208 lines
6.8 KiB
C
208 lines
6.8 KiB
C
/* 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>
|
|
|
|
/* 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,
|
|
};
|
|
|
|
/* Convert a pen in-range reporting type to a string */
|
|
extern const char *uclogic_params_pen_inrange_to_str(
|
|
enum uclogic_params_pen_inrange inrange);
|
|
|
|
/*
|
|
* 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 {
|
|
/*
|
|
* Pointer to report descriptor describing the inputs.
|
|
* Allocated with kmalloc.
|
|
*/
|
|
__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;
|
|
/* 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;
|
|
};
|
|
|
|
/*
|
|
* 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 describing the inputs.
|
|
* Allocated with kmalloc.
|
|
*/
|
|
__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;
|
|
/*
|
|
* 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. Only valid if "id" is
|
|
* not zero.
|
|
*/
|
|
unsigned int dev_id_byte;
|
|
};
|
|
|
|
/*
|
|
* 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 not NULL.
|
|
*/
|
|
unsigned int desc_size;
|
|
/*
|
|
* True, if pen usage in report descriptor is invalid, when present.
|
|
* Only valid, if "invalid" is false.
|
|
*/
|
|
bool pen_unused;
|
|
/*
|
|
* Pen parameters and optional report descriptor part.
|
|
* Only valid if "pen_unused" is valid and false.
|
|
*/
|
|
struct uclogic_params_pen pen;
|
|
/*
|
|
* Frame control parameters and optional report descriptor part.
|
|
* Only valid, if "invalid" is false.
|
|
*/
|
|
struct uclogic_params_frame frame;
|
|
/*
|
|
* Bitmask matching frame controls "sub-report" flag in the second
|
|
* byte of the pen report, or zero if it's not expected.
|
|
* Only valid if both "pen" and "frame" are valid, and "frame.id" is
|
|
* not zero.
|
|
*/
|
|
__u8 pen_frame_flag;
|
|
};
|
|
|
|
/* Initialize a tablet interface and discover its parameters */
|
|
extern int uclogic_params_init(struct uclogic_params *params,
|
|
struct hid_device *hdev);
|
|
|
|
/* Tablet interface parameters *printf format string */
|
|
#define UCLOGIC_PARAMS_FMT_STR \
|
|
".invalid = %s\n" \
|
|
".desc_ptr = %p\n" \
|
|
".desc_size = %u\n" \
|
|
".pen_unused = %s\n" \
|
|
".pen.desc_ptr = %p\n" \
|
|
".pen.desc_size = %u\n" \
|
|
".pen.id = %u\n" \
|
|
".pen.inrange = %s\n" \
|
|
".pen.fragmented_hires = %s\n" \
|
|
".frame.desc_ptr = %p\n" \
|
|
".frame.desc_size = %u\n" \
|
|
".frame.id = %u\n" \
|
|
".frame.re_lsb = %u\n" \
|
|
".frame.dev_id_byte = %u\n" \
|
|
".pen_frame_flag = 0x%02x\n"
|
|
|
|
/* Tablet interface parameters *printf format arguments */
|
|
#define UCLOGIC_PARAMS_FMT_ARGS(_params) \
|
|
((_params)->invalid ? "true" : "false"), \
|
|
(_params)->desc_ptr, \
|
|
(_params)->desc_size, \
|
|
((_params)->pen_unused ? "true" : "false"), \
|
|
(_params)->pen.desc_ptr, \
|
|
(_params)->pen.desc_size, \
|
|
(_params)->pen.id, \
|
|
uclogic_params_pen_inrange_to_str((_params)->pen.inrange), \
|
|
((_params)->pen.fragmented_hires ? "true" : "false"), \
|
|
(_params)->frame.desc_ptr, \
|
|
(_params)->frame.desc_size, \
|
|
(_params)->frame.id, \
|
|
(_params)->frame.re_lsb, \
|
|
(_params)->frame.dev_id_byte, \
|
|
(_params)->pen_frame_flag
|
|
|
|
/* 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);
|
|
|
|
#endif /* _HID_UCLOGIC_PARAMS_H */
|