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/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "extpower.h"
#include "fan.h"
#include "hooks.h"
#include "host_command.h"
#include "temp_sensor.h"
#include "thermal.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_THERMAL, outstr)
#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ##args)
struct fan_step {
/*
* Sensor 1~3 trigger point, set -1 if we're not using this
* sensor to determine fan speed.
*/
int8_t on[TEMP_SENSOR_COUNT];
/*
* Sensor 1~3 trigger point, set -1 if we're not using this
* sensor to determine fan speed.
*/
int8_t off[TEMP_SENSOR_COUNT];
/* Fan rpm */
uint16_t rpm;
};
static const struct fan_step fan_step_table[] = {
{
/* level 0 */
.on = { -1, -1, 36 },
.off = { -1, -1, 99 },
.rpm = 0,
},
{
/* level 1 */
.on = { -1, -1, 40 },
.off = { -1, -1, 32 },
.rpm = 2244,
},
{
/* level 2 */
.on = { -1, -1, 45 },
.off = { -1, -1, 35 },
.rpm = 2580,
},
{
/* level 3 */
.on = { -1, -1, 50 },
.off = { -1, -1, 40 },
.rpm = 2824,
},
{
/* level 4 */
.on = { -1, -1, 55 },
.off = { -1, -1, 45 },
.rpm = 3120,
},
{
/* level 5 */
.on = { -1, -1, 60 },
.off = { -1, -1, 50 },
.rpm = 3321,
},
{
/* level 6 */
.on = { -1, -1, 70 },
.off = { -1, -1, 55 },
.rpm = 3780,
},
{
/* level 7 */
.on = { -1, -1, 80 },
.off = { -1, -1, 60 },
.rpm = 4330,
},
{
/* level 8 */
.on = { -1, -1, 99 },
.off = { -1, -1, 74 },
.rpm = 4915,
},
};
#define NUM_FAN_LEVELS ARRAY_SIZE(fan_step_table)
int fan_table_to_rpm(int fan, int *temp)
{
static int current_level;
static int prev_tmp[TEMP_SENSOR_COUNT];
int i;
/*
* Comopare the current and previous temperature, we have
* the three path:
* 1. decreasing path. (check the release point)
* 2. increasing path. (check the trigger point)
* 3. invariant path. (return the current RPM)
*/
if (temp[TEMP_SENSOR_CPU] < prev_tmp[TEMP_SENSOR_CPU]) {
if (temp[TEMP_SENSOR_CPU] <
fan_step_table[current_level].off[TEMP_SENSOR_CPU])
current_level = current_level - 1;
} else if (temp[TEMP_SENSOR_CPU] > prev_tmp[TEMP_SENSOR_CPU]) {
if (temp[TEMP_SENSOR_CPU] >
fan_step_table[current_level].on[TEMP_SENSOR_CPU])
current_level = current_level + 1;
}
if (current_level < 0)
current_level = 0;
else if (current_level > NUM_FAN_LEVELS)
current_level = NUM_FAN_LEVELS;
for (i = 0; i < TEMP_SENSOR_COUNT; i++)
prev_tmp[i] = temp[i];
return fan_step_table[current_level].rpm;
}
void board_override_fan_control(int fan, int *tmp)
{
if (chipset_in_state(CHIPSET_STATE_ON | CHIPSET_STATE_ANY_SUSPEND)) {
fan_set_rpm_mode(FAN_CH(fan), 1);
fan_set_rpm_target(FAN_CH(fan), fan_table_to_rpm(fan, tmp));
}
}
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