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linux/include/linux/hid-sensor-hub.h
Srinivas Pandruvada 138bc7969c iio: hid-sensor-hub: Implement batch mode 
HID sensor hubs using Integrated Senor Hub (ISH) has added capability to
support batch mode. This allows host processor to go to sleep for extended
duration, while the sensor hub is storing samples in its internal buffers.

'Commit f4f4673b75 ("iio: add support for hardware fifo")' implements
feature in IIO core to implement such feature. This feature is used in
bmc150-accel-core.c to implement batch mode. This implementation allows
software device buffer watermark to be used as a hint to adjust hardware
FIFO.

But HID sensor hubs don't allow to change internal buffer size of FIFOs.
Instead an additional usage id to set "maximum report latency" is defined.
This allows host to go to sleep upto this latency period without getting
any report. Since there is no ABI to set this latency, a new attribute
"hwfifo_timeout" is added so that user mode can specify a latency.

This change checks presence of usage id to get/set maximum report latency
and if present, it will expose hwfifo_timeout.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2017-05-16 19:44:01 +01:00

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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
*
* 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
);
/**
* 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;
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
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