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/* Copyright 2022 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 "fan.h"
#include "tablet_mode.h"
#include "temp_sensor/temp_sensor.h"
#include "thermal.h"
#include "util.h"
#define TEMP_MEM TEMP_SENSOR_ID(DT_NODELABEL(temp_sensor_memory))
struct fan_step {
/*
* Sensor 0~4 trigger point, set -1 if we're not using this
* sensor to determine fan speed.
*/
int on[TEMP_SENSOR_COUNT];
/*
* Sensor 0~4 release point, set -1 if we're not using this
* sensor to determine fan speed.
*/
int off[TEMP_SENSOR_COUNT];
/* Fan rpm */
uint16_t rpm[FAN_CH_COUNT];
};
#define FAN_TABLE_ENTRY(nd) \
{ \
.on = DT_PROP(nd, temp_on), \
.off = DT_PROP(nd, temp_off), \
.rpm = DT_PROP(nd, rpm_target), \
},
static const struct fan_step fan_table_clamshell[] = { DT_FOREACH_CHILD(
DT_NODELABEL(fan_steps_clamshell), FAN_TABLE_ENTRY) };
static const struct fan_step fan_table_tablet[] = { DT_FOREACH_CHILD(
DT_NODELABEL(fan_steps_tablet), FAN_TABLE_ENTRY) };
static const struct fan_step *fan_step_table;
#define NUM_FAN_LEVELS ARRAY_SIZE(fan_table_clamshell)
BUILD_ASSERT(ARRAY_SIZE(fan_table_clamshell) == ARRAY_SIZE(fan_table_tablet));
int fan_table_to_rpm(int fan, int *temp)
{
/* current fan level */
static int current_level;
/* previous sensor temperature */
static int prev_tmp[TEMP_SENSOR_COUNT];
int i;
if (tablet_get_mode())
fan_step_table = fan_table_tablet;
else
fan_step_table = fan_table_clamshell;
/*
* Compare the current and previous temperature, we have
* the three paths :
* 1. decreasing path. (check the release point)
* 2. increasing path. (check the trigger point)
* 3. invariant path. (return the current RPM)
*/
if (temp[TEMP_MEM] < prev_tmp[TEMP_MEM]) {
for (i = current_level; i > 0; i--) {
if (temp[TEMP_MEM] <= fan_step_table[i].off[TEMP_MEM])
current_level = i - 1;
else
break;
}
} else if (temp[TEMP_MEM] > prev_tmp[TEMP_MEM]) {
for (i = current_level; i < NUM_FAN_LEVELS; i++) {
if (temp[TEMP_MEM] >= fan_step_table[i].on[TEMP_MEM])
current_level = i;
else
break;
}
}
if (current_level < 0)
current_level = 0;
if (current_level >= NUM_FAN_LEVELS)
current_level = NUM_FAN_LEVELS - 1;
for (i = 0; i < TEMP_SENSOR_COUNT; ++i)
prev_tmp[i] = temp[i];
return fan_step_table[current_level].rpm[fan];
}
void board_override_fan_control(int fan, int *temp)
{
/*
* In common/fan.c pwm_fan_stop() will turn off fan
* when chipset suspend or shutdown.
*/
if (chipset_in_state(CHIPSET_STATE_ON)) {
fan_set_rpm_mode(fan, 1);
fan_set_rpm_target(fan, fan_table_to_rpm(fan, temp));
}
}
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