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