1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  HID driver for UC-Logic devices not fully compliant with HID standard
4  *
5  *  Copyright (c) 2010-2014 Nikolai Kondrashov
6  *  Copyright (c) 2013 Martin Rusko
7  */
8 
9 /*
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)
13  * any later version.
14  */
15 
16 #include <linux/device.h>
17 #include <linux/hid.h>
18 #include <linux/module.h>
19 #include <linux/timer.h>
20 #include "usbhid/usbhid.h"
21 #include "hid-uclogic-params.h"
22 
23 #include "hid-ids.h"
24 
25 /* Driver data */
26 struct uclogic_drvdata {
27 	/* Interface parameters */
28 	struct uclogic_params params;
29 	/* Pointer to the replacement report descriptor. NULL if none. */
30 	__u8 *desc_ptr;
31 	/*
32 	 * Size of the replacement report descriptor.
33 	 * Only valid if desc_ptr is not NULL
34 	 */
35 	unsigned int desc_size;
36 	/* Pen input device */
37 	struct input_dev *pen_input;
38 	/* In-range timer */
39 	struct timer_list inrange_timer;
40 	/* Last rotary encoder state, or U8_MAX for none */
41 	u8 re_state;
42 };
43 
44 /**
45  * uclogic_inrange_timeout - handle pen in-range state timeout.
46  * Emulate input events normally generated when pen goes out of range for
47  * tablets which don't report that.
48  *
49  * @t:	The timer the timeout handler is attached to, stored in a struct
50  *	uclogic_drvdata.
51  */
52 static void uclogic_inrange_timeout(struct timer_list *t)
53 {
54 	struct uclogic_drvdata *drvdata = from_timer(drvdata, t,
55 							inrange_timer);
56 	struct input_dev *input = drvdata->pen_input;
57 
58 	if (input == NULL)
59 		return;
60 	input_report_abs(input, ABS_PRESSURE, 0);
61 	/* If BTN_TOUCH state is changing */
62 	if (test_bit(BTN_TOUCH, input->key)) {
63 		input_event(input, EV_MSC, MSC_SCAN,
64 				/* Digitizer Tip Switch usage */
65 				0xd0042);
66 		input_report_key(input, BTN_TOUCH, 0);
67 	}
68 	input_report_key(input, BTN_TOOL_PEN, 0);
69 	input_sync(input);
70 }
71 
72 static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
73 					unsigned int *rsize)
74 {
75 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
76 
77 	if (drvdata->desc_ptr != NULL) {
78 		rdesc = drvdata->desc_ptr;
79 		*rsize = drvdata->desc_size;
80 	}
81 	return rdesc;
82 }
83 
84 static int uclogic_input_mapping(struct hid_device *hdev,
85 				 struct hid_input *hi,
86 				 struct hid_field *field,
87 				 struct hid_usage *usage,
88 				 unsigned long **bit,
89 				 int *max)
90 {
91 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
92 	struct uclogic_params *params = &drvdata->params;
93 
94 	/* Discard invalid pen usages */
95 	if (params->pen.usage_invalid && (field->application == HID_DG_PEN))
96 		return -1;
97 
98 	/* Let hid-core decide what to do */
99 	return 0;
100 }
101 
102 static int uclogic_input_configured(struct hid_device *hdev,
103 		struct hid_input *hi)
104 {
105 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
106 	struct uclogic_params *params = &drvdata->params;
107 	char *name;
108 	const char *suffix = NULL;
109 	struct hid_field *field;
110 	size_t len;
111 	size_t i;
112 	const struct uclogic_params_frame *frame;
113 
114 	/* no report associated (HID_QUIRK_MULTI_INPUT not set) */
115 	if (!hi->report)
116 		return 0;
117 
118 	/*
119 	 * If this is the input corresponding to the pen report
120 	 * in need of tweaking.
121 	 */
122 	if (hi->report->id == params->pen.id) {
123 		/* Remember the input device so we can simulate events */
124 		drvdata->pen_input = hi->input;
125 	}
126 
127 	/* If it's one of the frame devices */
128 	for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
129 		frame = &params->frame_list[i];
130 		if (hi->report->id == frame->id) {
131 			/* Assign custom suffix, if any */
132 			suffix = frame->suffix;
133 			/*
134 			 * Disable EV_MSC reports for touch ring interfaces to
135 			 * make the Wacom driver pickup touch ring extents
136 			 */
137 			if (frame->touch_byte > 0)
138 				__clear_bit(EV_MSC, hi->input->evbit);
139 		}
140 	}
141 
142 	if (!suffix) {
143 		field = hi->report->field[0];
144 
145 		switch (field->application) {
146 		case HID_GD_KEYBOARD:
147 			suffix = "Keyboard";
148 			break;
149 		case HID_GD_MOUSE:
150 			suffix = "Mouse";
151 			break;
152 		case HID_GD_KEYPAD:
153 			suffix = "Pad";
154 			break;
155 		case HID_DG_PEN:
156 			suffix = "Pen";
157 			break;
158 		case HID_CP_CONSUMER_CONTROL:
159 			suffix = "Consumer Control";
160 			break;
161 		case HID_GD_SYSTEM_CONTROL:
162 			suffix = "System Control";
163 			break;
164 		}
165 	}
166 
167 	if (suffix) {
168 		len = strlen(hdev->name) + 2 + strlen(suffix);
169 		name = devm_kzalloc(&hi->input->dev, len, GFP_KERNEL);
170 		if (name) {
171 			snprintf(name, len, "%s %s", hdev->name, suffix);
172 			hi->input->name = name;
173 		}
174 	}
175 
176 	return 0;
177 }
178 
179 static int uclogic_probe(struct hid_device *hdev,
180 		const struct hid_device_id *id)
181 {
182 	int rc;
183 	struct uclogic_drvdata *drvdata = NULL;
184 	bool params_initialized = false;
185 
186 	if (!hid_is_usb(hdev))
187 		return -EINVAL;
188 
189 	/*
190 	 * libinput requires the pad interface to be on a different node
191 	 * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
192 	 */
193 	hdev->quirks |= HID_QUIRK_MULTI_INPUT;
194 
195 	/* Allocate and assign driver data */
196 	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
197 	if (drvdata == NULL) {
198 		rc = -ENOMEM;
199 		goto failure;
200 	}
201 	timer_setup(&drvdata->inrange_timer, uclogic_inrange_timeout, 0);
202 	drvdata->re_state = U8_MAX;
203 	hid_set_drvdata(hdev, drvdata);
204 
205 	/* Initialize the device and retrieve interface parameters */
206 	rc = uclogic_params_init(&drvdata->params, hdev);
207 	if (rc != 0) {
208 		hid_err(hdev, "failed probing parameters: %d\n", rc);
209 		goto failure;
210 	}
211 	params_initialized = true;
212 	hid_dbg(hdev, "parameters:\n");
213 	uclogic_params_hid_dbg(hdev, &drvdata->params);
214 	if (drvdata->params.invalid) {
215 		hid_info(hdev, "interface is invalid, ignoring\n");
216 		rc = -ENODEV;
217 		goto failure;
218 	}
219 
220 	/* Generate replacement report descriptor */
221 	rc = uclogic_params_get_desc(&drvdata->params,
222 				     &drvdata->desc_ptr,
223 				     &drvdata->desc_size);
224 	if (rc) {
225 		hid_err(hdev,
226 			"failed generating replacement report descriptor: %d\n",
227 			rc);
228 		goto failure;
229 	}
230 
231 	rc = hid_parse(hdev);
232 	if (rc) {
233 		hid_err(hdev, "parse failed\n");
234 		goto failure;
235 	}
236 
237 	rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
238 	if (rc) {
239 		hid_err(hdev, "hw start failed\n");
240 		goto failure;
241 	}
242 
243 	return 0;
244 failure:
245 	/* Assume "remove" might not be called if "probe" failed */
246 	if (params_initialized)
247 		uclogic_params_cleanup(&drvdata->params);
248 	return rc;
249 }
250 
251 #ifdef CONFIG_PM
252 static int uclogic_resume(struct hid_device *hdev)
253 {
254 	int rc;
255 	struct uclogic_params params;
256 
257 	/* Re-initialize the device, but discard parameters */
258 	rc = uclogic_params_init(&params, hdev);
259 	if (rc != 0)
260 		hid_err(hdev, "failed to re-initialize the device\n");
261 	else
262 		uclogic_params_cleanup(&params);
263 
264 	return rc;
265 }
266 #endif
267 
268 /**
269  * uclogic_raw_event_pen - handle raw pen events (pen HID reports).
270  *
271  * @drvdata:	Driver data.
272  * @data:	Report data buffer, can be modified.
273  * @size:	Report data size, bytes.
274  *
275  * Returns:
276  *	Negative value on error (stops event delivery), zero for success.
277  */
278 static int uclogic_raw_event_pen(struct uclogic_drvdata *drvdata,
279 					u8 *data, int size)
280 {
281 	struct uclogic_params_pen *pen = &drvdata->params.pen;
282 
283 	WARN_ON(drvdata == NULL);
284 	WARN_ON(data == NULL && size != 0);
285 
286 	/* If in-range reports are inverted */
287 	if (pen->inrange ==
288 		UCLOGIC_PARAMS_PEN_INRANGE_INVERTED) {
289 		/* Invert the in-range bit */
290 		data[1] ^= 0x40;
291 	}
292 	/*
293 	 * If report contains fragmented high-resolution pen
294 	 * coordinates
295 	 */
296 	if (size >= 10 && pen->fragmented_hires) {
297 		u8 pressure_low_byte;
298 		u8 pressure_high_byte;
299 
300 		/* Lift pressure bytes */
301 		pressure_low_byte = data[6];
302 		pressure_high_byte = data[7];
303 		/*
304 		 * Move Y coord to make space for high-order X
305 		 * coord byte
306 		 */
307 		data[6] = data[5];
308 		data[5] = data[4];
309 		/* Move high-order X coord byte */
310 		data[4] = data[8];
311 		/* Move high-order Y coord byte */
312 		data[7] = data[9];
313 		/* Place pressure bytes */
314 		data[8] = pressure_low_byte;
315 		data[9] = pressure_high_byte;
316 	}
317 	/* If we need to emulate in-range detection */
318 	if (pen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE) {
319 		/* Set in-range bit */
320 		data[1] |= 0x40;
321 		/* (Re-)start in-range timeout */
322 		mod_timer(&drvdata->inrange_timer,
323 				jiffies + msecs_to_jiffies(100));
324 	}
325 	/* If we report tilt and Y direction is flipped */
326 	if (size >= 12 && pen->tilt_y_flipped)
327 		data[11] = -data[11];
328 
329 	return 0;
330 }
331 
332 /**
333  * uclogic_raw_event_frame - handle raw frame events (frame HID reports).
334  *
335  * @drvdata:	Driver data.
336  * @frame:	The parameters of the frame controls to handle.
337  * @data:	Report data buffer, can be modified.
338  * @size:	Report data size, bytes.
339  *
340  * Returns:
341  *	Negative value on error (stops event delivery), zero for success.
342  */
343 static int uclogic_raw_event_frame(
344 		struct uclogic_drvdata *drvdata,
345 		const struct uclogic_params_frame *frame,
346 		u8 *data, int size)
347 {
348 	WARN_ON(drvdata == NULL);
349 	WARN_ON(data == NULL && size != 0);
350 
351 	/* If need to, and can, set pad device ID for Wacom drivers */
352 	if (frame->dev_id_byte > 0 && frame->dev_id_byte < size) {
353 		/* If we also have a touch ring and the finger left it */
354 		if (frame->touch_byte > 0 && frame->touch_byte < size &&
355 		    data[frame->touch_byte] == 0) {
356 			data[frame->dev_id_byte] = 0;
357 		} else {
358 			data[frame->dev_id_byte] = 0xf;
359 		}
360 	}
361 
362 	/* If need to, and can, read rotary encoder state change */
363 	if (frame->re_lsb > 0 && frame->re_lsb / 8 < size) {
364 		unsigned int byte = frame->re_lsb / 8;
365 		unsigned int bit = frame->re_lsb % 8;
366 
367 		u8 change;
368 		u8 prev_state = drvdata->re_state;
369 		/* Read Gray-coded state */
370 		u8 state = (data[byte] >> bit) & 0x3;
371 		/* Encode state change into 2-bit signed integer */
372 		if ((prev_state == 1 && state == 0) ||
373 		    (prev_state == 2 && state == 3)) {
374 			change = 1;
375 		} else if ((prev_state == 2 && state == 0) ||
376 			   (prev_state == 1 && state == 3)) {
377 			change = 3;
378 		} else {
379 			change = 0;
380 		}
381 		/* Write change */
382 		data[byte] = (data[byte] & ~((u8)3 << bit)) |
383 				(change << bit);
384 		/* Remember state */
385 		drvdata->re_state = state;
386 	}
387 
388 	/* If need to, and can, transform the touch ring reports */
389 	if (frame->touch_byte > 0 && frame->touch_byte < size) {
390 		__s8 value = data[frame->touch_byte];
391 
392 		if (value != 0) {
393 			if (frame->touch_flip_at != 0) {
394 				value = frame->touch_flip_at - value;
395 				if (value <= 0)
396 					value = frame->touch_max + value;
397 			}
398 			data[frame->touch_byte] = value - 1;
399 		}
400 	}
401 
402 	/* If need to, and can, transform the bitmap dial reports */
403 	if (frame->bitmap_dial_byte > 0 && frame->bitmap_dial_byte < size) {
404 		if (data[frame->bitmap_dial_byte] == 2)
405 			data[frame->bitmap_dial_byte] = -1;
406 	}
407 
408 	return 0;
409 }
410 
411 static int uclogic_raw_event(struct hid_device *hdev,
412 				struct hid_report *report,
413 				u8 *data, int size)
414 {
415 	unsigned int report_id = report->id;
416 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
417 	struct uclogic_params *params = &drvdata->params;
418 	struct uclogic_params_pen_subreport *subreport;
419 	struct uclogic_params_pen_subreport *subreport_list_end;
420 	size_t i;
421 
422 	/* Do not handle anything but input reports */
423 	if (report->type != HID_INPUT_REPORT)
424 		return 0;
425 
426 	while (true) {
427 		/* Tweak pen reports, if necessary */
428 		if ((report_id == params->pen.id) && (size >= 2)) {
429 			subreport_list_end =
430 				params->pen.subreport_list +
431 				ARRAY_SIZE(params->pen.subreport_list);
432 			/* Try to match a subreport */
433 			for (subreport = params->pen.subreport_list;
434 			     subreport < subreport_list_end; subreport++) {
435 				if (subreport->value != 0 &&
436 				    subreport->value == data[1]) {
437 					break;
438 				}
439 			}
440 			/* If a subreport matched */
441 			if (subreport < subreport_list_end) {
442 				/* Change to subreport ID, and restart */
443 				report_id = data[0] = subreport->id;
444 				continue;
445 			} else {
446 				return uclogic_raw_event_pen(drvdata, data, size);
447 			}
448 		}
449 
450 		/* Tweak frame control reports, if necessary */
451 		for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) {
452 			if (report_id == params->frame_list[i].id) {
453 				return uclogic_raw_event_frame(
454 					drvdata, &params->frame_list[i],
455 					data, size);
456 			}
457 		}
458 
459 		break;
460 	}
461 
462 	return 0;
463 }
464 
465 static void uclogic_remove(struct hid_device *hdev)
466 {
467 	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
468 
469 	del_timer_sync(&drvdata->inrange_timer);
470 	hid_hw_stop(hdev);
471 	kfree(drvdata->desc_ptr);
472 	uclogic_params_cleanup(&drvdata->params);
473 }
474 
475 static const struct hid_device_id uclogic_devices[] = {
476 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
477 				USB_DEVICE_ID_UCLOGIC_TABLET_PF1209) },
478 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
479 				USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U) },
480 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
481 				USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U) },
482 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
483 				USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U) },
484 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
485 				USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
486 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
487 				USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
488 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
489 				USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
490 	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
491 				USB_DEVICE_ID_HUION_TABLET) },
492 	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
493 				USB_DEVICE_ID_HUION_TABLET2) },
494 	{ HID_USB_DEVICE(USB_VENDOR_ID_TRUST,
495 				USB_DEVICE_ID_TRUST_PANORA_TABLET) },
496 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
497 				USB_DEVICE_ID_HUION_TABLET) },
498 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
499 				USB_DEVICE_ID_YIYNOVA_TABLET) },
500 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
501 				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_81) },
502 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
503 				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_45) },
504 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
505 				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_47) },
506 	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
507 				USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3) },
508 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
509 				USB_DEVICE_ID_UGTIZER_TABLET_GP0610) },
510 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
511 				USB_DEVICE_ID_UGTIZER_TABLET_GT5040) },
512 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
513 				USB_DEVICE_ID_UGEE_TABLET_G5) },
514 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
515 				USB_DEVICE_ID_UGEE_TABLET_EX07S) },
516 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
517 				USB_DEVICE_ID_UGEE_TABLET_RAINBOW_CV720) },
518 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
519 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540) },
520 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
521 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640) },
522 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
523 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01) },
524 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
525 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_STAR06) },
526 	{ }
527 };
528 MODULE_DEVICE_TABLE(hid, uclogic_devices);
529 
530 static struct hid_driver uclogic_driver = {
531 	.name = "uclogic",
532 	.id_table = uclogic_devices,
533 	.probe = uclogic_probe,
534 	.remove = uclogic_remove,
535 	.report_fixup = uclogic_report_fixup,
536 	.raw_event = uclogic_raw_event,
537 	.input_mapping = uclogic_input_mapping,
538 	.input_configured = uclogic_input_configured,
539 #ifdef CONFIG_PM
540 	.resume	          = uclogic_resume,
541 	.reset_resume     = uclogic_resume,
542 #endif
543 };
544 module_hid_driver(uclogic_driver);
545 
546 MODULE_AUTHOR("Martin Rusko");
547 MODULE_AUTHOR("Nikolai Kondrashov");
548 MODULE_LICENSE("GPL");
549