1 files changed, 91 insertions, 0 deletions
diff --git a/driver/temp_sensor/pct2075.c b/driver/temp_sensor/pct2075.c
new file mode 100644
index 0000000000..bde1521edc
--- /dev/null
+++ b/driver/temp_sensor/pct2075.c
@@ -0,0 +1,91 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* PCT2075 temperature sensor module for Chrome EC */
+
+#include "common.h"
+#include "console.h"
+#include "pct2075.h"
+#include "i2c.h"
+#include "hooks.h"
+#include "math_util.h"
+#include "util.h"
+
+#define PCT2075_RESOLUTION 11
+#define PCT2075_SHIFT1 (16 - PCT2075_RESOLUTION)
+#define PCT2075_SHIFT2 (PCT2075_RESOLUTION - 8)
+
+#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)
+
+static int temp_mk_local[PCT2075_COUNT];
+
+static int raw_read16(int sensor, const int offset, int *data_ptr)
+{
+#ifdef CONFIG_I2C_BUS_MAY_BE_UNPOWERED
+	/*
+	 * Don't try to read if the port is unpowered
+	 */
+	if (!board_is_i2c_port_powered(pct2075_sensors[sensor].i2c_port))
+		return EC_ERROR_NOT_POWERED;
+#endif
+	return i2c_read16(pct2075_sensors[sensor].i2c_port,
+			  pct2075_sensors[sensor].i2c_addr_flags,
+			  offset, data_ptr);
+}
+
+static int get_reg_temp(int sensor, int *temp_ptr)
+{
+	int temp_raw = 0;
+
+	RETURN_ERROR(raw_read16(sensor, PCT2075_REG_TEMP, &temp_raw));
+
+	*temp_ptr = (int)(int16_t)temp_raw;
+	return EC_SUCCESS;
+}
+
+static inline int pct2075_reg_to_mk(int16_t reg)
+{
+	int temp_mc;
+
+	temp_mc = (((reg >> PCT2075_SHIFT1) * 1000) >> PCT2075_SHIFT2);
+
+	return MILLI_CELSIUS_TO_MILLI_KELVIN(temp_mc);
+}
+
+int pct2075_get_val_k(int idx, int *temp_k_ptr)
+{
+	if (idx >= PCT2075_COUNT)
+		return EC_ERROR_INVAL;
+
+	*temp_k_ptr = MILLI_KELVIN_TO_KELVIN(temp_mk_local[idx]);
+	return EC_SUCCESS;
+}
+
+int pct2075_get_val_mk(int idx, int *temp_mk_ptr)
+{
+	if (idx >= PCT2075_COUNT)
+		return EC_ERROR_INVAL;
+
+	*temp_mk_ptr = temp_mk_local[idx];
+	return EC_SUCCESS;
+}
+
+static void pct2075_poll(void)
+{
+	int s;
+	int temp_reg = 0;
+
+	for (s = 0; s < PCT2075_COUNT; s++) {
+		if (get_reg_temp(s, &temp_reg) == EC_SUCCESS)
+			temp_mk_local[s] = pct2075_reg_to_mk(temp_reg);
+	}
+}
+DECLARE_HOOK(HOOK_SECOND, pct2075_poll, HOOK_PRIO_TEMP_SENSOR);
+
+void pct2075_init(void)
+{
+/* Incase we need to initialize somthing */
+}
+DECLARE_HOOK(HOOK_INIT, pct2075_init, HOOK_PRIO_DEFAULT);