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// SPDX-License-Identifier: GPL-2.0+/* * HID driver for UC-Logic devices not fully compliant with HID standard * * Copyright (c) 2010-2014 Nikolai Kondrashov * Copyright (c) 2013 Martin Rusko *//* * 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. *//* 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;};/** * uclogic_inrange_timeout - handle pen in-range state timeout. * Emulate input events normally generated when pen goes out of range for * tablets which don't report that. * * @t: The timer the timeout handler is attached to, stored in a struct * uclogic_drvdata. */static void uclogic_inrange_timeout(struct timer_list *t){ struct uclogic_drvdata *drvdata = from_timer(drvdata, t, inrange_timer); struct input_dev *input = drvdata->pen_input; if (input == NULL) return; input_report_abs(input, ABS_PRESSURE, 0); /* If BTN_TOUCH state is changing */ if (test_bit(BTN_TOUCH, input->key)) { input_event(input, EV_MSC, MSC_SCAN, /* Digitizer Tip Switch usage */ 0xd0042); input_report_key(input, BTN_TOUCH, 0); } input_report_key(input, BTN_TOOL_PEN, 0); input_sync(input);}static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize){ struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev); if (drvdata->desc_ptr != NULL) { rdesc = drvdata->desc_ptr; *rsize = drvdata->desc_size; } return rdesc;}static int uclogic_input_mapping(struct hid_device *hdev, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max){ struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev); struct uclogic_params *params = &drvdata->params;