v4.19.13 snapshot.
diff --git a/drivers/input/mouse/hgpk.h b/drivers/input/mouse/hgpk.h
new file mode 100644
index 0000000..98b7b38
--- /dev/null
+++ b/drivers/input/mouse/hgpk.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * OLPC HGPK (XO-1) touchpad PS/2 mouse driver
+ */
+
+#ifndef _HGPK_H
+#define _HGPK_H
+
+#define HGPK_GS 0xff /* The GlideSensor */
+#define HGPK_PT 0xcf /* The PenTablet */
+
+enum hgpk_model_t {
+ HGPK_MODEL_PREA = 0x0a, /* pre-B1s */
+ HGPK_MODEL_A = 0x14, /* found on B1s, PT disabled in hardware */
+ HGPK_MODEL_B = 0x28, /* B2s, has capacitance issues */
+ HGPK_MODEL_C = 0x3c,
+ HGPK_MODEL_D = 0x50, /* C1, mass production */
+};
+
+enum hgpk_spew_flag {
+ NO_SPEW,
+ MAYBE_SPEWING,
+ SPEW_DETECTED,
+ RECALIBRATING,
+};
+
+#define SPEW_WATCH_COUNT 42 /* at 12ms/packet, this is 1/2 second */
+
+enum hgpk_mode {
+ HGPK_MODE_MOUSE,
+ HGPK_MODE_GLIDESENSOR,
+ HGPK_MODE_PENTABLET,
+ HGPK_MODE_INVALID
+};
+
+struct hgpk_data {
+ struct psmouse *psmouse;
+ enum hgpk_mode mode;
+ bool powered;
+ enum hgpk_spew_flag spew_flag;
+ int spew_count, x_tally, y_tally; /* spew detection */
+ unsigned long recalib_window;
+ struct delayed_work recalib_wq;
+ int abs_x, abs_y;
+ int dupe_count;
+ int xbigj, ybigj, xlast, ylast; /* jumpiness detection */
+ int xsaw_secondary, ysaw_secondary; /* jumpiness detection */
+};
+
+#ifdef CONFIG_MOUSE_PS2_OLPC
+void hgpk_module_init(void);
+int hgpk_detect(struct psmouse *psmouse, bool set_properties);
+int hgpk_init(struct psmouse *psmouse);
+#else
+static inline void hgpk_module_init(void)
+{
+}
+static inline int hgpk_detect(struct psmouse *psmouse, bool set_properties)
+{
+ return -ENODEV;
+}
+static inline int hgpk_init(struct psmouse *psmouse)
+{
+ return -ENODEV;
+}
+#endif
+
+#endif