[PATCH, 2/6] HID-Sensors: Sensor framework

[srinivas pandruvada <srinivas.pandruvada-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Adding processing for HID Sensor usage table as defined by
HID 1.12, Request #: HUTRR39, dated 05 May, 2011.
This driver uses HID driver framework to register, send and
receive events.
This uses MFD framework, so that actual processing for a
specific usage id can be done in a different driver. For
example an accelerometer driver can be a separate driver and
use the interface provided by this driver to register for
events.

Signed-off-by: srinivas pandruvada <srinivas.pandruvada-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 drivers/hid/Kconfig            |   18 +
 drivers/hid/Makefile           |    1 +
 drivers/hid/hid-sensor-hub.c   |  883 ++++++++++++++++++++++++++++++++++++++++
 include/linux/hid-sensor-hub.h |   99 +++++
 include/linux/hid-sensor-ids.h |  116 ++++++
 5 files changed, 1117 insertions(+), 0 deletions(-)
 create mode 100644 drivers/hid/hid-sensor-hub.c
 create mode 100644 include/linux/hid-sensor-hub.h
 create mode 100644 include/linux/hid-sensor-ids.h

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index ffddcba..0c86ab0 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -644,6 +644,24 @@ config HID_ZYDACRON
 	---help---
 	Support for Zydacron remote control.
 
+config HID_SENSOR_HUB
+	tristate "HID Sensors framework support"
+	depends on USB_HID
+	select MFD_CORE
+	default n
+	-- help---
+	  Support for HID Sensor framework. This will provide MFD framework for
+	  adding different sensors, using HID sensor usage table. This defines
+	  a set of interface functions to register callbacks for events so
+	  that the events are transferred to user space using either input
+	  or IIO ineterfaces.
+
+config HID_SENSOR_HUB_DEBUG
+	tristate "HID Sensor debug support"
+	default n
+	-- help---
+	  Debug support for Hid sensors. Enable this flag to debug only.
+
 endmenu
 
 endif # HID_SUPPORT
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 22f1d16..04f7086 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_HID_ZYDACRON)	+= hid-zydacron.o
 obj-$(CONFIG_HID_WACOM)		+= hid-wacom.o
 obj-$(CONFIG_HID_WALTOP)	+= hid-waltop.o
 obj-$(CONFIG_HID_WIIMOTE)	+= hid-wiimote.o
+obj-$(CONFIG_HID_SENSOR_HUB)	+= hid-sensor-hub.o
 
 obj-$(CONFIG_USB_HID)		+= usbhid/
 obj-$(CONFIG_USB_MOUSE)		+= usbhid/
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
new file mode 100644
index 0000000..b8d4b68
--- /dev/null
+++ b/drivers/hid/hid-sensor-hub.c
@@ -0,0 +1,883 @@
+/*
+ * 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/hid.h>
+#include <linux/usb.h>
+#include "usbhid/usbhid.h"
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mfd/core.h>
+#include <linux/list.h>
+#include <linux/hid-sensor-ids.h>
+#include <linux/hid-sensor-hub.h>
+
+#include "hid-ids.h"
+
+#define MAX_HUB_SENSORS	20
+#define MAX_DRIVER_NAME_SIZE 30
+#define RAW_BUFFER_SIZE	128
+#define MAXIMUM_SAMP_FREQUENCY 1000
+#define sensor_hub_in_report(id, dev) sensor_hub_report(id, dev,\
+							HID_INPUT_REPORT)
+#define sensor_hub_out_report(id, dev) sensor_hub_report(id, dev,\
+							HID_OUTPUT_REPORT)
+#define sensor_hub_feature_report(id, dev) sensor_hub_report(id, dev,\
+							HID_FEATURE_REPORT)
+
+/* Description of in-progress IO operation, used for operations
+ * that trigger response from device */
+struct sensor_hub_pending {
+	struct completion ready;
+	u32 usage_id;
+	u32 attr_usage_id;
+	int raw_size;
+	u8 raw_data[RAW_BUFFER_SIZE];
+};
+
+struct sensor_hub_data {
+	struct hid_sensor_hub_device *hsdev;
+	struct mutex mutex;
+	spinlock_t lock;
+	struct sensor_hub_pending *pending;
+	struct list_head dyn_callback_list;
+	spinlock_t dyn_lock;
+};
+
+struct hid_sensor_hub_callbacks_list {
+	struct list_head list;
+	u32 usage_id;
+	struct hid_sensor_hub_callbacks *usage_callback;
+	int initialized;
+	void *priv;
+};
+
+static struct mfd_cell hid_sensor_hub_client_devs[MAX_HUB_SENSORS];
+static int hid_sensor_client_cnt;
+
+static int sensor_hub_check_for_sensor_page(struct hid_device *hdev)
+{
+	int i;
+	int ret = -EINVAL;
+
+	for (i = 0; i < hdev->maxcollection; i++) {
+		struct hid_collection *col = &hdev->collection[i];
+		if (col->type == HID_COLLECTION_PHYSICAL &&
+		   (col->usage & HID_USAGE_PAGE) == HID_UP_SENSOR) {
+			ret = 0;
+			break;
+		}
+	}
+	return ret;
+}
+
+static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
+						int dir)
+{
+	struct list_head *feature_report_list =
+					&hdev->report_enum[dir].report_list;
+	struct hid_report *report = NULL;
+
+	list_for_each_entry(report, feature_report_list, list) {
+		if (report->id == id)
+			return report;
+	}
+	hid_warn(hdev, "No report with id 0x%x found\n", id);
+	return NULL;
+}
+
+#if (defined CONFIG_HID_SENSOR_HUB_DEBUG) || \
+	(defined CONFIG_HID_SENSOR_HUB_DEBUG_MODULE)
+static void dump_report(struct hid_device *hdev)
+{
+	int i, j;
+	struct hid_report *report;
+	struct hid_field *field;
+	struct hid_report_enum *report_enum;
+
+	hid_dbg(hdev, "Bus:0x%x Vendor:0x%x Product:0x%x\n", hdev->bus,
+			hdev->vendor, hdev->product);
+	hid_dbg(hdev, "rsize=%d, max_collections:%d\n", hdev->rsize,
+			hdev->maxcollection);
+	for (i = 0; i < hdev->maxcollection; ++i) {
+		struct hid_collection *collection = &hdev->collection[i];
+		hid_dbg(hdev, "c:%d t:0x%x u:0x%x l:0x%x\n",
+				 i, collection->type, collection->usage,
+				collection->level);
+	}
+
+	hid_dbg(hdev, "report_enum[HID_INPUT_REPORT]\n");
+	report_enum = &hdev->report_enum[HID_INPUT_REPORT];
+	list_for_each_entry(report, &report_enum->report_list, list) {
+		hid_dbg(hdev, "Report id:%x\n", report->id);
+		for (i = 0; i < report->maxfield; ++i) {
+			field = report->field[i];
+			for (j = 0; j < field->maxusage; ++j) {
+				hid_dbg(hdev, "usage hid:%x c_index:%x\n",
+				field->usage[j].hid,
+				field->usage[j].collection_index);
+			}
+			hid_dbg(hdev, "units:%x expo:%x\n",
+				field->unit,
+				field->unit_exponent);
+		}
+	}
+
+	hid_dbg(hdev, "report_enum[HID_OUTPUT_REPORT]\n");
+	report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
+	list_for_each_entry(report, &report_enum->report_list, list) {
+		hid_dbg(hdev, "Report id:%x\n", report->id);
+		for (i = 0; i < report->maxfield; ++i) {
+			field = report->field[i];
+			for (j = 0; j < field->maxusage; ++j) {
+				hid_dbg(hdev, "usage hid:%x c_index:%x\n",
+				field->usage[j].hid,
+				field->usage[j].collection_index);
+			}
+			hid_dbg(hdev, "units:%x expo:%x\n",
+				field->unit,
+				field->unit_exponent);
+
+		}
+	}
+
+	hid_dbg(hdev, "report_enum[HID_FEATURE_REPORT]\n");
+	report_enum = &hdev->report_enum[HID_FEATURE_REPORT];
+	list_for_each_entry(report, &report_enum->report_list, list) {
+		hid_dbg(hdev, "Report id:%x\n", report->id);
+		for (i = 0; i < report->maxfield; ++i) {
+			field = report->field[i];
+			for (j = 0; j < field->maxusage; ++j) {
+				hid_dbg(hdev, "u hid:%x c_index:%x\n",
+				field->usage[j].hid,
+				field->usage[j].collection_index);
+			}
+			hid_dbg(hdev, "units:%x expo:%x\n",
+				field->unit,
+				field->unit_exponent);
+		}
+	}
+}
+
+static void dump_raw_data(struct hid_device *hdev, int size, u8 *pdata)
+{
+	int j = 0;
+
+	for (j = 0; j < size; ++j)
+		hid_dbg(hdev, "0x%x\n", *pdata++);
+}
+#endif
+
+static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
+					struct hid_device *hdev,
+					u32 usage_id, void **priv)
+{
+	struct hid_sensor_hub_callbacks_list *callback = NULL;
+	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
+
+
+	spin_lock(&pdata->dyn_lock);
+	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
+		if (callback->usage_id == usage_id) {
+			*priv = callback->priv;
+			spin_unlock(&pdata->dyn_lock);
+			return callback->usage_callback;
+		}
+	spin_unlock(&pdata->dyn_lock);
+	return NULL;
+}
+
+int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
+			u32 usage_id,
+			struct hid_sensor_hub_callbacks *usage_callback)
+{
+	struct hid_sensor_hub_callbacks_list *callback;
+	struct sensor_hub_data *pdata =
+		(struct sensor_hub_data *)hid_get_drvdata(hsdev->hdev);
+
+	spin_lock(&pdata->dyn_lock);
+	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
+		if (callback->usage_id == usage_id) {
+			spin_unlock(&pdata->dyn_lock);
+			return -EINVAL;
+		}
+	callback = kzalloc(sizeof(*callback), GFP_KERNEL);
+	if (!callback) {
+		spin_unlock(&pdata->dyn_lock);
+		return -ENOMEM;
+	}
+	callback->usage_callback = usage_callback;
+	callback->usage_id = usage_id;
+	callback->priv = NULL;
+	list_add_tail(&callback->list, &pdata->dyn_callback_list);
+	spin_unlock(&pdata->dyn_lock);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
+
+int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
+				u32 usage_id)
+{
+	struct hid_sensor_hub_callbacks_list *callback, *n;
+	struct sensor_hub_data *pdata =
+		(struct sensor_hub_data *)hid_get_drvdata(hsdev->hdev);
+
+	spin_lock(&pdata->dyn_lock);
+	list_for_each_entry_safe(callback, n,
+				&pdata->dyn_callback_list, list)
+		if (callback->usage_id == usage_id) {
+			list_del(&callback->list);
+			kfree(callback);
+			break;
+		}
+	spin_unlock(&pdata->dyn_lock);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
+
+int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+				u32 field_index, s32 value)
+{
+	struct hid_report *report;
+	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
+	int ret = 0;
+
+	if (report_id < 0)
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+	report = sensor_hub_feature_report(report_id, hsdev->hdev);
+	if (!report) {
+		ret = -EINVAL;
+		goto done_proc;
+	}
+	if (field_index >=  report->maxfield) {
+		ret = -EINVAL;
+		goto done_proc;
+	}
+	hid_set_field(report->field[field_index], 0, value);
+	usbhid_submit_report(hsdev->hdev, report, USB_DIR_OUT);
+	usbhid_wait_io(hsdev->hdev);
+done_proc:
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
+
+int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+				u32 field_index, s32 *value)
+{
+	struct hid_report *report;
+	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
+	int ret = 0;
+
+	if (report_id < 0)
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+	report = sensor_hub_feature_report(report_id, hsdev->hdev);
+	if (!report) {
+		ret = -EINVAL;
+		goto done_proc;
+	}
+	if (field_index >=  report->maxfield) {
+		ret = -EINVAL;
+		goto done_proc;
+	}
+	usbhid_submit_report(hsdev->hdev, report, USB_DIR_IN);
+	usbhid_wait_io(hsdev->hdev);
+	*value = report->field[field_index]->value[0];
+done_proc:
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
+
+
+int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
+					u32 usage_id,
+					u32 attr_usage_id, u32 report_id)
+{
+	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
+	struct sensor_hub_pending *work;
+	unsigned long flags;
+	struct hid_report *report;
+	int ret_val = 0;
+
+	if (report_id < 0)
+		return -EINVAL;
+
+	work = kzalloc(sizeof(*work), GFP_KERNEL);
+	if (!work)
+		return ret_val;
+
+	init_completion(&work->ready);
+	work->usage_id = usage_id;
+	work->attr_usage_id = attr_usage_id;
+	work->raw_size = 0;
+
+	mutex_lock(&data->mutex);
+	spin_lock_irqsave(&data->lock, flags);
+	data->pending = work;
+	report = sensor_hub_in_report(report_id, hsdev->hdev);
+	if (!report)
+		goto err_free;
+	usbhid_submit_report(hsdev->hdev, report, USB_DIR_IN);
+	spin_unlock_irqrestore(&data->lock, flags);
+	wait_for_completion_interruptible_timeout(&work->ready, HZ*5);
+	if (work->raw_size)
+		ret_val = *(u32 *)work->raw_data;
+
+err_free:
+	data->pending = NULL;
+	mutex_unlock(&data->mutex);
+
+	kfree(work);
+	return ret_val;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
+
+int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
+				u8 type,
+				u32 usage_id,
+				u32 attr_usage_id,
+				struct hid_sensor_hub_attribute_info *info)
+{
+	int ret = -1;
+	int i, j;
+	int collection_index = -1;
+	struct hid_report *report;
+	struct hid_field *field;
+	struct hid_report_enum *report_enum;
+	struct hid_device *hdev = hsdev->hdev;
+
+	/* Initialize with defaults */
+	info->usage_id = usage_id;
+	info->attrib_id =  attr_usage_id;
+	info->report_id = -1;
+	info->index = -1;
+	info->units = -1;
+	info->unit_expo = -1;
+
+	for (i = 0; i < hdev->maxcollection; ++i) {
+		struct hid_collection *collection = &hdev->collection[i];
+		if (usage_id == collection->usage) {
+			collection_index = i;
+			break;
+		}
+	}
+	if (collection_index == -1)
+		goto err_ret;
+
+	report_enum = &hdev->report_enum[type];
+	list_for_each_entry(report, &report_enum->report_list, list) {
+		for (i = 0; i < report->maxfield; ++i) {
+			field = report->field[i];
+			for (j = 0; j < field->maxusage; ++j) {
+				if (field->usage[j].hid == attr_usage_id &&
+					field->usage[j].collection_index ==
+					collection_index)  {
+					info->index = i;
+					info->report_id = report->id;
+					info->units = field->unit;
+					info->unit_expo = field->unit_exponent;
+					info->size = field->report_size/8;
+					break;
+				}
+			}
+		}
+	}
+err_ret:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
+
+struct hid_sensor_common_attributes *sensor_hub_allocate_common_attributes(
+			struct hid_sensor_hub_device *hsdev, unsigned usage_id)
+{
+	int ret;
+	struct hid_sensor_common_attributes *st;
+
+	st = kzalloc(sizeof(struct hid_sensor_common_attributes), GFP_KERNEL);
+	if (st == NULL) {
+		hid_err(hsdev->hdev, "Mem Allocation Failure\n");
+		goto error_ret;
+	}
+	st->hsdev = hsdev;
+	st->usage_id = usage_id;
+	ret = sensor_hub_input_get_attribute_info(hsdev,
+					HID_FEATURE_REPORT, usage_id,
+					HID_SENSOR_POLLING, &st->poll);
+
+	ret = sensor_hub_input_get_attribute_info(hsdev,
+					HID_FEATURE_REPORT, usage_id,
+					HID_SENSOR_REPORT_STATE,
+					&st->report_state);
+
+	ret = sensor_hub_input_get_attribute_info(hsdev,
+					HID_FEATURE_REPORT, usage_id,
+					HID_SENSOR_POWER_STATE,
+					&st->power_state);
+
+	ret = sensor_hub_input_get_attribute_info(hsdev,
+			HID_FEATURE_REPORT, usage_id,
+			HID_USAGE_SENSOR_PROPERTY_CHANGE_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 st;
+
+error_ret:
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_allocate_common_attributes);
+
+void sensor_hub_free_common_attributes(
+		struct hid_sensor_common_attributes *attrb)
+{
+	kfree(attrb);
+}
+EXPORT_SYMBOL_GPL(sensor_hub_free_common_attributes);
+
+ssize_t hid_sensor_read_samp_freq(struct hid_sensor_common_attributes *attrb,
+					int buf_len, char *buf)
+{
+	__s32 value;
+	int len;
+	int ret;
+	int conv_value;
+
+	ret = sensor_hub_get_feature(attrb->hsdev,
+			attrb->poll.report_id,
+			attrb->poll.index, &value);
+	if (ret < 0 || value <= 0)
+		len = sprintf(buf, "0\n");
+	else {
+		if (attrb->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
+			conv_value = 1000/value;
+		else if (attrb->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+			conv_value = 1/value;
+		else
+			conv_value = value; /*Assume HZ*/
+		len = sprintf(buf, "%d\n", conv_value);
+	}
+	return len;
+}
+EXPORT_SYMBOL_GPL(hid_sensor_read_samp_freq);
+
+ssize_t hid_sensor_write_samp_freq(struct hid_sensor_common_attributes *attrb,
+					int buf_len, const char *buf)
+{
+	int value;
+	int conv_value;
+	int ret;
+
+	if (kstrtoint(buf, 10, &value) < 0)
+		return -EINVAL;
+
+	if (value > MAXIMUM_SAMP_FREQUENCY)
+		value = MAXIMUM_SAMP_FREQUENCY;
+
+	if (value && attrb->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
+		conv_value = 1000/value;
+	else if (value && attrb->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
+		conv_value = 1/value;
+	else
+		conv_value = value; /*Assume HZ*/
+
+	ret = sensor_hub_set_feature(attrb->hsdev,
+		attrb->poll.report_id,
+		attrb->poll.index,
+		conv_value);
+
+	if (ret < 0)
+		return ret;
+	return strlen(buf);
+}
+EXPORT_SYMBOL_GPL(hid_sensor_write_samp_freq);
+
+ssize_t hid_sensor_read_hyst_raw(struct hid_sensor_common_attributes *attrb,
+				int buf_len, char *buf)
+{
+	__s32 value;
+	int len;
+	int ret;
+
+	ret = sensor_hub_get_feature(attrb->hsdev,
+		attrb->sensitivity.report_id,
+		attrb->sensitivity.index, &value);
+	if (ret < 0 || value < 0) {
+		len = sprintf(buf, "0\n");
+		hid_err(attrb->hsdev->hdev, "Failed\n");
+	} else
+		len = sprintf(buf, "units:%d,exp:%d,value:%d\n",
+				attrb->sensitivity.units,
+				attrb->sensitivity.unit_expo, value);
+	return len;
+}
+EXPORT_SYMBOL_GPL(hid_sensor_read_hyst_raw);
+
+ssize_t hid_sensor_write_hyst_raw(struct hid_sensor_common_attributes *attrb,
+					int buf_len, const char *buf)
+{
+	int value;
+	int ret;
+
+	if (kstrtoint(buf, 10, &value) < 0)
+		return -EINVAL;
+
+	if (value <= 0)
+		value = 0;
+	ret = sensor_hub_set_feature(attrb->hsdev,
+		attrb->sensitivity.report_id,
+		attrb->sensitivity.index,
+		value);
+
+	if (ret < 0)
+		return ret;
+
+	return strlen(buf);
+}
+EXPORT_SYMBOL_GPL(hid_sensor_write_hyst_raw);
+
+ssize_t hid_sensor_write_report_state(
+			struct hid_sensor_common_attributes *attrb,
+			int buf_len, const char *buf)
+{
+	int value;
+	int ret;
+
+	if (kstrtoint(buf, 10, &value) < 0)
+		return -EINVAL;
+
+	if (value <= 0)
+		value = 0;
+	ret = sensor_hub_set_feature(attrb->hsdev,
+		attrb->report_state.report_id,
+		attrb->report_state.index,
+		value);
+
+	if (ret < 0)
+		return ret;
+	return strlen(buf);
+}
+EXPORT_SYMBOL_GPL(hid_sensor_write_report_state);
+
+ssize_t hid_sensor_write_power_state(
+				struct hid_sensor_common_attributes *attrb,
+				int buf_len, const char *buf)
+{
+	int value;
+	int ret;
+
+	if (kstrtoint(buf, 10, &value) < 0)
+		return -EINVAL;
+
+	if (value <= 0)
+		value = 0;
+	ret = sensor_hub_set_feature(attrb->hsdev,
+		attrb->power_state.report_id,
+		attrb->power_state.index,
+		value);
+
+	if (ret < 0)
+		return ret;
+
+	return strlen(buf);
+}
+EXPORT_SYMBOL_GPL(hid_sensor_write_power_state);
+
+
+#ifdef CONFIG_PM
+static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
+{
+	struct sensor_hub_data *pdata =  hid_get_drvdata(hdev);
+	struct hid_sensor_hub_callbacks_list *callback;
+
+	hid_dbg(hdev, " sensor_hub_suspend\n");
+	spin_lock(&pdata->dyn_lock);
+	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
+		if (callback->initialized && callback->usage_callback->suspend)
+			callback->usage_callback->suspend(
+					pdata->hsdev, callback->priv);
+	}
+	spin_unlock(&pdata->dyn_lock);
+	return 0;
+}
+
+static int sensor_hub_resume(struct hid_device *hdev)
+{
+	struct sensor_hub_data *pdata =  hid_get_drvdata(hdev);
+	struct hid_sensor_hub_callbacks_list *callback;
+
+	hid_dbg(hdev, " sensor_hub_resume\n");
+	spin_lock(&pdata->dyn_lock);
+	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
+		if (callback->initialized && callback->usage_callback->resume)
+			callback->usage_callback->resume(
+					pdata->hsdev, callback->priv);
+	}
+	spin_unlock(&pdata->dyn_lock);
+	return 0;
+}
+
+static int sensor_hub_reset_resume(struct hid_device *hdev)
+{
+	return 0;
+}
+#endif
+/*
+ * Handle raw report as sent by device
+ */
+static int sensor_hub_raw_event(struct hid_device *hdev,
+		struct hid_report *report, u8 *raw_data, int size)
+{
+	int i;
+	u8 *ptr;
+	int sz;
+	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
+	unsigned long flags;
+	struct hid_sensor_hub_callbacks *callback = NULL;
+	struct hid_collection *collection = NULL;
+	void *priv = NULL;
+
+	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
+			 report->id, size, report->type);
+	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
+#if (defined CONFIG_HID_SENSOR_HUB_DEBUG) || \
+	(defined CONFIG_HID_SENSOR_HUB_DEBUG_MODULE)
+	dump_raw_data(hdev, size, raw_data);
+#endif
+	if (report->type != HID_INPUT_REPORT)
+		return 1;
+
+	ptr = raw_data;
+	ptr++; /*Skip report id*/
+
+	if (!report)
+		goto err_report;
+
+	spin_lock_irqsave(&pdata->lock, flags);
+
+	for (i = 0; i < report->maxfield; ++i) {
+
+		hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
+				i, report->field[i]->usage->collection_index,
+				report->field[i]->usage->hid,
+				report->field[i]->report_size/8);
+
+		sz = report->field[i]->report_size/8;
+		if (pdata->pending && pdata->pending->attr_usage_id ==
+				report->field[i]->usage->hid) {
+			hid_dbg(hdev, "data was pending ...\n");
+			sz = (sz > RAW_BUFFER_SIZE) ? RAW_BUFFER_SIZE : sz;
+			memcpy(pdata->pending->raw_data, ptr, sz);
+			pdata->pending->raw_size  = sz;
+			complete(&pdata->pending->ready);
+		}
+		collection = &hdev->collection[
+				report->field[i]->usage->collection_index];
+		hid_dbg(hdev, "collection->usage %x\n",
+					collection->usage);
+		callback = sensor_hub_get_callback(pdata->hsdev->hdev,
+							collection->usage,
+							&priv);
+		if (callback && callback->capture_sample) {
+			callback->capture_sample(pdata->hsdev,
+			report->field[i]->usage->hid, sz, ptr, callback->pdev);
+		}
+		ptr += sz;
+	}
+	if (callback && collection && callback->send_event)
+		callback->send_event(pdata->hsdev, collection->usage,
+					callback->pdev);
+
+	spin_unlock_irqrestore(&pdata->lock, flags);
+
+err_report:
+	return 1;
+}
+
+static int sensor_hub_probe(struct hid_device *hdev,
+				const struct hid_device_id *id)
+{
+	int ret;
+	struct sensor_hub_data *sd;
+	int i;
+	char *name;
+
+	sd = kzalloc(sizeof(struct sensor_hub_data), GFP_KERNEL);
+	if (!sd) {
+		hid_err(hdev, "cannot allocate Sensor data\n");
+		return -ENOMEM;
+	}
+	sd->hsdev = kzalloc(sizeof(struct hid_sensor_hub_device), GFP_KERNEL);
+	if (!sd->hsdev) {
+		hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
+		ret = -ENOMEM;
+		goto err_free_hub;
+	}
+	hid_set_drvdata(hdev, sd);
+	sd->hsdev->hdev = hdev;
+	spin_lock_init(&sd->lock);
+	spin_lock_init(&sd->dyn_lock);
+	mutex_init(&sd->mutex);
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "parse failed\n");
+		goto err_free;
+	}
+#if (defined CONFIG_HID_SENSOR_HUB_DEBUG) || \
+	(defined CONFIG_HID_SENSOR_HUB_DEBUG_MODULE)
+	dump_report(hdev);
+#endif
+	if (sensor_hub_check_for_sensor_page(hdev) < 0) {
+		hid_err(hdev, "sensor page not found\n");
+		goto err_free;
+	}
+	INIT_LIST_HEAD(&hdev->inputs);
+
+	hdev->claimed = HID_CLAIMED_INPUT;
+	ret = hid_hw_start(hdev, 0);
+	if (ret) {
+		hid_err(hdev, "hw start failed\n");
+		goto err_free;
+	}
+	ret = hid_hw_open(hdev);
+	if (ret) {
+		hid_err(hdev, "failed to open input interrupt pipe\n");
+		goto err_stop_hw;
+	}
+
+	INIT_LIST_HEAD(&sd->dyn_callback_list);
+	hid_sensor_client_cnt = 0;
+	for (i = 0; i < hdev->maxcollection && i < MAX_HUB_SENSORS ; ++i) {
+		struct hid_collection *collection = &hdev->collection[i];
+		name = kmalloc(MAX_DRIVER_NAME_SIZE+1, GFP_KERNEL);
+		if (name  == NULL) {
+			hid_err(hdev,
+				"memory alloc failed for MFD device name\n");
+			ret = -ENOMEM;
+			goto err_close;
+		}
+		snprintf(name, MAX_DRIVER_NAME_SIZE, "HID-SENSOR-%x",
+							collection->usage);
+		hid_sensor_hub_client_devs[i].name = name;
+		hid_sensor_hub_client_devs[i].platform_data = &sd->hsdev;
+		hid_sensor_hub_client_devs[i].pdata_size = sizeof(sd->hsdev);
+		hid_dbg(hdev, "Adding %s:%x\n", name, (unsigned int)sd);
+		hid_sensor_client_cnt++;
+	}
+	ret = mfd_add_devices(&hdev->dev, 0, hid_sensor_hub_client_devs,
+		hid_sensor_client_cnt, NULL, 0);
+	if (ret < 0) {
+		for (i = 0; i < hid_sensor_client_cnt ; ++i)
+			kfree(hid_sensor_hub_client_devs[i].name);
+		goto err_close;
+	}
+	return ret;
+
+err_close:
+	hid_hw_stop(hdev);
+	hid_hw_close(hdev);
+err_stop_hw:
+	hid_hw_stop(hdev);
+err_free:
+	kfree(sd->hsdev);
+err_free_hub:
+	kfree(sd);
+
+	return ret;
+}
+
+static void sensor_hub_remove(struct hid_device *hdev)
+{
+	struct sensor_hub_data *data = hid_get_drvdata(hdev);
+	unsigned long flags;
+	int i;
+
+	hid_dbg(hdev, " hardware removed\n");
+	hdev->claimed &= ~HID_CLAIMED_INPUT;
+	hid_hw_stop(hdev);
+	hid_hw_close(hdev);
+	spin_lock_irqsave(&data->lock, flags);
+	if (data->pending)
+		complete(&data->pending->ready);
+	spin_unlock_irqrestore(&data->lock, flags);
+	mfd_remove_devices(&hdev->dev);
+	for (i = 0; i < hid_sensor_client_cnt ; ++i)
+		kfree(hid_sensor_hub_client_devs[i].name);
+	hid_set_drvdata(hdev, NULL);
+	mutex_destroy(&data->mutex);
+	kfree(data->hsdev);
+	kfree(data);
+}
+
+static const struct hid_device_id sensor_hub_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8086,
+			USB_DEVICE_ID_SENSOR_HUB_1020) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8087,
+			USB_DEVICE_ID_SENSOR_HUB_1020) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8086,
+			USB_DEVICE_ID_SENSOR_HUB_09FA) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8087,
+			USB_DEVICE_ID_SENSOR_HUB_09FA) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
+			USB_DEVICE_ID_SENSOR_HUB_7014) },
+	{ }
+};
+
+static const struct hid_usage_id sensor_hub_grabbed_usages[] = {
+	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
+	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 }
+};
+
+static struct hid_driver sensor_hub_driver = {
+	.name = "hid-sensor-hub",
+	.id_table = sensor_hub_devices,
+	.probe = sensor_hub_probe,
+	.remove = sensor_hub_remove,
+	.raw_event = sensor_hub_raw_event,
+#ifdef CONFIG_PM
+	.suspend = sensor_hub_suspend,
+	.resume =  sensor_hub_resume,
+	.reset_resume =  sensor_hub_reset_resume,
+#endif
+};
+
+static int __init sensor_hub_init(void)
+{
+	return hid_register_driver(&sensor_hub_driver);
+}
+
+static void __exit sensor_hub_exit(void)
+{
+	hid_unregister_driver(&sensor_hub_driver);
+}
+
+module_init(sensor_hub_init);
+module_exit(sensor_hub_exit);
+
+MODULE_DESCRIPTION("HID Sensor Hub driver");
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
new file mode 100644
index 0000000..f7ce790
--- /dev/null
+++ b/include/linux/hid-sensor-hub.h
@@ -0,0 +1,99 @@
+/*
+ * 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_SENSORS_HUB_H
+#define _HID_SENSORS_HUB_H
+
+#include <linux/hid.h>
+#include <linux/hid-sensor-ids.h>
+
+struct hid_sensor_hub_attribute_info {
+	u32 usage_id;
+	u32 attrib_id;
+	s32 report_id;
+	s32 index;
+	s32 units;
+	s32 unit_expo;
+	s32 size;
+};
+
+struct hid_sensor_common_attributes {
+	struct hid_sensor_hub_device *hsdev;
+	unsigned usage_id;
+	struct hid_sensor_hub_attribute_info poll;
+	struct hid_sensor_hub_attribute_info report_state;
+	struct hid_sensor_hub_attribute_info power_state;
+	struct hid_sensor_hub_attribute_info sensitivity;
+};
+
+struct hid_sensor_hub_device {
+	struct hid_device *hdev;
+};
+
+
+struct hid_sensor_hub_callbacks {
+	struct platform_device *pdev;
+	int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
+	int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
+	int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
+			u32 usage_id, size_t raw_len, char *raw_data,
+			void *priv);
+	int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
+			 void *priv);
+};
+
+/* Registeration functions */
+int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
+			u32 usage_id,
+			struct hid_sensor_hub_callbacks *usage_callback);
+int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
+			u32 usage_id);
+
+/* Hid sensor hub core interfaces */
+int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
+			u8 type,
+			u32 usage_id, u32 attr_usage_id,
+			struct hid_sensor_hub_attribute_info *info);
+int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
+			u32 usage_id,
+			u32 attr_usage_id, u32 report_id);
+int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+			u32 field_index, s32 value);
+int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+			u32 field_index, s32 *value);
+
+struct hid_sensor_common_attributes *sensor_hub_allocate_common_attributes(
+			struct hid_sensor_hub_device *hsdev,
+			unsigned usage_id);
+void sensor_hub_free_common_attributes(
+			struct hid_sensor_common_attributes *attrb);
+ssize_t hid_sensor_read_samp_freq(struct hid_sensor_common_attributes *attrb,
+			int buf_len, char *buf);
+ssize_t hid_sensor_write_samp_freq(struct hid_sensor_common_attributes *attrb,
+			int buf_len, const char *buf);
+ssize_t hid_sensor_read_hyst_raw(struct hid_sensor_common_attributes *attrb,
+			int buf_len, char *buf);
+ssize_t hid_sensor_write_hyst_raw(struct hid_sensor_common_attributes *attrb,
+			int buf_len, const char *buf);
+ssize_t hid_sensor_write_report_state(
+			struct hid_sensor_common_attributes *attrb,
+			int buf_len, const char *buf);
+ssize_t hid_sensor_write_power_state(
+			struct hid_sensor_common_attributes *attrb,
+			int buf_len, const char *buf);
+#endif
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
new file mode 100644
index 0000000..34cc779
--- /dev/null
+++ b/include/linux/hid-sensor-ids.h
@@ -0,0 +1,116 @@
+/*
+ * 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_SENSORS_IDS_H
+#define _HID_SENSORS_IDS_H
+
+#define HID_UP_SENSOR		0x00200000
+#define HID_SENSOR_POLLING      0x0020030E
+#define HID_SENSOR_REPORT_STATE 0x00200316
+#define HID_SENSOR_POWER_STATE  0x00200319
+
+
+/* Accel 3D (200073) */
+#define HID_USAGE_SENSOR_ACCEL_3D				0x200073
+#define HID_USAGE_SENSOR_DATA_MOTION_ACCELERATION_X_AXIS	0x200453
+#define HID_USAGE_SENSOR_DATA_MOTION_ACCELERATION_Y_AXIS	0x200454
+#define HID_USAGE_SENSOR_DATA_MOTION_ACCELERATION_Z_AXIS	0x200455
+
+/* ALS (200041) */
+#define HID_USAGE_SENSOR_ALS				        0x200041
+#define HID_USAGE_SENSOR_DATA_LIGHT_ILLUMINANCE			0x2004d1
+
+/* Compass 3D: (200083) */
+
+/* Gyro 3D: (200076) */
+#define HID_USAGE_SENSOR_GYRO_3D				0x200076
+#define HID_USAGE_SENSOR_DATA_MOTION_ANGULAR_VELOCITY_X_AXIS	0x200457
+#define HID_USAGE_SENSOR_DATA_MOTION_ANGULAR_VELOCITY_Y_AXIS	0x200458
+#define HID_USAGE_SENSOR_DATA_MOTION_ANGULAR_VELOCITY_Z_AXIS	0x200459
+
+/*ORIENTATION: Compass 3D: (200083) */
+#define HID_USAGE_SENSOR_COMPASS_3D				0x200083
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_HEADING	0x200471
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_HEADING_X	0x200472
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_HEADING_Y	0x200473
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_HEADING_Z	0x200474
+
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_COMPENSATED_MAGNETIC_NORTH 0x200475
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_COMPENSATED_TRUE_NORTH 0x200476
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_NORTH	0x200477
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_TRUE_NORTH		0x200478
+
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_DISTANCE		0x200479
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_DISTANCE_X		0x20047A
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_DISTANCE_Y		0x20047B
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_DISTANCE_Z		0x20047C
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_DISTANCE_OUT_OF_RANGE 0x20047D
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_TILT			0x20047E
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_TILT_X		0x20047F
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_TILT_Y		0x200480
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_TILT_Z		0x200481
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_ROTATION_MATRIX	0x200482
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_QUATERNION		0x200483
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_FLUX		0x200484
+
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_FLUX_X_AXIS	0x200485
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_FLUX_Y_AXIS	0x200486
+#define HID_USAGE_SENSOR_DATA_ORIENTATION_MAGNETIC_FLUX_Z_AXIS	0x200487
+
+/* Units */
+#define HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED			0x00
+#define HID_USAGE_SENSOR_UNITS_LUX				0x01
+#define HID_USAGE_SENSOR_UNITS_KELVIN				0x01000100
+#define HID_USAGE_SENSOR_UNITS_FAHRENHEIT			0x03000100
+#define HID_USAGE_SENSOR_UNITS_PASCAL				0xF1E1
+#define HID_USAGE_SENSOR_UNITS_NEWTON				0x11E1
+#define HID_USAGE_SENSOR_UNITS_METERS_PER_SECOND		0x11F0
+#define HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD		0x11E0
+#define HID_USAGE_SENSOR_UNITS_FARAD				0xE14F2000
+#define HID_USAGE_SENSOR_UNITS_AMPERE				0x01001000
+#define HID_USAGE_SENSOR_UNITS_WATT				0x21d1
+#define HID_USAGE_SENSOR_UNITS_HENRY				0x21E1E000
+#define HID_USAGE_SENSOR_UNITS_OHM				0x21D1E000
+#define HID_USAGE_SENSOR_UNITS_VOLT				0x21D1F000
+#define HID_USAGE_SENSOR_UNITS_HERTZ				0x01F0
+#define HID_USAGE_SENSOR_UNITS_DEGREES_PER_SEC_SQRD		0x14E0
+#define HID_USAGE_SENSOR_UNITS_RADIANS				0x12
+#define HID_USAGE_SENSOR_UNITS_RADIANS_PER_SECOND		0x12F0
+#define HID_USAGE_SENSOR_UNITS_RADIANS_PER_SEC_SQRD		0x12E0
+#define HID_USAGE_SENSOR_UNITS_SECOND				0x0110
+#define HID_USAGE_SENSOR_UNITS_GAUSS				0x01E1F000
+#define HID_USAGE_SENSOR_UNITS_GRAM				0x0101
+#define HID_USAGE_SENSOR_UNITS_CENTIMETER			0x11
+#define HID_USAGE_SENSOR_UNITS_G				0x1A
+#define HID_USAGE_SENSOR_UNITS_MILLISECOND			0x19
+#define HID_USAGE_SENSOR_UNITS_PERCENT				0x17
+#define HID_USAGE_SENSOR_UNITS_DEGREES				0x14
+#define HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND		0x15
+
+/* Common selectors */
+#define HID_USAGE_SENSOR_PROPERTY_REPORT_INTERVAL		0x20030E
+#define HID_USAGE_SENSOR_PROPERTY_CHANGE_SENSITIVITY_ABS	0x20030F
+#define HID_USAGE_SENSOR_PROPERTY_CHANGE_SENSITIVITY_RANGE_PCT	0x200310
+#define HID_USAGE_SENSOR_PROPERTY_CHANGE_SENSITIVITY_REL_PCT	0x200311
+#define HID_USAGE_SENSOR_PROPERTY_ACCURACY			0x200312
+#define HID_USAGE_SENSOR_PROPERTY_RESOLUTION			0x200313
+#define HID_USAGE_SENSOR_PROPERTY_RANGE_MAXIMUM			0x200314
+#define HID_USAGE_SENSOR_PROPERTY_RANGE_MINIMUM			0x200315
+#define HID_USAGE_SENSOR_PROPERTY_REPORTING_STATE		0x200316
+
+#endif
-- 
1.7.7.6