1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * HID driver for UC-Logic devices not fully compliant with HID standard
4 * - tablet initialization and parameter retrieval
6 * Copyright (c) 2018 Nikolai Kondrashov
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
16 #ifndef _HID_UCLOGIC_PARAMS_H
17 #define _HID_UCLOGIC_PARAMS_H
19 #include <linux/usb.h>
20 #include <linux/hid.h>
22 #define UCLOGIC_MOUSE_FRAME_QUIRK BIT(0)
23 #define UCLOGIC_BATTERY_QUIRK BIT(1)
25 /* Types of pen in-range reporting */
26 enum uclogic_params_pen_inrange {
27 /* Normal reports: zero - out of proximity, one - in proximity */
28 UCLOGIC_PARAMS_PEN_INRANGE_NORMAL = 0,
29 /* Inverted reports: zero - in proximity, one - out of proximity */
30 UCLOGIC_PARAMS_PEN_INRANGE_INVERTED,
32 UCLOGIC_PARAMS_PEN_INRANGE_NONE,
36 enum uclogic_params_frame_type {
37 /* Frame with buttons */
38 UCLOGIC_PARAMS_FRAME_BUTTONS = 0,
39 /* Frame with buttons and a dial */
40 UCLOGIC_PARAMS_FRAME_DIAL,
41 /* Frame with buttons and a mouse (shaped as a dial + touchpad) */
42 UCLOGIC_PARAMS_FRAME_MOUSE,
46 * Pen report's subreport data.
48 struct uclogic_params_pen_subreport {
50 * The value of the second byte of the pen report indicating this
51 * subreport. If zero, the subreport should be considered invalid and
57 * The ID to be assigned to the report, if the second byte of the pen
58 * report is equal to "value". Only valid if "value" is not zero.
64 * Tablet interface's pen input parameters.
66 * Must use declarative (descriptive) language, not imperative, to simplify
67 * understanding and maintain consistency.
69 * Noop (preserving functionality) when filled with zeroes.
71 struct uclogic_params_pen {
73 * True if pen usage is invalid for this interface and should be
74 * ignored, false otherwise.
78 * Pointer to report descriptor part describing the pen inputs.
79 * Allocated with kmalloc. NULL if the part is not specified.
83 * Size of the report descriptor.
84 * Only valid, if "desc_ptr" is not NULL.
86 unsigned int desc_size;
87 /* Report ID, if reports should be tweaked, zero if not */
89 /* The list of subreports, only valid if "id" is not zero */
90 struct uclogic_params_pen_subreport subreport_list[3];
91 /* Type of in-range reporting, only valid if "id" is not zero */
92 enum uclogic_params_pen_inrange inrange;
94 * True, if reports include fragmented high resolution coords, with
95 * high-order X and then Y bytes following the pressure field.
96 * Only valid if "id" is not zero.
98 bool fragmented_hires;
100 * True if the pen reports tilt in bytes at offset 10 (X) and 11 (Y),
101 * and the Y tilt direction is flipped.
102 * Only valid if "id" is not zero.
108 * Parameters of frame control inputs of a tablet interface.
110 * Must use declarative (descriptive) language, not imperative, to simplify
111 * understanding and maintain consistency.
113 * Noop (preserving functionality) when filled with zeroes.
115 struct uclogic_params_frame {
117 * Pointer to report descriptor part describing the frame inputs.
118 * Allocated with kmalloc. NULL if the part is not specified.
122 * Size of the report descriptor.
123 * Only valid, if "desc_ptr" is not NULL.
125 unsigned int desc_size;
127 * Report ID, if reports should be tweaked, zero if not.
131 * The suffix to add to the input device name, if not NULL.
135 * Number of the least-significant bit of the 2-bit state of a rotary
136 * encoder, in the report. Cannot point to a 2-bit field crossing a
137 * byte boundary. Zero if not present. Only valid if "id" is not zero.
141 * Offset of the Wacom-style device ID byte in the report, to be set
142 * to pad device ID (0xf), for compatibility with Wacom drivers. Zero
143 * if no changes to the report should be made. The ID byte will be set
144 * to zero whenever the byte pointed by "touch_byte" is zero, if
145 * the latter is valid. Only valid if "id" is not zero.
147 unsigned int dev_id_byte;
149 * Offset of the touch ring/strip state byte, in the report.
150 * Zero if not present. If dev_id_byte is also valid and non-zero,
151 * then the device ID byte will be cleared when the byte pointed to by
152 * this offset is zero. Only valid if "id" is not zero.
154 unsigned int touch_byte;
156 * The value to anchor the reversed touch ring/strip reports at.
157 * I.e. one, if the reports should be flipped without offset.
158 * Zero if no reversal should be done.
159 * Only valid if "touch_byte" is valid and not zero.
163 * Maximum value of the touch ring/strip report around which the value
164 * should be wrapped when flipping according to "touch_flip_at".
165 * The minimum valid value is considered to be one, with zero being
166 * out-of-proximity (finger lift) value.
167 * Only valid if "touch_flip_at" is valid and not zero.
171 * Offset of the bitmap dial byte, in the report. Zero if not present.
172 * Only valid if "id" is not zero. A bitmap dial sends reports with a
173 * dedicated bit per direction: 1 means clockwise rotation, 2 means
174 * counterclockwise, as opposed to the normal 1 and -1.
176 unsigned int bitmap_dial_byte;
180 * Tablet interface report parameters.
182 * Must use declarative (descriptive) language, not imperative, to simplify
183 * understanding and maintain consistency.
185 * When filled with zeros represents a "noop" configuration - passes all
186 * reports unchanged and lets the generic HID driver handle everything.
188 * The resulting device report descriptor is assembled from all the report
189 * descriptor parts referenced by the structure. No order of assembly should
190 * be assumed. The structure represents original device report descriptor if
191 * all the parts are NULL.
193 struct uclogic_params {
195 * True if the whole interface is invalid, false otherwise.
199 * Pointer to the common part of the replacement report descriptor,
200 * allocated with kmalloc. NULL if no common part is needed.
201 * Only valid, if "invalid" is false.
205 * Size of the common part of the replacement report descriptor.
206 * Only valid, if "desc_ptr" is valid and not NULL.
208 unsigned int desc_size;
210 * Pen parameters and optional report descriptor part.
211 * Only valid, if "invalid" is false.
213 struct uclogic_params_pen pen;
215 * The list of frame control parameters and optional report descriptor
216 * parts. Only valid, if "invalid" is false.
218 struct uclogic_params_frame frame_list[3];
222 struct uclogic_drvdata {
223 /* Interface parameters */
224 struct uclogic_params params;
225 /* Pointer to the replacement report descriptor. NULL if none. */
228 * Size of the replacement report descriptor.
229 * Only valid if desc_ptr is not NULL
231 unsigned int desc_size;
232 /* Pen input device */
233 struct input_dev *pen_input;
235 struct timer_list inrange_timer;
236 /* Last rotary encoder state, or U8_MAX for none */
239 unsigned long quirks;
242 /* Initialize a tablet interface and discover its parameters */
243 extern int uclogic_params_init(struct uclogic_params *params,
244 struct hid_device *hdev);
246 /* Get a replacement report descriptor for a tablet's interface. */
247 extern int uclogic_params_get_desc(const struct uclogic_params *params,
249 unsigned int *psize);
251 /* Free resources used by tablet interface's parameters */
252 extern void uclogic_params_cleanup(struct uclogic_params *params);
254 /* Dump tablet interface parameters with hid_dbg() */
255 extern void uclogic_params_hid_dbg(const struct hid_device *hdev,
256 const struct uclogic_params *params);
258 #endif /* _HID_UCLOGIC_PARAMS_H */