39 lines
832 B
C
39 lines
832 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/**
|
|
* lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
|
|
*
|
|
*/
|
|
#ifndef MINMAX_H
|
|
#define MINMAX_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* A single data point for our parameterized min-max tracker */
|
|
struct minmax_sample {
|
|
u32 t; /* time measurement was taken */
|
|
u32 v; /* value measured */
|
|
};
|
|
|
|
/* State for the parameterized min-max tracker */
|
|
struct minmax {
|
|
struct minmax_sample s[3];
|
|
};
|
|
|
|
static inline u32 minmax_get(const struct minmax *m)
|
|
{
|
|
return m->s[0].v;
|
|
}
|
|
|
|
static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
|
|
{
|
|
struct minmax_sample val = { .t = t, .v = meas };
|
|
|
|
m->s[2] = m->s[1] = m->s[0] = val;
|
|
return m->s[0].v;
|
|
}
|
|
|
|
u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
|
|
u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);
|
|
|
|
#endif
|