| /* 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 |