281 lines
8.9 KiB
C
281 lines
8.9 KiB
C
/*
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* HID Sensors Driver
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* Copyright (c) 2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef _HID_SENSORS_HUB_H
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#define _HID_SENSORS_HUB_H
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#include <linux/hid.h>
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#include <linux/hid-sensor-ids.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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/**
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* struct hid_sensor_hub_attribute_info - Attribute info
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* @usage_id: Parent usage id of a physical device.
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* @attrib_id: Attribute id for this attribute.
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* @report_id: Report id in which this information resides.
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* @index: Field index in the report.
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* @units: Measurment unit for this attribute.
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* @unit_expo: Exponent used in the data.
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* @size: Size in bytes for data size.
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* @logical_minimum: Logical minimum value for this attribute.
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* @logical_maximum: Logical maximum value for this attribute.
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*/
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struct hid_sensor_hub_attribute_info {
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u32 usage_id;
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u32 attrib_id;
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s32 report_id;
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s32 index;
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s32 units;
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s32 unit_expo;
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s32 size;
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s32 logical_minimum;
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s32 logical_maximum;
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};
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/**
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* struct sensor_hub_pending - Synchronous read pending information
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* @status: Pending status true/false.
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* @ready: Completion synchronization data.
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* @usage_id: Usage id for physical device, E.g. Gyro usage id.
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* @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
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* @raw_size: Response size for a read request.
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* @raw_data: Place holder for received response.
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*/
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struct sensor_hub_pending {
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bool status;
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struct completion ready;
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u32 usage_id;
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u32 attr_usage_id;
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int raw_size;
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u8 *raw_data;
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};
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/**
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* struct hid_sensor_hub_device - Stores the hub instance data
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* @hdev: Stores the hid instance.
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* @vendor_id: Vendor id of hub device.
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* @product_id: Product id of hub device.
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* @usage: Usage id for this hub device instance.
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* @start_collection_index: Starting index for a phy type collection
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* @end_collection_index: Last index for a phy type collection
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* @mutex_ptr: synchronizing mutex pointer.
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* @pending: Holds information of pending sync read request.
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*/
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struct hid_sensor_hub_device {
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struct hid_device *hdev;
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u32 vendor_id;
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u32 product_id;
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u32 usage;
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int start_collection_index;
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int end_collection_index;
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struct mutex *mutex_ptr;
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struct sensor_hub_pending pending;
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};
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/**
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* struct hid_sensor_hub_callbacks - Client callback functions
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* @pdev: Platform device instance of the client driver.
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* @suspend: Suspend callback.
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* @resume: Resume callback.
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* @capture_sample: Callback to get a sample.
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* @send_event: Send notification to indicate all samples are
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* captured, process and send event
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*/
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struct hid_sensor_hub_callbacks {
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struct platform_device *pdev;
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int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
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int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
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int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
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u32 usage_id, size_t raw_len, char *raw_data,
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void *priv);
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int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
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void *priv);
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};
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/**
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* sensor_hub_device_open() - Open hub device
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* @hsdev: Hub device instance.
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*
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* Used to open hid device for sensor hub.
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*/
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int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
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/**
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* sensor_hub_device_clode() - Close hub device
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* @hsdev: Hub device instance.
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*
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* Used to clode hid device for sensor hub.
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*/
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void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
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/* Registration functions */
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/**
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* sensor_hub_register_callback() - Register client callbacks
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* @hsdev: Hub device instance.
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* @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
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* @usage_callback: Callback function storage
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*
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* Used to register callbacks by client processing drivers. Sensor
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* hub core driver will call these callbacks to offload processing
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* of data streams and notifications.
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*/
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int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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struct hid_sensor_hub_callbacks *usage_callback);
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/**
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* sensor_hub_remove_callback() - Remove client callbacks
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* @hsdev: Hub device instance.
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* @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
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*
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* If there is a callback registred, this call will remove that
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* callbacks, so that it will stop data and event notifications.
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*/
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int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
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u32 usage_id);
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/* Hid sensor hub core interfaces */
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/**
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* sensor_hub_input_get_attribute_info() - Get an attribute information
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* @hsdev: Hub device instance.
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* @type: Type of this attribute, input/output/feature
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* @usage_id: Attribute usage id of parent physical device as per spec
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* @attr_usage_id: Attribute usage id as per spec
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* @info: return information about attribute after parsing report
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*
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* Parses report and returns the attribute information such as report id,
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* field index, units and exponet etc.
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*/
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int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
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u8 type,
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u32 usage_id, u32 attr_usage_id,
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struct hid_sensor_hub_attribute_info *info);
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/**
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* sensor_hub_input_attr_get_raw_value() - Synchronous read request
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* @hsdev: Hub device instance.
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* @usage_id: Attribute usage id of parent physical device as per spec
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* @attr_usage_id: Attribute usage id as per spec
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* @report_id: Report id to look for
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* @flag: Synchronous or asynchronous read
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*
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* Issues a synchronous or asynchronous read request for an input attribute.
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* Returns data upto 32 bits.
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*/
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enum sensor_hub_read_flags {
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SENSOR_HUB_SYNC,
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SENSOR_HUB_ASYNC,
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};
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int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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u32 attr_usage_id, u32 report_id,
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enum sensor_hub_read_flags flag
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);
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/**
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* sensor_hub_set_feature() - Feature set request
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* @hsdev: Hub device instance.
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* @report_id: Report id to look for
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* @field_index: Field index inside a report
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* @buffer_size: size of the buffer
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* @buffer: buffer to use in the feature set
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*
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* Used to set a field in feature report. For example this can set polling
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* interval, sensitivity, activate/deactivate state.
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*/
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int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
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u32 field_index, int buffer_size, void *buffer);
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/**
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* sensor_hub_get_feature() - Feature get request
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* @hsdev: Hub device instance.
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* @report_id: Report id to look for
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* @field_index: Field index inside a report
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* @buffer_size: size of the buffer
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* @buffer: buffer to copy output
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*
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* Used to get a field in feature report. For example this can get polling
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* interval, sensitivity, activate/deactivate state. On success it returns
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* number of bytes copied to buffer. On failure, it returns value < 0.
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*/
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int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
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u32 field_index, int buffer_size, void *buffer);
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/* hid-sensor-attributes */
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/* Common hid sensor iio structure */
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struct hid_sensor_common {
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struct hid_sensor_hub_device *hsdev;
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struct platform_device *pdev;
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unsigned usage_id;
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atomic_t data_ready;
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atomic_t user_requested_state;
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int poll_interval;
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int raw_hystersis;
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struct iio_trigger *trigger;
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int timestamp_ns_scale;
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struct hid_sensor_hub_attribute_info poll;
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struct hid_sensor_hub_attribute_info report_state;
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struct hid_sensor_hub_attribute_info power_state;
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struct hid_sensor_hub_attribute_info sensitivity;
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struct work_struct work;
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};
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/* Convert from hid unit expo to regular exponent */
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static inline int hid_sensor_convert_exponent(int unit_expo)
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{
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if (unit_expo < 0x08)
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return unit_expo;
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else if (unit_expo <= 0x0f)
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return -(0x0f-unit_expo+1);
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else
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return 0;
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}
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int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
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u32 usage_id,
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struct hid_sensor_common *st);
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int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
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int val1, int val2);
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int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
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int *val1, int *val2);
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int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
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int val1, int val2);
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int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
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int *val1, int *val2);
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int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
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u32 report_id, int field_index, u32 usage_id);
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int hid_sensor_format_scale(u32 usage_id,
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struct hid_sensor_hub_attribute_info *attr_info,
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int *val0, int *val1);
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s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
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int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
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int64_t raw_value);
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#endif
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