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