v4.19.13 snapshot.
diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
new file mode 100644
index 0000000..1197270
--- /dev/null
+++ b/drivers/input/mouse/elantech.h
@@ -0,0 +1,210 @@
+/*
+ * Elantech Touchpad driver (v6)
+ *
+ * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Trademarks are the property of their respective owners.
+ */
+
+#ifndef _ELANTECH_H
+#define _ELANTECH_H
+
+/*
+ * Command values for Synaptics style queries
+ */
+#define ETP_FW_ID_QUERY 0x00
+#define ETP_FW_VERSION_QUERY 0x01
+#define ETP_CAPABILITIES_QUERY 0x02
+#define ETP_SAMPLE_QUERY 0x03
+#define ETP_RESOLUTION_QUERY 0x04
+
+/*
+ * Command values for register reading or writing
+ */
+#define ETP_REGISTER_READ 0x10
+#define ETP_REGISTER_WRITE 0x11
+#define ETP_REGISTER_READWRITE 0x00
+
+/*
+ * Hardware version 2 custom PS/2 command value
+ */
+#define ETP_PS2_CUSTOM_COMMAND 0xf8
+
+/*
+ * Times to retry a ps2_command and millisecond delay between tries
+ */
+#define ETP_PS2_COMMAND_TRIES 3
+#define ETP_PS2_COMMAND_DELAY 500
+
+/*
+ * Times to try to read back a register and millisecond delay between tries
+ */
+#define ETP_READ_BACK_TRIES 5
+#define ETP_READ_BACK_DELAY 2000
+
+/*
+ * Register bitmasks for hardware version 1
+ */
+#define ETP_R10_ABSOLUTE_MODE 0x04
+#define ETP_R11_4_BYTE_MODE 0x02
+
+/*
+ * Capability bitmasks
+ */
+#define ETP_CAP_HAS_ROCKER 0x04
+
+/*
+ * One hard to find application note states that X axis range is 0 to 576
+ * and Y axis range is 0 to 384 for harware version 1.
+ * Edge fuzz might be necessary because of bezel around the touchpad
+ */
+#define ETP_EDGE_FUZZ_V1 32
+
+#define ETP_XMIN_V1 ( 0 + ETP_EDGE_FUZZ_V1)
+#define ETP_XMAX_V1 (576 - ETP_EDGE_FUZZ_V1)
+#define ETP_YMIN_V1 ( 0 + ETP_EDGE_FUZZ_V1)
+#define ETP_YMAX_V1 (384 - ETP_EDGE_FUZZ_V1)
+
+/*
+ * The resolution for older v2 hardware doubled.
+ * (newer v2's firmware provides command so we can query)
+ */
+#define ETP_XMIN_V2 0
+#define ETP_XMAX_V2 1152
+#define ETP_YMIN_V2 0
+#define ETP_YMAX_V2 768
+
+#define ETP_PMIN_V2 0
+#define ETP_PMAX_V2 255
+#define ETP_WMIN_V2 0
+#define ETP_WMAX_V2 15
+
+/*
+ * v3 hardware has 2 kinds of packet types,
+ * v4 hardware has 3.
+ */
+#define PACKET_UNKNOWN 0x01
+#define PACKET_DEBOUNCE 0x02
+#define PACKET_V3_HEAD 0x03
+#define PACKET_V3_TAIL 0x04
+#define PACKET_V4_HEAD 0x05
+#define PACKET_V4_MOTION 0x06
+#define PACKET_V4_STATUS 0x07
+#define PACKET_TRACKPOINT 0x08
+
+/*
+ * track up to 5 fingers for v4 hardware
+ */
+#define ETP_MAX_FINGERS 5
+
+/*
+ * weight value for v4 hardware
+ */
+#define ETP_WEIGHT_VALUE 5
+
+/*
+ * Bus information on 3rd byte of query ETP_RESOLUTION_QUERY(0x04)
+ */
+#define ETP_BUS_PS2_ONLY 0
+#define ETP_BUS_SMB_ALERT_ONLY 1
+#define ETP_BUS_SMB_HST_NTFY_ONLY 2
+#define ETP_BUS_PS2_SMB_ALERT 3
+#define ETP_BUS_PS2_SMB_HST_NTFY 4
+
+/*
+ * New ICs are either using SMBus Host Notify or just plain PS2.
+ *
+ * ETP_FW_VERSION_QUERY is:
+ * Byte 1:
+ * - bit 0..3: IC BODY
+ * Byte 2:
+ * - bit 4: HiddenButton
+ * - bit 5: PS2_SMBUS_NOTIFY
+ * - bit 6: PS2CRCCheck
+ */
+#define ETP_NEW_IC_SMBUS_HOST_NOTIFY(fw_version) \
+ ((((fw_version) & 0x0f2000) == 0x0f2000) && \
+ ((fw_version) & 0x0000ff) > 0)
+
+/*
+ * The base position for one finger, v4 hardware
+ */
+struct finger_pos {
+ unsigned int x;
+ unsigned int y;
+};
+
+struct elantech_device_info {
+ unsigned char capabilities[3];
+ unsigned char samples[3];
+ unsigned char debug;
+ unsigned char hw_version;
+ unsigned int fw_version;
+ unsigned int x_res;
+ unsigned int y_res;
+ unsigned int bus;
+ bool paritycheck;
+ bool jumpy_cursor;
+ bool reports_pressure;
+ bool crc_enabled;
+ bool set_hw_resolution;
+ bool has_trackpoint;
+ int (*send_cmd)(struct psmouse *psmouse, unsigned char c,
+ unsigned char *param);
+};
+
+struct elantech_data {
+ struct input_dev *tp_dev; /* Relative device for trackpoint */
+ char tp_phys[32];
+ unsigned char reg_07;
+ unsigned char reg_10;
+ unsigned char reg_11;
+ unsigned char reg_20;
+ unsigned char reg_21;
+ unsigned char reg_22;
+ unsigned char reg_23;
+ unsigned char reg_24;
+ unsigned char reg_25;
+ unsigned char reg_26;
+ unsigned int single_finger_reports;
+ unsigned int y_max;
+ unsigned int width;
+ struct finger_pos mt[ETP_MAX_FINGERS];
+ unsigned char parity[256];
+ struct elantech_device_info info;
+ void (*original_set_rate)(struct psmouse *psmouse, unsigned int rate);
+};
+
+#ifdef CONFIG_MOUSE_PS2_ELANTECH
+int elantech_detect(struct psmouse *psmouse, bool set_properties);
+int elantech_init_ps2(struct psmouse *psmouse);
+int elantech_init(struct psmouse *psmouse);
+#else
+static inline int elantech_detect(struct psmouse *psmouse, bool set_properties)
+{
+ return -ENOSYS;
+}
+static inline int elantech_init(struct psmouse *psmouse)
+{
+ return -ENOSYS;
+}
+static inline int elantech_init_ps2(struct psmouse *psmouse)
+{
+ return -ENOSYS;
+}
+#endif /* CONFIG_MOUSE_PS2_ELANTECH */
+
+#if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)
+int elantech_init_smbus(struct psmouse *psmouse);
+#else
+static inline int elantech_init_smbus(struct psmouse *psmouse)
+{
+ return -ENOSYS;
+}
+#endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */
+
+#endif