summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-uclogic-core.c
blob: 86b568037cb8af6ed004c4067f4d4314d3ed04b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
// 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"

/* 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;

	/* discard the unused pen interface */
	if (params->pen_unused && (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;

	/* 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;
	}

	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:
		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;

	/*
	 * 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;

	/* 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;
	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_FMT_STR,
		UCLOGIC_PARAMS_FMT_ARGS(&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

static int uclogic_raw_event(struct hid_device *hdev,
				struct hid_report *report,
				u8 *data, int size)
{
	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
	struct uclogic_params *params = &drvdata->params;

	/* Tweak pen reports, if necessary */
	if (!params->pen_unused &&
	    (report->type == HID_INPUT_REPORT) &&
	    (report->id == params->pen.id) &&
	    (size >= 2)) {
		/* If it's the "virtual" frame controls report */
		if (params->frame.id != 0 &&
		    data[1] & params->pen_frame_flag) {
			/* Change to virtual frame controls report ID */
			data[0] = params->frame.id;
			return 0;
		}
		/* If in-range reports are inverted */
		if (params->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 && params->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 (params->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));
		}
	}

	/* Tweak frame control reports, if necessary */
	if ((report->type == HID_INPUT_REPORT) &&
	    (report->id == params->frame.id)) {
		/* If need to, and can, set pad device ID for Wacom drivers */
		if (params->frame.dev_id_byte > 0 &&
		    params->frame.dev_id_byte < size) {
			data[params->frame.dev_id_byte] = 0xf;
		}
		/* If need to, and can, read rotary encoder state change */
		if (params->frame.re_lsb > 0 &&
		    params->frame.re_lsb / 8 < size) {
			unsigned int byte = params->frame.re_lsb / 8;
			unsigned int bit = params->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;
		}
	}

	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_HS64) },
	{ 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_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) },
	{ }
};
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");