HID: sensors: introduce sensor framework

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@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 160 insertions, 0 deletions

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
+* @report_id:	Report id to look for
+* @field_index:	Field index inside a report
+* @value:	Place holder for return value
+*
+* Used to get a field in feature report. For example this can get polling
+* interval, sensitivity, activate/deactivate state.
+*/
+int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
+			u32 field_index, s32 *value);
+#endif