/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* ChromeOS EC sensor hub
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*
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* Copyright (C) 2016 Google, Inc
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*/
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#ifndef __CROS_EC_SENSORS_CORE_H
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#define __CROS_EC_SENSORS_CORE_H
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#include <linux/iio/iio.h>
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#include <linux/irqreturn.h>
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#include <linux/platform_data/cros_ec_commands.h>
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#include <linux/platform_data/cros_ec_proto.h>
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#include <linux/platform_data/cros_ec_sensorhub.h>
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enum {
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CROS_EC_SENSOR_X,
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CROS_EC_SENSOR_Y,
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CROS_EC_SENSOR_Z,
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CROS_EC_SENSOR_MAX_AXIS,
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};
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/* EC returns sensor values using signed 16 bit registers */
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#define CROS_EC_SENSOR_BITS 16
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/*
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* 4 16 bit channels are allowed.
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* Good enough for current sensors, they use up to 3 16 bit vectors.
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*/
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#define CROS_EC_SAMPLE_SIZE (sizeof(s64) * 2)
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typedef irqreturn_t (*cros_ec_sensors_capture_t)(int irq, void *p);
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/**
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* struct cros_ec_sensors_core_state - state data for EC sensors IIO driver
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* @ec: cros EC device structure
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* @cmd_lock: lock used to prevent simultaneous access to the
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* commands.
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* @msg: cros EC command structure
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* @param: motion sensor parameters structure
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* @resp: motion sensor response structure
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* @type: type of motion sensor
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* @loc: location where the motion sensor is placed
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* @range_updated: True if the range of the sensor has been
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* updated.
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* @curr_range: If updated, the current range value.
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* It will be reapplied at every resume.
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* @calib: calibration parameters. Note that trigger
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* captured data will always provide the calibrated
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* data
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* @samples: static array to hold data from a single capture.
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* For each channel we need 2 bytes, except for
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* the timestamp. The timestamp is always last and
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* is always 8-byte aligned.
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* @read_ec_sensors_data: function used for accessing sensors values
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* @fifo_max_event_count: Size of the EC sensor FIFO
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* @frequencies: Table of known available frequencies:
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* 0, Min and Max in mHz
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*/
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struct cros_ec_sensors_core_state {
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struct cros_ec_device *ec;
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struct mutex cmd_lock;
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struct cros_ec_command *msg;
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struct ec_params_motion_sense param;
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struct ec_response_motion_sense *resp;
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enum motionsensor_type type;
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enum motionsensor_location loc;
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bool range_updated;
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int curr_range;
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struct calib_data {
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s16 offset;
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u16 scale;
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} calib[CROS_EC_SENSOR_MAX_AXIS];
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s8 sign[CROS_EC_SENSOR_MAX_AXIS];
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u8 samples[CROS_EC_SAMPLE_SIZE] __aligned(8);
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int (*read_ec_sensors_data)(struct iio_dev *indio_dev,
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unsigned long scan_mask, s16 *data);
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u32 fifo_max_event_count;
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int frequencies[6];
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};
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int cros_ec_sensors_read_lpc(struct iio_dev *indio_dev, unsigned long scan_mask,
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s16 *data);
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int cros_ec_sensors_read_cmd(struct iio_dev *indio_dev, unsigned long scan_mask,
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s16 *data);
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struct platform_device;
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int cros_ec_sensors_core_init(struct platform_device *pdev,
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struct iio_dev *indio_dev, bool physical_device,
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cros_ec_sensors_capture_t trigger_capture,
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cros_ec_sensorhub_push_data_cb_t push_data,
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bool has_hw_fifo);
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irqreturn_t cros_ec_sensors_capture(int irq, void *p);
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int cros_ec_sensors_push_data(struct iio_dev *indio_dev,
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s16 *data,
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s64 timestamp);
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int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *st,
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u16 opt_length);
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int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask);
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int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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const int **vals,
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int *type,
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int *length,
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long mask);
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int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask);
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extern const struct dev_pm_ops cros_ec_sensors_pm_ops;
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/* List of extended channel specification for all sensors. */
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extern const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[];
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#endif /* __CROS_EC_SENSORS_CORE_H */
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