diff --git a/src/lib/steam_controller.c b/src/lib/steam_controller.c
new file mode 100644
index 0000000..797e454
--- /dev/null
+++ b/src/lib/steam_controller.c
@@ -0,0 +1,88 @@
+#include "../config.h"
+#if USE_USB
+#include <usbdrvce.h>
+#include <stdlib.h>
+#include <string.h>
+#include <debug.h>
+#include <graphx.h>
+#include "steam_controller.h"
+
+#define VENDOR_STEAM  0x28DE
+#define DEVICE_WIRED  0x1102
+#define DEVICE_DONGLE 0x1142
+
+int8_t sc_GetInterface(usb_device_t dev) {
+    usb_device_descriptor_t descriptor;
+    usb_GetDescriptor(dev, USB_DEVICE_DESCRIPTOR, 0,
+                      &descriptor, sizeof(descriptor), NULL);
+    if(descriptor.idVendor != VENDOR_STEAM) return -1;
+    switch(descriptor.idProduct) {
+        case DEVICE_WIRED:
+            return 2;
+        case DEVICE_DONGLE:
+            return 1;
+        default:
+            return -1;
+    }
+}
+
+struct DataPacket {
+    uint8_t header;
+    uint8_t request;
+    sc_haptic_t haptic;
+    uint16_t pulse_high;
+    uint16_t pulse_low;
+    uint16_t repeat_count;
+    uint8_t padding[55];
+};
+
+usb_error_t tone_callback(usb_endpoint_t pEndpoint,
+                          usb_transfer_status_t status,
+                          size_t size, void *pVoid) {
+    dbg_sprintf(dbgout, "callback called\n");
+    free(pVoid);
+    return USB_SUCCESS;
+}
+
+const struct DataPacket sc_default_data = {0x8f, 0x08};
+
+void sc_PlayTone(usb_device_t dev, uint8_t interface,
+                 sc_haptic_t haptic, uint16_t pulse_duration,
+                 uint16_t repeat_count) {
+    struct DataPacket *data = malloc(sizeof(sc_default_data));
+    usb_control_setup_t setup = {0x21, 9, 0x300, 0, 64};
+
+    if(!dev) return;
+
+    if(data) {
+        dbg_sprintf(dbgout, "tone %u %u %u\n", haptic, pulse_duration, repeat_count);
+        setup.wIndex = interface;
+        memcpy(data, &sc_default_data, sizeof(sc_default_data));
+        data->haptic = haptic;
+        data->pulse_high = data->pulse_low = pulse_duration;
+        data->repeat_count = repeat_count;
+
+        usb_ScheduleDefaultControlTransfer(dev, &setup, data, tone_callback, data);
+    } else {
+        dbg_sprintf(dbgout, "failed to alloc for PlayTone\n");
+    }
+}
+
+void sc_StopTone(usb_device_t dev, uint8_t interface,
+                 sc_haptic_t haptic) {
+    struct DataPacket *data = malloc(sizeof(sc_default_data));
+    usb_control_setup_t setup = {0x21, 9, 0x300, 0, 64};
+
+    if(data) {
+        setup.wIndex = interface;
+        memcpy(data, &sc_default_data, sizeof(sc_default_data));
+        data->haptic = haptic;
+
+        usb_ScheduleDefaultControlTransfer(dev, &setup, data, tone_callback, data);
+    } else {
+        dbg_sprintf(dbgout, "failed to alloc for StopTone\n");
+    }
+}
+
+
+#endif
diff --git a/src/lib/steam_controller.h b/src/lib/steam_controller.h
new file mode 100644
index 0000000..8bc551b
--- /dev/null
+++ b/src/lib/steam_controller.h
@@ -0,0 +1,60 @@
+#ifndef DINO_STEAM_CONTROLLER_H
+#define DINO_STEAM_CONTROLLER_H
+
+#include <stdint.h>
+#include <usbdrvce.h>
+#include <stdbool.h>
+
+enum {
+    SC_HAPTIC_RIGHT,
+    SC_HAPTIC_LEFT
+};
+typedef bool sc_haptic_t;
+
+/**
+ * Gets the interface number to use for controlling haptic feedback
+ * @param dev USB device to check
+ * @return Interface number, or -1 if not a steam controller
+ */
+int8_t sc_GetInterface(usb_device_t dev);
+
+/**
+ * Plays a tone on the Steam controller
+ * @param dev USB device
+ * @param interface Interface from \c sc_GetInterface
+ * @param haptic Which haptic feedback motor to use
+ * @param pulse_duration Duration of each pulse. Use \c sc_FrequencyToDuration
+ * @param repeat_count Number of times to repeat. Use \c sc_TimeToRepeatCount
+ */
+void sc_PlayTone(usb_device_t dev, uint8_t interface,
+                        sc_haptic_t haptic, uint16_t pulse_duration,
+                        uint16_t repeat_count);
+
+/**
+ * Stops playing a tone on the Steam controller
+ * @param dev USB device
+ * @param interface Interface from \c sc_GetInterface
+ * @param haptic Which haptic feedback motor to stop
+ */
+void sc_StopTone(usb_device_t dev, uint8_t interface,
+                        sc_haptic_t haptic);
+
+#define STEAM_CONTROLLER_MAGIC_PERIOD_RATIO 495483
+
+/**
+ * Converts a frequency to a pulse duration
+ * @param freq Frequency in hertz
+ * @return Pulse duration for use with sc_PlayTone
+ */
+#define sc_FrequencyToDuration(freq) ((uint16_t)(STEAM_CONTROLLER_MAGIC_PERIOD_RATIO / freq))
+
+/**
+ * Converts a time and frequency to a repeat count
+ * @param ms Time in milliseconds
+ * @param freq Frequency in hertz
+ * @return Repeat count for use with sc_PlayTone
+ */
+#define sc_TimeToRepeatCount(ms, freq) ((uint16_t)((ms * freq) / 1000))
+
+
+#endif //DINO_STEAM_CONTROLLER_H