v4.19.13 snapshot.
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
new file mode 100644
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+++ b/include/linux/hid-sensor-hub.h
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+/*
+ * 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>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.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.
+ * @logical_minimum: Logical minimum value for this attribute.
+ * @logical_maximum: Logical maximum value for this attribute.
+ */
+struct hid_sensor_hub_attribute_info {
+ u32 usage_id;
+ u32 attrib_id;
+ s32 report_id;
+ s32 index;
+ s32 units;
+ s32 unit_expo;
+ s32 size;
+ s32 logical_minimum;
+ s32 logical_maximum;
+};
+
+/**
+ * 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 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.
+ * @usage: Usage id for this hub device instance.
+ * @start_collection_index: Starting index for a phy type collection
+ * @end_collection_index: Last index for a phy type collection
+ * @mutex_ptr: synchronizing mutex pointer.
+ * @pending: Holds information of pending sync read request.
+ */
+struct hid_sensor_hub_device {
+ struct hid_device *hdev;
+ u32 vendor_id;
+ u32 product_id;
+ u32 usage;
+ int start_collection_index;
+ int end_collection_index;
+ struct mutex *mutex_ptr;
+ struct sensor_hub_pending pending;
+};
+
+/**
+ * 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);
+};
+
+/**
+* sensor_hub_device_open() - Open hub device
+* @hsdev: Hub device instance.
+*
+* Used to open hid device for sensor hub.
+*/
+int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
+
+/**
+* sensor_hub_device_clode() - Close hub device
+* @hsdev: Hub device instance.
+*
+* Used to clode hid device for sensor hub.
+*/
+void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
+
+/* 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
+* @hsdev: Hub device instance.
+* @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
+* @flag: Synchronous or asynchronous read
+* @is_signed: If true then fields < 32 bits will be sign-extended
+*
+* Issues a synchronous or asynchronous read request for an input attribute.
+* Returns data upto 32 bits.
+*/
+
+enum sensor_hub_read_flags {
+ SENSOR_HUB_SYNC,
+ SENSOR_HUB_ASYNC,
+};
+
+int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ u32 attr_usage_id, u32 report_id,
+ enum sensor_hub_read_flags flag,
+ bool is_signed
+);
+
+/**
+* sensor_hub_set_feature() - Feature set request
+* @hsdev: Hub device instance.
+* @report_id: Report id to look for
+* @field_index: Field index inside a report
+* @buffer_size: size of the buffer
+* @buffer: buffer to use in the feature 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, int buffer_size, void *buffer);
+
+/**
+* sensor_hub_get_feature() - Feature get request
+* @hsdev: Hub device instance.
+* @report_id: Report id to look for
+* @field_index: Field index inside a report
+* @buffer_size: size of the buffer
+* @buffer: buffer to copy output
+*
+* Used to get a field in feature report. For example this can get polling
+* interval, sensitivity, activate/deactivate state. On success it returns
+* number of bytes copied to buffer. On failure, it returns value < 0.
+*/
+int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+ u32 field_index, int buffer_size, void *buffer);
+
+/* hid-sensor-attributes */
+
+/* Common hid sensor iio structure */
+struct hid_sensor_common {
+ struct hid_sensor_hub_device *hsdev;
+ struct platform_device *pdev;
+ unsigned usage_id;
+ atomic_t data_ready;
+ atomic_t user_requested_state;
+ atomic_t runtime_pm_enable;
+ int poll_interval;
+ int raw_hystersis;
+ int latency_ms;
+ struct iio_trigger *trigger;
+ int timestamp_ns_scale;
+ 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_attribute_info report_latency;
+ struct work_struct work;
+};
+
+/* Convert from hid unit expo to regular exponent */
+static inline int hid_sensor_convert_exponent(int unit_expo)
+{
+ if (unit_expo < 0x08)
+ return unit_expo;
+ else if (unit_expo <= 0x0f)
+ return -(0x0f-unit_expo+1);
+ else
+ return 0;
+}
+
+int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
+ u32 usage_id,
+ struct hid_sensor_common *st);
+int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
+ int val1, int val2);
+int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
+ int *val1, int *val2);
+int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
+ int val1, int val2);
+int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
+ int *val1, int *val2);
+
+int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
+ u32 report_id, int field_index, u32 usage_id);
+
+int hid_sensor_format_scale(u32 usage_id,
+ struct hid_sensor_hub_attribute_info *attr_info,
+ int *val0, int *val1);
+
+s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
+
+int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
+ int64_t raw_value);
+bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st);
+int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency);
+int hid_sensor_get_report_latency(struct hid_sensor_common *st);
+
+#endif