drivers/hid/hid-uclogic-core.c - linux - Git at Google

 // 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.
  */

 #include <linux/device.h>
 #include <linux/hid.h>
 #include <linux/module.h>
 #include <linux/timer.h>
 #include "usbhid/usbhid.h"
 #include "hid-uclogic-params.h"

 #include "hid-ids.h"

 /**
  * 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;

 	/* Discard invalid pen usages */
 	if (params->pen.usage_invalid && (field->application == HID_DG_PEN))
 		return -1;

 	/* Let hid-core decide what to do */
 	return 0;
 }

 static int uclogic_input_configured(struct hid_device *hdev,
 		struct hid_input *hi)
 {
 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
 	struct uclogic_params *params = &drvdata->params;
 	char *name;
 	const char *suffix = NULL;
 	struct hid_field *field;
 	size_t len;
 	size_t i;
 	const struct uclogic_params_frame *frame;

 	/* no report associated (HID_QUIRK_MULTI_INPUT not set) */
 	if (!hi->report)
 		return 0;

 	/*
 	 * If this is the input corresponding to the pen report
 	 * in need of tweaking.
 	 */
 	if (hi->report->id == params->pen.id) {
 		/* Remember the input device so we can simulate events */
 		drvdata->pen_input = hi->input;
 	}

 	/* If it's one of the frame devices */
 	for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
 		frame = &params->frame_list[i];
 		if (hi->report->id == frame->id) {
 			/* Assign custom suffix, if any */
 			suffix = frame->suffix;
 			/*
 			 * Disable EV_MSC reports for touch ring interfaces to
 			 * make the Wacom driver pickup touch ring extents
 			 */
 			if (frame->touch_byte > 0)
 				__clear_bit(EV_MSC, hi->input->evbit);
 		}
 	}

 	if (!suffix) {
 		field = hi->report->field[0];

 		switch (field->application) {
 		case HID_GD_KEYBOARD:
 			suffix = "Keyboard";
 			break;
 		case HID_GD_MOUSE:
 			suffix = "Mouse";
 			break;
 		case HID_GD_KEYPAD:
 			suffix = "Pad";
 			break;
 		case HID_DG_PEN:
 		case HID_DG_DIGITIZER:
 			suffix = "Pen";
 			break;
 		case HID_CP_CONSUMER_CONTROL:
 			suffix = "Consumer Control";
 			break;
 		case HID_GD_SYSTEM_CONTROL:
 			suffix = "System Control";
 			break;
 		}
 	}

 	if (suffix) {
 		len = strlen(hdev->name) + 2 + strlen(suffix);
 		name = devm_kzalloc(&hi->input->dev, len, GFP_KERNEL);
 		if (name) {
 			snprintf(name, len, "%s %s", hdev->name, suffix);
 			hi->input->name = name;
 		}
 	}

 	return 0;
 }

 static int uclogic_probe(struct hid_device *hdev,
 		const struct hid_device_id *id)
 {
 	int rc;
 	struct uclogic_drvdata *drvdata = NULL;
 	bool params_initialized = false;

 	if (!hid_is_usb(hdev))
 		return -EINVAL;

 	/*
 	 * libinput requires the pad interface to be on a different node
 	 * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
 	 */
 	hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 	hdev->quirks |= HID_QUIRK_HIDINPUT_FORCE;

 	/* Allocate and assign driver data */
 	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
 	if (drvdata == NULL) {
 		rc = -ENOMEM;
 		goto failure;
 	}
 	timer_setup(&drvdata->inrange_timer, uclogic_inrange_timeout, 0);
 	drvdata->re_state = U8_MAX;
 	drvdata->quirks = id->driver_data;
 	hid_set_drvdata(hdev, drvdata);

 	/* Initialize the device and retrieve interface parameters */
 	rc = uclogic_params_init(&drvdata->params, hdev);
 	if (rc != 0) {
 		hid_err(hdev, "failed probing parameters: %d\n", rc);
 		goto failure;
 	}
 	params_initialized = true;
 	hid_dbg(hdev, "parameters:\n");
 	uclogic_params_hid_dbg(hdev, &drvdata->params);
 	if (drvdata->params.invalid) {
 		hid_info(hdev, "interface is invalid, ignoring\n");
 		rc = -ENODEV;
 		goto failure;
 	}

 	/* Generate replacement report descriptor */
 	rc = uclogic_params_get_desc(&drvdata->params,
 				     &drvdata->desc_ptr,
 				     &drvdata->desc_size);
 	if (rc) {
 		hid_err(hdev,
 			"failed generating replacement report descriptor: %d\n",
 			rc);
 		goto failure;
 	}

 	rc = hid_parse(hdev);
 	if (rc) {
 		hid_err(hdev, "parse failed\n");
 		goto failure;
 	}

 	rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 	if (rc) {
 		hid_err(hdev, "hw start failed\n");
 		goto failure;
 	}

 	return 0;
 failure:
 	/* Assume "remove" might not be called if "probe" failed */
 	if (params_initialized)
 		uclogic_params_cleanup(&drvdata->params);
 	return rc;
 }

 #ifdef CONFIG_PM
 static int uclogic_resume(struct hid_device *hdev)
 {
 	int rc;
 	struct uclogic_params params;

 	/* Re-initialize the device, but discard parameters */
 	rc = uclogic_params_init(&params, hdev);
 	if (rc != 0)
 		hid_err(hdev, "failed to re-initialize the device\n");
 	else
 		uclogic_params_cleanup(&params);

 	return rc;
 }
 #endif

 /**
  * uclogic_exec_event_hook - if the received event is hooked schedules the
  * associated work.
  *
  * @p:		Tablet interface report parameters.
  * @event:	Raw event.
  * @size:	The size of event.
  *
  * Returns:
  *	Whether the event was hooked or not.
  */
 static bool uclogic_exec_event_hook(struct uclogic_params *p, u8 *event, int size)
 {
 	struct uclogic_raw_event_hook *curr;

 	if (!p->event_hooks)
 		return false;

 	list_for_each_entry(curr, &p->event_hooks->list, list) {
 		if (curr->size == size && memcmp(curr->event, event, size) == 0) {
 			schedule_work(&curr->work);
 			return true;
 		}
 	}

 	return false;
 }

 /**
  * uclogic_raw_event_pen - handle raw pen events (pen HID reports).
  *
  * @drvdata:	Driver data.
  * @data:	Report data buffer, can be modified.
  * @size:	Report data size, bytes.
  *
  * Returns:
  *	Negative value on error (stops event delivery), zero for success.
  */
 static int uclogic_raw_event_pen(struct uclogic_drvdata *drvdata,
 					u8 *data, int size)
 {
 	struct uclogic_params_pen *pen = &drvdata->params.pen;

 	WARN_ON(drvdata == NULL);
 	WARN_ON(data == NULL && size != 0);

 	/* If in-range reports are inverted */
 	if (pen->inrange ==
 		UCLOGIC_PARAMS_PEN_INRANGE_INVERTED) {
 		/* Invert the in-range bit */
 		data[1] ^= 0x40;
 	}
 	/*
 	 * If report contains fragmented high-resolution pen
 	 * coordinates
 	 */
 	if (size >= 10 && pen->fragmented_hires) {
 		u8 pressure_low_byte;
 		u8 pressure_high_byte;

 		/* Lift pressure bytes */
 		pressure_low_byte = data[6];
 		pressure_high_byte = data[7];
 		/*
 		 * Move Y coord to make space for high-order X
 		 * coord byte
 		 */
 		data[6] = data[5];
 		data[5] = data[4];
 		/* Move high-order X coord byte */
 		data[4] = data[8];
 		/* Move high-order Y coord byte */
 		data[7] = data[9];
 		/* Place pressure bytes */
 		data[8] = pressure_low_byte;
 		data[9] = pressure_high_byte;
 	}
 	/* If we need to emulate in-range detection */
 	if (pen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE) {
 		/* Set in-range bit */
 		data[1] |= 0x40;
 		/* (Re-)start in-range timeout */
 		mod_timer(&drvdata->inrange_timer,
 				jiffies + msecs_to_jiffies(100));
 	}
 	/* If we report tilt and Y direction is flipped */
 	if (size >= 12 && pen->tilt_y_flipped)
 		data[11] = -data[11];

 	return 0;
 }

 /**
  * uclogic_raw_event_frame - handle raw frame events (frame HID reports).
  *
  * @drvdata:	Driver data.
  * @frame:	The parameters of the frame controls to handle.
  * @data:	Report data buffer, can be modified.
  * @size:	Report data size, bytes.
  *
  * Returns:
  *	Negative value on error (stops event delivery), zero for success.
  */
 static int uclogic_raw_event_frame(
 		struct uclogic_drvdata *drvdata,
 		const struct uclogic_params_frame *frame,
 		u8 *data, int size)
 {
 	WARN_ON(drvdata == NULL);
 	WARN_ON(data == NULL && size != 0);

 	/* If need to, and can, set pad device ID for Wacom drivers */
 	if (frame->dev_id_byte > 0 && frame->dev_id_byte < size) {
 		/* If we also have a touch ring and the finger left it */
 		if (frame->touch_byte > 0 && frame->touch_byte < size &&
 		    data[frame->touch_byte] == 0) {
 			data[frame->dev_id_byte] = 0;
 		} else {
 			data[frame->dev_id_byte] = 0xf;
 		}
 	}

 	/* If need to, and can, read rotary encoder state change */
 	if (frame->re_lsb > 0 && frame->re_lsb / 8 < size) {
 		unsigned int byte = frame->re_lsb / 8;
 		unsigned int bit = frame->re_lsb % 8;

 		u8 change;
 		u8 prev_state = drvdata->re_state;
 		/* Read Gray-coded state */
 		u8 state = (data[byte] >> bit) & 0x3;
 		/* Encode state change into 2-bit signed integer */
 		if ((prev_state == 1 && state == 0) ||
 		    (prev_state == 2 && state == 3)) {
 			change = 1;
 		} else if ((prev_state == 2 && state == 0) ||
 			   (prev_state == 1 && state == 3)) {
 			change = 3;
 		} else {
 			change = 0;
 		}
 		/* Write change */
 		data[byte] = (data[byte] & ~((u8)3 << bit)) |
 				(change << bit);
 		/* Remember state */
 		drvdata->re_state = state;
 	}

 	/* If need to, and can, transform the touch ring reports */
 	if (frame->touch_byte > 0 && frame->touch_byte < size) {
 		__s8 value = data[frame->touch_byte];

 		if (value != 0) {
 			if (frame->touch_flip_at != 0) {
 				value = frame->touch_flip_at - value;
 				if (value <= 0)
 					value = frame->touch_max + value;
 			}
 			data[frame->touch_byte] = value - 1;
 		}
 	}

 	/* If need to, and can, transform the bitmap dial reports */
 	if (frame->bitmap_dial_byte > 0 && frame->bitmap_dial_byte < size) {
 		if (data[frame->bitmap_dial_byte] == 2)
 			data[frame->bitmap_dial_byte] = -1;
 	}

 	return 0;
 }

 static int uclogic_raw_event(struct hid_device *hdev,
 				struct hid_report *report,
 				u8 *data, int size)
 {
 	unsigned int report_id = report->id;
 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
 	struct uclogic_params *params = &drvdata->params;
 	struct uclogic_params_pen_subreport *subreport;
 	struct uclogic_params_pen_subreport *subreport_list_end;
 	size_t i;

 	/* Do not handle anything but input reports */
 	if (report->type != HID_INPUT_REPORT)
 		return 0;

 	if (uclogic_exec_event_hook(params, data, size))
 		return 0;

 	while (true) {
 		/* Tweak pen reports, if necessary */
 		if ((report_id == params->pen.id) && (size >= 2)) {
 			subreport_list_end =
 				params->pen.subreport_list +
 				ARRAY_SIZE(params->pen.subreport_list);
 			/* Try to match a subreport */
 			for (subreport = params->pen.subreport_list;
 			     subreport < subreport_list_end; subreport++) {
 				if (subreport->value != 0 &&
 				    subreport->value == data[1]) {
 					break;
 				}
 			}
 			/* If a subreport matched */
 			if (subreport < subreport_list_end) {
 				/* Change to subreport ID, and restart */
 				report_id = data[0] = subreport->id;
 				continue;
 			} else {
 				return uclogic_raw_event_pen(drvdata, data, size);
 			}
 		}

 		/* Tweak frame control reports, if necessary */
 		for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
 			if (report_id == params->frame_list[i].id) {
 				return uclogic_raw_event_frame(
 					drvdata, &params->frame_list[i],
 					data, size);
 			}
 		}

 		break;
 	}

 	return 0;
 }

 static void uclogic_remove(struct hid_device *hdev)
 {
 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);

 	del_timer_sync(&drvdata->inrange_timer);
 	hid_hw_stop(hdev);
 	kfree(drvdata->desc_ptr);
 	uclogic_params_cleanup(&drvdata->params);
 }

 static const struct hid_device_id uclogic_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_TABLET_PF1209) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
 				USB_DEVICE_ID_HUION_TABLET) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
 				USB_DEVICE_ID_HUION_TABLET2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_TRUST,
 				USB_DEVICE_ID_TRUST_PANORA_TABLET) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_HUION_TABLET) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_YIYNOVA_TABLET) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_81) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_45) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_47) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 				USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
 				USB_DEVICE_ID_UGTIZER_TABLET_GP0610) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
 				USB_DEVICE_ID_UGTIZER_TABLET_GT5040) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_PARBLO_A610_PRO) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_TABLET_G5) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_TABLET_EX07S) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_TABLET_RAINBOW_CV720) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01_V2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_MW),
 		.driver_data = UCLOGIC_MOUSE_FRAME_QUIRK | UCLOGIC_BATTERY_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_S) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_SW),
 		.driver_data = UCLOGIC_MOUSE_FRAME_QUIRK | UCLOGIC_BATTERY_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_STAR06) },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, uclogic_devices);

 static struct hid_driver uclogic_driver = {
 	.name = "uclogic",
 	.id_table = uclogic_devices,
 	.probe = uclogic_probe,
 	.remove = uclogic_remove,
 	.report_fixup = uclogic_report_fixup,
 	.raw_event = uclogic_raw_event,
 	.input_mapping = uclogic_input_mapping,
 	.input_configured = uclogic_input_configured,
 #ifdef CONFIG_PM
 	.resume	          = uclogic_resume,
 	.reset_resume     = uclogic_resume,
 #endif
 };
 module_hid_driver(uclogic_driver);

 MODULE_AUTHOR("Martin Rusko");
 MODULE_AUTHOR("Nikolai Kondrashov");
 MODULE_LICENSE("GPL");

 #ifdef CONFIG_HID_KUNIT_TEST
 #include "hid-uclogic-core-test.c"
 #endif
	// 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.
	*/

	#include <linux/device.h>
	#include <linux/hid.h>
	#include <linux/module.h>
	#include <linux/timer.h>
	#include "usbhid/usbhid.h"
	#include "hid-uclogic-params.h"

	#include "hid-ids.h"

	/**
	* 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;

	/* Discard invalid pen usages */
	if (params->pen.usage_invalid && (field->application == HID_DG_PEN))
	return -1;

	/* Let hid-core decide what to do */
	return 0;
	}

	static int uclogic_input_configured(struct hid_device *hdev,
	struct hid_input *hi)
	{
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
	struct uclogic_params *params = &drvdata->params;
	char *name;
	const char *suffix = NULL;
	struct hid_field *field;
	size_t len;
	size_t i;
	const struct uclogic_params_frame *frame;

	/* no report associated (HID_QUIRK_MULTI_INPUT not set) */
	if (!hi->report)
	return 0;

	/*
	* If this is the input corresponding to the pen report
	* in need of tweaking.
	*/
	if (hi->report->id == params->pen.id) {
	/* Remember the input device so we can simulate events */
	drvdata->pen_input = hi->input;
	}

	/* If it's one of the frame devices */
	for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
	frame = &params->frame_list[i];
	if (hi->report->id == frame->id) {
	/* Assign custom suffix, if any */
	suffix = frame->suffix;
	/*
	* Disable EV_MSC reports for touch ring interfaces to
	* make the Wacom driver pickup touch ring extents
	*/
	if (frame->touch_byte > 0)
	__clear_bit(EV_MSC, hi->input->evbit);
	}
	}

	if (!suffix) {
	field = hi->report->field[0];

	switch (field->application) {
	case HID_GD_KEYBOARD:
	suffix = "Keyboard";
	break;
	case HID_GD_MOUSE:
	suffix = "Mouse";
	break;
	case HID_GD_KEYPAD:
	suffix = "Pad";
	break;
	case HID_DG_PEN:
	case HID_DG_DIGITIZER:
	suffix = "Pen";
	break;
	case HID_CP_CONSUMER_CONTROL:
	suffix = "Consumer Control";
	break;
	case HID_GD_SYSTEM_CONTROL:
	suffix = "System Control";
	break;
	}
	}

	if (suffix) {
	len = strlen(hdev->name) + 2 + strlen(suffix);
	name = devm_kzalloc(&hi->input->dev, len, GFP_KERNEL);
	if (name) {
	snprintf(name, len, "%s %s", hdev->name, suffix);
	hi->input->name = name;
	}
	}

	return 0;
	}

	static int uclogic_probe(struct hid_device *hdev,
	const struct hid_device_id *id)
	{
	int rc;
	struct uclogic_drvdata *drvdata = NULL;
	bool params_initialized = false;

	if (!hid_is_usb(hdev))
	return -EINVAL;

	/*
	* libinput requires the pad interface to be on a different node
	* than the pen, so use QUIRK_MULTI_INPUT for all tablets.
	*/
	hdev->quirks \|= HID_QUIRK_MULTI_INPUT;
	hdev->quirks \|= HID_QUIRK_HIDINPUT_FORCE;

	/* Allocate and assign driver data */
	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
	if (drvdata == NULL) {
	rc = -ENOMEM;
	goto failure;
	}
	timer_setup(&drvdata->inrange_timer, uclogic_inrange_timeout, 0);
	drvdata->re_state = U8_MAX;
	drvdata->quirks = id->driver_data;
	hid_set_drvdata(hdev, drvdata);

	/* Initialize the device and retrieve interface parameters */
	rc = uclogic_params_init(&drvdata->params, hdev);
	if (rc != 0) {
	hid_err(hdev, "failed probing parameters: %d\n", rc);
	goto failure;
	}
	params_initialized = true;
	hid_dbg(hdev, "parameters:\n");
	uclogic_params_hid_dbg(hdev, &drvdata->params);
	if (drvdata->params.invalid) {
	hid_info(hdev, "interface is invalid, ignoring\n");
	rc = -ENODEV;
	goto failure;
	}

	/* Generate replacement report descriptor */
	rc = uclogic_params_get_desc(&drvdata->params,
	&drvdata->desc_ptr,
	&drvdata->desc_size);
	if (rc) {
	hid_err(hdev,
	"failed generating replacement report descriptor: %d\n",
	rc);
	goto failure;
	}

	rc = hid_parse(hdev);
	if (rc) {
	hid_err(hdev, "parse failed\n");
	goto failure;
	}

	rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (rc) {
	hid_err(hdev, "hw start failed\n");
	goto failure;
	}

	return 0;
	failure:
	/* Assume "remove" might not be called if "probe" failed */
	if (params_initialized)
	uclogic_params_cleanup(&drvdata->params);
	return rc;
	}

	#ifdef CONFIG_PM
	static int uclogic_resume(struct hid_device *hdev)
	{
	int rc;
	struct uclogic_params params;

	/* Re-initialize the device, but discard parameters */
	rc = uclogic_params_init(&params, hdev);
	if (rc != 0)
	hid_err(hdev, "failed to re-initialize the device\n");
	else
	uclogic_params_cleanup(&params);

	return rc;
	}
	#endif

	/**
	* uclogic_exec_event_hook - if the received event is hooked schedules the
	* associated work.
	*
	* @p: Tablet interface report parameters.
	* @event: Raw event.
	* @size: The size of event.
	*
	* Returns:
	* Whether the event was hooked or not.
	*/
	static bool uclogic_exec_event_hook(struct uclogic_params p, u8 event, int size)
	{
	struct uclogic_raw_event_hook *curr;

	if (!p->event_hooks)
	return false;

	list_for_each_entry(curr, &p->event_hooks->list, list) {
	if (curr->size == size && memcmp(curr->event, event, size) == 0) {
	schedule_work(&curr->work);
	return true;
	}
	}

	return false;
	}

	/**
	* uclogic_raw_event_pen - handle raw pen events (pen HID reports).
	*
	* @drvdata: Driver data.
	* @data: Report data buffer, can be modified.
	* @size: Report data size, bytes.
	*
	* Returns:
	* Negative value on error (stops event delivery), zero for success.
	*/
	static int uclogic_raw_event_pen(struct uclogic_drvdata *drvdata,
	u8 *data, int size)
	{
	struct uclogic_params_pen *pen = &drvdata->params.pen;

	WARN_ON(drvdata == NULL);
	WARN_ON(data == NULL && size != 0);

	/* If in-range reports are inverted */
	if (pen->inrange ==
	UCLOGIC_PARAMS_PEN_INRANGE_INVERTED) {
	/* Invert the in-range bit */
	data[1] ^= 0x40;
	}
	/*
	* If report contains fragmented high-resolution pen
	* coordinates
	*/
	if (size >= 10 && pen->fragmented_hires) {
	u8 pressure_low_byte;
	u8 pressure_high_byte;

	/* Lift pressure bytes */
	pressure_low_byte = data[6];
	pressure_high_byte = data[7];
	/*
	* Move Y coord to make space for high-order X
	* coord byte
	*/
	data[6] = data[5];
	data[5] = data[4];
	/* Move high-order X coord byte */
	data[4] = data[8];
	/* Move high-order Y coord byte */
	data[7] = data[9];
	/* Place pressure bytes */
	data[8] = pressure_low_byte;
	data[9] = pressure_high_byte;
	}
	/* If we need to emulate in-range detection */
	if (pen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE) {
	/* Set in-range bit */
	data[1] \|= 0x40;
	/* (Re-)start in-range timeout */
	mod_timer(&drvdata->inrange_timer,
	jiffies + msecs_to_jiffies(100));
	}
	/* If we report tilt and Y direction is flipped */
	if (size >= 12 && pen->tilt_y_flipped)
	data[11] = -data[11];

	return 0;
	}

	/**
	* uclogic_raw_event_frame - handle raw frame events (frame HID reports).
	*
	* @drvdata: Driver data.
	* @frame: The parameters of the frame controls to handle.
	* @data: Report data buffer, can be modified.
	* @size: Report data size, bytes.
	*
	* Returns:
	* Negative value on error (stops event delivery), zero for success.
	*/
	static int uclogic_raw_event_frame(
	struct uclogic_drvdata *drvdata,
	const struct uclogic_params_frame *frame,
	u8 *data, int size)
	{
	WARN_ON(drvdata == NULL);
	WARN_ON(data == NULL && size != 0);

	/* If need to, and can, set pad device ID for Wacom drivers */
	if (frame->dev_id_byte > 0 && frame->dev_id_byte < size) {
	/* If we also have a touch ring and the finger left it */
	if (frame->touch_byte > 0 && frame->touch_byte < size &&
	data[frame->touch_byte] == 0) {
	data[frame->dev_id_byte] = 0;
	} else {
	data[frame->dev_id_byte] = 0xf;
	}
	}

	/* If need to, and can, read rotary encoder state change */
	if (frame->re_lsb > 0 && frame->re_lsb / 8 < size) {
	unsigned int byte = frame->re_lsb / 8;
	unsigned int bit = frame->re_lsb % 8;

	u8 change;
	u8 prev_state = drvdata->re_state;
	/* Read Gray-coded state */
	u8 state = (data[byte] >> bit) & 0x3;
	/* Encode state change into 2-bit signed integer */
	if ((prev_state == 1 && state == 0) \|\|
	(prev_state == 2 && state == 3)) {
	change = 1;
	} else if ((prev_state == 2 && state == 0) \|\|
	(prev_state == 1 && state == 3)) {
	change = 3;
	} else {
	change = 0;
	}
	/* Write change */
	data[byte] = (data[byte] & ~((u8)3 << bit)) \|
	(change << bit);
	/* Remember state */
	drvdata->re_state = state;
	}

	/* If need to, and can, transform the touch ring reports */
	if (frame->touch_byte > 0 && frame->touch_byte < size) {
	__s8 value = data[frame->touch_byte];

	if (value != 0) {
	if (frame->touch_flip_at != 0) {
	value = frame->touch_flip_at - value;
	if (value <= 0)
	value = frame->touch_max + value;
	}
	data[frame->touch_byte] = value - 1;
	}
	}

	/* If need to, and can, transform the bitmap dial reports */
	if (frame->bitmap_dial_byte > 0 && frame->bitmap_dial_byte < size) {
	if (data[frame->bitmap_dial_byte] == 2)
	data[frame->bitmap_dial_byte] = -1;
	}

	return 0;
	}

	static int uclogic_raw_event(struct hid_device *hdev,
	struct hid_report *report,
	u8 *data, int size)
	{
	unsigned int report_id = report->id;
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
	struct uclogic_params *params = &drvdata->params;
	struct uclogic_params_pen_subreport *subreport;
	struct uclogic_params_pen_subreport *subreport_list_end;
	size_t i;

	/* Do not handle anything but input reports */
	if (report->type != HID_INPUT_REPORT)
	return 0;

	if (uclogic_exec_event_hook(params, data, size))
	return 0;

	while (true) {
	/* Tweak pen reports, if necessary */
	if ((report_id == params->pen.id) && (size >= 2)) {
	subreport_list_end =
	params->pen.subreport_list +
	ARRAY_SIZE(params->pen.subreport_list);
	/* Try to match a subreport */
	for (subreport = params->pen.subreport_list;
	subreport < subreport_list_end; subreport++) {
	if (subreport->value != 0 &&
	subreport->value == data[1]) {
	break;
	}
	}
	/* If a subreport matched */
	if (subreport < subreport_list_end) {
	/* Change to subreport ID, and restart */
	report_id = data[0] = subreport->id;
	continue;
	} else {
	return uclogic_raw_event_pen(drvdata, data, size);
	}
	}

	/* Tweak frame control reports, if necessary */
	for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
	if (report_id == params->frame_list[i].id) {
	return uclogic_raw_event_frame(
	drvdata, &params->frame_list[i],
	data, size);
	}
	}

	break;
	}

	return 0;
	}

	static void uclogic_remove(struct hid_device *hdev)
	{
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);

	del_timer_sync(&drvdata->inrange_timer);
	hid_hw_stop(hdev);
	kfree(drvdata->desc_ptr);
	uclogic_params_cleanup(&drvdata->params);
	}

	static const struct hid_device_id uclogic_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_TABLET_PF1209) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
	USB_DEVICE_ID_HUION_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
	USB_DEVICE_ID_HUION_TABLET2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_TRUST,
	USB_DEVICE_ID_TRUST_PANORA_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_HUION_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_YIYNOVA_TABLET) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_81) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_45) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_47) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
	USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
	USB_DEVICE_ID_UGTIZER_TABLET_GP0610) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
	USB_DEVICE_ID_UGTIZER_TABLET_GT5040) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_PARBLO_A610_PRO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_TABLET_G5) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_TABLET_EX07S) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_TABLET_RAINBOW_CV720) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01_V2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_MW),
	.driver_data = UCLOGIC_MOUSE_FRAME_QUIRK \| UCLOGIC_BATTERY_QUIRK },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_S) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_PRO_SW),
	.driver_data = UCLOGIC_MOUSE_FRAME_QUIRK \| UCLOGIC_BATTERY_QUIRK },
	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
	USB_DEVICE_ID_UGEE_XPPEN_TABLET_STAR06) },
	{ }
	};
	MODULE_DEVICE_TABLE(hid, uclogic_devices);

	static struct hid_driver uclogic_driver = {
	.name = "uclogic",
	.id_table = uclogic_devices,
	.probe = uclogic_probe,
	.remove = uclogic_remove,
	.report_fixup = uclogic_report_fixup,
	.raw_event = uclogic_raw_event,
	.input_mapping = uclogic_input_mapping,
	.input_configured = uclogic_input_configured,
	#ifdef CONFIG_PM
	.resume = uclogic_resume,
	.reset_resume = uclogic_resume,
	#endif
	};
	module_hid_driver(uclogic_driver);

	MODULE_AUTHOR("Martin Rusko");
	MODULE_AUTHOR("Nikolai Kondrashov");
	MODULE_LICENSE("GPL");

	#ifdef CONFIG_HID_KUNIT_TEST
	#include "hid-uclogic-core-test.c"
	#endif