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walnux/include/nuttx/sensors/sensor.h
Xiang Xiao 43f57240e0 Replece clock_gettime(CLOCK_MONOTONIC) with clock_systime_timespec 
it's better to call the kernrel api insteaad user space api in kernel

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2022-02-24 01:06:36 +08:00

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/****************************************************************************
* include/nuttx/sensors/sensor.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_SENSORS_SENSOR_H
#define __INCLUDE_NUTTX_SENSORS_SENSOR_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <nuttx/sensors/ioctl.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* sensor type definition */
/* Custom Sensor
* Some special sensor whose event size is not fixed or dynamically change,
* are called sensor of custom type. You should treat its events as byte
* streams and use sensor_custom_register to register character device
* with specific path, ex: "/dev/sensor/custom_dummy".
*/
#define SENSOR_TYPE_CUSTOM 0
/* Accelerometer
* All values are in SI units (m/s^2), and measure the acceleration of the
* device minus the acceleration dut to gravity.
*/
#define SENSOR_TYPE_ACCELEROMETER 1
/* Magneric Field
* All values are in micro-Tesla (uT) and measure the geomagnetic field
* in X, Y and Z axis.
*/
#define SENSOR_TYPE_MAGNETIC_FIELD 2
/* Gyroscope
* All values are in radians/second and measure the rate of rotation around
* the X, Y and Z axis.
*/
#define SENSOR_TYPE_GYROSCOPE 3
/* Ambient Light
* The ambient light sensor value is returned in SI units lux.
*/
#define SENSOR_TYPE_LIGHT 4
/* Barometer
* All values are in hectopascal (hPa) and measure the athmospheric pressure.
* You can calculate altitude by perssure.
*/
#define SENSOR_TYPE_BAROMETER 5
/* Proximity
* The values correspond to the distance to the nearest
* object in centimeters.
*/
#define SENSOR_TYPE_PROXIMITY 6
/* Relative Humidity
* A relative humidity sensor measure relative ambient air humidity and
* return a value in percent.
*/
#define SENSOR_TYPE_RELATIVE_HUMIDITY 7
/* Ambient Temperature
* The ambient (room) temperature in degree Celsius
*/
#define SENSOR_TYPE_AMBIENT_TEMPERATURE 8
/* RGB
* We use these values of RGB to weighted to obtain the color of LED.
* These values is in unit percent.
*/
#define SENSOR_TYPE_RGB 9
/* Hall
* All values are in bool type (0 or 1) and it often is used to as switch.
* A values of 1 indicates that switch on.
*/
#define SENSOR_TYPE_HALL 10
/* IR (Infrared Ray)
* This sensor can detect a human approach and outputs a signal from
* interrupt pins. This sensor value is in lux.
*/
#define SENSOR_TYPE_IR 11
/* GPS
* A sensor of this type returns gps data. Include latitude, longitude,
* altitude, horizontal position accuracy, vertical position accuracy,
* horizontal dilution of precision, vertical dilution of precision...
*/
#define SENSOR_TYPE_GPS 12
/* Ultraviolet light sensor
* This sensor can identify the UV index in ambient light help people
* to effectively protect themselves from sunburns, cancer or eye damage.
* This value range is 0 - 15.
*/
#define SENSOR_TYPE_ULTRAVIOLET 13
/* Noise Loudness
* A sensor of this type returns the loudness of noise in SI units (db)
*/
#define SENSOR_TYPE_NOISE 14
/* PM25
* A sensor of this type returns the content of pm2.5 in the air
* This value is in SI units (ug/m^3)
*/
#define SENSOR_TYPE_PM25 15
/* PM1P0
* A sensor of this type returns the content of pm1.0 in the air
* This value is in SI units (ug/m^3)
*/
#define SENSOR_TYPE_PM1P0 16
/* PM10
* A sensor of this type returns the content of pm10 in the air
* This value is in SI units (ug/m^3)
*/
#define SENSOR_TYPE_PM10 17
/* CO2
* A sensor of this type returns the content of CO2 in the air
* This value is in units (ppm-part per million).
*/
#define SENSOR_TYPE_CO2 18
/* HCHO
* The HCHO pollution is an important indicator of household air
* pollution. This value is in units (ppm-part per million).
*/
#define SENSOR_TYPE_HCHO 19
/* TVOC (total volatile organic compounds)
* The indoor TVOC is cause indoor air pollution is one of the
* main reasons why. This value is in units (ppb-part per billion).
*/
#define SENSOR_TYPE_TVOC 20
/* PH
* The acid-base degree describes the strength of the aqueous
* solution, expressed by pH. In the thermodynamic standard
* condition, the aqueous solution with pH=7 is neutral,
* pH<7 is acidic, and pH>7 is alkaline.
*/
#define SENSOR_TYPE_PH 21
/* Dust
* A sensor of this type returns the content of dust in the air
* values is in ug/m^3.
*/
#define SENSOR_TYPE_DUST 22
/* Heart Rate
* A sensor of this type returns the current heart rate.
* Current heart rate is in beats per minute (BPM).
*/
#define SENSOR_TYPE_HEART_RATE 23
/* Heart Beat
* A sensor of this type returns an event evetytime
* a hear beat peek is detected. Peak here ideally corresponds
* to the positive peak in the QRS complex of and ECG signal.
*/
#define SENSOR_TYPE_HEART_BEAT 24
/* ECG (Electrocardiogram)
* A sensor of this type returns the ECG voltage in μV. Sensors may amplify
* the input ECG signal. Here the ECG voltage is the un-amplified ECG
* voltage.
*/
#define SENSOR_TYPE_ECG 25
/* PPG Dual (2-channel photoplethysmography)
* A sensor of this type returns the 2 channels PPG measurements in ADC
* counts and their corresponding LED current and ADC gains. The PPG
* measurements come from photodiodes and following current amplifiers and
* ADCs, where a photodiode switches reflected light intensity to current.
* The LED current decides the lightness of LED, which is the input of PPG
* measurements. The ADC gains are multipled on the output and affect SNR.
*/
#define SENSOR_TYPE_PPGD 26
/* PPG Quad (4-channel photoplethysmography)
* A sensor of this type returns the 4 channels PPG measurements in ADC
* counts and their corresponding LED current and ADC gains. The PPG
* measurements come from photodiodes and following current amplifiers and
* ADCs, where a photodiode switches reflected light intensity to current.
* The LED current decides the lightness of LED, which is the input of PPG
* measurements. The ADC gains are multipled on the output and affect SNR.
*/
#define SENSOR_TYPE_PPGQ 27
/* Imdepance
* A sensor of this type returns the impedance measurements. An impedance
* is a complex number, which consists of a real part(resistance) and an
* imaginary part(reactance). Both of them are in uint Ohm(Ω).
*/
#define SENSOR_TYPE_IMPEDANCE 28
/* OTS (Optical tracking sensor)
* A sensor of this type returns the OTS measurements in counts. It
* integrates an optical chip and a LASER light source in a single miniature
* package. It provies wide depth of field range on glossy surface, and
* design flexibility into a compact device.
*/
#define SENSOR_TYPE_OTS 29
/* Sensor of gps satellite
* A sensor of this type returns the gps satellite information.
*/
#define SENSOR_TYPE_GPS_SATELLITE 30
/* The total number of sensor */
#define SENSOR_TYPE_COUNT 31
/****************************************************************************
* Inline Functions
****************************************************************************/
static inline uint64_t sensor_get_timestamp(void)
{
struct timespec ts;
clock_systime_timespec(&ts);
return 1000000ull * ts.tv_sec + ts.tv_nsec / 1000;
}
/****************************************************************************
* Public Types
****************************************************************************/
/* These structures prefixed with sensor_event are sensor data, and member
* that are not used must be written as NAN or INT_MIN/INT_MAX, than
* reported.
*/
struct sensor_event_accel /* Type: Accerometer */
{
uint64_t timestamp; /* Units is microseconds */
float x; /* Axis X in m/s^2 */
float y; /* Axis Y in m/s^2 */
float z; /* Axis Z in m/s^2 */
float temperature; /* Temperature in degrees celsius */
};
struct sensor_event_gyro /* Type: Gyroscope */
{
uint64_t timestamp; /* Units is microseconds */
float x; /* Axis X in rad/s */
float y; /* Axis Y in rad/s */
float z; /* Axis Z in rad/s */
float temperature; /* Temperature in degrees celsius */
};
struct sensor_event_mag /* Type: Magnetic Field */
{
uint64_t timestamp; /* Units is microseconds */
float x; /* Axis X in Gauss or micro Tesla (uT) */
float y; /* Axis Y in Gauss or micro Tesla (uT) */
float z; /* Axis Z in Gauss or micro Tesla (uT) */
float temperature; /* Temperature in degrees celsius */
};
struct sensor_event_baro /* Type: Barometer */
{
uint64_t timestamp; /* Units is microseconds */
float pressure; /* pressure measurement in millibar or hpa */
float temperature; /* Temperature in degrees celsius */
};
struct sensor_event_prox /* Type: proximity */
{
uint64_t timestamp; /* Units is microseconds */
float proximity; /* distance to the nearest object in centimeters */
};
struct sensor_event_light /* Type: Light */
{
uint64_t timestamp; /* Units is microseconds */
float light; /* in SI lux units */
};
struct sensor_event_humi /* Type: Relative Humidity */
{
uint64_t timestamp; /* Units is microseconds */
float humidity; /* in percent */
};
struct sensor_event_temp /* Type: Ambient Temperature */
{
uint64_t timestamp; /* Units is microseconds */
float temperature; /* Temperature in degrees celsius */
};
struct sensor_event_rgb /* Type: RGB */
{
uint64_t timestamp; /* Units is microseconds */
float r; /* Units is percent */
float g; /* Units is percent */
float b; /* Units is percent */
};
struct sensor_event_hall /* Type: HALL */
{
uint64_t timestamp; /* Units is microseconds */
bool hall; /* Boolean type */
};
struct sensor_event_ir /* Type: Infrared Ray */
{
uint64_t timestamp; /* Units is microseconds */
float ir; /* in SI units lux */
};
struct sensor_event_gps /* Type: Gps */
{
uint64_t timestamp; /* Time since system start, Units is microseconds */
/* This is the timestamp which comes from the gps module. It might be
* unavailable right after cold start, indicated by a value of 0,
* Units is microseconds
*/
uint64_t time_utc;
float latitude; /* Unit is degrees */
float longitude; /* Unit is degrees */
float altitude; /* Altitude above MSL(mean seal level), Unit is SI m */
float altitude_ellipsoid; /* Altitude bove Ellipsoid, Unit is SI m */
float eph; /* GPS horizontal position accuracy (metres) */
float epv; /* GPS vertical position accuracy (metres) */
float hdop; /* Horizontal dilution of precision */
float vdop; /* Vertical dilution of precision */
float ground_speed; /* GPS ground speed, Unit is m/s */
/* Course over ground (NOT heading, but direction of movement),
* Unit is Si degrees
*/
float course;
uint32_t satellites_used; /* Number of satellites used */
};
struct sensor_event_uv /* Type: Ultraviolet Light */
{
uint64_t timestamp; /* Units is microseconds */
float uvi; /* the value range is 0 - 15 */
};
struct sensor_event_noise /* Type: Noise Loudness */
{
uint64_t timestamp; /* Units is microseconds */
float db; /* in SI units db */
};
struct sensor_event_pm25 /* Type: PM25 */
{
uint64_t timestamp; /* Units is microseconds */
float pm25; /* in SI units ug/m^3 */
};
struct sensor_event_pm10 /* Type: PM10 */
{
uint64_t timestamp; /* Units is microseconds */
float pm10; /* in SI units ug/m^3 */
};
struct sensor_event_pm1p0 /* Type: PM1P0 */
{
uint64_t timestamp; /* Units is microseconds */
float pm1p0; /* in SI units ug/m^3 */
};
struct sensor_event_co2 /* Type: CO2 */
{
uint64_t timestamp; /* Units is microseconds */
float co2; /* in SI units ppm */
};
struct sensor_event_hcho /* Type: HCHO */
{
uint64_t timestamp; /* Units is microseconds */
float hcho; /* in SI units ppm */
};
struct sensor_event_tvoc /* Type: TVOC */
{
uint64_t timestamp; /* Units is microseconds */
float tvoc; /* in SI units ppm */
};
struct sensor_event_ph /* Type: PH */
{
uint64_t timestamp; /* Units is microseconds */
float ph; /* PH = 7.0 neutral, PH < 7.0 acidic, PH > 7.0 alkaline */
};
struct sensor_event_dust /* Type: DUST */
{
uint64_t timestamp; /* Units is microseconds */
float dust; /* is SI units ug/m^3 */
};
struct sensor_event_hrate /* Type: Heart Rate */
{
uint64_t timestamp; /* Units is microseconds */
float bpm; /* is SI units BPM */
};
struct sensor_event_hbeat /* Type: Heart Beat */
{
uint64_t timestamp; /* Units is microseconds */
float beat; /* Units is times/minutes */
};
struct sensor_event_ecg /* Type: ECG */
{
uint64_t timestamp; /* Unit is microseconds */
float ecg; /* Unit is μV */
};
struct sensor_event_ppgd /* Type: PPGD */
{
uint64_t timestamp; /* Unit is microseconds */
uint32_t ppg[2]; /* PPG from 2 channels. Units are ADC counts. */
uint32_t current; /* LED current. Unit is uA. */
uint16_t gain[2]; /* ADC gains of channels. Units are V/V or V/A. */
};
struct sensor_event_ppgq /* Type: PPDQ */
{
uint64_t timestamp; /* Unit is microseconds */
uint32_t ppg[4]; /* PPG from 4 channels. Units are ADC counts. */
uint32_t current; /* LED current. Unit is uA. */
uint16_t gain[4]; /* ADC gains of channels. Units are V/V or V/A. */
};
struct sensor_event_impd /* Type: Impedance */
{
uint64_t timestamp; /* Unit is microseconds */
float real; /* Real part, unit is Ohm(Ω) */
float imag; /* Imaginary part, unit is Ohm(Ω) */
};
struct sensor_event_ots /* Type: OTS */
{
uint64_t timestamp; /* Unit is microseconds */
int32_t x; /* Axis X in counts */
int32_t y; /* Axis Y in counts */
};
struct sensor_event_gps_satellite
{
uint64_t timestamp; /* Time since system start, Units is microseconds */
uint32_t count; /* Total number of messages of satellites visible */
uint32_t satellites; /* Total number of satellites in view */
struct satellite
{
uint32_t svid; /* Space vehicle ID */
/* Elevation (0: right on top of receiver,
* 90: on the horizon) of satellite
*/
uint32_t elevation;
/* Direction of satellite, 0: 0 deg, 255: 360 deg. */
uint32_t azimuth;
/* dBHz, Signal to noise ratio of satellite C/N0, range 0..99,
* zero when not tracking this satellite
*/
uint32_t snr;
}
info[4];
};
/* The sensor lower half driver interface */
struct sensor_lowerhalf_s;
struct sensor_ops_s
{
/**************************************************************************
* Name: activate
*
* Description:
* Enable or disable sensor device. when enable sensor, sensor will
* work in current mode(if not set, use default mode). when disable
* sensor, it will disable sense path and stop convert.
*
* Input Parameters:
* lower - The instance of lower half sensor driver
* enable - true(enable) and false(disable)
*
* Returned Value:
* Zero (OK) or positive on success; a negated errno value on failure.
*
**************************************************************************/
CODE int (*activate)(FAR struct sensor_lowerhalf_s *lower, bool enable);
/**************************************************************************
* Name: set_interval
*
* Description:
* Set the sensor output data period in microseconds for a given sensor.
* If *period_us > max_delay it will be truncated to max_delay and if
* *period_us < min_delay it will be replaced by min_delay.
*
* The lower-half can update update *period_us to reflect the actual
* period in case the value is rounded up to nearest supported value.
*
* Before changing the interval, you need to push the prepared data to
* ensure that they are not lost.
*
* Input Parameters:
* lower - The instance of lower half sensor driver.
* period_us - the time between samples, in us, it may be overwrite by
* lower half driver.
*
* Returned Value:
* Zero (OK) or positive on success; a negated errno value on failure.
*
**************************************************************************/
CODE int (*set_interval)(FAR struct sensor_lowerhalf_s *lower,
FAR unsigned int *period_us);
/**************************************************************************
* Name: batch
*
* Description:
* Set sensor's maximum report latency in microseconds.
*
* This function can be called while the sensor is activated,
* in which case it must not cause any sensor measurements to be lost.
* So, it is necessary to flush fifo or read ready data from data
* register to prevent data lost before you using batch mode.
*
* This sensor default mode isn't batch mode, so you need call this
* function and *latency_us != 0.
* If *latency_us > max_report_latency it will be truncated to
* max_report_latency and return *latency_us to user
* And you must flush fifo data to prevent data lost, then adjust
* latency.
*
* You can exit batch mode by call this function with *latency_us = 0.
* And you must flush fifo data to prevent data lost, then stop batch.
*
* If sensor doesn't support batching (FIFO size zero), set batch to
* NULL.
*
* You must set interval by calling set_interval before calling batch(),
* othrewise, -EINVAL is returned.
*
* The reason why you don't have flush operation is that you need to push
* the prepared data out before adjusting the latency to ensure that the
* data will not be lost.
*
* Input Parameters:
* lower - The instance of lower half sensor driver.
* latency_us - the time between batch data, in us. It may by overwrite
* by lower half driver.
*
* Returned Value:
* Zero (OK) or positive on success; a negated errno value on failure.
*
**************************************************************************/
CODE int (*batch)(FAR struct sensor_lowerhalf_s *lower,
FAR unsigned int *latency_us);
/**************************************************************************
* Name: fetch
*
* Fetch sensor register data by this function. It will use buffer of
* userspace provided and disables intermediate buffer of upper half. It's
* recommend that the lowerhalf driver writer to use this function for
* slower sensor ODR (output data rate) of sensor because this way saves
* space and it's simple.
*
* If fetch isn't NULL, upper half driver will disable intermediate
* buffer and userspace can't set buffer size by ioctl.
*
* You can call this function to read sensor register data by I2C/SPI bus
* when open mode is non-block, and poll are always successful.
* When you call this function and open mode is block, you will wait
* until sensor data ready, then read sensor data.
*
* Input Parameters:
* lower - The instance of lower half sensor driver.
* buffer - The buffer of receive sensor event, it's provided by
* file_operation::sensor_read.
* buflen - The size of buffer.
*
* Returned Value:
* The size of read buffer returned on success; a negated errno value
* on failure.
*
**************************************************************************/
CODE int (*fetch)(FAR struct sensor_lowerhalf_s *lower,
FAR char *buffer, size_t buflen);
/**************************************************************************
* Name: selftest
*
* Selftest allows for the testing of the mechanical and electrical
* portions of the sensors. When the selftest is activated, the
* electronics cause the sensors to be actuated and produce an output
* signal. The output signal is used to observe the selftest response.
* When the selftest response exceeds the min/max values,
* the part is deemed to have failed selftest.
*
* Input Parameters:
* lower - The instance of lower half sensor driver.
* arg - The parameters associated with selftest.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
**************************************************************************/
CODE int (*selftest)(FAR struct sensor_lowerhalf_s *lower,
unsigned long arg);
/**************************************************************************
* Name: set_calibvalue
*
* The calibration value to be written in or the non-volatile memory of the
* sensor or dedicated registers. At each power-on, so that the values read
* from the sensor are already corrected. When the device is calibrated,
* the absolute accuracy will be better than before.
*
* Input Parameters:
* lower - The instance of lower half sensor driver.
* arg - The parameters associated with calibration value.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
**************************************************************************/
CODE int (*set_calibvalue)(FAR struct sensor_lowerhalf_s *lower,
unsigned long arg);
/**************************************************************************
* Name: control
*
* With this method, the user can set some special config for the sensor,
* such as changing the custom mode, setting the custom resolution, reset,
* etc, which are all parsed and implemented by lower half driver.
*
* Input Parameters:
* lower - The instance of lower half sensor driver.
* cmd - The special cmd for sensor.
* arg - The parameters associated with cmd.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
* -ENOTTY - The cmd don't support.
*
**************************************************************************/
CODE int (*control)(FAR struct sensor_lowerhalf_s *lower,
int cmd, unsigned long arg);
};
/* This structure is the generic form of state structure used by lower half
* Sensor driver.
*/
struct sensor_lowerhalf_s
{
/* The type of sensor device */
int type;
/* The number of events that the circular buffer can hold.
* This sensor circular buffer is used to slove issue that application
* can't read sensor event in time. If this number of events is too large,
* the latency of sensor event will be too larage. If the number of events
* is too small, the event will be overwrite before application read them.
* So, it's recommended to set according to sensor odr. If odr is low, you
* can set to one. If odr is high, you can set to two or three.
*/
uint32_t buffer_number;
/* The number of events that hardware fifo hold maximum number of samples,
* must be aligned with size of struct sensor_event_xxx.
* If sensor don't hardware fifo, you don't need to care about fifo_size.
*/
uint32_t batch_number;
/* The uncalibrated use to describe whether the sensor event is
* uncalibrated. True is uncalibrated data, false is calibrated data,
* default false.
*/
bool uncalibrated;
/* The lower half sensor driver operations */
FAR const struct sensor_ops_s *ops;
union
{
/**********************************************************************
* Name: push_event
*
* Description:
* Lower half driver pushes a sensor event by calling this function.
* It is provided by upper half driver to lower half driver.
*
* Input Parameters:
* priv - Upper half driver handle
* data - The buffer of event, it can be all type of sensor events.
* bytes - The number of bytes of sensor event
**********************************************************************/
CODE void (*push_event)(FAR void *priv, FAR const void *data,
size_t bytes);
/**********************************************************************
* Name: notify_event
*
* Description:
* Lower half driver notifies that sensor data is ready and can be
* read by fetch. It is provided by upper half driver to lower half
* driver.
*
* This api is used when sensor_ops_s::fetch isn't NULL.
*
* Input Parameters:
* priv - Upper half driver handle
**********************************************************************/
CODE void (*notify_event)(FAR void *priv);
};
/* The private opaque pointer to be passed to upper-layer during callback */
FAR void *priv;
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* "Upper Half" Sensor Driver Interfaces
****************************************************************************/
/****************************************************************************
* Name: sensor_register
*
* Description:
* This function binds an instance of a "lower half" Sensor driver with the
* "upper half" Sensor device and registers that device so that can be used
* by application code.
*
* You can register the character device by node name format based on the
* type of sensor. Multiple types of the same type are distinguished by
* numbers. eg: accel0, accel1. This type of sensor must be less than
* SENSOR_TYPE_COUNT. This API corresponds to the sensor_unregister.
*
* Input Parameters:
* dev - A pointer to an instance of lower half sensor driver. This
* instance is bound to the sensor driver and must persist as long
* as the driver persists.
* devno - The user specifies which device of this type, from 0. If the
* devno alerady exists, -EEXIST will be returned.
*
* Returned Value:
* OK if the driver was successfully register; A negated errno value is
* returned on any failure.
*
****************************************************************************/
int sensor_register(FAR struct sensor_lowerhalf_s *dev, int devno);
/****************************************************************************
* Name: sensor_custom_register
*
* Description:
* This function binds an instance of a "lower half" Sensor driver with the
* "upper half" Sensor device and registers that device so that can be used
* by application code.
*
* You can register the character device type by specific path and esize.
* This API corresponds to the sensor_custom_unregister.
*
* Input Parameters:
* dev - A pointer to an instance of lower half sensor driver. This
* instance is bound to the sensor driver and must persist as long
* as the driver persists.
* path - The user specifies path of device. ex: /dev/sensor/xxx.
* esize - The element size of intermediate circular buffer.
*
* Returned Value:
* OK if the driver was successfully register; A negated errno value is
* returned on any failure.
*
****************************************************************************/
int sensor_custom_register(FAR struct sensor_lowerhalf_s *dev,
FAR const char *path, uint8_t esize);
/****************************************************************************
* Name: sensor_unregister
*
* Description:
* This function unregisters character node and releases all resource from
* upper half driver. This API corresponds to the sensor_register.
*
* Input Parameters:
* dev - A pointer to an instance of lower half sensor driver. This
* instance is bound to the sensor driver and must persists as long
* as the driver persists.
* devno - The user specifies which device of this type, from 0.
****************************************************************************/
void sensor_unregister(FAR struct sensor_lowerhalf_s *dev, int devno);
/****************************************************************************
* Name: sensor_custom_unregister
*
* Description:
* This function unregisters character node and releases all resource from
* upper half driver. This API corresponds to the sensor_custom_register.
*
* Input Parameters:
* dev - A pointer to an instance of lower half sensor driver. This
* instance is bound to the sensor driver and must persists as long
* as the driver persists.
* path - The user specifies path of device, ex: /dev/sensor/xxx
****************************************************************************/
void sensor_custom_unregister(FAR struct sensor_lowerhalf_s *dev,
FAR const char *path);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_NUTTX_SENSORS_SENSOR_H */
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