Quelle cros_ec_sensorhub.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Chrome OS EC MEMS Sensor Hub driver.
*
* Copyright 2019 Google LLC
*/

#ifndef __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H
#define __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H

#include <linux/ktime.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/platform_data/cros_ec_commands.h>

struct iio_dev;

/**
* struct cros_ec_sensor_platform - ChromeOS EC sensor platform information.
* @sensor_num: Id of the sensor, as reported by the EC.
*/
struct cros_ec_sensor_platform {
u8 sensor_num;
};

/**
* typedef cros_ec_sensorhub_push_data_cb_t - Callback function to send datum
*       to specific sensors.
*
* @indio_dev: The IIO device that will process the sample.
* @data: Vector array of the ring sample.
* @timestamp: Timestamp in host timespace when the sample was acquired by
*             the EC.
*/
typedef int (*cros_ec_sensorhub_push_data_cb_t)(struct iio_dev *indio_dev,
      s16 *data,
      s64 timestamp);

struct cros_ec_sensorhub_sensor_push_data {
struct iio_dev *indio_dev;
cros_ec_sensorhub_push_data_cb_t push_data_cb;
};

enum {
CROS_EC_SENSOR_LAST_TS,
CROS_EC_SENSOR_NEW_TS,
CROS_EC_SENSOR_ALL_TS
};

struct cros_ec_sensors_ring_sample {
u8  sensor_id;
u8  flag;
s16 vector[3];
s64 timestamp;
} __packed;

/* State used for cros_ec_ring_fix_overflow */
struct cros_ec_sensors_ec_overflow_state {
s64 offset;
s64 last;
};

/* Length of the filter, how long to remember entries for */
#define CROS_EC_SENSORHUB_TS_HISTORY_SIZE 64

/**
* struct cros_ec_sensors_ts_filter_state - Timestamp filetr state.
*
* @x_offset: x is EC interrupt time. x_offset its last value.
* @y_offset: y is the difference between AP and EC time, y_offset its last
*            value.
* @x_history: The past history of x, relative to x_offset.
* @y_history: The past history of y, relative to y_offset.
* @m_history: rate between y and x.
* @history_len: Amount of valid historic data in the arrays.
* @temp_buf: Temporary buffer used when updating the filter.
* @median_m: median value of m_history
* @median_error: final error to apply to AP interrupt timestamp to get the
*                "true timestamp" the event occurred.
*/
struct cros_ec_sensors_ts_filter_state {
s64 x_offset, y_offset;
s64 x_history[CROS_EC_SENSORHUB_TS_HISTORY_SIZE];
s64 y_history[CROS_EC_SENSORHUB_TS_HISTORY_SIZE];
s64 m_history[CROS_EC_SENSORHUB_TS_HISTORY_SIZE];
int history_len;

s64 temp_buf[CROS_EC_SENSORHUB_TS_HISTORY_SIZE];

s64 median_m;
s64 median_error;
};

/* struct cros_ec_sensors_ts_batch_state - State of batch of a single sensor.
*
* Use to store information to batch data using median fileter information.
*
* @penul_ts: last but one batch timestamp (penultimate timestamp).
*       Used for timestamp spreading calculations
*       when a batch shows up.
* @penul_len: last but one batch length.
* @last_ts: Last batch timestam.
* @last_len: Last batch length.
* @newest_sensor_event: Last sensor timestamp.
*/
struct cros_ec_sensors_ts_batch_state {
s64 penul_ts;
int penul_len;
s64 last_ts;
int last_len;
s64 newest_sensor_event;
};

/*
* struct cros_ec_sensorhub - Sensor Hub device data.
*
* @dev: Device object, mostly used for logging.
* @ec: Embedded Controller where the hub is located.
* @sensor_num: Number of MEMS sensors present in the EC.
* @msg: Structure to send FIFO requests.
* @params: Pointer to parameters in msg.
* @resp: Pointer to responses in msg.
* @cmd_lock : Lock for sending msg.
* @notifier: Notifier to kick the FIFO interrupt.
* @ring: Preprocessed ring to store events.
* @fifo_timestamp: Array for event timestamp and spreading.
* @fifo_info: Copy of FIFO information coming from the EC.
* @fifo_size: Size of the ring.
* @batch_state: Per sensor information of the last batches received.
* @overflow_a: For handling timestamp overflow for a time (sensor events)
* @overflow_b: For handling timestamp overflow for b time (ec interrupts)
* @filter: Medium fileter structure.
* @tight_timestamps: Set to truen when EC support tight timestamping:
*       The timestamps reported from the EC have low jitter.
*       Timestamps also come before every sample. Set either
*       by feature bits coming from the EC or userspace.
* @future_timestamp_count: Statistics used to compute shaved time.
*     This occurs when timestamp interpolation from EC
*     time to AP time accidentally puts timestamps in
*     the future. These timestamps are clamped to
*     `now` and these count/total_ns maintain the
*     statistics for how much time was removed in a
*     given period.
* @future_timestamp_total_ns: Total amount of time shaved.
* @push_data: Array of callback to send datums to iio sensor object.
*/
struct cros_ec_sensorhub {
struct device *dev;
struct cros_ec_dev *ec;
int sensor_num;

struct cros_ec_command *msg;
struct ec_params_motion_sense *params;
struct ec_response_motion_sense *resp;
struct mutex cmd_lock;  /* Lock for protecting msg structure. */

struct notifier_block notifier;

struct cros_ec_sensors_ring_sample *ring;

ktime_t fifo_timestamp[CROS_EC_SENSOR_ALL_TS];
struct ec_response_motion_sense_fifo_info *fifo_info;
int fifo_size;

struct cros_ec_sensors_ts_batch_state *batch_state;

struct cros_ec_sensors_ec_overflow_state overflow_a;
struct cros_ec_sensors_ec_overflow_state overflow_b;

struct cros_ec_sensors_ts_filter_state filter;

int tight_timestamps;

s32 future_timestamp_count;
s64 future_timestamp_total_ns;

struct cros_ec_sensorhub_sensor_push_data *push_data;
};

int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub,
      u8 sensor_num,
      struct iio_dev *indio_dev,
      cros_ec_sensorhub_push_data_cb_t cb);

void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub,
         u8 sensor_num);

int cros_ec_sensorhub_ring_allocate(struct cros_ec_sensorhub *sensorhub);
int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub);
void cros_ec_sensorhub_ring_remove(void *arg);
int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub,
           bool on);

#endif   /* __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H */

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