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/* 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
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