xref: /openbmc/linux/drivers/hid/wacom_sys.c (revision efe4a1ac)
1 /*
2  * drivers/input/tablet/wacom_sys.c
3  *
4  *  USB Wacom tablet support - system specific code
5  */
6 
7 /*
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  */
13 
14 #include "wacom_wac.h"
15 #include "wacom.h"
16 #include <linux/input/mt.h>
17 
18 #define WAC_MSG_RETRIES		5
19 #define WAC_CMD_RETRIES		10
20 
21 #define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
22 #define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
23 #define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
24 
25 static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
26 			    size_t size, unsigned int retries)
27 {
28 	int retval;
29 
30 	do {
31 		retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
32 				HID_REQ_GET_REPORT);
33 	} while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
34 
35 	if (retval < 0)
36 		hid_err(hdev, "wacom_get_report: ran out of retries "
37 			"(last error = %d)\n", retval);
38 
39 	return retval;
40 }
41 
42 static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
43 			    size_t size, unsigned int retries)
44 {
45 	int retval;
46 
47 	do {
48 		retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
49 				HID_REQ_SET_REPORT);
50 	} while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
51 
52 	if (retval < 0)
53 		hid_err(hdev, "wacom_set_report: ran out of retries "
54 			"(last error = %d)\n", retval);
55 
56 	return retval;
57 }
58 
59 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
60 		u8 *raw_data, int size)
61 {
62 	struct wacom *wacom = hid_get_drvdata(hdev);
63 
64 	if (size > WACOM_PKGLEN_MAX)
65 		return 1;
66 
67 	memcpy(wacom->wacom_wac.data, raw_data, size);
68 
69 	wacom_wac_irq(&wacom->wacom_wac, size);
70 
71 	return 0;
72 }
73 
74 static int wacom_open(struct input_dev *dev)
75 {
76 	struct wacom *wacom = input_get_drvdata(dev);
77 
78 	return hid_hw_open(wacom->hdev);
79 }
80 
81 static void wacom_close(struct input_dev *dev)
82 {
83 	struct wacom *wacom = input_get_drvdata(dev);
84 
85 	/*
86 	 * wacom->hdev should never be null, but surprisingly, I had the case
87 	 * once while unplugging the Wacom Wireless Receiver.
88 	 */
89 	if (wacom->hdev)
90 		hid_hw_close(wacom->hdev);
91 }
92 
93 /*
94  * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
95  */
96 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
97 			       unsigned unit, int exponent)
98 {
99 	struct hid_field field = {
100 		.logical_maximum = logical_extents,
101 		.physical_maximum = physical_extents,
102 		.unit = unit,
103 		.unit_exponent = exponent,
104 	};
105 
106 	return hidinput_calc_abs_res(&field, ABS_X);
107 }
108 
109 static void wacom_feature_mapping(struct hid_device *hdev,
110 		struct hid_field *field, struct hid_usage *usage)
111 {
112 	struct wacom *wacom = hid_get_drvdata(hdev);
113 	struct wacom_features *features = &wacom->wacom_wac.features;
114 	struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
115 	unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
116 	u8 *data;
117 	int ret;
118 	int n;
119 
120 	switch (equivalent_usage) {
121 	case HID_DG_CONTACTMAX:
122 		/* leave touch_max as is if predefined */
123 		if (!features->touch_max) {
124 			/* read manually */
125 			data = kzalloc(2, GFP_KERNEL);
126 			if (!data)
127 				break;
128 			data[0] = field->report->id;
129 			ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
130 						data, 2, WAC_CMD_RETRIES);
131 			if (ret == 2) {
132 				features->touch_max = data[1];
133 			} else {
134 				features->touch_max = 16;
135 				hid_warn(hdev, "wacom_feature_mapping: "
136 					 "could not get HID_DG_CONTACTMAX, "
137 					 "defaulting to %d\n",
138 					  features->touch_max);
139 			}
140 			kfree(data);
141 		}
142 		break;
143 	case HID_DG_INPUTMODE:
144 		/* Ignore if value index is out of bounds. */
145 		if (usage->usage_index >= field->report_count) {
146 			dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
147 			break;
148 		}
149 
150 		hid_data->inputmode = field->report->id;
151 		hid_data->inputmode_index = usage->usage_index;
152 		break;
153 
154 	case HID_UP_DIGITIZER:
155 		if (field->report->id == 0x0B &&
156 		    (field->application == WACOM_HID_G9_PEN ||
157 		     field->application == WACOM_HID_G11_PEN)) {
158 			wacom->wacom_wac.mode_report = field->report->id;
159 			wacom->wacom_wac.mode_value = 0;
160 		}
161 		break;
162 
163 	case WACOM_HID_WD_DATAMODE:
164 		wacom->wacom_wac.mode_report = field->report->id;
165 		wacom->wacom_wac.mode_value = 2;
166 		break;
167 
168 	case WACOM_HID_UP_G9:
169 	case WACOM_HID_UP_G11:
170 		if (field->report->id == 0x03 &&
171 		    (field->application == WACOM_HID_G9_TOUCHSCREEN ||
172 		     field->application == WACOM_HID_G11_TOUCHSCREEN)) {
173 			wacom->wacom_wac.mode_report = field->report->id;
174 			wacom->wacom_wac.mode_value = 0;
175 		}
176 		break;
177 	case WACOM_HID_WD_OFFSETLEFT:
178 	case WACOM_HID_WD_OFFSETTOP:
179 	case WACOM_HID_WD_OFFSETRIGHT:
180 	case WACOM_HID_WD_OFFSETBOTTOM:
181 		/* read manually */
182 		n = hid_report_len(field->report);
183 		data = hid_alloc_report_buf(field->report, GFP_KERNEL);
184 		if (!data)
185 			break;
186 		data[0] = field->report->id;
187 		ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
188 					data, n, WAC_CMD_RETRIES);
189 		if (ret == n) {
190 			ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
191 						   data, n, 0);
192 		} else {
193 			hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
194 				 __func__);
195 		}
196 		kfree(data);
197 		break;
198 	}
199 }
200 
201 /*
202  * Interface Descriptor of wacom devices can be incomplete and
203  * inconsistent so wacom_features table is used to store stylus
204  * device's packet lengths, various maximum values, and tablet
205  * resolution based on product ID's.
206  *
207  * For devices that contain 2 interfaces, wacom_features table is
208  * inaccurate for the touch interface.  Since the Interface Descriptor
209  * for touch interfaces has pretty complete data, this function exists
210  * to query tablet for this missing information instead of hard coding in
211  * an additional table.
212  *
213  * A typical Interface Descriptor for a stylus will contain a
214  * boot mouse application collection that is not of interest and this
215  * function will ignore it.
216  *
217  * It also contains a digitizer application collection that also is not
218  * of interest since any information it contains would be duplicate
219  * of what is in wacom_features. Usually it defines a report of an array
220  * of bytes that could be used as max length of the stylus packet returned.
221  * If it happens to define a Digitizer-Stylus Physical Collection then
222  * the X and Y logical values contain valid data but it is ignored.
223  *
224  * A typical Interface Descriptor for a touch interface will contain a
225  * Digitizer-Finger Physical Collection which will define both logical
226  * X/Y maximum as well as the physical size of tablet. Since touch
227  * interfaces haven't supported pressure or distance, this is enough
228  * information to override invalid values in the wacom_features table.
229  *
230  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
231  * data. We deal with them after returning from this function.
232  */
233 static void wacom_usage_mapping(struct hid_device *hdev,
234 		struct hid_field *field, struct hid_usage *usage)
235 {
236 	struct wacom *wacom = hid_get_drvdata(hdev);
237 	struct wacom_features *features = &wacom->wacom_wac.features;
238 	bool finger = WACOM_FINGER_FIELD(field);
239 	bool pen = WACOM_PEN_FIELD(field);
240 
241 	/*
242 	* Requiring Stylus Usage will ignore boot mouse
243 	* X/Y values and some cases of invalid Digitizer X/Y
244 	* values commonly reported.
245 	*/
246 	if (pen)
247 		features->device_type |= WACOM_DEVICETYPE_PEN;
248 	else if (finger)
249 		features->device_type |= WACOM_DEVICETYPE_TOUCH;
250 	else
251 		return;
252 
253 	/*
254 	 * Bamboo models do not support HID_DG_CONTACTMAX.
255 	 * And, Bamboo Pen only descriptor contains touch.
256 	 */
257 	if (features->type > BAMBOO_PT) {
258 		/* ISDv4 touch devices at least supports one touch point */
259 		if (finger && !features->touch_max)
260 			features->touch_max = 1;
261 	}
262 
263 	/*
264 	 * ISDv4 devices which predate HID's adoption of the
265 	 * HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
266 	 * position instead. We can accurately detect if a
267 	 * usage with that value should be HID_DG_BARRELSWITCH2
268 	 * based on the surrounding usages, which have remained
269 	 * constant across generations.
270 	 */
271 	if (features->type == HID_GENERIC &&
272 	    usage->hid == 0x000D0000 &&
273 	    field->application == HID_DG_PEN &&
274 	    field->physical == HID_DG_STYLUS) {
275 		int i = usage->usage_index;
276 
277 		if (i-4 >= 0 && i+1 < field->maxusage &&
278 		    field->usage[i-4].hid == HID_DG_TIPSWITCH &&
279 		    field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
280 		    field->usage[i-2].hid == HID_DG_ERASER &&
281 		    field->usage[i-1].hid == HID_DG_INVERT &&
282 		    field->usage[i+1].hid == HID_DG_INRANGE) {
283 			usage->hid = HID_DG_BARRELSWITCH2;
284 		}
285 	}
286 
287 	switch (usage->hid) {
288 	case HID_GD_X:
289 		features->x_max = field->logical_maximum;
290 		if (finger) {
291 			features->x_phy = field->physical_maximum;
292 			if ((features->type != BAMBOO_PT) &&
293 			    (features->type != BAMBOO_TOUCH)) {
294 				features->unit = field->unit;
295 				features->unitExpo = field->unit_exponent;
296 			}
297 		}
298 		break;
299 	case HID_GD_Y:
300 		features->y_max = field->logical_maximum;
301 		if (finger) {
302 			features->y_phy = field->physical_maximum;
303 			if ((features->type != BAMBOO_PT) &&
304 			    (features->type != BAMBOO_TOUCH)) {
305 				features->unit = field->unit;
306 				features->unitExpo = field->unit_exponent;
307 			}
308 		}
309 		break;
310 	case HID_DG_TIPPRESSURE:
311 		if (pen)
312 			features->pressure_max = field->logical_maximum;
313 		break;
314 	}
315 
316 	if (features->type == HID_GENERIC)
317 		wacom_wac_usage_mapping(hdev, field, usage);
318 }
319 
320 static void wacom_post_parse_hid(struct hid_device *hdev,
321 				 struct wacom_features *features)
322 {
323 	struct wacom *wacom = hid_get_drvdata(hdev);
324 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
325 
326 	if (features->type == HID_GENERIC) {
327 		/* Any last-minute generic device setup */
328 		if (wacom_wac->has_mode_change) {
329 			if (wacom_wac->is_direct_mode)
330 				features->device_type |= WACOM_DEVICETYPE_DIRECT;
331 			else
332 				features->device_type &= ~WACOM_DEVICETYPE_DIRECT;
333 		}
334 
335 		if (features->touch_max > 1) {
336 			if (features->device_type & WACOM_DEVICETYPE_DIRECT)
337 				input_mt_init_slots(wacom_wac->touch_input,
338 						    wacom_wac->features.touch_max,
339 						    INPUT_MT_DIRECT);
340 			else
341 				input_mt_init_slots(wacom_wac->touch_input,
342 						    wacom_wac->features.touch_max,
343 						    INPUT_MT_POINTER);
344 		}
345 	}
346 }
347 
348 static void wacom_parse_hid(struct hid_device *hdev,
349 			   struct wacom_features *features)
350 {
351 	struct hid_report_enum *rep_enum;
352 	struct hid_report *hreport;
353 	int i, j;
354 
355 	/* check features first */
356 	rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
357 	list_for_each_entry(hreport, &rep_enum->report_list, list) {
358 		for (i = 0; i < hreport->maxfield; i++) {
359 			/* Ignore if report count is out of bounds. */
360 			if (hreport->field[i]->report_count < 1)
361 				continue;
362 
363 			for (j = 0; j < hreport->field[i]->maxusage; j++) {
364 				wacom_feature_mapping(hdev, hreport->field[i],
365 						hreport->field[i]->usage + j);
366 			}
367 		}
368 	}
369 
370 	/* now check the input usages */
371 	rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
372 	list_for_each_entry(hreport, &rep_enum->report_list, list) {
373 
374 		if (!hreport->maxfield)
375 			continue;
376 
377 		for (i = 0; i < hreport->maxfield; i++)
378 			for (j = 0; j < hreport->field[i]->maxusage; j++)
379 				wacom_usage_mapping(hdev, hreport->field[i],
380 						hreport->field[i]->usage + j);
381 	}
382 
383 	wacom_post_parse_hid(hdev, features);
384 }
385 
386 static int wacom_hid_set_device_mode(struct hid_device *hdev)
387 {
388 	struct wacom *wacom = hid_get_drvdata(hdev);
389 	struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
390 	struct hid_report *r;
391 	struct hid_report_enum *re;
392 
393 	if (hid_data->inputmode < 0)
394 		return 0;
395 
396 	re = &(hdev->report_enum[HID_FEATURE_REPORT]);
397 	r = re->report_id_hash[hid_data->inputmode];
398 	if (r) {
399 		r->field[0]->value[hid_data->inputmode_index] = 2;
400 		hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
401 	}
402 	return 0;
403 }
404 
405 static int wacom_set_device_mode(struct hid_device *hdev,
406 				 struct wacom_wac *wacom_wac)
407 {
408 	u8 *rep_data;
409 	struct hid_report *r;
410 	struct hid_report_enum *re;
411 	int length;
412 	int error = -ENOMEM, limit = 0;
413 
414 	if (wacom_wac->mode_report < 0)
415 		return 0;
416 
417 	re = &(hdev->report_enum[HID_FEATURE_REPORT]);
418 	r = re->report_id_hash[wacom_wac->mode_report];
419 	if (!r)
420 		return -EINVAL;
421 
422 	rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
423 	if (!rep_data)
424 		return -ENOMEM;
425 
426 	length = hid_report_len(r);
427 
428 	do {
429 		rep_data[0] = wacom_wac->mode_report;
430 		rep_data[1] = wacom_wac->mode_value;
431 
432 		error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
433 					 length, 1);
434 		if (error >= 0)
435 			error = wacom_get_report(hdev, HID_FEATURE_REPORT,
436 			                         rep_data, length, 1);
437 	} while (error >= 0 &&
438 		 rep_data[1] != wacom_wac->mode_report &&
439 		 limit++ < WAC_MSG_RETRIES);
440 
441 	kfree(rep_data);
442 
443 	return error < 0 ? error : 0;
444 }
445 
446 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
447 		struct wacom_features *features)
448 {
449 	struct wacom *wacom = hid_get_drvdata(hdev);
450 	int ret;
451 	u8 rep_data[2];
452 
453 	switch (features->type) {
454 	case GRAPHIRE_BT:
455 		rep_data[0] = 0x03;
456 		rep_data[1] = 0x00;
457 		ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
458 					3);
459 
460 		if (ret >= 0) {
461 			rep_data[0] = speed == 0 ? 0x05 : 0x06;
462 			rep_data[1] = 0x00;
463 
464 			ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
465 						rep_data, 2, 3);
466 
467 			if (ret >= 0) {
468 				wacom->wacom_wac.bt_high_speed = speed;
469 				return 0;
470 			}
471 		}
472 
473 		/*
474 		 * Note that if the raw queries fail, it's not a hard failure
475 		 * and it is safe to continue
476 		 */
477 		hid_warn(hdev, "failed to poke device, command %d, err %d\n",
478 			 rep_data[0], ret);
479 		break;
480 	case INTUOS4WL:
481 		if (speed == 1)
482 			wacom->wacom_wac.bt_features &= ~0x20;
483 		else
484 			wacom->wacom_wac.bt_features |= 0x20;
485 
486 		rep_data[0] = 0x03;
487 		rep_data[1] = wacom->wacom_wac.bt_features;
488 
489 		ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
490 					1);
491 		if (ret >= 0)
492 			wacom->wacom_wac.bt_high_speed = speed;
493 		break;
494 	}
495 
496 	return 0;
497 }
498 
499 /*
500  * Switch the tablet into its most-capable mode. Wacom tablets are
501  * typically configured to power-up in a mode which sends mouse-like
502  * reports to the OS. To get absolute position, pressure data, etc.
503  * from the tablet, it is necessary to switch the tablet out of this
504  * mode and into one which sends the full range of tablet data.
505  */
506 static int _wacom_query_tablet_data(struct wacom *wacom)
507 {
508 	struct hid_device *hdev = wacom->hdev;
509 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
510 	struct wacom_features *features = &wacom_wac->features;
511 
512 	if (hdev->bus == BUS_BLUETOOTH)
513 		return wacom_bt_query_tablet_data(hdev, 1, features);
514 
515 	if (features->type != HID_GENERIC) {
516 		if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
517 			if (features->type > TABLETPC) {
518 				/* MT Tablet PC touch */
519 				wacom_wac->mode_report = 3;
520 				wacom_wac->mode_value = 4;
521 			} else if (features->type == WACOM_24HDT) {
522 				wacom_wac->mode_report = 18;
523 				wacom_wac->mode_value = 2;
524 			} else if (features->type == WACOM_27QHDT) {
525 				wacom_wac->mode_report = 131;
526 				wacom_wac->mode_value = 2;
527 			} else if (features->type == BAMBOO_PAD) {
528 				wacom_wac->mode_report = 2;
529 				wacom_wac->mode_value = 2;
530 			}
531 		} else if (features->device_type & WACOM_DEVICETYPE_PEN) {
532 			if (features->type <= BAMBOO_PT) {
533 				wacom_wac->mode_report = 2;
534 				wacom_wac->mode_value = 2;
535 			}
536 		}
537 	}
538 
539 	wacom_set_device_mode(hdev, wacom_wac);
540 
541 	if (features->type == HID_GENERIC)
542 		return wacom_hid_set_device_mode(hdev);
543 
544 	return 0;
545 }
546 
547 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
548 					 struct wacom_features *features)
549 {
550 	struct wacom *wacom = hid_get_drvdata(hdev);
551 	struct usb_interface *intf = wacom->intf;
552 
553 	/* default features */
554 	features->x_fuzz = 4;
555 	features->y_fuzz = 4;
556 	features->pressure_fuzz = 0;
557 	features->distance_fuzz = 1;
558 	features->tilt_fuzz = 1;
559 
560 	/*
561 	 * The wireless device HID is basic and layout conflicts with
562 	 * other tablets (monitor and touch interface can look like pen).
563 	 * Skip the query for this type and modify defaults based on
564 	 * interface number.
565 	 */
566 	if (features->type == WIRELESS) {
567 		if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
568 			features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
569 		else
570 			features->device_type = WACOM_DEVICETYPE_NONE;
571 		return;
572 	}
573 
574 	wacom_parse_hid(hdev, features);
575 }
576 
577 struct wacom_hdev_data {
578 	struct list_head list;
579 	struct kref kref;
580 	struct hid_device *dev;
581 	struct wacom_shared shared;
582 };
583 
584 static LIST_HEAD(wacom_udev_list);
585 static DEFINE_MUTEX(wacom_udev_list_lock);
586 
587 static bool compare_device_paths(struct hid_device *hdev_a,
588 		struct hid_device *hdev_b, char separator)
589 {
590 	int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
591 	int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
592 
593 	if (n1 != n2 || n1 <= 0 || n2 <= 0)
594 		return false;
595 
596 	return !strncmp(hdev_a->phys, hdev_b->phys, n1);
597 }
598 
599 static bool wacom_are_sibling(struct hid_device *hdev,
600 		struct hid_device *sibling)
601 {
602 	struct wacom *wacom = hid_get_drvdata(hdev);
603 	struct wacom_features *features = &wacom->wacom_wac.features;
604 	struct wacom *sibling_wacom = hid_get_drvdata(sibling);
605 	struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
606 	__u32 oVid = features->oVid ? features->oVid : hdev->vendor;
607 	__u32 oPid = features->oPid ? features->oPid : hdev->product;
608 
609 	/* The defined oVid/oPid must match that of the sibling */
610 	if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
611 		return false;
612 	if (features->oPid != HID_ANY_ID && sibling->product != oPid)
613 		return false;
614 
615 	/*
616 	 * Devices with the same VID/PID must share the same physical
617 	 * device path, while those with different VID/PID must share
618 	 * the same physical parent device path.
619 	 */
620 	if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
621 		if (!compare_device_paths(hdev, sibling, '/'))
622 			return false;
623 	} else {
624 		if (!compare_device_paths(hdev, sibling, '.'))
625 			return false;
626 	}
627 
628 	/* Skip the remaining heuristics unless you are a HID_GENERIC device */
629 	if (features->type != HID_GENERIC)
630 		return true;
631 
632 	/*
633 	 * Direct-input devices may not be siblings of indirect-input
634 	 * devices.
635 	 */
636 	if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
637 	    !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
638 		return false;
639 
640 	/*
641 	 * Indirect-input devices may not be siblings of direct-input
642 	 * devices.
643 	 */
644 	if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
645 	    (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
646 		return false;
647 
648 	/* Pen devices may only be siblings of touch devices */
649 	if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
650 	    !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
651 		return false;
652 
653 	/* Touch devices may only be siblings of pen devices */
654 	if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
655 	    !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
656 		return false;
657 
658 	/*
659 	 * No reason could be found for these two devices to NOT be
660 	 * siblings, so there's a good chance they ARE siblings
661 	 */
662 	return true;
663 }
664 
665 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
666 {
667 	struct wacom_hdev_data *data;
668 
669 	/* Try to find an already-probed interface from the same device */
670 	list_for_each_entry(data, &wacom_udev_list, list) {
671 		if (compare_device_paths(hdev, data->dev, '/'))
672 			return data;
673 	}
674 
675 	/* Fallback to finding devices that appear to be "siblings" */
676 	list_for_each_entry(data, &wacom_udev_list, list) {
677 		if (wacom_are_sibling(hdev, data->dev)) {
678 			kref_get(&data->kref);
679 			return data;
680 		}
681 	}
682 
683 	return NULL;
684 }
685 
686 static void wacom_release_shared_data(struct kref *kref)
687 {
688 	struct wacom_hdev_data *data =
689 		container_of(kref, struct wacom_hdev_data, kref);
690 
691 	mutex_lock(&wacom_udev_list_lock);
692 	list_del(&data->list);
693 	mutex_unlock(&wacom_udev_list_lock);
694 
695 	kfree(data);
696 }
697 
698 static void wacom_remove_shared_data(void *res)
699 {
700 	struct wacom *wacom = res;
701 	struct wacom_hdev_data *data;
702 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
703 
704 	if (wacom_wac->shared) {
705 		data = container_of(wacom_wac->shared, struct wacom_hdev_data,
706 				    shared);
707 
708 		if (wacom_wac->shared->touch == wacom->hdev)
709 			wacom_wac->shared->touch = NULL;
710 		else if (wacom_wac->shared->pen == wacom->hdev)
711 			wacom_wac->shared->pen = NULL;
712 
713 		kref_put(&data->kref, wacom_release_shared_data);
714 		wacom_wac->shared = NULL;
715 	}
716 }
717 
718 static int wacom_add_shared_data(struct hid_device *hdev)
719 {
720 	struct wacom *wacom = hid_get_drvdata(hdev);
721 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
722 	struct wacom_hdev_data *data;
723 	int retval = 0;
724 
725 	mutex_lock(&wacom_udev_list_lock);
726 
727 	data = wacom_get_hdev_data(hdev);
728 	if (!data) {
729 		data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
730 		if (!data) {
731 			retval = -ENOMEM;
732 			goto out;
733 		}
734 
735 		kref_init(&data->kref);
736 		data->dev = hdev;
737 		list_add_tail(&data->list, &wacom_udev_list);
738 	}
739 
740 	wacom_wac->shared = &data->shared;
741 
742 	retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
743 	if (retval) {
744 		mutex_unlock(&wacom_udev_list_lock);
745 		wacom_remove_shared_data(wacom);
746 		return retval;
747 	}
748 
749 	if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
750 		wacom_wac->shared->touch = hdev;
751 	else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
752 		wacom_wac->shared->pen = hdev;
753 
754 out:
755 	mutex_unlock(&wacom_udev_list_lock);
756 	return retval;
757 }
758 
759 static int wacom_led_control(struct wacom *wacom)
760 {
761 	unsigned char *buf;
762 	int retval;
763 	unsigned char report_id = WAC_CMD_LED_CONTROL;
764 	int buf_size = 9;
765 
766 	if (!wacom->led.groups)
767 		return -ENOTSUPP;
768 
769 	if (wacom->wacom_wac.pid) { /* wireless connected */
770 		report_id = WAC_CMD_WL_LED_CONTROL;
771 		buf_size = 13;
772 	}
773 	else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
774 		report_id = WAC_CMD_WL_INTUOSP2;
775 		buf_size = 51;
776 	}
777 	buf = kzalloc(buf_size, GFP_KERNEL);
778 	if (!buf)
779 		return -ENOMEM;
780 
781 	if (wacom->wacom_wac.features.type == HID_GENERIC) {
782 		buf[0] = WAC_CMD_LED_CONTROL_GENERIC;
783 		buf[1] = wacom->led.llv;
784 		buf[2] = wacom->led.groups[0].select & 0x03;
785 
786 	} else if ((wacom->wacom_wac.features.type >= INTUOS5S &&
787 	    wacom->wacom_wac.features.type <= INTUOSPL)) {
788 		/*
789 		 * Touch Ring and crop mark LED luminance may take on
790 		 * one of four values:
791 		 *    0 = Low; 1 = Medium; 2 = High; 3 = Off
792 		 */
793 		int ring_led = wacom->led.groups[0].select & 0x03;
794 		int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
795 		int crop_lum = 0;
796 		unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
797 
798 		buf[0] = report_id;
799 		if (wacom->wacom_wac.pid) {
800 			wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
801 					 buf, buf_size, WAC_CMD_RETRIES);
802 			buf[0] = report_id;
803 			buf[4] = led_bits;
804 		} else
805 			buf[1] = led_bits;
806 	}
807 	else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
808 		buf[0] = report_id;
809 		buf[4] = 100; // Power Connection LED (ORANGE)
810 		buf[5] = 100; // BT Connection LED (BLUE)
811 		buf[6] = 100; // Paper Mode (RED?)
812 		buf[7] = 100; // Paper Mode (GREEN?)
813 		buf[8] = 100; // Paper Mode (BLUE?)
814 		buf[9] = wacom->led.llv;
815 		buf[10] = wacom->led.groups[0].select & 0x03;
816 	}
817 	else {
818 		int led = wacom->led.groups[0].select | 0x4;
819 
820 		if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
821 		    wacom->wacom_wac.features.type == WACOM_24HD)
822 			led |= (wacom->led.groups[1].select << 4) | 0x40;
823 
824 		buf[0] = report_id;
825 		buf[1] = led;
826 		buf[2] = wacom->led.llv;
827 		buf[3] = wacom->led.hlv;
828 		buf[4] = wacom->led.img_lum;
829 	}
830 
831 	retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
832 				  WAC_CMD_RETRIES);
833 	kfree(buf);
834 
835 	return retval;
836 }
837 
838 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
839 		const unsigned len, const void *img)
840 {
841 	unsigned char *buf;
842 	int i, retval;
843 	const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
844 
845 	buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
846 	if (!buf)
847 		return -ENOMEM;
848 
849 	/* Send 'start' command */
850 	buf[0] = WAC_CMD_ICON_START;
851 	buf[1] = 1;
852 	retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
853 				  WAC_CMD_RETRIES);
854 	if (retval < 0)
855 		goto out;
856 
857 	buf[0] = xfer_id;
858 	buf[1] = button_id & 0x07;
859 	for (i = 0; i < 4; i++) {
860 		buf[2] = i;
861 		memcpy(buf + 3, img + i * chunk_len, chunk_len);
862 
863 		retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
864 					  buf, chunk_len + 3, WAC_CMD_RETRIES);
865 		if (retval < 0)
866 			break;
867 	}
868 
869 	/* Send 'stop' */
870 	buf[0] = WAC_CMD_ICON_START;
871 	buf[1] = 0;
872 	wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
873 			 WAC_CMD_RETRIES);
874 
875 out:
876 	kfree(buf);
877 	return retval;
878 }
879 
880 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
881 				      const char *buf, size_t count)
882 {
883 	struct hid_device *hdev = to_hid_device(dev);
884 	struct wacom *wacom = hid_get_drvdata(hdev);
885 	unsigned int id;
886 	int err;
887 
888 	err = kstrtouint(buf, 10, &id);
889 	if (err)
890 		return err;
891 
892 	mutex_lock(&wacom->lock);
893 
894 	wacom->led.groups[set_id].select = id & 0x3;
895 	err = wacom_led_control(wacom);
896 
897 	mutex_unlock(&wacom->lock);
898 
899 	return err < 0 ? err : count;
900 }
901 
902 #define DEVICE_LED_SELECT_ATTR(SET_ID)					\
903 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,	\
904 	struct device_attribute *attr, const char *buf, size_t count)	\
905 {									\
906 	return wacom_led_select_store(dev, SET_ID, buf, count);		\
907 }									\
908 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,	\
909 	struct device_attribute *attr, char *buf)			\
910 {									\
911 	struct hid_device *hdev = to_hid_device(dev);\
912 	struct wacom *wacom = hid_get_drvdata(hdev);			\
913 	return scnprintf(buf, PAGE_SIZE, "%d\n",			\
914 			 wacom->led.groups[SET_ID].select);		\
915 }									\
916 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,	\
917 		    wacom_led##SET_ID##_select_show,			\
918 		    wacom_led##SET_ID##_select_store)
919 
920 DEVICE_LED_SELECT_ATTR(0);
921 DEVICE_LED_SELECT_ATTR(1);
922 
923 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
924 				     const char *buf, size_t count)
925 {
926 	unsigned int value;
927 	int err;
928 
929 	err = kstrtouint(buf, 10, &value);
930 	if (err)
931 		return err;
932 
933 	mutex_lock(&wacom->lock);
934 
935 	*dest = value & 0x7f;
936 	err = wacom_led_control(wacom);
937 
938 	mutex_unlock(&wacom->lock);
939 
940 	return err < 0 ? err : count;
941 }
942 
943 #define DEVICE_LUMINANCE_ATTR(name, field)				\
944 static ssize_t wacom_##name##_luminance_store(struct device *dev,	\
945 	struct device_attribute *attr, const char *buf, size_t count)	\
946 {									\
947 	struct hid_device *hdev = to_hid_device(dev);\
948 	struct wacom *wacom = hid_get_drvdata(hdev);			\
949 									\
950 	return wacom_luminance_store(wacom, &wacom->led.field,		\
951 				     buf, count);			\
952 }									\
953 static ssize_t wacom_##name##_luminance_show(struct device *dev,	\
954 	struct device_attribute *attr, char *buf)			\
955 {									\
956 	struct wacom *wacom = dev_get_drvdata(dev);			\
957 	return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);	\
958 }									\
959 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,			\
960 		   wacom_##name##_luminance_show,			\
961 		   wacom_##name##_luminance_store)
962 
963 DEVICE_LUMINANCE_ATTR(status0, llv);
964 DEVICE_LUMINANCE_ATTR(status1, hlv);
965 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
966 
967 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
968 					const char *buf, size_t count)
969 {
970 	struct hid_device *hdev = to_hid_device(dev);
971 	struct wacom *wacom = hid_get_drvdata(hdev);
972 	int err;
973 	unsigned len;
974 	u8 xfer_id;
975 
976 	if (hdev->bus == BUS_BLUETOOTH) {
977 		len = 256;
978 		xfer_id = WAC_CMD_ICON_BT_XFER;
979 	} else {
980 		len = 1024;
981 		xfer_id = WAC_CMD_ICON_XFER;
982 	}
983 
984 	if (count != len)
985 		return -EINVAL;
986 
987 	mutex_lock(&wacom->lock);
988 
989 	err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
990 
991 	mutex_unlock(&wacom->lock);
992 
993 	return err < 0 ? err : count;
994 }
995 
996 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)					\
997 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,	\
998 	struct device_attribute *attr, const char *buf, size_t count)	\
999 {									\
1000 	return wacom_button_image_store(dev, BUTTON_ID, buf, count);	\
1001 }									\
1002 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,	\
1003 		   NULL, wacom_btnimg##BUTTON_ID##_store)
1004 
1005 DEVICE_BTNIMG_ATTR(0);
1006 DEVICE_BTNIMG_ATTR(1);
1007 DEVICE_BTNIMG_ATTR(2);
1008 DEVICE_BTNIMG_ATTR(3);
1009 DEVICE_BTNIMG_ATTR(4);
1010 DEVICE_BTNIMG_ATTR(5);
1011 DEVICE_BTNIMG_ATTR(6);
1012 DEVICE_BTNIMG_ATTR(7);
1013 
1014 static struct attribute *cintiq_led_attrs[] = {
1015 	&dev_attr_status_led0_select.attr,
1016 	&dev_attr_status_led1_select.attr,
1017 	NULL
1018 };
1019 
1020 static struct attribute_group cintiq_led_attr_group = {
1021 	.name = "wacom_led",
1022 	.attrs = cintiq_led_attrs,
1023 };
1024 
1025 static struct attribute *intuos4_led_attrs[] = {
1026 	&dev_attr_status0_luminance.attr,
1027 	&dev_attr_status1_luminance.attr,
1028 	&dev_attr_status_led0_select.attr,
1029 	&dev_attr_buttons_luminance.attr,
1030 	&dev_attr_button0_rawimg.attr,
1031 	&dev_attr_button1_rawimg.attr,
1032 	&dev_attr_button2_rawimg.attr,
1033 	&dev_attr_button3_rawimg.attr,
1034 	&dev_attr_button4_rawimg.attr,
1035 	&dev_attr_button5_rawimg.attr,
1036 	&dev_attr_button6_rawimg.attr,
1037 	&dev_attr_button7_rawimg.attr,
1038 	NULL
1039 };
1040 
1041 static struct attribute_group intuos4_led_attr_group = {
1042 	.name = "wacom_led",
1043 	.attrs = intuos4_led_attrs,
1044 };
1045 
1046 static struct attribute *intuos5_led_attrs[] = {
1047 	&dev_attr_status0_luminance.attr,
1048 	&dev_attr_status_led0_select.attr,
1049 	NULL
1050 };
1051 
1052 static struct attribute_group intuos5_led_attr_group = {
1053 	.name = "wacom_led",
1054 	.attrs = intuos5_led_attrs,
1055 };
1056 
1057 static struct attribute *generic_led_attrs[] = {
1058 	&dev_attr_status0_luminance.attr,
1059 	&dev_attr_status_led0_select.attr,
1060 	NULL
1061 };
1062 
1063 static struct attribute_group generic_led_attr_group = {
1064 	.name = "wacom_led",
1065 	.attrs = generic_led_attrs,
1066 };
1067 
1068 struct wacom_sysfs_group_devres {
1069 	struct attribute_group *group;
1070 	struct kobject *root;
1071 };
1072 
1073 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
1074 {
1075 	struct wacom_sysfs_group_devres *devres = res;
1076 	struct kobject *kobj = devres->root;
1077 
1078 	dev_dbg(dev, "%s: dropping reference to %s\n",
1079 		__func__, devres->group->name);
1080 	sysfs_remove_group(kobj, devres->group);
1081 }
1082 
1083 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
1084 					   struct kobject *root,
1085 					   struct attribute_group *group)
1086 {
1087 	struct wacom_sysfs_group_devres *devres;
1088 	int error;
1089 
1090 	devres = devres_alloc(wacom_devm_sysfs_group_release,
1091 			      sizeof(struct wacom_sysfs_group_devres),
1092 			      GFP_KERNEL);
1093 	if (!devres)
1094 		return -ENOMEM;
1095 
1096 	devres->group = group;
1097 	devres->root = root;
1098 
1099 	error = sysfs_create_group(devres->root, group);
1100 	if (error)
1101 		return error;
1102 
1103 	devres_add(&wacom->hdev->dev, devres);
1104 
1105 	return 0;
1106 }
1107 
1108 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
1109 					 struct attribute_group *group)
1110 {
1111 	return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
1112 					       group);
1113 }
1114 
1115 enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
1116 {
1117 	struct wacom *wacom = led->wacom;
1118 
1119 	if (wacom->led.max_hlv)
1120 		return led->hlv * LED_FULL / wacom->led.max_hlv;
1121 
1122 	if (wacom->led.max_llv)
1123 		return led->llv * LED_FULL / wacom->led.max_llv;
1124 
1125 	/* device doesn't support brightness tuning */
1126 	return LED_FULL;
1127 }
1128 
1129 static enum led_brightness __wacom_led_brightness_get(struct led_classdev *cdev)
1130 {
1131 	struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1132 	struct wacom *wacom = led->wacom;
1133 
1134 	if (wacom->led.groups[led->group].select != led->id)
1135 		return LED_OFF;
1136 
1137 	return wacom_leds_brightness_get(led);
1138 }
1139 
1140 static int wacom_led_brightness_set(struct led_classdev *cdev,
1141 				    enum led_brightness brightness)
1142 {
1143 	struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1144 	struct wacom *wacom = led->wacom;
1145 	int error;
1146 
1147 	mutex_lock(&wacom->lock);
1148 
1149 	if (!wacom->led.groups || (brightness == LED_OFF &&
1150 	    wacom->led.groups[led->group].select != led->id)) {
1151 		error = 0;
1152 		goto out;
1153 	}
1154 
1155 	led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
1156 	led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
1157 
1158 	wacom->led.groups[led->group].select = led->id;
1159 
1160 	error = wacom_led_control(wacom);
1161 
1162 out:
1163 	mutex_unlock(&wacom->lock);
1164 
1165 	return error;
1166 }
1167 
1168 static void wacom_led_readonly_brightness_set(struct led_classdev *cdev,
1169 					       enum led_brightness brightness)
1170 {
1171 }
1172 
1173 static int wacom_led_register_one(struct device *dev, struct wacom *wacom,
1174 				  struct wacom_led *led, unsigned int group,
1175 				  unsigned int id, bool read_only)
1176 {
1177 	int error;
1178 	char *name;
1179 
1180 	name = devm_kasprintf(dev, GFP_KERNEL,
1181 			      "%s::wacom-%d.%d",
1182 			      dev_name(dev),
1183 			      group,
1184 			      id);
1185 	if (!name)
1186 		return -ENOMEM;
1187 
1188 	if (!read_only) {
1189 		led->trigger.name = name;
1190 		error = devm_led_trigger_register(dev, &led->trigger);
1191 		if (error) {
1192 			hid_err(wacom->hdev,
1193 				"failed to register LED trigger %s: %d\n",
1194 				led->cdev.name, error);
1195 			return error;
1196 		}
1197 	}
1198 
1199 	led->group = group;
1200 	led->id = id;
1201 	led->wacom = wacom;
1202 	led->llv = wacom->led.llv;
1203 	led->hlv = wacom->led.hlv;
1204 	led->cdev.name = name;
1205 	led->cdev.max_brightness = LED_FULL;
1206 	led->cdev.flags = LED_HW_PLUGGABLE;
1207 	led->cdev.brightness_get = __wacom_led_brightness_get;
1208 	if (!read_only) {
1209 		led->cdev.brightness_set_blocking = wacom_led_brightness_set;
1210 		led->cdev.default_trigger = led->cdev.name;
1211 	} else {
1212 		led->cdev.brightness_set = wacom_led_readonly_brightness_set;
1213 	}
1214 
1215 	error = devm_led_classdev_register(dev, &led->cdev);
1216 	if (error) {
1217 		hid_err(wacom->hdev,
1218 			"failed to register LED %s: %d\n",
1219 			led->cdev.name, error);
1220 		led->cdev.name = NULL;
1221 		return error;
1222 	}
1223 
1224 	return 0;
1225 }
1226 
1227 static void wacom_led_groups_release_one(void *data)
1228 {
1229 	struct wacom_group_leds *group = data;
1230 
1231 	devres_release_group(group->dev, group);
1232 }
1233 
1234 static int wacom_led_groups_alloc_and_register_one(struct device *dev,
1235 						   struct wacom *wacom,
1236 						   int group_id, int count,
1237 						   bool read_only)
1238 {
1239 	struct wacom_led *leds;
1240 	int i, error;
1241 
1242 	if (group_id >= wacom->led.count || count <= 0)
1243 		return -EINVAL;
1244 
1245 	if (!devres_open_group(dev, &wacom->led.groups[group_id], GFP_KERNEL))
1246 		return -ENOMEM;
1247 
1248 	leds = devm_kzalloc(dev, sizeof(struct wacom_led) * count, GFP_KERNEL);
1249 	if (!leds) {
1250 		error = -ENOMEM;
1251 		goto err;
1252 	}
1253 
1254 	wacom->led.groups[group_id].leds = leds;
1255 	wacom->led.groups[group_id].count = count;
1256 
1257 	for (i = 0; i < count; i++) {
1258 		error = wacom_led_register_one(dev, wacom, &leds[i],
1259 					       group_id, i, read_only);
1260 		if (error)
1261 			goto err;
1262 	}
1263 
1264 	wacom->led.groups[group_id].dev = dev;
1265 
1266 	devres_close_group(dev, &wacom->led.groups[group_id]);
1267 
1268 	/*
1269 	 * There is a bug (?) in devm_led_classdev_register() in which its
1270 	 * increments the refcount of the parent. If the parent is an input
1271 	 * device, that means the ref count never reaches 0 when
1272 	 * devm_input_device_release() gets called.
1273 	 * This means that the LEDs are still there after disconnect.
1274 	 * Manually force the release of the group so that the leds are released
1275 	 * once we are done using them.
1276 	 */
1277 	error = devm_add_action_or_reset(&wacom->hdev->dev,
1278 					 wacom_led_groups_release_one,
1279 					 &wacom->led.groups[group_id]);
1280 	if (error)
1281 		return error;
1282 
1283 	return 0;
1284 
1285 err:
1286 	devres_release_group(dev, &wacom->led.groups[group_id]);
1287 	return error;
1288 }
1289 
1290 struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group_id,
1291 				 unsigned int id)
1292 {
1293 	struct wacom_group_leds *group;
1294 
1295 	if (group_id >= wacom->led.count)
1296 		return NULL;
1297 
1298 	group = &wacom->led.groups[group_id];
1299 
1300 	if (!group->leds)
1301 		return NULL;
1302 
1303 	id %= group->count;
1304 
1305 	return &group->leds[id];
1306 }
1307 
1308 /**
1309  * wacom_led_next: gives the next available led with a wacom trigger.
1310  *
1311  * returns the next available struct wacom_led which has its default trigger
1312  * or the current one if none is available.
1313  */
1314 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur)
1315 {
1316 	struct wacom_led *next_led;
1317 	int group, next;
1318 
1319 	if (!wacom || !cur)
1320 		return NULL;
1321 
1322 	group = cur->group;
1323 	next = cur->id;
1324 
1325 	do {
1326 		next_led = wacom_led_find(wacom, group, ++next);
1327 		if (!next_led || next_led == cur)
1328 			return next_led;
1329 	} while (next_led->cdev.trigger != &next_led->trigger);
1330 
1331 	return next_led;
1332 }
1333 
1334 static void wacom_led_groups_release(void *data)
1335 {
1336 	struct wacom *wacom = data;
1337 
1338 	wacom->led.groups = NULL;
1339 	wacom->led.count = 0;
1340 }
1341 
1342 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
1343 {
1344 	struct device *dev = &wacom->hdev->dev;
1345 	struct wacom_group_leds *groups;
1346 	int error;
1347 
1348 	groups = devm_kzalloc(dev, sizeof(struct wacom_group_leds) * count,
1349 			      GFP_KERNEL);
1350 	if (!groups)
1351 		return -ENOMEM;
1352 
1353 	error = devm_add_action_or_reset(dev, wacom_led_groups_release, wacom);
1354 	if (error)
1355 		return error;
1356 
1357 	wacom->led.groups = groups;
1358 	wacom->led.count = count;
1359 
1360 	return 0;
1361 }
1362 
1363 static int wacom_leds_alloc_and_register(struct wacom *wacom, int group_count,
1364 					 int led_per_group, bool read_only)
1365 {
1366 	struct device *dev;
1367 	int i, error;
1368 
1369 	if (!wacom->wacom_wac.pad_input)
1370 		return -EINVAL;
1371 
1372 	dev = &wacom->wacom_wac.pad_input->dev;
1373 
1374 	error = wacom_led_groups_allocate(wacom, group_count);
1375 	if (error)
1376 		return error;
1377 
1378 	for (i = 0; i < group_count; i++) {
1379 		error = wacom_led_groups_alloc_and_register_one(dev, wacom, i,
1380 								led_per_group,
1381 								read_only);
1382 		if (error)
1383 			return error;
1384 	}
1385 
1386 	return 0;
1387 }
1388 
1389 int wacom_initialize_leds(struct wacom *wacom)
1390 {
1391 	int error;
1392 
1393 	if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1394 		return 0;
1395 
1396 	/* Initialize default values */
1397 	switch (wacom->wacom_wac.features.type) {
1398 	case HID_GENERIC:
1399 		if (!wacom->generic_has_leds)
1400 			return 0;
1401 		wacom->led.llv = 100;
1402 		wacom->led.max_llv = 100;
1403 
1404 		error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1405 		if (error) {
1406 			hid_err(wacom->hdev,
1407 				"cannot create leds err: %d\n", error);
1408 			return error;
1409 		}
1410 
1411 		error = wacom_devm_sysfs_create_group(wacom,
1412 						      &generic_led_attr_group);
1413 		break;
1414 
1415 	case INTUOS4S:
1416 	case INTUOS4:
1417 	case INTUOS4WL:
1418 	case INTUOS4L:
1419 		wacom->led.llv = 10;
1420 		wacom->led.hlv = 20;
1421 		wacom->led.max_llv = 127;
1422 		wacom->led.max_hlv = 127;
1423 		wacom->led.img_lum = 10;
1424 
1425 		error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1426 		if (error) {
1427 			hid_err(wacom->hdev,
1428 				"cannot create leds err: %d\n", error);
1429 			return error;
1430 		}
1431 
1432 		error = wacom_devm_sysfs_create_group(wacom,
1433 						      &intuos4_led_attr_group);
1434 		break;
1435 
1436 	case WACOM_24HD:
1437 	case WACOM_21UX2:
1438 		wacom->led.llv = 0;
1439 		wacom->led.hlv = 0;
1440 		wacom->led.img_lum = 0;
1441 
1442 		error = wacom_leds_alloc_and_register(wacom, 2, 4, false);
1443 		if (error) {
1444 			hid_err(wacom->hdev,
1445 				"cannot create leds err: %d\n", error);
1446 			return error;
1447 		}
1448 
1449 		error = wacom_devm_sysfs_create_group(wacom,
1450 						      &cintiq_led_attr_group);
1451 		break;
1452 
1453 	case INTUOS5S:
1454 	case INTUOS5:
1455 	case INTUOS5L:
1456 	case INTUOSPS:
1457 	case INTUOSPM:
1458 	case INTUOSPL:
1459 		wacom->led.llv = 32;
1460 		wacom->led.max_llv = 96;
1461 
1462 		error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1463 		if (error) {
1464 			hid_err(wacom->hdev,
1465 				"cannot create leds err: %d\n", error);
1466 			return error;
1467 		}
1468 
1469 		error = wacom_devm_sysfs_create_group(wacom,
1470 						      &intuos5_led_attr_group);
1471 		break;
1472 
1473 	case INTUOSP2_BT:
1474 		wacom->led.llv = 50;
1475 		wacom->led.max_llv = 100;
1476 		error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1477 		if (error) {
1478 			hid_err(wacom->hdev,
1479 				"cannot create leds err: %d\n", error);
1480 			return error;
1481 		}
1482 		return 0;
1483 
1484 	case REMOTE:
1485 		wacom->led.llv = 255;
1486 		wacom->led.max_llv = 255;
1487 		error = wacom_led_groups_allocate(wacom, 5);
1488 		if (error) {
1489 			hid_err(wacom->hdev,
1490 				"cannot create leds err: %d\n", error);
1491 			return error;
1492 		}
1493 		return 0;
1494 
1495 	default:
1496 		return 0;
1497 	}
1498 
1499 	if (error) {
1500 		hid_err(wacom->hdev,
1501 			"cannot create sysfs group err: %d\n", error);
1502 		return error;
1503 	}
1504 
1505 	return 0;
1506 }
1507 
1508 static void wacom_init_work(struct work_struct *work)
1509 {
1510 	struct wacom *wacom = container_of(work, struct wacom, init_work.work);
1511 
1512 	_wacom_query_tablet_data(wacom);
1513 	wacom_led_control(wacom);
1514 }
1515 
1516 static void wacom_query_tablet_data(struct wacom *wacom)
1517 {
1518 	schedule_delayed_work(&wacom->init_work, msecs_to_jiffies(1000));
1519 }
1520 
1521 static enum power_supply_property wacom_battery_props[] = {
1522 	POWER_SUPPLY_PROP_MODEL_NAME,
1523 	POWER_SUPPLY_PROP_PRESENT,
1524 	POWER_SUPPLY_PROP_STATUS,
1525 	POWER_SUPPLY_PROP_SCOPE,
1526 	POWER_SUPPLY_PROP_CAPACITY
1527 };
1528 
1529 static int wacom_battery_get_property(struct power_supply *psy,
1530 				      enum power_supply_property psp,
1531 				      union power_supply_propval *val)
1532 {
1533 	struct wacom_battery *battery = power_supply_get_drvdata(psy);
1534 	int ret = 0;
1535 
1536 	switch (psp) {
1537 		case POWER_SUPPLY_PROP_MODEL_NAME:
1538 			val->strval = battery->wacom->wacom_wac.name;
1539 			break;
1540 		case POWER_SUPPLY_PROP_PRESENT:
1541 			val->intval = battery->bat_connected;
1542 			break;
1543 		case POWER_SUPPLY_PROP_SCOPE:
1544 			val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1545 			break;
1546 		case POWER_SUPPLY_PROP_CAPACITY:
1547 			val->intval = battery->battery_capacity;
1548 			break;
1549 		case POWER_SUPPLY_PROP_STATUS:
1550 			if (battery->bat_charging)
1551 				val->intval = POWER_SUPPLY_STATUS_CHARGING;
1552 			else if (battery->battery_capacity == 100 &&
1553 				    battery->ps_connected)
1554 				val->intval = POWER_SUPPLY_STATUS_FULL;
1555 			else if (battery->ps_connected)
1556 				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1557 			else
1558 				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1559 			break;
1560 		default:
1561 			ret = -EINVAL;
1562 			break;
1563 	}
1564 
1565 	return ret;
1566 }
1567 
1568 static int __wacom_initialize_battery(struct wacom *wacom,
1569 				      struct wacom_battery *battery)
1570 {
1571 	static atomic_t battery_no = ATOMIC_INIT(0);
1572 	struct device *dev = &wacom->hdev->dev;
1573 	struct power_supply_config psy_cfg = { .drv_data = battery, };
1574 	struct power_supply *ps_bat;
1575 	struct power_supply_desc *bat_desc = &battery->bat_desc;
1576 	unsigned long n;
1577 	int error;
1578 
1579 	if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1580 		return -ENOMEM;
1581 
1582 	battery->wacom = wacom;
1583 
1584 	n = atomic_inc_return(&battery_no) - 1;
1585 
1586 	bat_desc->properties = wacom_battery_props;
1587 	bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1588 	bat_desc->get_property = wacom_battery_get_property;
1589 	sprintf(battery->bat_name, "wacom_battery_%ld", n);
1590 	bat_desc->name = battery->bat_name;
1591 	bat_desc->type = POWER_SUPPLY_TYPE_USB;
1592 	bat_desc->use_for_apm = 0;
1593 
1594 	ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1595 	if (IS_ERR(ps_bat)) {
1596 		error = PTR_ERR(ps_bat);
1597 		goto err;
1598 	}
1599 
1600 	power_supply_powers(ps_bat, &wacom->hdev->dev);
1601 
1602 	battery->battery = ps_bat;
1603 
1604 	devres_close_group(dev, bat_desc);
1605 	return 0;
1606 
1607 err:
1608 	devres_release_group(dev, bat_desc);
1609 	return error;
1610 }
1611 
1612 static int wacom_initialize_battery(struct wacom *wacom)
1613 {
1614 	if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1615 		return __wacom_initialize_battery(wacom, &wacom->battery);
1616 
1617 	return 0;
1618 }
1619 
1620 static void wacom_destroy_battery(struct wacom *wacom)
1621 {
1622 	if (wacom->battery.battery) {
1623 		devres_release_group(&wacom->hdev->dev,
1624 				     &wacom->battery.bat_desc);
1625 		wacom->battery.battery = NULL;
1626 	}
1627 }
1628 
1629 static ssize_t wacom_show_speed(struct device *dev,
1630 				struct device_attribute
1631 				*attr, char *buf)
1632 {
1633 	struct hid_device *hdev = to_hid_device(dev);
1634 	struct wacom *wacom = hid_get_drvdata(hdev);
1635 
1636 	return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
1637 }
1638 
1639 static ssize_t wacom_store_speed(struct device *dev,
1640 				struct device_attribute *attr,
1641 				const char *buf, size_t count)
1642 {
1643 	struct hid_device *hdev = to_hid_device(dev);
1644 	struct wacom *wacom = hid_get_drvdata(hdev);
1645 	u8 new_speed;
1646 
1647 	if (kstrtou8(buf, 0, &new_speed))
1648 		return -EINVAL;
1649 
1650 	if (new_speed != 0 && new_speed != 1)
1651 		return -EINVAL;
1652 
1653 	wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1654 
1655 	return count;
1656 }
1657 
1658 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1659 		wacom_show_speed, wacom_store_speed);
1660 
1661 
1662 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1663 				      struct kobj_attribute *kattr,
1664 				      char *buf, int index)
1665 {
1666 	struct device *dev = kobj_to_dev(kobj->parent);
1667 	struct hid_device *hdev = to_hid_device(dev);
1668 	struct wacom *wacom = hid_get_drvdata(hdev);
1669 	u8 mode;
1670 
1671 	mode = wacom->led.groups[index].select;
1672 	if (mode >= 0 && mode < 3)
1673 		return snprintf(buf, PAGE_SIZE, "%d\n", mode);
1674 	else
1675 		return snprintf(buf, PAGE_SIZE, "%d\n", -1);
1676 }
1677 
1678 #define DEVICE_EKR_ATTR_GROUP(SET_ID)					\
1679 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,	\
1680 			       struct kobj_attribute *kattr, char *buf)	\
1681 {									\
1682 	return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);	\
1683 }									\
1684 static struct kobj_attribute remote##SET_ID##_mode_attr = {		\
1685 	.attr = {.name = "remote_mode",					\
1686 		.mode = DEV_ATTR_RO_PERM},				\
1687 	.show = wacom_show_remote##SET_ID##_mode,			\
1688 };									\
1689 static struct attribute *remote##SET_ID##_serial_attrs[] = {		\
1690 	&remote##SET_ID##_mode_attr.attr,				\
1691 	NULL								\
1692 };									\
1693 static struct attribute_group remote##SET_ID##_serial_group = {		\
1694 	.name = NULL,							\
1695 	.attrs = remote##SET_ID##_serial_attrs,				\
1696 }
1697 
1698 DEVICE_EKR_ATTR_GROUP(0);
1699 DEVICE_EKR_ATTR_GROUP(1);
1700 DEVICE_EKR_ATTR_GROUP(2);
1701 DEVICE_EKR_ATTR_GROUP(3);
1702 DEVICE_EKR_ATTR_GROUP(4);
1703 
1704 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1705 					  int index)
1706 {
1707 	int error = 0;
1708 	struct wacom_remote *remote = wacom->remote;
1709 
1710 	remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1711 							  GFP_KERNEL,
1712 							  "%d", serial);
1713 	if (!remote->remotes[index].group.name)
1714 		return -ENOMEM;
1715 
1716 	error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1717 						&remote->remotes[index].group);
1718 	if (error) {
1719 		remote->remotes[index].group.name = NULL;
1720 		hid_err(wacom->hdev,
1721 			"cannot create sysfs group err: %d\n", error);
1722 		return error;
1723 	}
1724 
1725 	return 0;
1726 }
1727 
1728 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1729 {
1730 	const size_t buf_size = 2;
1731 	unsigned char *buf;
1732 	int retval;
1733 
1734 	buf = kzalloc(buf_size, GFP_KERNEL);
1735 	if (!buf)
1736 		return -ENOMEM;
1737 
1738 	buf[0] = WAC_CMD_DELETE_PAIRING;
1739 	buf[1] = selector;
1740 
1741 	retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1742 				  buf_size, WAC_CMD_RETRIES);
1743 	kfree(buf);
1744 
1745 	return retval;
1746 }
1747 
1748 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1749 					 struct kobj_attribute *attr,
1750 					 const char *buf, size_t count)
1751 {
1752 	unsigned char selector = 0;
1753 	struct device *dev = kobj_to_dev(kobj->parent);
1754 	struct hid_device *hdev = to_hid_device(dev);
1755 	struct wacom *wacom = hid_get_drvdata(hdev);
1756 	int err;
1757 
1758 	if (!strncmp(buf, "*\n", 2)) {
1759 		selector = WAC_CMD_UNPAIR_ALL;
1760 	} else {
1761 		hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1762 			 buf);
1763 		return -1;
1764 	}
1765 
1766 	mutex_lock(&wacom->lock);
1767 
1768 	err = wacom_cmd_unpair_remote(wacom, selector);
1769 	mutex_unlock(&wacom->lock);
1770 
1771 	return err < 0 ? err : count;
1772 }
1773 
1774 static struct kobj_attribute unpair_remote_attr = {
1775 	.attr = {.name = "unpair_remote", .mode = 0200},
1776 	.store = wacom_store_unpair_remote,
1777 };
1778 
1779 static const struct attribute *remote_unpair_attrs[] = {
1780 	&unpair_remote_attr.attr,
1781 	NULL
1782 };
1783 
1784 static void wacom_remotes_destroy(void *data)
1785 {
1786 	struct wacom *wacom = data;
1787 	struct wacom_remote *remote = wacom->remote;
1788 
1789 	if (!remote)
1790 		return;
1791 
1792 	kobject_put(remote->remote_dir);
1793 	kfifo_free(&remote->remote_fifo);
1794 	wacom->remote = NULL;
1795 }
1796 
1797 static int wacom_initialize_remotes(struct wacom *wacom)
1798 {
1799 	int error = 0;
1800 	struct wacom_remote *remote;
1801 	int i;
1802 
1803 	if (wacom->wacom_wac.features.type != REMOTE)
1804 		return 0;
1805 
1806 	remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1807 			      GFP_KERNEL);
1808 	if (!remote)
1809 		return -ENOMEM;
1810 
1811 	wacom->remote = remote;
1812 
1813 	spin_lock_init(&remote->remote_lock);
1814 
1815 	error = kfifo_alloc(&remote->remote_fifo,
1816 			5 * sizeof(struct wacom_remote_data),
1817 			GFP_KERNEL);
1818 	if (error) {
1819 		hid_err(wacom->hdev, "failed allocating remote_fifo\n");
1820 		return -ENOMEM;
1821 	}
1822 
1823 	remote->remotes[0].group = remote0_serial_group;
1824 	remote->remotes[1].group = remote1_serial_group;
1825 	remote->remotes[2].group = remote2_serial_group;
1826 	remote->remotes[3].group = remote3_serial_group;
1827 	remote->remotes[4].group = remote4_serial_group;
1828 
1829 	remote->remote_dir = kobject_create_and_add("wacom_remote",
1830 						    &wacom->hdev->dev.kobj);
1831 	if (!remote->remote_dir)
1832 		return -ENOMEM;
1833 
1834 	error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
1835 
1836 	if (error) {
1837 		hid_err(wacom->hdev,
1838 			"cannot create sysfs group err: %d\n", error);
1839 		return error;
1840 	}
1841 
1842 	for (i = 0; i < WACOM_MAX_REMOTES; i++) {
1843 		wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
1844 		remote->remotes[i].serial = 0;
1845 	}
1846 
1847 	error = devm_add_action_or_reset(&wacom->hdev->dev,
1848 					 wacom_remotes_destroy, wacom);
1849 	if (error)
1850 		return error;
1851 
1852 	return 0;
1853 }
1854 
1855 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
1856 {
1857 	struct input_dev *input_dev;
1858 	struct hid_device *hdev = wacom->hdev;
1859 	struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1860 
1861 	input_dev = devm_input_allocate_device(&hdev->dev);
1862 	if (!input_dev)
1863 		return NULL;
1864 
1865 	input_dev->name = wacom_wac->features.name;
1866 	input_dev->phys = hdev->phys;
1867 	input_dev->dev.parent = &hdev->dev;
1868 	input_dev->open = wacom_open;
1869 	input_dev->close = wacom_close;
1870 	input_dev->uniq = hdev->uniq;
1871 	input_dev->id.bustype = hdev->bus;
1872 	input_dev->id.vendor  = hdev->vendor;
1873 	input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
1874 	input_dev->id.version = hdev->version;
1875 	input_set_drvdata(input_dev, wacom);
1876 
1877 	return input_dev;
1878 }
1879 
1880 static int wacom_allocate_inputs(struct wacom *wacom)
1881 {
1882 	struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1883 
1884 	wacom_wac->pen_input = wacom_allocate_input(wacom);
1885 	wacom_wac->touch_input = wacom_allocate_input(wacom);
1886 	wacom_wac->pad_input = wacom_allocate_input(wacom);
1887 	if (!wacom_wac->pen_input ||
1888 	    !wacom_wac->touch_input ||
1889 	    !wacom_wac->pad_input)
1890 		return -ENOMEM;
1891 
1892 	wacom_wac->pen_input->name = wacom_wac->pen_name;
1893 	wacom_wac->touch_input->name = wacom_wac->touch_name;
1894 	wacom_wac->pad_input->name = wacom_wac->pad_name;
1895 
1896 	return 0;
1897 }
1898 
1899 static int wacom_register_inputs(struct wacom *wacom)
1900 {
1901 	struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
1902 	struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1903 	int error = 0;
1904 
1905 	pen_input_dev = wacom_wac->pen_input;
1906 	touch_input_dev = wacom_wac->touch_input;
1907 	pad_input_dev = wacom_wac->pad_input;
1908 
1909 	if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
1910 		return -EINVAL;
1911 
1912 	error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
1913 	if (error) {
1914 		/* no pen in use on this interface */
1915 		input_free_device(pen_input_dev);
1916 		wacom_wac->pen_input = NULL;
1917 		pen_input_dev = NULL;
1918 	} else {
1919 		error = input_register_device(pen_input_dev);
1920 		if (error)
1921 			goto fail;
1922 	}
1923 
1924 	error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
1925 	if (error) {
1926 		/* no touch in use on this interface */
1927 		input_free_device(touch_input_dev);
1928 		wacom_wac->touch_input = NULL;
1929 		touch_input_dev = NULL;
1930 	} else {
1931 		error = input_register_device(touch_input_dev);
1932 		if (error)
1933 			goto fail;
1934 	}
1935 
1936 	error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
1937 	if (error) {
1938 		/* no pad in use on this interface */
1939 		input_free_device(pad_input_dev);
1940 		wacom_wac->pad_input = NULL;
1941 		pad_input_dev = NULL;
1942 	} else {
1943 		error = input_register_device(pad_input_dev);
1944 		if (error)
1945 			goto fail;
1946 	}
1947 
1948 	return 0;
1949 
1950 fail:
1951 	wacom_wac->pad_input = NULL;
1952 	wacom_wac->touch_input = NULL;
1953 	wacom_wac->pen_input = NULL;
1954 	return error;
1955 }
1956 
1957 /*
1958  * Not all devices report physical dimensions from HID.
1959  * Compute the default from hardcoded logical dimension
1960  * and resolution before driver overwrites them.
1961  */
1962 static void wacom_set_default_phy(struct wacom_features *features)
1963 {
1964 	if (features->x_resolution) {
1965 		features->x_phy = (features->x_max * 100) /
1966 					features->x_resolution;
1967 		features->y_phy = (features->y_max * 100) /
1968 					features->y_resolution;
1969 	}
1970 }
1971 
1972 static void wacom_calculate_res(struct wacom_features *features)
1973 {
1974 	/* set unit to "100th of a mm" for devices not reported by HID */
1975 	if (!features->unit) {
1976 		features->unit = 0x11;
1977 		features->unitExpo = -3;
1978 	}
1979 
1980 	features->x_resolution = wacom_calc_hid_res(features->x_max,
1981 						    features->x_phy,
1982 						    features->unit,
1983 						    features->unitExpo);
1984 	features->y_resolution = wacom_calc_hid_res(features->y_max,
1985 						    features->y_phy,
1986 						    features->unit,
1987 						    features->unitExpo);
1988 }
1989 
1990 void wacom_battery_work(struct work_struct *work)
1991 {
1992 	struct wacom *wacom = container_of(work, struct wacom, battery_work);
1993 
1994 	if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1995 	     !wacom->battery.battery) {
1996 		wacom_initialize_battery(wacom);
1997 	}
1998 	else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1999 		 wacom->battery.battery) {
2000 		wacom_destroy_battery(wacom);
2001 	}
2002 }
2003 
2004 static size_t wacom_compute_pktlen(struct hid_device *hdev)
2005 {
2006 	struct hid_report_enum *report_enum;
2007 	struct hid_report *report;
2008 	size_t size = 0;
2009 
2010 	report_enum = hdev->report_enum + HID_INPUT_REPORT;
2011 
2012 	list_for_each_entry(report, &report_enum->report_list, list) {
2013 		size_t report_size = hid_report_len(report);
2014 		if (report_size > size)
2015 			size = report_size;
2016 	}
2017 
2018 	return size;
2019 }
2020 
2021 static void wacom_update_name(struct wacom *wacom, const char *suffix)
2022 {
2023 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2024 	struct wacom_features *features = &wacom_wac->features;
2025 	char name[WACOM_NAME_MAX];
2026 
2027 	/* Generic devices name unspecified */
2028 	if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
2029 		if (strstr(wacom->hdev->name, "Wacom") ||
2030 		    strstr(wacom->hdev->name, "wacom") ||
2031 		    strstr(wacom->hdev->name, "WACOM")) {
2032 			/* name is in HID descriptor, use it */
2033 			strlcpy(name, wacom->hdev->name, sizeof(name));
2034 
2035 			/* strip out excess whitespaces */
2036 			while (1) {
2037 				char *gap = strstr(name, "  ");
2038 				if (gap == NULL)
2039 					break;
2040 				/* shift everything including the terminator */
2041 				memmove(gap, gap+1, strlen(gap));
2042 			}
2043 
2044 			/* strip off excessive prefixing */
2045 			if (strstr(name, "Wacom Co.,Ltd. Wacom ") == name) {
2046 				int n = strlen(name);
2047 				int x = strlen("Wacom Co.,Ltd. ");
2048 				memmove(name, name+x, n-x+1);
2049 			}
2050 			if (strstr(name, "Wacom Co., Ltd. Wacom ") == name) {
2051 				int n = strlen(name);
2052 				int x = strlen("Wacom Co., Ltd. ");
2053 				memmove(name, name+x, n-x+1);
2054 			}
2055 
2056 			/* get rid of trailing whitespace */
2057 			if (name[strlen(name)-1] == ' ')
2058 				name[strlen(name)-1] = '\0';
2059 		} else {
2060 			/* no meaningful name retrieved. use product ID */
2061 			snprintf(name, sizeof(name),
2062 				 "%s %X", features->name, wacom->hdev->product);
2063 		}
2064 	} else {
2065 		strlcpy(name, features->name, sizeof(name));
2066 	}
2067 
2068 	snprintf(wacom_wac->name, sizeof(wacom_wac->name), "%s%s",
2069 		 name, suffix);
2070 
2071 	/* Append the device type to the name */
2072 	snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
2073 		"%s%s Pen", name, suffix);
2074 	snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
2075 		"%s%s Finger", name, suffix);
2076 	snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
2077 		"%s%s Pad", name, suffix);
2078 }
2079 
2080 static void wacom_release_resources(struct wacom *wacom)
2081 {
2082 	struct hid_device *hdev = wacom->hdev;
2083 
2084 	if (!wacom->resources)
2085 		return;
2086 
2087 	devres_release_group(&hdev->dev, wacom);
2088 
2089 	wacom->resources = false;
2090 
2091 	wacom->wacom_wac.pen_input = NULL;
2092 	wacom->wacom_wac.touch_input = NULL;
2093 	wacom->wacom_wac.pad_input = NULL;
2094 }
2095 
2096 static void wacom_set_shared_values(struct wacom_wac *wacom_wac)
2097 {
2098 	if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH) {
2099 		wacom_wac->shared->type = wacom_wac->features.type;
2100 		wacom_wac->shared->touch_input = wacom_wac->touch_input;
2101 	}
2102 
2103 	if (wacom_wac->has_mute_touch_switch) {
2104 		wacom_wac->shared->has_mute_touch_switch = true;
2105 		wacom_wac->shared->is_touch_on = true;
2106 	}
2107 
2108 	if (wacom_wac->shared->has_mute_touch_switch &&
2109 	    wacom_wac->shared->touch_input) {
2110 		set_bit(EV_SW, wacom_wac->shared->touch_input->evbit);
2111 		input_set_capability(wacom_wac->shared->touch_input, EV_SW,
2112 				     SW_MUTE_DEVICE);
2113 	}
2114 }
2115 
2116 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
2117 {
2118 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2119 	struct wacom_features *features = &wacom_wac->features;
2120 	struct hid_device *hdev = wacom->hdev;
2121 	int error;
2122 	unsigned int connect_mask = HID_CONNECT_HIDRAW;
2123 
2124 	features->pktlen = wacom_compute_pktlen(hdev);
2125 	if (features->pktlen > WACOM_PKGLEN_MAX)
2126 		return -EINVAL;
2127 
2128 	if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
2129 		return -ENOMEM;
2130 
2131 	wacom->resources = true;
2132 
2133 	error = wacom_allocate_inputs(wacom);
2134 	if (error)
2135 		goto fail;
2136 
2137 	/*
2138 	 * Bamboo Pad has a generic hid handling for the Pen, and we switch it
2139 	 * into debug mode for the touch part.
2140 	 * We ignore the other interfaces.
2141 	 */
2142 	if (features->type == BAMBOO_PAD) {
2143 		if (features->pktlen == WACOM_PKGLEN_PENABLED) {
2144 			features->type = HID_GENERIC;
2145 		} else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
2146 			   (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
2147 			error = -ENODEV;
2148 			goto fail;
2149 		}
2150 	}
2151 
2152 	/* set the default size in case we do not get them from hid */
2153 	wacom_set_default_phy(features);
2154 
2155 	/* Retrieve the physical and logical size for touch devices */
2156 	wacom_retrieve_hid_descriptor(hdev, features);
2157 	wacom_setup_device_quirks(wacom);
2158 
2159 	if (features->device_type == WACOM_DEVICETYPE_NONE &&
2160 	    features->type != WIRELESS) {
2161 		error = features->type == HID_GENERIC ? -ENODEV : 0;
2162 
2163 		dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
2164 			 hdev->name,
2165 			 error ? "Ignoring" : "Assuming pen");
2166 
2167 		if (error)
2168 			goto fail;
2169 
2170 		features->device_type |= WACOM_DEVICETYPE_PEN;
2171 	}
2172 
2173 	wacom_calculate_res(features);
2174 
2175 	wacom_update_name(wacom, wireless ? " (WL)" : "");
2176 
2177 	/* pen only Bamboo neither support touch nor pad */
2178 	if ((features->type == BAMBOO_PEN) &&
2179 	    ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
2180 	    (features->device_type & WACOM_DEVICETYPE_PAD))) {
2181 		error = -ENODEV;
2182 		goto fail;
2183 	}
2184 
2185 	error = wacom_add_shared_data(hdev);
2186 	if (error)
2187 		goto fail;
2188 
2189 	if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
2190 	     (features->quirks & WACOM_QUIRK_BATTERY)) {
2191 		error = wacom_initialize_battery(wacom);
2192 		if (error)
2193 			goto fail;
2194 	}
2195 
2196 	error = wacom_register_inputs(wacom);
2197 	if (error)
2198 		goto fail;
2199 
2200 	if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
2201 		error = wacom_initialize_leds(wacom);
2202 		if (error)
2203 			goto fail;
2204 
2205 		error = wacom_initialize_remotes(wacom);
2206 		if (error)
2207 			goto fail;
2208 	}
2209 
2210 	if (features->type == HID_GENERIC)
2211 		connect_mask |= HID_CONNECT_DRIVER;
2212 
2213 	/* Regular HID work starts now */
2214 	error = hid_hw_start(hdev, connect_mask);
2215 	if (error) {
2216 		hid_err(hdev, "hw start failed\n");
2217 		goto fail;
2218 	}
2219 
2220 	if (!wireless) {
2221 		/* Note that if query fails it is not a hard failure */
2222 		wacom_query_tablet_data(wacom);
2223 	}
2224 
2225 	/* touch only Bamboo doesn't support pen */
2226 	if ((features->type == BAMBOO_TOUCH) &&
2227 	    (features->device_type & WACOM_DEVICETYPE_PEN)) {
2228 		cancel_delayed_work_sync(&wacom->init_work);
2229 		_wacom_query_tablet_data(wacom);
2230 		error = -ENODEV;
2231 		goto fail_quirks;
2232 	}
2233 
2234 	if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2235 		error = hid_hw_open(hdev);
2236 
2237 	wacom_set_shared_values(wacom_wac);
2238 	devres_close_group(&hdev->dev, wacom);
2239 
2240 	return 0;
2241 
2242 fail_quirks:
2243 	hid_hw_stop(hdev);
2244 fail:
2245 	wacom_release_resources(wacom);
2246 	return error;
2247 }
2248 
2249 static void wacom_wireless_work(struct work_struct *work)
2250 {
2251 	struct wacom *wacom = container_of(work, struct wacom, wireless_work);
2252 	struct usb_device *usbdev = wacom->usbdev;
2253 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2254 	struct hid_device *hdev1, *hdev2;
2255 	struct wacom *wacom1, *wacom2;
2256 	struct wacom_wac *wacom_wac1, *wacom_wac2;
2257 	int error;
2258 
2259 	/*
2260 	 * Regardless if this is a disconnect or a new tablet,
2261 	 * remove any existing input and battery devices.
2262 	 */
2263 
2264 	wacom_destroy_battery(wacom);
2265 
2266 	/* Stylus interface */
2267 	hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
2268 	wacom1 = hid_get_drvdata(hdev1);
2269 	wacom_wac1 = &(wacom1->wacom_wac);
2270 	wacom_release_resources(wacom1);
2271 
2272 	/* Touch interface */
2273 	hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
2274 	wacom2 = hid_get_drvdata(hdev2);
2275 	wacom_wac2 = &(wacom2->wacom_wac);
2276 	wacom_release_resources(wacom2);
2277 
2278 	if (wacom_wac->pid == 0) {
2279 		hid_info(wacom->hdev, "wireless tablet disconnected\n");
2280 	} else {
2281 		const struct hid_device_id *id = wacom_ids;
2282 
2283 		hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
2284 			 wacom_wac->pid);
2285 
2286 		while (id->bus) {
2287 			if (id->vendor == USB_VENDOR_ID_WACOM &&
2288 			    id->product == wacom_wac->pid)
2289 				break;
2290 			id++;
2291 		}
2292 
2293 		if (!id->bus) {
2294 			hid_info(wacom->hdev, "ignoring unknown PID.\n");
2295 			return;
2296 		}
2297 
2298 		/* Stylus interface */
2299 		wacom_wac1->features =
2300 			*((struct wacom_features *)id->driver_data);
2301 
2302 		wacom_wac1->pid = wacom_wac->pid;
2303 		hid_hw_stop(hdev1);
2304 		error = wacom_parse_and_register(wacom1, true);
2305 		if (error)
2306 			goto fail;
2307 
2308 		/* Touch interface */
2309 		if (wacom_wac1->features.touch_max ||
2310 		    (wacom_wac1->features.type >= INTUOSHT &&
2311 		    wacom_wac1->features.type <= BAMBOO_PT)) {
2312 			wacom_wac2->features =
2313 				*((struct wacom_features *)id->driver_data);
2314 			wacom_wac2->pid = wacom_wac->pid;
2315 			hid_hw_stop(hdev2);
2316 			error = wacom_parse_and_register(wacom2, true);
2317 			if (error)
2318 				goto fail;
2319 		}
2320 
2321 		strlcpy(wacom_wac->name, wacom_wac1->name,
2322 			sizeof(wacom_wac->name));
2323 		error = wacom_initialize_battery(wacom);
2324 		if (error)
2325 			goto fail;
2326 	}
2327 
2328 	return;
2329 
2330 fail:
2331 	wacom_release_resources(wacom1);
2332 	wacom_release_resources(wacom2);
2333 	return;
2334 }
2335 
2336 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
2337 {
2338 	struct wacom_remote *remote = wacom->remote;
2339 	u32 serial = remote->remotes[index].serial;
2340 	int i;
2341 	unsigned long flags;
2342 
2343 	spin_lock_irqsave(&remote->remote_lock, flags);
2344 	remote->remotes[index].registered = false;
2345 	spin_unlock_irqrestore(&remote->remote_lock, flags);
2346 
2347 	if (remote->remotes[index].battery.battery)
2348 		devres_release_group(&wacom->hdev->dev,
2349 				     &remote->remotes[index].battery.bat_desc);
2350 
2351 	if (remote->remotes[index].group.name)
2352 		devres_release_group(&wacom->hdev->dev,
2353 				     &remote->remotes[index]);
2354 
2355 	for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2356 		if (remote->remotes[i].serial == serial) {
2357 			remote->remotes[i].serial = 0;
2358 			remote->remotes[i].group.name = NULL;
2359 			remote->remotes[i].registered = false;
2360 			remote->remotes[i].battery.battery = NULL;
2361 			wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2362 		}
2363 	}
2364 }
2365 
2366 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
2367 				   unsigned int index)
2368 {
2369 	struct wacom_remote *remote = wacom->remote;
2370 	struct device *dev = &wacom->hdev->dev;
2371 	int error, k;
2372 
2373 	/* A remote can pair more than once with an EKR,
2374 	 * check to make sure this serial isn't already paired.
2375 	 */
2376 	for (k = 0; k < WACOM_MAX_REMOTES; k++) {
2377 		if (remote->remotes[k].serial == serial)
2378 			break;
2379 	}
2380 
2381 	if (k < WACOM_MAX_REMOTES) {
2382 		remote->remotes[index].serial = serial;
2383 		return 0;
2384 	}
2385 
2386 	if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
2387 		return -ENOMEM;
2388 
2389 	error = wacom_remote_create_attr_group(wacom, serial, index);
2390 	if (error)
2391 		goto fail;
2392 
2393 	remote->remotes[index].input = wacom_allocate_input(wacom);
2394 	if (!remote->remotes[index].input) {
2395 		error = -ENOMEM;
2396 		goto fail;
2397 	}
2398 	remote->remotes[index].input->uniq = remote->remotes[index].group.name;
2399 	remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
2400 
2401 	if (!remote->remotes[index].input->name) {
2402 		error = -EINVAL;
2403 		goto fail;
2404 	}
2405 
2406 	error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
2407 						   &wacom->wacom_wac);
2408 	if (error)
2409 		goto fail;
2410 
2411 	remote->remotes[index].serial = serial;
2412 
2413 	error = input_register_device(remote->remotes[index].input);
2414 	if (error)
2415 		goto fail;
2416 
2417 	error = wacom_led_groups_alloc_and_register_one(
2418 					&remote->remotes[index].input->dev,
2419 					wacom, index, 3, true);
2420 	if (error)
2421 		goto fail;
2422 
2423 	remote->remotes[index].registered = true;
2424 
2425 	devres_close_group(dev, &remote->remotes[index]);
2426 	return 0;
2427 
2428 fail:
2429 	devres_release_group(dev, &remote->remotes[index]);
2430 	remote->remotes[index].serial = 0;
2431 	return error;
2432 }
2433 
2434 static int wacom_remote_attach_battery(struct wacom *wacom, int index)
2435 {
2436 	struct wacom_remote *remote = wacom->remote;
2437 	int error;
2438 
2439 	if (!remote->remotes[index].registered)
2440 		return 0;
2441 
2442 	if (remote->remotes[index].battery.battery)
2443 		return 0;
2444 
2445 	if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN)
2446 		return 0;
2447 
2448 	error = __wacom_initialize_battery(wacom,
2449 					&wacom->remote->remotes[index].battery);
2450 	if (error)
2451 		return error;
2452 
2453 	return 0;
2454 }
2455 
2456 static void wacom_remote_work(struct work_struct *work)
2457 {
2458 	struct wacom *wacom = container_of(work, struct wacom, remote_work);
2459 	struct wacom_remote *remote = wacom->remote;
2460 	struct wacom_remote_data data;
2461 	unsigned long flags;
2462 	unsigned int count;
2463 	u32 serial;
2464 	int i;
2465 
2466 	spin_lock_irqsave(&remote->remote_lock, flags);
2467 
2468 	count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2469 
2470 	if (count != sizeof(data)) {
2471 		hid_err(wacom->hdev,
2472 			"workitem triggered without status available\n");
2473 		spin_unlock_irqrestore(&remote->remote_lock, flags);
2474 		return;
2475 	}
2476 
2477 	if (!kfifo_is_empty(&remote->remote_fifo))
2478 		wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2479 
2480 	spin_unlock_irqrestore(&remote->remote_lock, flags);
2481 
2482 	for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2483 		serial = data.remote[i].serial;
2484 		if (data.remote[i].connected) {
2485 
2486 			if (remote->remotes[i].serial == serial) {
2487 				wacom_remote_attach_battery(wacom, i);
2488 				continue;
2489 			}
2490 
2491 			if (remote->remotes[i].serial)
2492 				wacom_remote_destroy_one(wacom, i);
2493 
2494 			wacom_remote_create_one(wacom, serial, i);
2495 
2496 		} else if (remote->remotes[i].serial) {
2497 			wacom_remote_destroy_one(wacom, i);
2498 		}
2499 	}
2500 }
2501 
2502 static void wacom_mode_change_work(struct work_struct *work)
2503 {
2504 	struct wacom *wacom = container_of(work, struct wacom, mode_change_work);
2505 	struct wacom_shared *shared = wacom->wacom_wac.shared;
2506 	struct wacom *wacom1 = NULL;
2507 	struct wacom *wacom2 = NULL;
2508 	bool is_direct = wacom->wacom_wac.is_direct_mode;
2509 	int error = 0;
2510 
2511 	if (shared->pen) {
2512 		wacom1 = hid_get_drvdata(shared->pen);
2513 		wacom_release_resources(wacom1);
2514 		hid_hw_stop(wacom1->hdev);
2515 		wacom1->wacom_wac.has_mode_change = true;
2516 		wacom1->wacom_wac.is_direct_mode = is_direct;
2517 	}
2518 
2519 	if (shared->touch) {
2520 		wacom2 = hid_get_drvdata(shared->touch);
2521 		wacom_release_resources(wacom2);
2522 		hid_hw_stop(wacom2->hdev);
2523 		wacom2->wacom_wac.has_mode_change = true;
2524 		wacom2->wacom_wac.is_direct_mode = is_direct;
2525 	}
2526 
2527 	if (wacom1) {
2528 		error = wacom_parse_and_register(wacom1, false);
2529 		if (error)
2530 			return;
2531 	}
2532 
2533 	if (wacom2) {
2534 		error = wacom_parse_and_register(wacom2, false);
2535 		if (error)
2536 			return;
2537 	}
2538 
2539 	return;
2540 }
2541 
2542 static int wacom_probe(struct hid_device *hdev,
2543 		const struct hid_device_id *id)
2544 {
2545 	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2546 	struct usb_device *dev = interface_to_usbdev(intf);
2547 	struct wacom *wacom;
2548 	struct wacom_wac *wacom_wac;
2549 	struct wacom_features *features;
2550 	int error;
2551 
2552 	if (!id->driver_data)
2553 		return -EINVAL;
2554 
2555 	hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2556 
2557 	/* hid-core sets this quirk for the boot interface */
2558 	hdev->quirks &= ~HID_QUIRK_NOGET;
2559 
2560 	wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2561 	if (!wacom)
2562 		return -ENOMEM;
2563 
2564 	hid_set_drvdata(hdev, wacom);
2565 	wacom->hdev = hdev;
2566 
2567 	wacom_wac = &wacom->wacom_wac;
2568 	wacom_wac->features = *((struct wacom_features *)id->driver_data);
2569 	features = &wacom_wac->features;
2570 
2571 	if (features->check_for_hid_type && features->hid_type != hdev->type) {
2572 		error = -ENODEV;
2573 		goto fail;
2574 	}
2575 
2576 	wacom_wac->hid_data.inputmode = -1;
2577 	wacom_wac->mode_report = -1;
2578 
2579 	wacom->usbdev = dev;
2580 	wacom->intf = intf;
2581 	mutex_init(&wacom->lock);
2582 	INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
2583 	INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2584 	INIT_WORK(&wacom->battery_work, wacom_battery_work);
2585 	INIT_WORK(&wacom->remote_work, wacom_remote_work);
2586 	INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
2587 
2588 	/* ask for the report descriptor to be loaded by HID */
2589 	error = hid_parse(hdev);
2590 	if (error) {
2591 		hid_err(hdev, "parse failed\n");
2592 		goto fail;
2593 	}
2594 
2595 	error = wacom_parse_and_register(wacom, false);
2596 	if (error)
2597 		goto fail;
2598 
2599 	if (hdev->bus == BUS_BLUETOOTH) {
2600 		error = device_create_file(&hdev->dev, &dev_attr_speed);
2601 		if (error)
2602 			hid_warn(hdev,
2603 				 "can't create sysfs speed attribute err: %d\n",
2604 				 error);
2605 	}
2606 
2607 	return 0;
2608 
2609 fail:
2610 	hid_set_drvdata(hdev, NULL);
2611 	return error;
2612 }
2613 
2614 static void wacom_remove(struct hid_device *hdev)
2615 {
2616 	struct wacom *wacom = hid_get_drvdata(hdev);
2617 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2618 	struct wacom_features *features = &wacom_wac->features;
2619 
2620 	if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2621 		hid_hw_close(hdev);
2622 
2623 	hid_hw_stop(hdev);
2624 
2625 	cancel_delayed_work_sync(&wacom->init_work);
2626 	cancel_work_sync(&wacom->wireless_work);
2627 	cancel_work_sync(&wacom->battery_work);
2628 	cancel_work_sync(&wacom->remote_work);
2629 	cancel_work_sync(&wacom->mode_change_work);
2630 	if (hdev->bus == BUS_BLUETOOTH)
2631 		device_remove_file(&hdev->dev, &dev_attr_speed);
2632 
2633 	/* make sure we don't trigger the LEDs */
2634 	wacom_led_groups_release(wacom);
2635 
2636 	if (wacom->wacom_wac.features.type != REMOTE)
2637 		wacom_release_resources(wacom);
2638 
2639 	hid_set_drvdata(hdev, NULL);
2640 }
2641 
2642 #ifdef CONFIG_PM
2643 static int wacom_resume(struct hid_device *hdev)
2644 {
2645 	struct wacom *wacom = hid_get_drvdata(hdev);
2646 
2647 	mutex_lock(&wacom->lock);
2648 
2649 	/* switch to wacom mode first */
2650 	_wacom_query_tablet_data(wacom);
2651 	wacom_led_control(wacom);
2652 
2653 	mutex_unlock(&wacom->lock);
2654 
2655 	return 0;
2656 }
2657 
2658 static int wacom_reset_resume(struct hid_device *hdev)
2659 {
2660 	return wacom_resume(hdev);
2661 }
2662 #endif /* CONFIG_PM */
2663 
2664 static struct hid_driver wacom_driver = {
2665 	.name =		"wacom",
2666 	.id_table =	wacom_ids,
2667 	.probe =	wacom_probe,
2668 	.remove =	wacom_remove,
2669 	.report =	wacom_wac_report,
2670 #ifdef CONFIG_PM
2671 	.resume =	wacom_resume,
2672 	.reset_resume =	wacom_reset_resume,
2673 #endif
2674 	.raw_event =	wacom_raw_event,
2675 };
2676 module_hid_driver(wacom_driver);
2677 
2678 MODULE_VERSION(DRIVER_VERSION);
2679 MODULE_AUTHOR(DRIVER_AUTHOR);
2680 MODULE_DESCRIPTION(DRIVER_DESC);
2681 MODULE_LICENSE("GPL");
2682