name : cros_ec_sensors_core.h /* 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 */