---
drivers/hid/Kconfig | 14 +
drivers/hid/Makefile | 1 +
drivers/hid/hid-sensor-hub.c | 681 ++++++++++++++++++++++++++++++++++++++++
include/linux/hid-sensor-hub.h | 160 ++++++++++
include/linux/hid-sensor-ids.h | 111 +++++++
5 files changed, 967 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 bef04c1..a9fd774 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -653,6 +653,20 @@ 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 creates a MFD instance
+ for a sensor hub and identifies all the sensors connected to it.
+ Each sensor is registered as a MFD cell, so that sensor specific
+ processing can be done in a separate driver. Each sensor
+ drivers can use the service provided by this driver to register
+ for events and handle data streams. Each sensor driver can format
+ data and present to user mode using input or IIO interface.
+
endmenu
endif # HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index ca6cc9f..08f9d8f 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -87,6 +87,7 @@ 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..6c9f0f8
--- /dev/null
+++ b/drivers/hid/hid-sensor-hub.c
@@ -0,0 +1,681 @@
+/*
+ * 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"
+
+/**
+ * struct sensor_hub_pending - Synchronous read pending information
+ * @status: Pending status true/false.
+ * @ready: Completion synchronization data.
+ * @usage_id: Usage id for physical device, E.g. Gyro usage id.
+ * @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
+ * @raw_size: Response size for a read request.
+ * @raw_data: Place holder for received response.
+ */
+struct sensor_hub_pending {
+ bool status;
+ struct completion ready;
+ u32 usage_id;
+ u32 attr_usage_id;
+ int raw_size;
+ u8 *raw_data;
+};
+
+/**
+ * struct sensor_hub_data - Hold a instance data for a HID hub device
+ * @hs_dev: Stored hid instance for current hub device.
+ * @mutex: Mutex to serialize synchronous request.
+ * @lock: Spin lock to protect pending request structure.
+ * @pending: Holds information of pending sync read request.
+ * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
+ * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
+ */
+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 mfd_cell *hid_sensor_hub_client_devs;
+ int hid_sensor_client_cnt;
+};
+
+/**
+ * hid_sensor_hub_callbacks_list - Stores callback list
+ * @list: list head.
+ * @usage_id: usage id for a physical device.
+ * @usage_callbacks: Stores registered callback functions.
+ * @priv: Private data for a physical device.
+ */
+struct hid_sensor_hub_callbacks_list {
+ struct list_head list;
+ u32 usage_id;
+ struct hid_sensor_hub_callbacks *usage_callback;
+ void *priv;
+};
+
+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 hid_report *report;
+
+ list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
+ if (report->id == id)
+ return report;
+ }
+ hid_warn(hdev, "No report with id 0x%x found\n", id);
+
+ return NULL;
+}
+
+static int sensor_hub_get_physical_device_count(
+ struct hid_report_enum *report_enum)
+{
+ struct hid_report *report;
+ struct hid_field *field;
+ int cnt = 0;
+
+ list_for_each_entry(report, &report_enum->report_list, list) {
+ field = report->field[0];
+ if (report->maxfield && field &&
+ field->physical)
+ cnt++;
+ }
+
+ return cnt;
+}
+
+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;
+ 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 = 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;
+ struct sensor_hub_data *pdata = 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) {
+ 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_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
+ if (!report || (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_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
+ if (!report || (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);
+ unsigned long flags;
+ struct hid_report *report;
+ int ret_val = 0;
+
+ if (report_id < 0)
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+ memset(&data->pending, 0, sizeof(data->pending));
+ init_completion(&data->pending.ready);
+ data->pending.usage_id = usage_id;
+ data->pending.attr_usage_id = attr_usage_id;
+ data->pending.raw_size = 0;
+
+ spin_lock_irqsave(&data->lock, flags);
+ data->pending.status = true;
+ report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
+ if (!report) {
+ spin_unlock_irqrestore(&data->lock, flags);
+ goto err_free;
+ }
+ usbhid_submit_report(hsdev->hdev, report, USB_DIR_IN);
+ spin_unlock_irqrestore(&data->lock, flags);
+ wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
+ switch (data->pending.raw_size) {
+ case 1:
+ ret_val = *(u8 *)data->pending.raw_data;
+ break;
+ case 2:
+ ret_val = *(u16 *)data->pending.raw_data;
+ break;
+ case 4:
+ ret_val = *(u32 *)data->pending.raw_data;
+ break;
+ default:
+ ret_val = 0;
+ }
+ kfree(data->pending.raw_data);
+
+err_free:
+ data->pending.status = false;
+ mutex_unlock(&data->mutex);
+
+ 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];
+ if (field->physical == usage_id &&
+ field->logical == attr_usage_id) {
+ info->index = i;
+ info->report_id = report->id;
+ info->units = field->unit;
+ info->unit_expo = field->unit_exponent;
+ info->size = field->report_size/8;
+ ret = 0;
+ } else {
+ 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;
+ ret = 0;
+ break;
+ }
+ }
+ }
+ if (ret == 0)
+ break;
+ }
+ }
+
+err_ret:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
+
+#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->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->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 (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.status && pdata->pending.attr_usage_id ==
+ report->field[i]->usage->hid) {
+ hid_dbg(hdev, "data was pending ...\n");
+ pdata->pending.raw_data = kmalloc(sz, GFP_KERNEL);
+ if (pdata->pending.raw_data) {
+ memcpy(pdata->pending.raw_data, ptr, sz);
+ pdata->pending.raw_size = sz;
+ } else
+ pdata->pending.raw_size = 0;
+ 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,
+ report->field[i]->physical,
+ &priv);
+ if (callback && callback->capture_sample) {
+ if (report->field[i]->logical)
+ callback->capture_sample(pdata->hsdev,
+ report->field[i]->logical, sz, ptr,
+ callback->pdev);
+ else
+ 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;
+ struct hid_report *report;
+ struct hid_report_enum *report_enum;
+ struct hid_field *field;
+ int dev_cnt;
+
+ 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;
+ sd->hsdev->vendor_id = hdev->vendor;
+ sd->hsdev->product_id = hdev->product;
+ 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 (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);
+ sd->hid_sensor_client_cnt = 0;
+ report_enum = &hdev->report_enum[HID_INPUT_REPORT];
+
+ dev_cnt = sensor_hub_get_physical_device_count(report_enum);
+ sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt *
+ sizeof(struct mfd_cell),
+ GFP_KERNEL);
+ if (sd->hid_sensor_hub_client_devs == NULL) {
+ hid_err(hdev,
+ "Failed to allocate memory for mfd cells\n");
+ ret = -ENOMEM;
+ goto err_close;
+ }
+ list_for_each_entry(report, &report_enum->report_list, list) {
+ hid_dbg(hdev, "Report id:%x\n", report->id);
+ field = report->field[0];
+ if (report->maxfield && field &&
+ field->physical) {
+ name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x",
+ field->physical);
+ if (name == NULL) {
+ hid_err(hdev,
+ "Failed MFD device name\n");
+ ret = -ENOMEM;
+ goto err_free_cells;
+ }
+ sd->hid_sensor_hub_client_devs[
+ sd->hid_sensor_client_cnt].name = name;
+ sd->hid_sensor_hub_client_devs[
+ sd->hid_sensor_client_cnt].platform_data =
+ sd->hsdev;
+ sd->hid_sensor_hub_client_devs[
+ sd->hid_sensor_client_cnt].pdata_size =
+ sizeof(*sd->hsdev);
+ hid_dbg(hdev, "Adding %s:%x\n", name,
+ (unsigned int)sd);
+ sd->hid_sensor_client_cnt++;
+ }
+ }
+ ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs,
+ sd->hid_sensor_client_cnt, NULL, 0);
+ if (ret < 0)
+ goto err_free_names;
+
+ return ret;
+
+err_free_names:
+ for (i = 0; i < sd->hid_sensor_client_cnt ; ++i)
+ kfree(sd->hid_sensor_hub_client_devs[i].name);
+err_free_cells:
+ kfree(sd->hid_sensor_hub_client_devs);
+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.status)
+ complete(&data->pending.ready);
+ spin_unlock_irqrestore(&data->lock, flags);
+ mfd_remove_devices(&hdev->dev);
+ for (i = 0; i < data->hid_sensor_client_cnt ; ++i)
+ kfree(data->hid_sensor_hub_client_devs[i].name);
+ kfree(data->hid_sensor_hub_client_devs);
+ 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@xxxxxxxxx>");
+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..0aa5f4c
--- /dev/null
+++ b/include/linux/hid-sensor-hub.h
@@ -0,0 +1,160 @@
+/*
+ * 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 - Attribute info
+ * @usage_id: Parent usage id of a physical device.
+ * @attrib_id: Attribute id for this attribute.
+ * @report_id: Report id in which this information resides.
+ * @index: Field index in the report.
+ * @units: Measurment unit for this attribute.
+ * @unit_expo: Exponent used in the data.
+ * @size: Size in bytes for data size.
+ */
+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_hub_device - Stores the hub instance data
+ * @hdev: Stores the hid instance.
+ * @vendor_id: Vendor id of hub device.
+ * @product_id: Product id of hub device.
+ */
+struct hid_sensor_hub_device {
+ struct hid_device *hdev;
+ u32 vendor_id;
+ u32 product_id;
+};
+
+/**
+ * struct hid_sensor_hub_callbacks - Client callback functions
+ * @pdev: Platform device instance of the client driver.
+ * @suspend: Suspend callback.
+ * @resume: Resume callback.
+ * @capture_sample: Callback to get a sample.
+ * @send_event: Send notification to indicate all samples are
+ * captured, process and send event
+ */
+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);
+};
+
+/* Registration functions */
+
+/**
+* sensor_hub_register_callback() - Register client callbacks
+* @hsdev: Hub device instance.
+* @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
+* @usage_callback: Callback function storage
+*
+* Used to register callbacks by client processing drivers. Sensor
+* hub core driver will call these callbacks to offload processing
+* of data streams and notifications.
+*/
+int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ struct hid_sensor_hub_callbacks *usage_callback);
+
+/**
+* sensor_hub_remove_callback() - Remove client callbacks
+* @hsdev: Hub device instance.
+* @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
+*
+* If there is a callback registred, this call will remove that
+* callbacks, so that it will stop data and event notifications.
+*/
+int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id);
+
+
+/* Hid sensor hub core interfaces */
+
+/**
+* sensor_hub_input_get_attribute_info() - Get an attribute information
+* @hsdev: Hub device instance.
+* @type: Type of this attribute, input/output/feature
+* @usage_id: Attribute usage id of parent physical device as per spec
+* @attr_usage_id: Attribute usage id as per spec
+* @info: return information about attribute after parsing report
+*
+* Parses report and returns the attribute information such as report id,
+* field index, units and exponet etc.
+*/
+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);
+
+/**
+* sensor_hub_input_attr_get_raw_value() - Synchronous read request
+* @usage_id: Attribute usage id of parent physical device as per spec
+* @attr_usage_id: Attribute usage id as per spec
+* @report_id: Report id to look for
+*
+* Issues a synchronous read request for an input attribute. Returns
+* data upto 32 bits. Since client can get events, so this call should
+* not be used for data paths, this will impact performance.
+*/
+
+int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ u32 attr_usage_id, u32 report_id);
+/**
+* sensor_hub_set_feature() - Feature set request
+* @report_id: Report id to look for
+* @field_index: Field index inside a report
+* @value: Value to set
+*
+* Used to set a field in feature report. For example this can set polling
+* interval, sensitivity, activate/deactivate state.
+*/
+int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+ u32 field_index, s32 value);
+
+/**
+* sensor_hub_get_feature() - Feature get request
