *dataframe, int len)
+{
+	int idx, sd;
+	struct timespec ts;
+	struct ssp_sensor_data *spd;
+	struct iio_dev **indio_devs = data->sensor_devs;
+
+	getnstimeofday(&ts);
+
+	for (idx = 0; idx < len;) {
+		switch (dataframe[idx++]) {
+		case SSP_MSG2AP_INST_BYPASS_DATA:
+			sd = dataframe[idx++];
+			if (sd < 0 || sd >= SSP_SENSOR_MAX) {
+				dev_err(SSP_DEV,
+					"Mcu data frame1 error %d\n", sd);
+				return -EPROTO;
+			}
+
+			if (indio_devs[sd]) {
+				spd = iio_priv(indio_devs[sd]);
+				if (spd->process_data)
+					spd->process_data(indio_devs[sd],
+							  &dataframe[idx],
+							  data->timestamp);
+			} else {
+				dev_err(SSP_DEV, "no client for frame\n");
+			}
+
+			idx += ssp_offset_map[sd];
+			break;
+		case SSP_MSG2AP_INST_DEBUG_DATA:
+			sd = ssp_print_mcu_debug(dataframe, &idx, len);
+			if (sd) {
+				dev_err(SSP_DEV,
+					"Mcu data frame3 error %d\n", sd);
+				return sd;
+			}
+			break;
+		case SSP_MSG2AP_INST_LIBRARY_DATA:
+			idx += len;
+			break;
+		case SSP_MSG2AP_INST_BIG_DATA:
+			ssp_handle_big_data(data, dataframe, &idx);
+			break;
+		case SSP_MSG2AP_INST_TIME_SYNC:
+			data->time_syncing = true;
+			break;
+		case SSP_MSG2AP_INST_RESET:
+			ssp_queue_ssp_refresh_task(data, 0);
+			break;
+		}
+	}
+
+	if (data->time_syncing)
+		data->timestamp = ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+
+	return 0;
+}
+
+/* threaded irq */
+int ssp_irq_msg(struct ssp_data *data)
+{
+	bool found = false;
+	char *buffer;
+	u8 msg_type;
+	int ret;
+	u16 length, msg_options;
+	struct ssp_msg *msg, *n;
+
+	ret = spi_read(data->spi, data->header_buffer, SSP_HEADER_BUFFER_SIZE);
+	if (ret < 0) {
+		dev_err(SSP_DEV, "header read fail\n");
+		return ret;
+	}
+
+	length = le16_to_cpu(data->header_buffer[1]);
+	msg_options = le16_to_cpu(data->header_buffer[0]);
+
+	if (length == 0) {
+		dev_err(SSP_DEV, "length received from mcu is 0\n");
+		return -EINVAL;
+	}
+
+	msg_type = SSP_GET_MESSAGE_TYPE(msg_options);
+
+	switch (msg_type) {
+	case SSP_AP2HUB_READ:
+	case SSP_AP2HUB_WRITE:
+		/*
+		 * this is a small list, a few elements - the packets can be
+		 * received with no order
+		 */
+		mutex_lock(&data->pending_lock);
+		list_for_each_entry_safe(msg, n, &data->pending_list, list) {
+			if (msg->options == msg_options) {
+				list_del(&msg->list);
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			/*
+			 * here can be implemented dead messages handling
+			 * but the slave should not send such ones - it is to
+			 * check but let's handle this
+			 */
+			buffer = kmalloc(length, GFP_KERNEL | GFP_DMA);
+			if (!buffer) {
+				ret = -ENOMEM;
+				goto _unlock;
+			}
+
+			/* got dead packet so it is always an error */
+			ret = spi_read(data->spi, buffer, length);
+			if (ret >= 0)
+				ret = -EPROTO;
+
+			kfree(buffer);
+
+			dev_err(SSP_DEV, "No match error %x\n",
+				msg_options);
+
+			goto _unlock;
+		}
+
+		if (msg_type == SSP_AP2HUB_READ)
+			ret = spi_read(data->spi,
+				       &msg->buffer[SSP_HEADER_SIZE_ALIGNED],
+				       msg->length);
+
+		if (msg_type == SSP_AP2HUB_WRITE) {
+			ret = spi_write(data->spi,
+					&msg->buffer[SSP_HEADER_SIZE_ALIGNED],
+					msg->length);
+			if (msg_options & SSP_AP2HUB_RETURN) {
+				msg->options =
+					SSP_AP2HUB_READ | SSP_AP2HUB_RETURN;
+				msg->length = 1;
+
+				list_add_tail(&msg->list, &data->pending_list);
+				goto _unlock;
+			}
+		}
+
+		if (msg->done)
+			if (!completion_done(msg->done))
+				complete(msg->done);
+_unlock:
+		mutex_unlock(&data->pending_lock);
+		break;
+	case SSP_HUB2AP_WRITE:
+		buffer = kzalloc(length, GFP_KERNEL | GFP_DMA);
+		if (!buffer)
+			return -ENOMEM;
+
+		ret = spi_read(data->spi, buffer, length);
+		if (ret < 0) {
+			dev_err(SSP_DEV, "spi read fail\n");
+			kfree(buffer);
+			break;
+		}
+
+		ret = ssp_parse_dataframe(data, buffer, length);
+
+		kfree(buffer);
+		break;
+
+	default:
+		dev_err(SSP_DEV, "unknown msg type\n");
+		return -EPROTO;
+	}
+
+	return ret;
+}
+
+void ssp_clean_pending_list(struct ssp_data *data)
+{
+	struct ssp_msg *msg, *n;
+
+	mutex_lock(&data->pending_lock);
+	list_for_each_entry_safe(msg, n, &data->pending_list, list) {
+		list_del(&msg->list);
+
+		if (msg->done)
+			if (!completion_done(msg->done))
+				complete(msg->done);
+	}
+	mutex_unlock(&data->pending_lock);
+}
+
+int ssp_command(struct ssp_data *data, char command, int arg)
+{
+	int ret;
+	struct ssp_msg *msg;
+
+	msg = ssp_create_msg(command, 0, SSP_AP2HUB_WRITE, arg);
+	if (!msg)
+		return -ENOMEM;
+
+	ssp_dbg("%s - command 0x%x %d\n", __func__, command, arg);
+
+	ret = ssp_spi_sync_command(data, msg);
+	ssp_clean_msg(msg);
+
+	return ret;
+}
+
+int ssp_send_instruction(struct ssp_data *data, u8 inst, u8 sensor_type,
+			 u8 *send_buf, u8 length)
+{
+	int ret;
+	struct ssp_msg *msg;
+
+	if (data->fw_dl_state == SSP_FW_DL_STATE_DOWNLOADING) {
+		dev_err(SSP_DEV, "%s - Skip Inst! DL state = %d\n",
+			__func__, data->fw_dl_state);
+		return -EBUSY;
+	} else if (!(data->available_sensors & BIT(sensor_type)) &&
+		   (inst <= SSP_MSG2SSP_INST_CHANGE_DELAY)) {
+		dev_err(SSP_DEV, "%s - Bypass Inst Skip! - %u\n",
+			__func__, sensor_type);
+		return -EIO; /* just fail */
+	}
+
+	msg = ssp_create_msg(inst, length + 2, SSP_AP2HUB_WRITE, 0);
+	if (!msg)
+		return -ENOMEM;
+
+	ssp_fill_buffer(msg, 0, &sensor_type, 1);
+	ssp_fill_buffer(msg, 1, send_buf, length);
+
+	ssp_dbg("%s - Inst = 0x%x, Sensor Type = 0x%x, data = %u\n",
+		__func__, inst, sensor_type, send_buf[1]);
+
+	ret = ssp_spi_sync(data, msg, 1000);
+	ssp_clean_msg(msg);
+
+	return ret;
+}
+
+int ssp_get_chipid(struct ssp_data *data)
+{
+	int ret;
+	char buffer;
+	struct ssp_msg *msg;
+
+	msg = ssp_create_msg(SSP_MSG2SSP_AP_WHOAMI, 1, SSP_AP2HUB_READ, 0);
+	if (!msg)
+		return -ENOMEM;
+
+	ret = ssp_spi_sync(data, msg, 1000);
+
+	buffer = SSP_GET_BUFFER_AT_INDEX(msg, 0);
+
+	ssp_clean_msg(msg);
+
+	return ret < 0 ? ret : buffer;
+}
+
+int ssp_set_magnetic_matrix(struct ssp_data *data)
+{
+	int ret;
+	struct ssp_msg *msg;
+
+	msg = ssp_create_msg(SSP_MSG2SSP_AP_SET_MAGNETIC_STATIC_MATRIX,
+			     data->sensorhub_info->mag_length, SSP_AP2HUB_WRITE,
+			     0);
+	if (!msg)
+		return -ENOMEM;
+
+	ssp_fill_buffer(msg, 0, data->sensorhub_info->mag_table,
+			data->sensorhub_info->mag_length);
+
+	ret = ssp_spi_sync(data, msg, 1000);
+	ssp_clean_msg(msg);
+
+	return ret;
+}
+
+unsigned int ssp_get_sensor_scanning_info(struct ssp_data *data)
+{
+	int ret;
+	__le32 result;
+	u32 cpu_result = 0;
+
+	struct ssp_msg *msg = ssp_create_msg(SSP_MSG2SSP_AP_SENSOR_SCANNING, 4,
+					     SSP_AP2HUB_READ, 0);
+	if (!msg)
+		return 0;
+
+	ret = ssp_spi_sync(data, msg, 1000);
+	if (ret < 0) {
+		dev_err(SSP_DEV, "%s - spi read fail %d\n", __func__, ret);
+		goto _exit;
+	}
+
+	ssp_get_buffer(msg, 0, &result, 4);
+	cpu_result = le32_to_cpu(result);
+
+	dev_info(SSP_DEV, "%s state: 0x%08x\n", __func__, cpu_result);
+
+_exit:
+	ssp_clean_msg(msg);
+	return cpu_result;
+}
+
+unsigned int ssp_get_firmware_rev(struct ssp_data *data)
+{
+	int ret;
+	__le32 result;
+
+	struct ssp_msg *msg = ssp_create_msg(SSP_MSG2SSP_AP_FIRMWARE_REV, 4,
+					     SSP_AP2HUB_READ, 0);
+	if (!msg)
+		return SSP_INVALID_REVISION;
+
+	ret = ssp_spi_sync(data, msg, 1000);
+	if (ret < 0) {
+		dev_err(SSP_DEV, "%s - transfer fail %d\n", __func__, ret);
+		ret = SSP_INVALID_REVISION;
+		goto _exit;
+	}
+
+	ssp_get_buffer(msg, 0, &result, 4);
+	ret = le32_to_cpu(result);
+
+_exit:
+	ssp_clean_msg(msg);
+	return ret;
+}
diff --git a/kernel/drivers/iio/common/st_sensors/Kconfig b/kernel/drivers/iio/common/st_sensors/Kconfig
new file mode 100644
index 000000000..865f1ca33
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/Kconfig
@@ -0,0 +1,14 @@
+#
+# STMicroelectronics sensors common library
+#
+
+config IIO_ST_SENSORS_I2C
+	tristate
+
+config IIO_ST_SENSORS_SPI
+	tristate
+
+config IIO_ST_SENSORS_CORE
+	tristate
+	select IIO_ST_SENSORS_I2C if I2C
+	select IIO_ST_SENSORS_SPI if SPI_MASTER
diff --git a/kernel/drivers/iio/common/st_sensors/Makefile b/kernel/drivers/iio/common/st_sensors/Makefile
new file mode 100644
index 000000000..9f3e24f30
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the STMicroelectronics sensor common modules.
+#
+
+obj-$(CONFIG_IIO_ST_SENSORS_I2C) += st_sensors_i2c.o
+obj-$(CONFIG_IIO_ST_SENSORS_SPI) += st_sensors_spi.o
+obj-$(CONFIG_IIO_ST_SENSORS_CORE) += st_sensors.o
+st_sensors-y := st_sensors_core.o
+st_sensors-$(CONFIG_IIO_BUFFER) += st_sensors_buffer.o
+st_sensors-$(CONFIG_IIO_TRIGGER) += st_sensors_trigger.o
diff --git a/kernel/drivers/iio/common/st_sensors/st_sensors_buffer.c b/kernel/drivers/iio/common/st_sensors/st_sensors_buffer.c
new file mode 100644
index 000000000..e18bc6782
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/st_sensors_buffer.c
@@ -0,0 +1,128 @@
+/*
+ * STMicroelectronics sensors buffer library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/irqreturn.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
+{
+	u8 *addr;
+	int i, n = 0, len;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	unsigned int num_data_channels = sdata->num_data_channels;
+	unsigned int byte_for_channel =
+			indio_dev->channels[0].scan_type.storagebits >> 3;
+
+	addr = kmalloc(num_data_channels, GFP_KERNEL);
+	if (!addr) {
+		len = -ENOMEM;
+		goto st_sensors_get_buffer_element_error;
+	}
+
+	for (i = 0; i < num_data_channels; i++) {
+		if (test_bit(i, indio_dev->active_scan_mask)) {
+			addr[n] = indio_dev->channels[i].address;
+			n++;
+		}
+	}
+	switch (n) {
+	case 1:
+		len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
+			addr[0], byte_for_channel, buf, sdata->multiread_bit);
+		break;
+	case 2:
+		if ((addr[1] - addr[0]) == byte_for_channel) {
+			len = sdata->tf->read_multiple_byte(&sdata->tb,
+				sdata->dev, addr[0], byte_for_channel * n,
+				buf, sdata->multiread_bit);
+		} else {
+			u8 *rx_array;
+			rx_array = kmalloc(byte_for_channel * num_data_channels,
+					   GFP_KERNEL);
+			if (!rx_array) {
+				len = -ENOMEM;
+				goto st_sensors_free_memory;
+			}
+
+			len = sdata->tf->read_multiple_byte(&sdata->tb,
+				sdata->dev, addr[0],
+				byte_for_channel * num_data_channels,
+				rx_array, sdata->multiread_bit);
+			if (len < 0) {
+				kfree(rx_array);
+				goto st_sensors_free_memory;
+			}
+
+			for (i = 0; i < n * byte_for_channel; i++) {
+				if (i < n)
+					buf[i] = rx_array[i];
+				else
+					buf[i] = rx_array[n + i];
+			}
+			kfree(rx_array);
+			len = byte_for_channel * n;
+		}
+		break;
+	case 3:
+		len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
+			addr[0], byte_for_channel * num_data_channels,
+			buf, sdata->multiread_bit);
+		break;
+	default:
+		len = -EINVAL;
+		goto st_sensors_free_memory;
+	}
+	if (len != byte_for_channel * n) {
+		len = -EIO;
+		goto st_sensors_free_memory;
+	}
+
+st_sensors_free_memory:
+	kfree(addr);
+st_sensors_get_buffer_element_error:
+	return len;
+}
+EXPORT_SYMBOL(st_sensors_get_buffer_element);
+
+irqreturn_t st_sensors_trigger_handler(int irq, void *p)
+{
+	int len;
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
+	if (len < 0)
+		goto st_sensors_get_buffer_element_error;
+
+	iio_push_to_buffers_with_timestamp(indio_dev, sdata->buffer_data,
+		pf->timestamp);
+
+st_sensors_get_buffer_element_error:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(st_sensors_trigger_handler);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/iio/common/st_sensors/st_sensors_core.c b/kernel/drivers/iio/common/st_sensors/st_sensors_core.c
new file mode 100644
index 000000000..8dd0477e2
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -0,0 +1,556 @@
+/*
+ * STMicroelectronics sensors core library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/of.h>
+#include <asm/unaligned.h>
+#include <linux/iio/common/st_sensors.h>
+
+
+#define ST_SENSORS_WAI_ADDRESS		0x0f
+
+static inline u32 st_sensors_get_unaligned_le24(const u8 *p)
+{
+	return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8;
+}
+
+static int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+						u8 reg_addr, u8 mask, u8 data)
+{
+	int err;
+	u8 new_data;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
+	if (err < 0)
+		goto st_sensors_write_data_with_mask_error;
+
+	new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
+	err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
+
+st_sensors_write_data_with_mask_error:
+	return err;
+}
+
+static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
+			unsigned int odr, struct st_sensor_odr_avl *odr_out)
+{
+	int i, ret = -EINVAL;
+
+	for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+		if (sensor_settings->odr.odr_avl[i].hz == 0)
+			goto st_sensors_match_odr_error;
+
+		if (sensor_settings->odr.odr_avl[i].hz == odr) {
+			odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
+			odr_out->value = sensor_settings->odr.odr_avl[i].value;
+			ret = 0;
+			break;
+		}
+	}
+
+st_sensors_match_odr_error:
+	return ret;
+}
+
+int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
+{
+	int err;
+	struct st_sensor_odr_avl odr_out = {0, 0};
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
+	if (err < 0)
+		goto st_sensors_match_odr_error;
+
+	if ((sdata->sensor_settings->odr.addr ==
+					sdata->sensor_settings->pw.addr) &&
+				(sdata->sensor_settings->odr.mask ==
+					sdata->sensor_settings->pw.mask)) {
+		if (sdata->enabled == true) {
+			err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->odr.addr,
+				sdata->sensor_settings->odr.mask,
+				odr_out.value);
+		} else {
+			err = 0;
+		}
+	} else {
+		err = st_sensors_write_data_with_mask(indio_dev,
+			sdata->sensor_settings->odr.addr,
+			sdata->sensor_settings->odr.mask,
+			odr_out.value);
+	}
+	if (err >= 0)
+		sdata->odr = odr_out.hz;
+
+st_sensors_match_odr_error:
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_set_odr);
+
+static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
+					unsigned int fs, int *index_fs_avl)
+{
+	int i, ret = -EINVAL;
+
+	for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+		if (sensor_settings->fs.fs_avl[i].num == 0)
+			goto st_sensors_match_odr_error;
+
+		if (sensor_settings->fs.fs_avl[i].num == fs) {
+			*index_fs_avl = i;
+			ret = 0;
+			break;
+		}
+	}
+
+st_sensors_match_odr_error:
+	return ret;
+}
+
+static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
+{
+	int err, i = 0;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
+	if (err < 0)
+		goto st_accel_set_fullscale_error;
+
+	err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->fs.addr,
+				sdata->sensor_settings->fs.mask,
+				sdata->sensor_settings->fs.fs_avl[i].value);
+	if (err < 0)
+		goto st_accel_set_fullscale_error;
+
+	sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
+					&sdata->sensor_settings->fs.fs_avl[i];
+	return err;
+
+st_accel_set_fullscale_error:
+	dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
+	return err;
+}
+
+int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
+{
+	u8 tmp_value;
+	int err = -EINVAL;
+	bool found = false;
+	struct st_sensor_odr_avl odr_out = {0, 0};
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	if (enable) {
+		tmp_value = sdata->sensor_settings->pw.value_on;
+		if ((sdata->sensor_settings->odr.addr ==
+					sdata->sensor_settings->pw.addr) &&
+				(sdata->sensor_settings->odr.mask ==
+					sdata->sensor_settings->pw.mask)) {
+			err = st_sensors_match_odr(sdata->sensor_settings,
+							sdata->odr, &odr_out);
+			if (err < 0)
+				goto set_enable_error;
+			tmp_value = odr_out.value;
+			found = true;
+		}
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->pw.addr,
+				sdata->sensor_settings->pw.mask, tmp_value);
+		if (err < 0)
+			goto set_enable_error;
+
+		sdata->enabled = true;
+
+		if (found)
+			sdata->odr = odr_out.hz;
+	} else {
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->pw.addr,
+				sdata->sensor_settings->pw.mask,
+				sdata->sensor_settings->pw.value_off);
+		if (err < 0)
+			goto set_enable_error;
+
+		sdata->enabled = false;
+	}
+
+set_enable_error:
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_set_enable);
+
+int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	return st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->enable_axis.addr,
+				sdata->sensor_settings->enable_axis.mask,
+				axis_enable);
+}
+EXPORT_SYMBOL(st_sensors_set_axis_enable);
+
+void st_sensors_power_enable(struct iio_dev *indio_dev)
+{
+	struct st_sensor_data *pdata = iio_priv(indio_dev);
+	int err;
+
+	/* Regulators not mandatory, but if requested we should enable them. */
+	pdata->vdd = devm_regulator_get_optional(indio_dev->dev.parent, "vdd");
+	if (!IS_ERR(pdata->vdd)) {
+		err = regulator_enable(pdata->vdd);
+		if (err != 0)
+			dev_warn(&indio_dev->dev,
+				 "Failed to enable specified Vdd supply\n");
+	}
+
+	pdata->vdd_io = devm_regulator_get_optional(indio_dev->dev.parent, "vddio");
+	if (!IS_ERR(pdata->vdd_io)) {
+		err = regulator_enable(pdata->vdd_io);
+		if (err != 0)
+			dev_warn(&indio_dev->dev,
+				 "Failed to enable specified Vdd_IO supply\n");
+	}
+}
+EXPORT_SYMBOL(st_sensors_power_enable);
+
+void st_sensors_power_disable(struct iio_dev *indio_dev)
+{
+	struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+	if (!IS_ERR(pdata->vdd))
+		regulator_disable(pdata->vdd);
+
+	if (!IS_ERR(pdata->vdd_io))
+		regulator_disable(pdata->vdd_io);
+}
+EXPORT_SYMBOL(st_sensors_power_disable);
+
+static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
+					struct st_sensors_platform_data *pdata)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	switch (pdata->drdy_int_pin) {
+	case 1:
+		if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
+			dev_err(&indio_dev->dev,
+					"DRDY on INT1 not available.\n");
+			return -EINVAL;
+		}
+		sdata->drdy_int_pin = 1;
+		break;
+	case 2:
+		if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
+			dev_err(&indio_dev->dev,
+					"DRDY on INT2 not available.\n");
+			return -EINVAL;
+		}
+		sdata->drdy_int_pin = 2;
+		break;
+	default:
+		dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
+		struct st_sensors_platform_data *defdata)
+{
+	struct st_sensors_platform_data *pdata;
+	struct device_node *np = dev->of_node;
+	u32 val;
+
+	if (!np)
+		return NULL;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
+		pdata->drdy_int_pin = (u8) val;
+	else
+		pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 1;
+
+	return pdata;
+}
+#else
+static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
+		struct st_sensors_platform_data *defdata)
+{
+	return NULL;
+}
+#endif
+
+int st_sensors_init_sensor(struct iio_dev *indio_dev,
+					struct st_sensors_platform_data *pdata)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	struct st_sensors_platform_data *of_pdata;
+	int err = 0;
+
+	/* If OF/DT pdata exists, it will take precedence of anything else */
+	of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
+	if (of_pdata)
+		pdata = of_pdata;
+
+	if (pdata) {
+		err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
+		if (err < 0)
+			return err;
+	}
+
+	err = st_sensors_set_enable(indio_dev, false);
+	if (err < 0)
+		return err;
+
+	if (sdata->current_fullscale) {
+		err = st_sensors_set_fullscale(indio_dev,
+						sdata->current_fullscale->num);
+		if (err < 0)
+			return err;
+	} else
+		dev_info(&indio_dev->dev, "Full-scale not possible\n");
+
+	err = st_sensors_set_odr(indio_dev, sdata->odr);
+	if (err < 0)
+		return err;
+
+	/* set BDU */
+	err = st_sensors_write_data_with_mask(indio_dev,
+					sdata->sensor_settings->bdu.addr,
+					sdata->sensor_settings->bdu.mask, true);
+	if (err < 0)
+		return err;
+
+	err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_init_sensor);
+
+int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
+{
+	int err;
+	u8 drdy_mask;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	if (!sdata->sensor_settings->drdy_irq.addr)
+		return 0;
+
+	/* Enable/Disable the interrupt generator 1. */
+	if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
+		err = st_sensors_write_data_with_mask(indio_dev,
+				sdata->sensor_settings->drdy_irq.ig1.en_addr,
+				sdata->sensor_settings->drdy_irq.ig1.en_mask,
+				(int)enable);
+		if (err < 0)
+			goto st_accel_set_dataready_irq_error;
+	}
+
+	if (sdata->drdy_int_pin == 1)
+		drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
+	else
+		drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
+
+	/* Enable/Disable the interrupt generator for data ready. */
+	err = st_sensors_write_data_with_mask(indio_dev,
+					sdata->sensor_settings->drdy_irq.addr,
+					drdy_mask, (int)enable);
+
+st_accel_set_dataready_irq_error:
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_set_dataready_irq);
+
+int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
+{
+	int err = -EINVAL, i;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+		if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
+				(sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
+			err = 0;
+			break;
+		}
+	}
+	if (err < 0)
+		goto st_sensors_match_scale_error;
+
+	err = st_sensors_set_fullscale(indio_dev,
+				sdata->sensor_settings->fs.fs_avl[i].num);
+
+st_sensors_match_scale_error:
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
+
+static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *ch, int *data)
+{
+	int err;
+	u8 *outdata;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	unsigned int byte_for_channel = ch->scan_type.storagebits >> 3;
+
+	outdata = kmalloc(byte_for_channel, GFP_KERNEL);
+	if (!outdata)
+		return -ENOMEM;
+
+	err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
+				ch->address, byte_for_channel,
+				outdata, sdata->multiread_bit);
+	if (err < 0)
+		goto st_sensors_free_memory;
+
+	if (byte_for_channel == 2)
+		*data = (s16)get_unaligned_le16(outdata);
+	else if (byte_for_channel == 3)
+		*data = (s32)st_sensors_get_unaligned_le24(outdata);
+
+st_sensors_free_memory:
+	kfree(outdata);
+
+	return err;
+}
+
+int st_sensors_read_info_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *ch, int *val)
+{
+	int err;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	mutex_lock(&indio_dev->mlock);
+	if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
+		err = -EBUSY;
+		goto out;
+	} else {
+		err = st_sensors_set_enable(indio_dev, true);
+		if (err < 0)
+			goto out;
+
+		msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
+		err = st_sensors_read_axis_data(indio_dev, ch, val);
+		if (err < 0)
+			goto out;
+
+		*val = *val >> ch->scan_type.shift;
+
+		err = st_sensors_set_enable(indio_dev, false);
+	}
+out:
+	mutex_unlock(&indio_dev->mlock);
+
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_read_info_raw);
+
+int st_sensors_check_device_support(struct iio_dev *indio_dev,
+			int num_sensors_list,
+			const struct st_sensor_settings *sensor_settings)
+{
+	u8 wai;
+	int i, n, err;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
+					ST_SENSORS_DEFAULT_WAI_ADDRESS, &wai);
+	if (err < 0) {
+		dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n");
+		goto read_wai_error;
+	}
+
+	for (i = 0; i < num_sensors_list; i++) {
+		if (sensor_settings[i].wai == wai)
+			break;
+	}
+	if (i == num_sensors_list)
+		goto device_not_supported;
+
+	for (n = 0; n < ARRAY_SIZE(sensor_settings[i].sensors_supported); n++) {
+		if (strcmp(indio_dev->name,
+				&sensor_settings[i].sensors_supported[n][0]) == 0)
+			break;
+	}
+	if (n == ARRAY_SIZE(sensor_settings[i].sensors_supported)) {
+		dev_err(&indio_dev->dev, "device name and WhoAmI mismatch.\n");
+		goto sensor_name_mismatch;
+	}
+
+	sdata->sensor_settings =
+			(struct st_sensor_settings *)&sensor_settings[i];
+
+	return i;
+
+device_not_supported:
+	dev_err(&indio_dev->dev, "device not supported: WhoAmI (0x%x).\n", wai);
+sensor_name_mismatch:
+	err = -ENODEV;
+read_wai_error:
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_check_device_support);
+
+ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int i, len = 0;
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	mutex_lock(&indio_dev->mlock);
+	for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+		if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
+			break;
+
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
+				sdata->sensor_settings->odr.odr_avl[i].hz);
+	}
+	mutex_unlock(&indio_dev->mlock);
+	buf[len - 1] = '\n';
+
+	return len;
+}
+EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
+
+ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int i, len = 0;
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	mutex_lock(&indio_dev->mlock);
+	for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+		if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
+			break;
+
+		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
+				sdata->sensor_settings->fs.fs_avl[i].gain);
+	}
+	mutex_unlock(&indio_dev->mlock);
+	buf[len - 1] = '\n';
+
+	return len;
+}
+EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/iio/common/st_sensors/st_sensors_i2c.c b/kernel/drivers/iio/common/st_sensors/st_sensors_i2c.c
new file mode 100644
index 000000000..98cfee296
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -0,0 +1,112 @@
+/*
+ * STMicroelectronics sensors i2c library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/iio/iio.h>
+#include <linux/of_device.h>
+
+#include <linux/iio/common/st_sensors_i2c.h>
+
+
+#define ST_SENSORS_I2C_MULTIREAD	0x80
+
+static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	return to_i2c_client(sdata->dev)->irq;
+}
+
+static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb,
+				struct device *dev, u8 reg_addr, u8 *res_byte)
+{
+	int err;
+
+	err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr);
+	if (err < 0)
+		goto st_accel_i2c_read_byte_error;
+
+	*res_byte = err & 0xff;
+
+st_accel_i2c_read_byte_error:
+	return err < 0 ? err : 0;
+}
+
+static int st_sensors_i2c_read_multiple_byte(
+		struct st_sensor_transfer_buffer *tb, struct device *dev,
+			u8 reg_addr, int len, u8 *data, bool multiread_bit)
+{
+	if (multiread_bit)
+		reg_addr |= ST_SENSORS_I2C_MULTIREAD;
+
+	return i2c_smbus_read_i2c_block_data(to_i2c_client(dev),
+							reg_addr, len, data);
+}
+
+static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,
+				struct device *dev, u8 reg_addr, u8 data)
+{
+	return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data);
+}
+
+static const struct st_sensor_transfer_function st_sensors_tf_i2c = {
+	.read_byte = st_sensors_i2c_read_byte,
+	.write_byte = st_sensors_i2c_write_byte,
+	.read_multiple_byte = st_sensors_i2c_read_multiple_byte,
+};
+
+void st_sensors_i2c_configure(struct iio_dev *indio_dev,
+		struct i2c_client *client, struct st_sensor_data *sdata)
+{
+	i2c_set_clientdata(client, indio_dev);
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->name = client->name;
+
+	sdata->dev = &client->dev;
+	sdata->tf = &st_sensors_tf_i2c;
+	sdata->get_irq_data_ready = st_sensors_i2c_get_irq;
+}
+EXPORT_SYMBOL(st_sensors_i2c_configure);
+
+#ifdef CONFIG_OF
+/**
+ * st_sensors_of_i2c_probe() - device tree probe for ST I2C sensors
+ * @client: the I2C client device for the sensor
+ * @match: the OF match table for the device, containing compatible strings
+ *	but also a .data field with the corresponding internal kernel name
+ *	used by this sensor.
+ *
+ * In effect this function matches a compatible string to an internal kernel
+ * name for a certain sensor device, so that the rest of the autodetection can
+ * rely on that name from this point on. I2C client devices will be renamed
+ * to match the internal kernel convention.
+ */
+void st_sensors_of_i2c_probe(struct i2c_client *client,
+			     const struct of_device_id *match)
+{
+	const struct of_device_id *of_id;
+
+	of_id = of_match_device(match, &client->dev);
+	if (!of_id)
+		return;
+
+	/* The name from the OF match takes precedence if present */
+	strncpy(client->name, of_id->data, sizeof(client->name));
+	client->name[sizeof(client->name) - 1] = '\0';
+}
+EXPORT_SYMBOL(st_sensors_of_i2c_probe);
+#endif
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/iio/common/st_sensors/st_sensors_spi.c b/kernel/drivers/iio/common/st_sensors/st_sensors_spi.c
new file mode 100644
index 000000000..5b377373f
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -0,0 +1,122 @@
+/*
+ * STMicroelectronics sensors spi library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/iio/iio.h>
+
+#include <linux/iio/common/st_sensors_spi.h>
+
+
+#define ST_SENSORS_SPI_MULTIREAD	0xc0
+#define ST_SENSORS_SPI_READ		0x80
+
+static unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	return to_spi_device(sdata->dev)->irq;
+}
+
+static int st_sensors_spi_read(struct st_sensor_transfer_buffer *tb,
+	struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit)
+{
+	int err;
+
+	struct spi_transfer xfers[] = {
+		{
+			.tx_buf = tb->tx_buf,
+			.bits_per_word = 8,
+			.len = 1,
+		},
+		{
+			.rx_buf = tb->rx_buf,
+			.bits_per_word = 8,
+			.len = len,
+		}
+	};
+
+	mutex_lock(&tb->buf_lock);
+	if ((multiread_bit) && (len > 1))
+		tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_MULTIREAD;
+	else
+		tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ;
+
+	err = spi_sync_transfer(to_spi_device(dev), xfers, ARRAY_SIZE(xfers));
+	if (err)
+		goto acc_spi_read_error;
+
+	memcpy(data, tb->rx_buf, len);
+	mutex_unlock(&tb->buf_lock);
+	return len;
+
+acc_spi_read_error:
+	mutex_unlock(&tb->buf_lock);
+	return err;
+}
+
+static int st_sensors_spi_read_byte(struct st_sensor_transfer_buffer *tb,
+				struct device *dev, u8 reg_addr, u8 *res_byte)
+{
+	return st_sensors_spi_read(tb, dev, reg_addr, 1, res_byte, false);
+}
+
+static int st_sensors_spi_read_multiple_byte(
+	struct st_sensor_transfer_buffer *tb, struct device *dev,
+			u8 reg_addr, int len, u8 *data, bool multiread_bit)
+{
+	return st_sensors_spi_read(tb, dev, reg_addr, len, data, multiread_bit);
+}
+
+static int st_sensors_spi_write_byte(struct st_sensor_transfer_buffer *tb,
+				struct device *dev, u8 reg_addr, u8 data)
+{
+	int err;
+
+	struct spi_transfer xfers = {
+		.tx_buf = tb->tx_buf,
+		.bits_per_word = 8,
+		.len = 2,
+	};
+
+	mutex_lock(&tb->buf_lock);
+	tb->tx_buf[0] = reg_addr;
+	tb->tx_buf[1] = data;
+
+	err = spi_sync_transfer(to_spi_device(dev), &xfers, 1);
+	mutex_unlock(&tb->buf_lock);
+
+	return err;
+}
+
+static const struct st_sensor_transfer_function st_sensors_tf_spi = {
+	.read_byte = st_sensors_spi_read_byte,
+	.write_byte = st_sensors_spi_write_byte,
+	.read_multiple_byte = st_sensors_spi_read_multiple_byte,
+};
+
+void st_sensors_spi_configure(struct iio_dev *indio_dev,
+			struct spi_device *spi, struct st_sensor_data *sdata)
+{
+	spi_set_drvdata(spi, indio_dev);
+
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->name = spi->modalias;
+
+	sdata->dev = &spi->dev;
+	sdata->tf = &st_sensors_tf_spi;
+	sdata->get_irq_data_ready = st_sensors_spi_get_irq;
+}
+EXPORT_SYMBOL(st_sensors_spi_configure);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors spi driver");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/iio/common/st_sensors/st_sensors_trigger.c b/kernel/drivers/iio/common/st_sensors/st_sensors_trigger.c
new file mode 100644
index 000000000..8d8ca6f1e
--- /dev/null
+++ b/kernel/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -0,0 +1,77 @@
+/*
+ * STMicroelectronics sensors trigger library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
+				const struct iio_trigger_ops *trigger_ops)
+{
+	int err;
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	sdata->trig = iio_trigger_alloc("%s-trigger", indio_dev->name);
+	if (sdata->trig == NULL) {
+		err = -ENOMEM;
+		dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
+		goto iio_trigger_alloc_error;
+	}
+
+	err = request_threaded_irq(sdata->get_irq_data_ready(indio_dev),
+			iio_trigger_generic_data_rdy_poll,
+			NULL,
+			IRQF_TRIGGER_RISING,
+			sdata->trig->name,
+			sdata->trig);
+	if (err)
+		goto request_irq_error;
+
+	iio_trigger_set_drvdata(sdata->trig, indio_dev);
+	sdata->trig->ops = trigger_ops;
+	sdata->trig->dev.parent = sdata->dev;
+
+	err = iio_trigger_register(sdata->trig);
+	if (err < 0) {
+		dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
+		goto iio_trigger_register_error;
+	}
+	indio_dev->trig = iio_trigger_get(sdata->trig);
+
+	return 0;
+
+iio_trigger_register_error:
+	free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig);
+request_irq_error:
+	iio_trigger_free(sdata->trig);
+iio_trigger_alloc_error:
+	return err;
+}
+EXPORT_SYMBOL(st_sensors_allocate_trigger);
+
+void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+	iio_trigger_unregister(sdata->trig);
+	free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig);
+	iio_trigger_free(sdata->trig);
+}
+EXPORT_SYMBOL(st_sensors_deallocate_trigger);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger");
+MODULE_LICENSE("GPL v2");