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hid-sensor-hub.h
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/* SPDX-License-Identifier: GPL-2.0-only */ /* * HID Sensors Driver * Copyright (c) 2012, Intel Corporation. */ #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