1 files changed, 140 insertions, 0 deletions
diff --git a/board/gaelin/thermal.c b/board/gaelin/thermal.c
new file mode 100644
index 0000000000..e15e0043e1
--- /dev/null
+++ b/board/gaelin/thermal.c
@@ -0,0 +1,140 @@
+/* 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 "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 1~4 trigger point, set -1 if we're not using this
+	 * sensor to determine fan speed.
+	 */
+	int8_t on[TEMP_SENSOR_COUNT];
+	/*
+	 * Sensor 1~4 trigger point, set -1 if we're not using this
+	 * sensor to determine fan speed.
+	 */
+	int8_t off[TEMP_SENSOR_COUNT];
+	/* Fan rpm */
+	int16_t rpm[FAN_CH_COUNT];
+};
+
+static const struct fan_step fan_table[] = {
+	{
+		/* level 0 */
+		.on = { 65, -1, -1, -1 },
+		.off = { 0, -1, -1, -1 },
+		.rpm = { 2350 },
+	},
+	{
+		/* level 1 */
+		.on = { 80, -1, -1, -1 },
+		.off = { 60, -1, -1, -1 },
+		.rpm = { 2350 },
+	},
+	{
+		/* level 2 */
+		.on = { 87, -1, -1, -1 },
+		.off = { 75, -1, -1, -1 },
+		.rpm = { 3250 },
+	},
+	{
+		/* level 3 */
+		.on = { 91, -1, -1, -1 },
+		.off = { 82, -1, -1, -1 },
+		.rpm = { 3750 },
+	},
+	{
+		/* level 4 */
+		.on = { 100, -1, -1, -1 },
+		.off = { 86, -1, -1, -1 },
+		.rpm = { 4100 },
+	},
+};
+const int num_fan_levels = ARRAY_SIZE(fan_table);
+
+int fan_table_to_rpm(int fan, int *temp, enum temp_sensor_id temp_sensor)
+{
+	/* current fan level */
+	static int current_level;
+	/* previous fan level */
+	static int prev_current_level;
+	/* previous sensor temperature */
+	static int prev_temp[TEMP_SENSOR_COUNT];
+	int i;
+	int new_rpm = 0;
+
+	/*
+	 * 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_sensor] < prev_temp[temp_sensor]) {
+		for (i = current_level; i > 0; i--) {
+			if (temp[temp_sensor] < fan_table[i].off[temp_sensor])
+				current_level = i - 1;
+			else
+				break;
+		}
+	} else if (temp[temp_sensor] > prev_temp[temp_sensor]) {
+		for (i = current_level; i < num_fan_levels; i++) {
+			if (temp[temp_sensor] > fan_table[i].on[temp_sensor])
+				current_level = i + 1;
+			else
+				break;
+		}
+	}
+
+	if (current_level < 0)
+		current_level = 0;
+	if (current_level >= num_fan_levels)
+		current_level = num_fan_levels - 1;
+
+	if (current_level != prev_current_level) {
+		CPRINTS("temp: %d, prev_temp: %d", temp[temp_sensor],
+			prev_temp[temp_sensor]);
+		CPRINTS("current_level: %d", current_level);
+	}
+
+	prev_temp[temp_sensor] = temp[temp_sensor];
+	prev_current_level = current_level;
+
+	switch (fan) {
+	case FAN_CH_0:
+		new_rpm = fan_table[current_level].rpm[FAN_CH_0];
+		break;
+	default:
+		break;
+	}
+
+	return new_rpm;
+}
+
+void board_override_fan_control(int fan, int *temp)
+{
+	if (chipset_in_state(CHIPSET_STATE_ON)) {
+		fan_set_rpm_mode(FAN_CH(fan), 1);
+		fan_set_rpm_target(FAN_CH(fan),
+				   fan_table_to_rpm(FAN_CH(fan), temp,
+						    TEMP_SENSOR_1_CPU));
+	} else if (chipset_in_state(CHIPSET_STATE_ANY_SUSPEND)) {
+		/* Stop fan when enter S0ix */
+		fan_set_rpm_mode(FAN_CH(fan), 1);
+		fan_set_rpm_target(FAN_CH(fan), 0);
+	}
+}