diff options
Diffstat (limited to 'zephyr/program/skyrim/winterhold/src/fan.c')
| -rw-r--r-- | zephyr/program/skyrim/winterhold/src/fan.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/zephyr/program/skyrim/winterhold/src/fan.c b/zephyr/program/skyrim/winterhold/src/fan.c new file mode 100644 index 0000000000..a5061a660f --- /dev/null +++ b/zephyr/program/skyrim/winterhold/src/fan.c @@ -0,0 +1,90 @@ +/* Copyright 2023 The ChromiumOS Authors + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "console.h" +#include "fan.h" +#include "math_util.h" +#include "thermal.h" + +#include <zephyr/kernel.h> + +#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ##args) +#define CPRINTF(format, args...) cprintf(CC_THERMAL, format, ##args) + +K_TIMER_DEFINE(grace_period_timer, NULL, NULL); + +enum fan_status board_override_fan_control_duty(int ch) +{ + int duty, rpm_diff, deviation, duty_step; + struct fan_data *data = &fan_data[ch]; + int rpm_actual = data->rpm_actual; + int rpm_target = data->rpm_target; + + /* This works with one fan only. */ + if (ch != 0) { + CPRINTS("Only FAN0 is supported!"); + return FAN_STATUS_FRUSTRATED; + } + + /* Wait for fan RPM to catch up after its duty has been changed. */ + if (k_timer_remaining_ticks(&grace_period_timer) != 0) + return FAN_STATUS_LOCKED; + + duty = fan_get_duty(ch); + if (duty == 0 && rpm_target == 0) + return FAN_STATUS_STOPPED; + + /* + * If the current RPM is close enough to the target just leave it. + * It's always going to fluctuate a bit anyway. + */ + deviation = fans[ch].rpm->rpm_deviation * rpm_target / 100; + rpm_diff = rpm_target - rpm_actual; + if (rpm_diff > deviation) { + /* Can't set duty higher than 100%... */ + if (duty == 100) + return FAN_STATUS_FRUSTRATED; + } else if (rpm_diff < -deviation) { + /* Can't set duty lower than 1%... */ + if (duty == 1 && rpm_target != 0) + return FAN_STATUS_FRUSTRATED; + } else { + return FAN_STATUS_LOCKED; + } + + /* + * The rpm_diff -> duty_step conversion is specific to a specific + * whiterun fan. + * It has been determined empirically. + */ + if (ABS(rpm_diff) >= 2500) { + duty_step = 35; + k_timer_start(&grace_period_timer, K_MSEC(800), K_NO_WAIT); + } else if (ABS(rpm_diff) >= 2000) { + duty_step = 28; + k_timer_start(&grace_period_timer, K_MSEC(800), K_NO_WAIT); + } else if (ABS(rpm_diff) >= 1000) { + duty_step = 14; + k_timer_start(&grace_period_timer, K_MSEC(800), K_NO_WAIT); + } else if (ABS(rpm_diff) >= 500) { + duty_step = 6; + k_timer_start(&grace_period_timer, K_MSEC(800), K_NO_WAIT); + } else if (ABS(rpm_diff) >= 250) { + duty_step = 3; + k_timer_start(&grace_period_timer, K_MSEC(600), K_NO_WAIT); + } else { + duty_step = 1; + k_timer_start(&grace_period_timer, K_MSEC(600), K_NO_WAIT); + } + + if (rpm_diff > 0) + duty = MIN(duty + duty_step, 100); + else + duty = MAX(duty - duty_step, 1); + + fan_set_duty(ch, duty); + + return FAN_STATUS_CHANGING; +} |