evoker: Dynamic changing charge current

Support dynamic changing charge current

BUG=b:259508078
BRANCH=none
TEST=check current limit setting is correct via console command
LOW_COVERAGE_REASON=test function is prepare on another CL

Change-Id: I7a21a8e13c48d957413d5367a79700f359a17a9a
Signed-off-by: Yu-An Chen <yu-an.chen@quanta.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4095162
Reviewed-by: Wai-Hong Tam <waihong@google.com>
Commit-Queue: Sam Hurst <shurst@google.com>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Reviewed-by: Sam Hurst <shurst@google.com>

2 files changed, 108 insertions, 0 deletions

diff --git a/zephyr/program/herobrine/CMakeLists.txt b/zephyr/program/herobrine/CMakeLists.txt
index 0fbb8a366f..53f642d7e6 100644
--- a/zephyr/program/herobrine/CMakeLists.txt
+++ b/zephyr/program/herobrine/CMakeLists.txt
@@ -22,6 +22,9 @@ zephyr_library_sources_ifdef(CONFIG_PLATFORM_EC_I2C
 
 if(DEFINED CONFIG_BOARD_EVOKER)
 	project(evoker)
+	zephyr_library_sources(
+		"evoker/src/charger_override.c"
+	)
 elseif(DEFINED CONFIG_BOARD_HEROBRINE)
 	project(herobrine)
 	add_subdirectory(herobrine)
diff --git a/zephyr/program/herobrine/evoker/src/charger_override.c b/zephyr/program/herobrine/evoker/src/charger_override.c
new file mode 100644
index 0000000000..daefa240a9
--- /dev/null
+++ b/zephyr/program/herobrine/evoker/src/charger_override.c
@@ -0,0 +1,105 @@
+/* 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 "battery.h"
+#include "charge_state.h"
+#include "charger.h"
+#include "console.h"
+#include "extpower.h"
+#include "temp_sensor/temp_sensor.h"
+#include "util.h"
+
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(smart_battery);
+
+/*
+ * Dynamic changing charge current.
+ */
+
+struct temp_chg_step {
+	int low; /* temp thershold ('C) to lower level*/
+	int high; /* temp thershold ('C) to higher level */
+	int current; /* charging limitation (mA) */
+};
+
+static const struct temp_chg_step temp_chg_table[] = {
+	{ .low = 0, .high = 56, .current = __INT32_MAX__ },
+	{ .low = 50, .high = 100, .current = 2000 },
+};
+#define NUM_TEMP_CHG_LEVELS ARRAY_SIZE(temp_chg_table)
+
+#undef BOARD_TEMP_TEST
+
+#ifdef BOARD_TEMP_TEST
+static int manual_temp = -1;
+#endif
+
+__override int board_charger_profile_override(struct charge_state_data *curr)
+{
+	static int current_level;
+	int charger_temp, charger_temp_c;
+
+	if (curr->state != ST_CHARGE)
+		return 0;
+
+	temp_sensor_read(TEMP_SENSOR_ID_BY_DEV(DT_NODELABEL(temp_charger)),
+			 &charger_temp);
+
+	charger_temp_c = K_TO_C(charger_temp);
+
+#ifdef BOARD_TEMP_TEST
+	if (manual_temp != -1)
+		charger_temp_c = manual_temp;
+	LOG_WRN("chg_temp_c: %d", charger_temp_c);
+#endif
+
+	if (charger_temp_c <= temp_chg_table[current_level].low)
+		current_level--;
+	else if (charger_temp_c >= temp_chg_table[current_level].high)
+		current_level++;
+
+	if (current_level < 0)
+		current_level = 0;
+
+	if (current_level >= NUM_TEMP_CHG_LEVELS)
+		current_level = NUM_TEMP_CHG_LEVELS - 1;
+
+	curr->requested_current = MIN(curr->requested_current,
+				      temp_chg_table[current_level].current);
+
+#ifdef BOARD_TEMP_TEST
+	LOG_WRN("level: %d, batt_current: %d, limit_current: %d", current_level,
+		curr->requested_current, temp_chg_table[current_level].current);
+#endif
+
+	return EC_SUCCESS;
+}
+
+#ifdef BOARD_TEMP_TEST
+static int command_temp_test(int argc, const char **argv)
+{
+	char *e;
+	int t;
+
+	if (argc > 1) {
+		t = strtoi(argv[1], &e, 0);
+		if (*e) {
+			LOG_WRN("Invalid test temp");
+			return EC_ERROR_INVAL;
+		}
+		manual_temp = t;
+		LOG_WRN("manual temp is %d", manual_temp);
+		return EC_SUCCESS;
+	}
+
+	manual_temp = -1;
+	LOG_WRN("manual temp reset");
+
+	return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(tt, command_temp_test, "[temperature]",
+			"set manual temperature for test");
+#endif