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diff --git a/drivers/hid/hid-uclogic-params.h b/drivers/hid/hid-uclogic-params.h
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * HID driver for UC-Logic devices not fully compliant with HID standard
+ * - tablet initialization and parameter retrieval
+ *
+ * Copyright (c) 2018 Nikolai Kondrashov
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#ifndef _HID_UCLOGIC_PARAMS_H
+#define _HID_UCLOGIC_PARAMS_H
+
+#include <linux/usb.h>
+#include <linux/hid.h>
+#include <linux/list.h>
+
+#define UCLOGIC_MOUSE_FRAME_QUIRK BIT(0)
+#define UCLOGIC_BATTERY_QUIRK BIT(1)
+
+/* Types of pen in-range reporting */
+enum uclogic_params_pen_inrange {
+ /* Normal reports: zero - out of proximity, one - in proximity */
+ UCLOGIC_PARAMS_PEN_INRANGE_NORMAL = 0,
+ /* Inverted reports: zero - in proximity, one - out of proximity */
+ UCLOGIC_PARAMS_PEN_INRANGE_INVERTED,
+ /* No reports */
+ UCLOGIC_PARAMS_PEN_INRANGE_NONE,
+};
+
+/* Types of frames */
+enum uclogic_params_frame_type {
+ /* Frame with buttons */
+ UCLOGIC_PARAMS_FRAME_BUTTONS = 0,
+ /* Frame with buttons and a dial */
+ UCLOGIC_PARAMS_FRAME_DIAL,
+ /* Frame with buttons and a mouse (shaped as a dial + touchpad) */
+ UCLOGIC_PARAMS_FRAME_MOUSE,
+};
+
+/*
+ * Pen report's subreport data.
+ */
+struct uclogic_params_pen_subreport {
+ /*
+ * The value of the second byte of the pen report indicating this
+ * subreport. If zero, the subreport should be considered invalid and
+ * not matched.
+ */
+ __u8 value;
+
+ /*
+ * The ID to be assigned to the report, if the second byte of the pen
+ * report is equal to "value". Only valid if "value" is not zero.
+ */
+ __u8 id;
+};
+
+/*
+ * Tablet interface's pen input parameters.
+ *
+ * Must use declarative (descriptive) language, not imperative, to simplify
+ * understanding and maintain consistency.
+ *
+ * Noop (preserving functionality) when filled with zeroes.
+ */
+struct uclogic_params_pen {
+ /*
+ * True if pen usage is invalid for this interface and should be
+ * ignored, false otherwise.
+ */
+ bool usage_invalid;
+ /*
+ * Pointer to report descriptor part describing the pen inputs.
+ * Allocated with kmalloc. NULL if the part is not specified.
+ */
+ __u8 *desc_ptr;
+ /*
+ * Size of the report descriptor.
+ * Only valid, if "desc_ptr" is not NULL.
+ */
+ unsigned int desc_size;
+ /* Report ID, if reports should be tweaked, zero if not */
+ unsigned int id;
+ /* The list of subreports, only valid if "id" is not zero */
+ struct uclogic_params_pen_subreport subreport_list[3];
+ /* Type of in-range reporting, only valid if "id" is not zero */
+ enum uclogic_params_pen_inrange inrange;
+ /*
+ * True, if reports include fragmented high resolution coords, with
+ * high-order X and then Y bytes following the pressure field.
+ * Only valid if "id" is not zero.
+ */
+ bool fragmented_hires;
+ /*
+ * True if the pen reports tilt in bytes at offset 10 (X) and 11 (Y),
+ * and the Y tilt direction is flipped.
+ * Only valid if "id" is not zero.
+ */
+ bool tilt_y_flipped;
+};
+
+/*
+ * Parameters of frame control inputs of a tablet interface.
+ *
+ * Must use declarative (descriptive) language, not imperative, to simplify
+ * understanding and maintain consistency.
+ *
+ * Noop (preserving functionality) when filled with zeroes.
+ */
+struct uclogic_params_frame {
+ /*
+ * Pointer to report descriptor part describing the frame inputs.
+ * Allocated with kmalloc. NULL if the part is not specified.
+ */
+ __u8 *desc_ptr;
+ /*
+ * Size of the report descriptor.
+ * Only valid, if "desc_ptr" is not NULL.
+ */
+ unsigned int desc_size;
+ /*
+ * Report ID, if reports should be tweaked, zero if not.
+ */
+ unsigned int id;
+ /*
+ * The suffix to add to the input device name, if not NULL.
+ */
+ const char *suffix;
+ /*
+ * Number of the least-significant bit of the 2-bit state of a rotary
+ * encoder, in the report. Cannot point to a 2-bit field crossing a
+ * byte boundary. Zero if not present. Only valid if "id" is not zero.
+ */
+ unsigned int re_lsb;
+ /*
+ * Offset of the Wacom-style device ID byte in the report, to be set
+ * to pad device ID (0xf), for compatibility with Wacom drivers. Zero
+ * if no changes to the report should be made. The ID byte will be set
+ * to zero whenever the byte pointed by "touch_byte" is zero, if
+ * the latter is valid. Only valid if "id" is not zero.
+ */
+ unsigned int dev_id_byte;
+ /*
+ * Offset of the touch ring/strip state byte, in the report.
+ * Zero if not present. If dev_id_byte is also valid and non-zero,
+ * then the device ID byte will be cleared when the byte pointed to by
+ * this offset is zero. Only valid if "id" is not zero.
+ */
+ unsigned int touch_byte;
+ /*
+ * The value to anchor the reversed touch ring/strip reports at.
+ * I.e. one, if the reports should be flipped without offset.
+ * Zero if no reversal should be done.
+ * Only valid if "touch_byte" is valid and not zero.
+ */
+ __s8 touch_flip_at;
+ /*
+ * Maximum value of the touch ring/strip report around which the value
+ * should be wrapped when flipping according to "touch_flip_at".
+ * The minimum valid value is considered to be one, with zero being
+ * out-of-proximity (finger lift) value.
+ * Only valid if "touch_flip_at" is valid and not zero.
+ */
+ __s8 touch_max;
+ /*
+ * Offset of the bitmap dial byte, in the report. Zero if not present.
+ * Only valid if "id" is not zero. A bitmap dial sends reports with a
+ * dedicated bit per direction: 1 means clockwise rotation, 2 means
+ * counterclockwise, as opposed to the normal 1 and -1.
+ */
+ unsigned int bitmap_dial_byte;
+};
+
+/*
+ * List of works to be performed when a certain raw event is received.
+ */
+struct uclogic_raw_event_hook {
+ struct hid_device *hdev;
+ __u8 *event;
+ size_t size;
+ struct work_struct work;
+ struct list_head list;
+};
+
+/*
+ * Tablet interface report parameters.
+ *
+ * Must use declarative (descriptive) language, not imperative, to simplify
+ * understanding and maintain consistency.
+ *
+ * When filled with zeros represents a "noop" configuration - passes all
+ * reports unchanged and lets the generic HID driver handle everything.
+ *
+ * The resulting device report descriptor is assembled from all the report
+ * descriptor parts referenced by the structure. No order of assembly should
+ * be assumed. The structure represents original device report descriptor if
+ * all the parts are NULL.
+ */
+struct uclogic_params {
+ /*
+ * True if the whole interface is invalid, false otherwise.
+ */
+ bool invalid;
+ /*
+ * Pointer to the common part of the replacement report descriptor,
+ * allocated with kmalloc. NULL if no common part is needed.
+ * Only valid, if "invalid" is false.
+ */
+ __u8 *desc_ptr;
+ /*
+ * Size of the common part of the replacement report descriptor.
+ * Only valid, if "desc_ptr" is valid and not NULL.
+ */
+ unsigned int desc_size;
+ /*
+ * Pen parameters and optional report descriptor part.
+ * Only valid, if "invalid" is false.
+ */
+ struct uclogic_params_pen pen;
+ /*
+ * The list of frame control parameters and optional report descriptor
+ * parts. Only valid, if "invalid" is false.
+ */
+ struct uclogic_params_frame frame_list[3];
+ /*
+ * List of event hooks.
+ */
+ struct uclogic_raw_event_hook *event_hooks;
+};
+
+/* Driver data */
+struct uclogic_drvdata {
+ /* Interface parameters */
+ struct uclogic_params params;
+ /* Pointer to the replacement report descriptor. NULL if none. */
+ __u8 *desc_ptr;
+ /*
+ * Size of the replacement report descriptor.
+ * Only valid if desc_ptr is not NULL
+ */
+ unsigned int desc_size;
+ /* Pen input device */
+ struct input_dev *pen_input;
+ /* In-range timer */
+ struct timer_list inrange_timer;
+ /* Last rotary encoder state, or U8_MAX for none */
+ u8 re_state;
+ /* Device quirks */
+ unsigned long quirks;
+};
+
+/* Initialize a tablet interface and discover its parameters */
+extern int uclogic_params_init(struct uclogic_params *params,
+ struct hid_device *hdev);
+
+/* Get a replacement report descriptor for a tablet's interface. */
+extern int uclogic_params_get_desc(const struct uclogic_params *params,
+ __u8 **pdesc,
+ unsigned int *psize);
+
+/* Free resources used by tablet interface's parameters */
+extern void uclogic_params_cleanup(struct uclogic_params *params);
+
+/* Dump tablet interface parameters with hid_dbg() */
+extern void uclogic_params_hid_dbg(const struct hid_device *hdev,
+ const struct uclogic_params *params);
+
+#endif /* _HID_UCLOGIC_PARAMS_H */