diff --git a/chip/lm4/lpc.c b/chip/lm4/lpc.c
index afbe31f717..0b9ec2771a 100644
--- a/chip/lm4/lpc.c
+++ b/chip/lm4/lpc.c
@@ -8,6 +8,7 @@
 #include "clock.h"
 #include "common.h"
 #include "console.h"
+#include "dptf.h"
 #include "gpio.h"
 #include "hooks.h"
 #include "host_command.h"
@@ -412,7 +413,7 @@ static void handle_acpi_write(int is_cmd)
 	/* Process complete commands */
 	if (acpi_cmd == EC_CMD_ACPI_READ && acpi_data_count == 1) {
 		/* ACPI read cmd + addr */
-		int result = 0;
+		int result = 0xff;		/* value for bogus read */
 
 		switch (acpi_addr) {
 		case EC_ACPI_MEM_VERSION:
@@ -436,6 +437,12 @@ static void handle_acpi_write(int is_cmd)
 			 */
 			result = pwm_get_duty(PWM_CH_KBLIGHT);
 			break;
+#endif
+#ifdef CONFIG_FANS
+		case EC_ACPI_MEM_FAN_DUTY:
+			/** TODO(crosbug.com/p/23774): Fix this too */
+			result = dptf_get_fan_duty_target();
+			break;
 #endif
 		default:
 			break;
@@ -462,6 +469,12 @@ static void handle_acpi_write(int is_cmd)
 			CPRINTF("\r[%T ACPI kblight %d]", data);
 			pwm_set_duty(PWM_CH_KBLIGHT, data);
 			break;
+#endif
+#ifdef CONFIG_FANS
+		case EC_ACPI_MEM_FAN_DUTY:
+			/** TODO(crosbug.com/p/23774): Fix this too */
+			dptf_set_fan_duty_target(data);
+			break;
 #endif
 		default:
 			CPRINTF("[%T ACPI write 0x%02x = 0x%02x]\n",
diff --git a/common/fan.c b/common/fan.c
index 9d9c0f68fc..520d6fe03b 100644
--- a/common/fan.c
+++ b/common/fan.c
@@ -258,6 +258,36 @@ DECLARE_CONSOLE_COMMAND(fanduty, cc_fanduty,
 			"Set fan duty cycle",
 			NULL);
 
+/*****************************************************************************/
+/* DPTF interface functions */
+
+/* 0-100% if in duty mode. -1 if not */
+int dptf_get_fan_duty_target(void)
+{
+	int fan = 0;				/* TODO(crosbug.com/p/23803) */
+
+	if (thermal_control_enabled[fan] || fan_get_rpm_mode(fan))
+		return -1;
+
+	return fan_get_duty(fan);
+}
+
+/* 0-100% sets duty, out of range means let the EC drive */
+void dptf_set_fan_duty_target(int pct)
+{
+	int fan;
+
+	if (pct < 0 || pct > 100) {
+		/* TODO(crosbug.com/p/23803) */
+		for (fan = 0; fan < CONFIG_FANS; fan++)
+			set_thermal_control_enabled(fan, 1);
+	} else {
+		/* TODO(crosbug.com/p/23803) */
+		for (fan = 0; fan < CONFIG_FANS; fan++)
+			set_duty_cycle(fan, pct);
+	}
+}
+
 /*****************************************************************************/
 /* Host commands */
 
diff --git a/include/dptf.h b/include/dptf.h
new file mode 100644
index 0000000000..48be860f2d
--- /dev/null
+++ b/include/dptf.h
@@ -0,0 +1,17 @@
+/* Copyright (c) 2013 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.
+ */
+
+/* Functions used to provide the Intel DPTF interface over ACPI */
+
+#ifndef __CROS_EC_DPTF_H
+#define __CROS_EC_DPTF_H
+
+/* 0-100% sets fixed duty cycle, out of range means let the EC drive */
+void dptf_set_fan_duty_target(int pct);
+
+/*  0-100% if in duty mode. -1 if not */
+int dptf_get_fan_duty_target(void);
+
+#endif	/* __CROS_EC_DPTF_H */
diff --git a/include/ec_commands.h b/include/ec_commands.h
index b1e3ed887b..b97ef7dc48 100644
--- a/include/ec_commands.h
+++ b/include/ec_commands.h
@@ -1866,6 +1866,8 @@ struct ec_params_reboot_ec {
 #define EC_ACPI_MEM_TEST_COMPLIMENT    0x02
 /* Keyboard backlight brightness percent (0 - 100) */
 #define EC_ACPI_MEM_KEYBOARD_BACKLIGHT 0x03
+/* Target Fan Duty (0-100, 0xff for auto/none) */
+#define EC_ACPI_MEM_FAN_DUTY 0x04
 
 /* Current version of ACPI memory address space */
 #define EC_ACPI_MEM_VERSION_CURRENT 1