1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Copyright (c) 2000-2001 Vojtech Pavlik
4  *  Copyright (c) 2006-2010 Jiri Kosina
5  *
6  *  HID to Linux Input mapping
7  */
8 
9 /*
10  *
11  * Should you need to contact me, the author, you can do so either by
12  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
13  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
14  */
15 
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/kernel.h>
19 
20 #include <linux/hid.h>
21 #include <linux/hid-debug.h>
22 
23 #include "hid-ids.h"
24 
25 #define unk	KEY_UNKNOWN
26 
27 static const unsigned char hid_keyboard[256] = {
28 	  0,  0,  0,  0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
29 	 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44,  2,  3,
30 	  4,  5,  6,  7,  8,  9, 10, 11, 28,  1, 14, 15, 57, 12, 13, 26,
31 	 27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
32 	 65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
33 	105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
34 	 72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
35 	191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
36 	115,114,unk,unk,unk,121,unk, 89, 93,124, 92, 94, 95,unk,unk,unk,
37 	122,123, 90, 91, 85,unk,unk,unk,unk,unk,unk,unk,111,unk,unk,unk,
38 	unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
39 	unk,unk,unk,unk,unk,unk,179,180,unk,unk,unk,unk,unk,unk,unk,unk,
40 	unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
41 	unk,unk,unk,unk,unk,unk,unk,unk,111,unk,unk,unk,unk,unk,unk,unk,
42 	 29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
43 	150,158,159,128,136,177,178,176,142,152,173,140,unk,unk,unk,unk
44 };
45 
46 static const struct {
47 	__s32 x;
48 	__s32 y;
49 }  hid_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
50 
51 struct usage_priority {
52 	__u32 usage;			/* the HID usage associated */
53 	bool global;			/* we assume all usages to be slotted,
54 					 * unless global
55 					 */
56 	unsigned int slot_overwrite;	/* for globals: allows to set the usage
57 					 * before or after the slots
58 					 */
59 };
60 
61 /*
62  * hid-input will convert this list into priorities:
63  * the first element will have the highest priority
64  * (the length of the following array) and the last
65  * element the lowest (1).
66  *
67  * hid-input will then shift the priority by 8 bits to leave some space
68  * in case drivers want to interleave other fields.
69  *
70  * To accommodate slotted devices, the slot priority is
71  * defined in the next 8 bits (defined by 0xff - slot).
72  *
73  * If drivers want to add fields before those, hid-input will
74  * leave out the first 8 bits of the priority value.
75  *
76  * This still leaves us 65535 individual priority values.
77  */
78 static const struct usage_priority hidinput_usages_priorities[] = {
79 	{ /* Eraser (eraser touching) must always come before tipswitch */
80 	  .usage = HID_DG_ERASER,
81 	},
82 	{ /* Invert must always come before In Range */
83 	  .usage = HID_DG_INVERT,
84 	},
85 	{ /* Is the tip of the tool touching? */
86 	  .usage = HID_DG_TIPSWITCH,
87 	},
88 	{ /* Tip Pressure might emulate tip switch */
89 	  .usage = HID_DG_TIPPRESSURE,
90 	},
91 	{ /* In Range needs to come after the other tool states */
92 	  .usage = HID_DG_INRANGE,
93 	},
94 };
95 
96 #define map_abs(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_ABS, (c))
97 #define map_rel(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_REL, (c))
98 #define map_key(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_KEY, (c))
99 #define map_led(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_LED, (c))
100 #define map_msc(c)	hid_map_usage(hidinput, usage, &bit, &max, EV_MSC, (c))
101 
102 #define map_abs_clear(c)	hid_map_usage_clear(hidinput, usage, &bit, \
103 		&max, EV_ABS, (c))
104 #define map_key_clear(c)	hid_map_usage_clear(hidinput, usage, &bit, \
105 		&max, EV_KEY, (c))
106 
match_scancode(struct hid_usage * usage,unsigned int cur_idx,unsigned int scancode)107 static bool match_scancode(struct hid_usage *usage,
108 			   unsigned int cur_idx, unsigned int scancode)
109 {
110 	return (usage->hid & (HID_USAGE_PAGE | HID_USAGE)) == scancode;
111 }
112 
match_keycode(struct hid_usage * usage,unsigned int cur_idx,unsigned int keycode)113 static bool match_keycode(struct hid_usage *usage,
114 			  unsigned int cur_idx, unsigned int keycode)
115 {
116 	/*
117 	 * We should exclude unmapped usages when doing lookup by keycode.
118 	 */
119 	return (usage->type == EV_KEY && usage->code == keycode);
120 }
121 
match_index(struct hid_usage * usage,unsigned int cur_idx,unsigned int idx)122 static bool match_index(struct hid_usage *usage,
123 			unsigned int cur_idx, unsigned int idx)
124 {
125 	return cur_idx == idx;
126 }
127 
128 typedef bool (*hid_usage_cmp_t)(struct hid_usage *usage,
129 				unsigned int cur_idx, unsigned int val);
130 
hidinput_find_key(struct hid_device * hid,hid_usage_cmp_t match,unsigned int value,unsigned int * usage_idx)131 static struct hid_usage *hidinput_find_key(struct hid_device *hid,
132 					   hid_usage_cmp_t match,
133 					   unsigned int value,
134 					   unsigned int *usage_idx)
135 {
136 	unsigned int i, j, k, cur_idx = 0;
137 	struct hid_report *report;
138 	struct hid_usage *usage;
139 
140 	for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
141 		list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
142 			for (i = 0; i < report->maxfield; i++) {
143 				for (j = 0; j < report->field[i]->maxusage; j++) {
144 					usage = report->field[i]->usage + j;
145 					if (usage->type == EV_KEY || usage->type == 0) {
146 						if (match(usage, cur_idx, value)) {
147 							if (usage_idx)
148 								*usage_idx = cur_idx;
149 							return usage;
150 						}
151 						cur_idx++;
152 					}
153 				}
154 			}
155 		}
156 	}
157 	return NULL;
158 }
159 
hidinput_locate_usage(struct hid_device * hid,const struct input_keymap_entry * ke,unsigned int * index)160 static struct hid_usage *hidinput_locate_usage(struct hid_device *hid,
161 					const struct input_keymap_entry *ke,
162 					unsigned int *index)
163 {
164 	struct hid_usage *usage;
165 	unsigned int scancode;
166 
167 	if (ke->flags & INPUT_KEYMAP_BY_INDEX)
168 		usage = hidinput_find_key(hid, match_index, ke->index, index);
169 	else if (input_scancode_to_scalar(ke, &scancode) == 0)
170 		usage = hidinput_find_key(hid, match_scancode, scancode, index);
171 	else
172 		usage = NULL;
173 
174 	return usage;
175 }
176 
hidinput_getkeycode(struct input_dev * dev,struct input_keymap_entry * ke)177 static int hidinput_getkeycode(struct input_dev *dev,
178 			       struct input_keymap_entry *ke)
179 {
180 	struct hid_device *hid = input_get_drvdata(dev);
181 	struct hid_usage *usage;
182 	unsigned int scancode, index;
183 
184 	usage = hidinput_locate_usage(hid, ke, &index);
185 	if (usage) {
186 		ke->keycode = usage->type == EV_KEY ?
187 				usage->code : KEY_RESERVED;
188 		ke->index = index;
189 		scancode = usage->hid & (HID_USAGE_PAGE | HID_USAGE);
190 		ke->len = sizeof(scancode);
191 		memcpy(ke->scancode, &scancode, sizeof(scancode));
192 		return 0;
193 	}
194 
195 	return -EINVAL;
196 }
197 
hidinput_setkeycode(struct input_dev * dev,const struct input_keymap_entry * ke,unsigned int * old_keycode)198 static int hidinput_setkeycode(struct input_dev *dev,
199 			       const struct input_keymap_entry *ke,
200 			       unsigned int *old_keycode)
201 {
202 	struct hid_device *hid = input_get_drvdata(dev);
203 	struct hid_usage *usage;
204 
205 	usage = hidinput_locate_usage(hid, ke, NULL);
206 	if (usage) {
207 		*old_keycode = usage->type == EV_KEY ?
208 				usage->code : KEY_RESERVED;
209 		usage->type = EV_KEY;
210 		usage->code = ke->keycode;
211 
212 		clear_bit(*old_keycode, dev->keybit);
213 		set_bit(usage->code, dev->keybit);
214 		dbg_hid("Assigned keycode %d to HID usage code %x\n",
215 			usage->code, usage->hid);
216 
217 		/*
218 		 * Set the keybit for the old keycode if the old keycode is used
219 		 * by another key
220 		 */
221 		if (hidinput_find_key(hid, match_keycode, *old_keycode, NULL))
222 			set_bit(*old_keycode, dev->keybit);
223 
224 		return 0;
225 	}
226 
227 	return -EINVAL;
228 }
229 
230 
231 /**
232  * hidinput_calc_abs_res - calculate an absolute axis resolution
233  * @field: the HID report field to calculate resolution for
234  * @code: axis code
235  *
236  * The formula is:
237  *                         (logical_maximum - logical_minimum)
238  * resolution = ----------------------------------------------------------
239  *              (physical_maximum - physical_minimum) * 10 ^ unit_exponent
240  *
241  * as seen in the HID specification v1.11 6.2.2.7 Global Items.
242  *
243  * Only exponent 1 length units are processed. Centimeters and inches are
244  * converted to millimeters. Degrees are converted to radians.
245  */
hidinput_calc_abs_res(const struct hid_field * field,__u16 code)246 __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
247 {
248 	__s32 unit_exponent = field->unit_exponent;
249 	__s32 logical_extents = field->logical_maximum -
250 					field->logical_minimum;
251 	__s32 physical_extents = field->physical_maximum -
252 					field->physical_minimum;
253 	__s32 prev;
254 
255 	/* Check if the extents are sane */
256 	if (logical_extents <= 0 || physical_extents <= 0)
257 		return 0;
258 
259 	/*
260 	 * Verify and convert units.
261 	 * See HID specification v1.11 6.2.2.7 Global Items for unit decoding
262 	 */
263 	switch (code) {
264 	case ABS_X:
265 	case ABS_Y:
266 	case ABS_Z:
267 	case ABS_MT_POSITION_X:
268 	case ABS_MT_POSITION_Y:
269 	case ABS_MT_TOOL_X:
270 	case ABS_MT_TOOL_Y:
271 	case ABS_MT_TOUCH_MAJOR:
272 	case ABS_MT_TOUCH_MINOR:
273 		if (field->unit == 0x11) {		/* If centimeters */
274 			/* Convert to millimeters */
275 			unit_exponent += 1;
276 		} else if (field->unit == 0x13) {	/* If inches */
277 			/* Convert to millimeters */
278 			prev = physical_extents;
279 			physical_extents *= 254;
280 			if (physical_extents < prev)
281 				return 0;
282 			unit_exponent -= 1;
283 		} else {
284 			return 0;
285 		}
286 		break;
287 
288 	case ABS_RX:
289 	case ABS_RY:
290 	case ABS_RZ:
291 	case ABS_WHEEL:
292 	case ABS_TILT_X:
293 	case ABS_TILT_Y:
294 		if (field->unit == 0x14) {		/* If degrees */
295 			/* Convert to radians */
296 			prev = logical_extents;
297 			logical_extents *= 573;
298 			if (logical_extents < prev)
299 				return 0;
300 			unit_exponent += 1;
301 		} else if (field->unit != 0x12) {	/* If not radians */
302 			return 0;
303 		}
304 		break;
305 
306 	default:
307 		return 0;
308 	}
309 
310 	/* Apply negative unit exponent */
311 	for (; unit_exponent < 0; unit_exponent++) {
312 		prev = logical_extents;
313 		logical_extents *= 10;
314 		if (logical_extents < prev)
315 			return 0;
316 	}
317 	/* Apply positive unit exponent */
318 	for (; unit_exponent > 0; unit_exponent--) {
319 		prev = physical_extents;
320 		physical_extents *= 10;
321 		if (physical_extents < prev)
322 			return 0;
323 	}
324 
325 	/* Calculate resolution */
326 	return DIV_ROUND_CLOSEST(logical_extents, physical_extents);
327 }
328 EXPORT_SYMBOL_GPL(hidinput_calc_abs_res);
329 
330 #ifdef CONFIG_HID_BATTERY_STRENGTH
331 static enum power_supply_property hidinput_battery_props[] = {
332 	POWER_SUPPLY_PROP_PRESENT,
333 	POWER_SUPPLY_PROP_ONLINE,
334 	POWER_SUPPLY_PROP_CAPACITY,
335 	POWER_SUPPLY_PROP_MODEL_NAME,
336 	POWER_SUPPLY_PROP_STATUS,
337 	POWER_SUPPLY_PROP_SCOPE,
338 };
339 
340 #define HID_BATTERY_QUIRK_PERCENT	(1 << 0) /* always reports percent */
341 #define HID_BATTERY_QUIRK_FEATURE	(1 << 1) /* ask for feature report */
342 #define HID_BATTERY_QUIRK_IGNORE	(1 << 2) /* completely ignore the battery */
343 #define HID_BATTERY_QUIRK_AVOID_QUERY	(1 << 3) /* do not query the battery */
344 
345 static const struct hid_device_id hid_battery_quirks[] = {
346 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
347 		USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO),
348 	  HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
349 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
350 		USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ANSI),
351 	  HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
352 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
353 		USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI),
354 	  HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
355 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
356 			       USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ISO),
357 	  HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
358 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
359 		USB_DEVICE_ID_APPLE_ALU_WIRELESS_ANSI),
360 	  HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
361 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM,
362 		USB_DEVICE_ID_ELECOM_BM084),
363 	  HID_BATTERY_QUIRK_IGNORE },
364 	{ HID_USB_DEVICE(USB_VENDOR_ID_SYMBOL,
365 		USB_DEVICE_ID_SYMBOL_SCANNER_3),
366 	  HID_BATTERY_QUIRK_IGNORE },
367 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ASUSTEK,
368 		USB_DEVICE_ID_ASUSTEK_T100CHI_KEYBOARD),
369 	  HID_BATTERY_QUIRK_IGNORE },
370 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH,
371 		USB_DEVICE_ID_LOGITECH_DINOVO_EDGE_KBD),
372 	  HID_BATTERY_QUIRK_IGNORE },
373 	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN),
374 	  HID_BATTERY_QUIRK_IGNORE },
375 	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN),
376 	  HID_BATTERY_QUIRK_IGNORE },
377 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE, USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L),
378 	  HID_BATTERY_QUIRK_AVOID_QUERY },
379 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15),
380 	  HID_BATTERY_QUIRK_IGNORE },
381 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15T_DR100),
382 	  HID_BATTERY_QUIRK_IGNORE },
383 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_EU0009NV),
384 	  HID_BATTERY_QUIRK_IGNORE },
385 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_15),
386 	  HID_BATTERY_QUIRK_IGNORE },
387 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN),
388 	  HID_BATTERY_QUIRK_IGNORE },
389 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO2_TOUCHSCREEN),
390 	  HID_BATTERY_QUIRK_IGNORE },
391 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_LENOVO_YOGA_C630_TOUCHSCREEN),
392 	  HID_BATTERY_QUIRK_IGNORE },
393 	{}
394 };
395 
find_battery_quirk(struct hid_device * hdev)396 static unsigned find_battery_quirk(struct hid_device *hdev)
397 {
398 	unsigned quirks = 0;
399 	const struct hid_device_id *match;
400 
401 	match = hid_match_id(hdev, hid_battery_quirks);
402 	if (match != NULL)
403 		quirks = match->driver_data;
404 
405 	return quirks;
406 }
407 
hidinput_scale_battery_capacity(struct hid_device * dev,int value)408 static int hidinput_scale_battery_capacity(struct hid_device *dev,
409 					   int value)
410 {
411 	if (dev->battery_min < dev->battery_max &&
412 	    value >= dev->battery_min && value <= dev->battery_max)
413 		value = ((value - dev->battery_min) * 100) /
414 			(dev->battery_max - dev->battery_min);
415 
416 	return value;
417 }
418 
hidinput_query_battery_capacity(struct hid_device * dev)419 static int hidinput_query_battery_capacity(struct hid_device *dev)
420 {
421 	u8 *buf;
422 	int ret;
423 
424 	buf = kmalloc(4, GFP_KERNEL);
425 	if (!buf)
426 		return -ENOMEM;
427 
428 	ret = hid_hw_raw_request(dev, dev->battery_report_id, buf, 4,
429 				 dev->battery_report_type, HID_REQ_GET_REPORT);
430 	if (ret < 2) {
431 		kfree(buf);
432 		return -ENODATA;
433 	}
434 
435 	ret = hidinput_scale_battery_capacity(dev, buf[1]);
436 	kfree(buf);
437 	return ret;
438 }
439 
hidinput_get_battery_property(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)440 static int hidinput_get_battery_property(struct power_supply *psy,
441 					 enum power_supply_property prop,
442 					 union power_supply_propval *val)
443 {
444 	struct hid_device *dev = power_supply_get_drvdata(psy);
445 	int value;
446 	int ret = 0;
447 
448 	switch (prop) {
449 	case POWER_SUPPLY_PROP_PRESENT:
450 	case POWER_SUPPLY_PROP_ONLINE:
451 		val->intval = 1;
452 		break;
453 
454 	case POWER_SUPPLY_PROP_CAPACITY:
455 		if (dev->battery_status != HID_BATTERY_REPORTED &&
456 		    !dev->battery_avoid_query) {
457 			value = hidinput_query_battery_capacity(dev);
458 			if (value < 0)
459 				return value;
460 		} else  {
461 			value = dev->battery_capacity;
462 		}
463 
464 		val->intval = value;
465 		break;
466 
467 	case POWER_SUPPLY_PROP_MODEL_NAME:
468 		val->strval = dev->name;
469 		break;
470 
471 	case POWER_SUPPLY_PROP_STATUS:
472 		if (dev->battery_status != HID_BATTERY_REPORTED &&
473 		    !dev->battery_avoid_query) {
474 			value = hidinput_query_battery_capacity(dev);
475 			if (value < 0)
476 				return value;
477 
478 			dev->battery_capacity = value;
479 			dev->battery_status = HID_BATTERY_QUERIED;
480 		}
481 
482 		if (dev->battery_status == HID_BATTERY_UNKNOWN)
483 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
484 		else
485 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
486 		break;
487 
488 	case POWER_SUPPLY_PROP_SCOPE:
489 		val->intval = POWER_SUPPLY_SCOPE_DEVICE;
490 		break;
491 
492 	default:
493 		ret = -EINVAL;
494 		break;
495 	}
496 
497 	return ret;
498 }
499 
hidinput_setup_battery(struct hid_device * dev,unsigned report_type,struct hid_field * field,bool is_percentage)500 static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
501 				  struct hid_field *field, bool is_percentage)
502 {
503 	struct power_supply_desc *psy_desc;
504 	struct power_supply_config psy_cfg = { .drv_data = dev, };
505 	unsigned quirks;
506 	s32 min, max;
507 	int error;
508 
509 	if (dev->battery)
510 		return 0;	/* already initialized? */
511 
512 	quirks = find_battery_quirk(dev);
513 
514 	hid_dbg(dev, "device %x:%x:%x %d quirks %d\n",
515 		dev->bus, dev->vendor, dev->product, dev->version, quirks);
516 
517 	if (quirks & HID_BATTERY_QUIRK_IGNORE)
518 		return 0;
519 
520 	psy_desc = kzalloc(sizeof(*psy_desc), GFP_KERNEL);
521 	if (!psy_desc)
522 		return -ENOMEM;
523 
524 	psy_desc->name = kasprintf(GFP_KERNEL, "hid-%s-battery",
525 				   strlen(dev->uniq) ?
526 					dev->uniq : dev_name(&dev->dev));
527 	if (!psy_desc->name) {
528 		error = -ENOMEM;
529 		goto err_free_mem;
530 	}
531 
532 	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
533 	psy_desc->properties = hidinput_battery_props;
534 	psy_desc->num_properties = ARRAY_SIZE(hidinput_battery_props);
535 	psy_desc->use_for_apm = 0;
536 	psy_desc->get_property = hidinput_get_battery_property;
537 
538 	min = field->logical_minimum;
539 	max = field->logical_maximum;
540 
541 	if (is_percentage || (quirks & HID_BATTERY_QUIRK_PERCENT)) {
542 		min = 0;
543 		max = 100;
544 	}
545 
546 	if (quirks & HID_BATTERY_QUIRK_FEATURE)
547 		report_type = HID_FEATURE_REPORT;
548 
549 	dev->battery_min = min;
550 	dev->battery_max = max;
551 	dev->battery_report_type = report_type;
552 	dev->battery_report_id = field->report->id;
553 
554 	/*
555 	 * Stylus is normally not connected to the device and thus we
556 	 * can't query the device and get meaningful battery strength.
557 	 * We have to wait for the device to report it on its own.
558 	 */
559 	dev->battery_avoid_query = report_type == HID_INPUT_REPORT &&
560 				   field->physical == HID_DG_STYLUS;
561 
562 	if (quirks & HID_BATTERY_QUIRK_AVOID_QUERY)
563 		dev->battery_avoid_query = true;
564 
565 	dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
566 	if (IS_ERR(dev->battery)) {
567 		error = PTR_ERR(dev->battery);
568 		hid_warn(dev, "can't register power supply: %d\n", error);
569 		goto err_free_name;
570 	}
571 
572 	power_supply_powers(dev->battery, &dev->dev);
573 	return 0;
574 
575 err_free_name:
576 	kfree(psy_desc->name);
577 err_free_mem:
578 	kfree(psy_desc);
579 	dev->battery = NULL;
580 	return error;
581 }
582 
hidinput_cleanup_battery(struct hid_device * dev)583 static void hidinput_cleanup_battery(struct hid_device *dev)
584 {
585 	const struct power_supply_desc *psy_desc;
586 
587 	if (!dev->battery)
588 		return;
589 
590 	psy_desc = dev->battery->desc;
591 	power_supply_unregister(dev->battery);
592 	kfree(psy_desc->name);
593 	kfree(psy_desc);
594 	dev->battery = NULL;
595 }
596 
hidinput_update_battery(struct hid_device * dev,int value)597 static void hidinput_update_battery(struct hid_device *dev, int value)
598 {
599 	int capacity;
600 
601 	if (!dev->battery)
602 		return;
603 
604 	if (value == 0 || value < dev->battery_min || value > dev->battery_max)
605 		return;
606 
607 	capacity = hidinput_scale_battery_capacity(dev, value);
608 
609 	if (dev->battery_status != HID_BATTERY_REPORTED ||
610 	    capacity != dev->battery_capacity ||
611 	    ktime_after(ktime_get_coarse(), dev->battery_ratelimit_time)) {
612 		dev->battery_capacity = capacity;
613 		dev->battery_status = HID_BATTERY_REPORTED;
614 		dev->battery_ratelimit_time =
615 			ktime_add_ms(ktime_get_coarse(), 30 * 1000);
616 		power_supply_changed(dev->battery);
617 	}
618 }
619 #else  /* !CONFIG_HID_BATTERY_STRENGTH */
hidinput_setup_battery(struct hid_device * dev,unsigned report_type,struct hid_field * field,bool is_percentage)620 static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
621 				  struct hid_field *field, bool is_percentage)
622 {
623 	return 0;
624 }
625 
hidinput_cleanup_battery(struct hid_device * dev)626 static void hidinput_cleanup_battery(struct hid_device *dev)
627 {
628 }
629 
hidinput_update_battery(struct hid_device * dev,int value)630 static void hidinput_update_battery(struct hid_device *dev, int value)
631 {
632 }
633 #endif	/* CONFIG_HID_BATTERY_STRENGTH */
634 
hidinput_field_in_collection(struct hid_device * device,struct hid_field * field,unsigned int type,unsigned int usage)635 static bool hidinput_field_in_collection(struct hid_device *device, struct hid_field *field,
636 					 unsigned int type, unsigned int usage)
637 {
638 	struct hid_collection *collection;
639 
640 	collection = &device->collection[field->usage->collection_index];
641 
642 	return collection->type == type && collection->usage == usage;
643 }
644 
hidinput_configure_usage(struct hid_input * hidinput,struct hid_field * field,struct hid_usage * usage,unsigned int usage_index)645 static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_field *field,
646 				     struct hid_usage *usage, unsigned int usage_index)
647 {
648 	struct input_dev *input = hidinput->input;
649 	struct hid_device *device = input_get_drvdata(input);
650 	const struct usage_priority *usage_priority = NULL;
651 	int max = 0, code;
652 	unsigned int i = 0;
653 	unsigned long *bit = NULL;
654 
655 	field->hidinput = hidinput;
656 
657 	if (field->flags & HID_MAIN_ITEM_CONSTANT)
658 		goto ignore;
659 
660 	/* Ignore if report count is out of bounds. */
661 	if (field->report_count < 1)
662 		goto ignore;
663 
664 	/* only LED usages are supported in output fields */
665 	if (field->report_type == HID_OUTPUT_REPORT &&
666 			(usage->hid & HID_USAGE_PAGE) != HID_UP_LED) {
667 		goto ignore;
668 	}
669 
670 	/* assign a priority based on the static list declared here */
671 	for (i = 0; i < ARRAY_SIZE(hidinput_usages_priorities); i++) {
672 		if (usage->hid == hidinput_usages_priorities[i].usage) {
673 			usage_priority = &hidinput_usages_priorities[i];
674 
675 			field->usages_priorities[usage_index] =
676 				(ARRAY_SIZE(hidinput_usages_priorities) - i) << 8;
677 			break;
678 		}
679 	}
680 
681 	/*
682 	 * For slotted devices, we need to also add the slot index
683 	 * in the priority.
684 	 */
685 	if (usage_priority && usage_priority->global)
686 		field->usages_priorities[usage_index] |=
687 			usage_priority->slot_overwrite;
688 	else
689 		field->usages_priorities[usage_index] |=
690 			(0xff - field->slot_idx) << 16;
691 
692 	if (device->driver->input_mapping) {
693 		int ret = device->driver->input_mapping(device, hidinput, field,
694 				usage, &bit, &max);
695 		if (ret > 0)
696 			goto mapped;
697 		if (ret < 0)
698 			goto ignore;
699 	}
700 
701 	switch (usage->hid & HID_USAGE_PAGE) {
702 	case HID_UP_UNDEFINED:
703 		goto ignore;
704 
705 	case HID_UP_KEYBOARD:
706 		set_bit(EV_REP, input->evbit);
707 
708 		if ((usage->hid & HID_USAGE) < 256) {
709 			if (!hid_keyboard[usage->hid & HID_USAGE]) goto ignore;
710 			map_key_clear(hid_keyboard[usage->hid & HID_USAGE]);
711 		} else
712 			map_key(KEY_UNKNOWN);
713 
714 		break;
715 
716 	case HID_UP_BUTTON:
717 		code = ((usage->hid - 1) & HID_USAGE);
718 
719 		switch (field->application) {
720 		case HID_GD_MOUSE:
721 		case HID_GD_POINTER:  code += BTN_MOUSE; break;
722 		case HID_GD_JOYSTICK:
723 				if (code <= 0xf)
724 					code += BTN_JOYSTICK;
725 				else
726 					code += BTN_TRIGGER_HAPPY - 0x10;
727 				break;
728 		case HID_GD_GAMEPAD:
729 				if (code <= 0xf)
730 					code += BTN_GAMEPAD;
731 				else
732 					code += BTN_TRIGGER_HAPPY - 0x10;
733 				break;
734 		case HID_CP_CONSUMER_CONTROL:
735 				if (hidinput_field_in_collection(device, field,
736 								 HID_COLLECTION_NAMED_ARRAY,
737 								 HID_CP_PROGRAMMABLEBUTTONS)) {
738 					if (code <= 0x1d)
739 						code += KEY_MACRO1;
740 					else
741 						code += BTN_TRIGGER_HAPPY - 0x1e;
742 					break;
743 				}
744 				fallthrough;
745 		default:
746 			switch (field->physical) {
747 			case HID_GD_MOUSE:
748 			case HID_GD_POINTER:  code += BTN_MOUSE; break;
749 			case HID_GD_JOYSTICK: code += BTN_JOYSTICK; break;
750 			case HID_GD_GAMEPAD:  code += BTN_GAMEPAD; break;
751 			default:              code += BTN_MISC;
752 			}
753 		}
754 
755 		map_key(code);
756 		break;
757 
758 	case HID_UP_SIMULATION:
759 		switch (usage->hid & 0xffff) {
760 		case 0xba: map_abs(ABS_RUDDER);   break;
761 		case 0xbb: map_abs(ABS_THROTTLE); break;
762 		case 0xc4: map_abs(ABS_GAS);      break;
763 		case 0xc5: map_abs(ABS_BRAKE);    break;
764 		case 0xc8: map_abs(ABS_WHEEL);    break;
765 		default:   goto ignore;
766 		}
767 		break;
768 
769 	case HID_UP_GENDESK:
770 		if ((usage->hid & 0xf0) == 0x80) {	/* SystemControl */
771 			switch (usage->hid & 0xf) {
772 			case 0x1: map_key_clear(KEY_POWER);  break;
773 			case 0x2: map_key_clear(KEY_SLEEP);  break;
774 			case 0x3: map_key_clear(KEY_WAKEUP); break;
775 			case 0x4: map_key_clear(KEY_CONTEXT_MENU); break;
776 			case 0x5: map_key_clear(KEY_MENU); break;
777 			case 0x6: map_key_clear(KEY_PROG1); break;
778 			case 0x7: map_key_clear(KEY_HELP); break;
779 			case 0x8: map_key_clear(KEY_EXIT); break;
780 			case 0x9: map_key_clear(KEY_SELECT); break;
781 			case 0xa: map_key_clear(KEY_RIGHT); break;
782 			case 0xb: map_key_clear(KEY_LEFT); break;
783 			case 0xc: map_key_clear(KEY_UP); break;
784 			case 0xd: map_key_clear(KEY_DOWN); break;
785 			case 0xe: map_key_clear(KEY_POWER2); break;
786 			case 0xf: map_key_clear(KEY_RESTART); break;
787 			default: goto unknown;
788 			}
789 			break;
790 		}
791 
792 		if ((usage->hid & 0xf0) == 0xb0) {	/* SC - Display */
793 			switch (usage->hid & 0xf) {
794 			case 0x05: map_key_clear(KEY_SWITCHVIDEOMODE); break;
795 			default: goto ignore;
796 			}
797 			break;
798 		}
799 
800 		/*
801 		 * Some lazy vendors declare 255 usages for System Control,
802 		 * leading to the creation of ABS_X|Y axis and too many others.
803 		 * It wouldn't be a problem if joydev doesn't consider the
804 		 * device as a joystick then.
805 		 */
806 		if (field->application == HID_GD_SYSTEM_CONTROL)
807 			goto ignore;
808 
809 		if ((usage->hid & 0xf0) == 0x90) {	/* D-pad */
810 			switch (usage->hid) {
811 			case HID_GD_UP:	   usage->hat_dir = 1; break;
812 			case HID_GD_DOWN:  usage->hat_dir = 5; break;
813 			case HID_GD_RIGHT: usage->hat_dir = 3; break;
814 			case HID_GD_LEFT:  usage->hat_dir = 7; break;
815 			default: goto unknown;
816 			}
817 			if (field->dpad) {
818 				map_abs(field->dpad);
819 				goto ignore;
820 			}
821 			map_abs(ABS_HAT0X);
822 			break;
823 		}
824 
825 		switch (usage->hid) {
826 		/* These usage IDs map directly to the usage codes. */
827 		case HID_GD_X: case HID_GD_Y: case HID_GD_Z:
828 		case HID_GD_RX: case HID_GD_RY: case HID_GD_RZ:
829 			if (field->flags & HID_MAIN_ITEM_RELATIVE)
830 				map_rel(usage->hid & 0xf);
831 			else
832 				map_abs_clear(usage->hid & 0xf);
833 			break;
834 
835 		case HID_GD_WHEEL:
836 			if (field->flags & HID_MAIN_ITEM_RELATIVE) {
837 				set_bit(REL_WHEEL, input->relbit);
838 				map_rel(REL_WHEEL_HI_RES);
839 			} else {
840 				map_abs(usage->hid & 0xf);
841 			}
842 			break;
843 		case HID_GD_SLIDER: case HID_GD_DIAL:
844 			if (field->flags & HID_MAIN_ITEM_RELATIVE)
845 				map_rel(usage->hid & 0xf);
846 			else
847 				map_abs(usage->hid & 0xf);
848 			break;
849 
850 		case HID_GD_HATSWITCH:
851 			usage->hat_min = field->logical_minimum;
852 			usage->hat_max = field->logical_maximum;
853 			map_abs(ABS_HAT0X);
854 			break;
855 
856 		case HID_GD_START:	map_key_clear(BTN_START);	break;
857 		case HID_GD_SELECT:	map_key_clear(BTN_SELECT);	break;
858 
859 		case HID_GD_RFKILL_BTN:
860 			/* MS wireless radio ctl extension, also check CA */
861 			if (field->application == HID_GD_WIRELESS_RADIO_CTLS) {
862 				map_key_clear(KEY_RFKILL);
863 				/* We need to simulate the btn release */
864 				field->flags |= HID_MAIN_ITEM_RELATIVE;
865 				break;
866 			}
867 			goto unknown;
868 
869 		default: goto unknown;
870 		}
871 
872 		break;
873 
874 	case HID_UP_LED:
875 		switch (usage->hid & 0xffff) {		      /* HID-Value:                   */
876 		case 0x01:  map_led (LED_NUML);     break;    /*   "Num Lock"                 */
877 		case 0x02:  map_led (LED_CAPSL);    break;    /*   "Caps Lock"                */
878 		case 0x03:  map_led (LED_SCROLLL);  break;    /*   "Scroll Lock"              */
879 		case 0x04:  map_led (LED_COMPOSE);  break;    /*   "Compose"                  */
880 		case 0x05:  map_led (LED_KANA);     break;    /*   "Kana"                     */
881 		case 0x27:  map_led (LED_SLEEP);    break;    /*   "Stand-By"                 */
882 		case 0x4c:  map_led (LED_SUSPEND);  break;    /*   "System Suspend"           */
883 		case 0x09:  map_led (LED_MUTE);     break;    /*   "Mute"                     */
884 		case 0x4b:  map_led (LED_MISC);     break;    /*   "Generic Indicator"        */
885 		case 0x19:  map_led (LED_MAIL);     break;    /*   "Message Waiting"          */
886 		case 0x4d:  map_led (LED_CHARGING); break;    /*   "External Power Connected" */
887 
888 		default: goto ignore;
889 		}
890 		break;
891 
892 	case HID_UP_DIGITIZER:
893 		if ((field->application & 0xff) == 0x01) /* Digitizer */
894 			__set_bit(INPUT_PROP_POINTER, input->propbit);
895 		else if ((field->application & 0xff) == 0x02) /* Pen */
896 			__set_bit(INPUT_PROP_DIRECT, input->propbit);
897 
898 		switch (usage->hid & 0xff) {
899 		case 0x00: /* Undefined */
900 			goto ignore;
901 
902 		case 0x30: /* TipPressure */
903 			if (!test_bit(BTN_TOUCH, input->keybit)) {
904 				device->quirks |= HID_QUIRK_NOTOUCH;
905 				set_bit(EV_KEY, input->evbit);
906 				set_bit(BTN_TOUCH, input->keybit);
907 			}
908 			map_abs_clear(ABS_PRESSURE);
909 			break;
910 
911 		case 0x32: /* InRange */
912 			switch (field->physical) {
913 			case HID_DG_PUCK:
914 				map_key(BTN_TOOL_MOUSE);
915 				break;
916 			case HID_DG_FINGER:
917 				map_key(BTN_TOOL_FINGER);
918 				break;
919 			default:
920 				/*
921 				 * If the physical is not given,
922 				 * rely on the application.
923 				 */
924 				if (!field->physical) {
925 					switch (field->application) {
926 					case HID_DG_TOUCHSCREEN:
927 					case HID_DG_TOUCHPAD:
928 						map_key_clear(BTN_TOOL_FINGER);
929 						break;
930 					default:
931 						map_key_clear(BTN_TOOL_PEN);
932 					}
933 				} else {
934 					map_key(BTN_TOOL_PEN);
935 				}
936 				break;
937 			}
938 			break;
939 
940 		case 0x3b: /* Battery Strength */
941 			hidinput_setup_battery(device, HID_INPUT_REPORT, field, false);
942 			usage->type = EV_PWR;
943 			return;
944 
945 		case 0x3c: /* Invert */
946 			map_key_clear(BTN_TOOL_RUBBER);
947 			break;
948 
949 		case 0x3d: /* X Tilt */
950 			map_abs_clear(ABS_TILT_X);
951 			break;
952 
953 		case 0x3e: /* Y Tilt */
954 			map_abs_clear(ABS_TILT_Y);
955 			break;
956 
957 		case 0x33: /* Touch */
958 		case 0x42: /* TipSwitch */
959 		case 0x43: /* TipSwitch2 */
960 			device->quirks &= ~HID_QUIRK_NOTOUCH;
961 			map_key_clear(BTN_TOUCH);
962 			break;
963 
964 		case 0x44: /* BarrelSwitch */
965 			map_key_clear(BTN_STYLUS);
966 			break;
967 
968 		case 0x45: /* ERASER */
969 			/*
970 			 * This event is reported when eraser tip touches the surface.
971 			 * Actual eraser (BTN_TOOL_RUBBER) is set by Invert usage when
972 			 * tool gets in proximity.
973 			 */
974 			map_key_clear(BTN_TOUCH);
975 			break;
976 
977 		case 0x46: /* TabletPick */
978 		case 0x5a: /* SecondaryBarrelSwitch */
979 			map_key_clear(BTN_STYLUS2);
980 			break;
981 
982 		case 0x5b: /* TransducerSerialNumber */
983 		case 0x6e: /* TransducerSerialNumber2 */
984 			map_msc(MSC_SERIAL);
985 			break;
986 
987 		default:  goto unknown;
988 		}
989 		break;
990 
991 	case HID_UP_TELEPHONY:
992 		switch (usage->hid & HID_USAGE) {
993 		case 0x2f: map_key_clear(KEY_MICMUTE);		break;
994 		case 0xb0: map_key_clear(KEY_NUMERIC_0);	break;
995 		case 0xb1: map_key_clear(KEY_NUMERIC_1);	break;
996 		case 0xb2: map_key_clear(KEY_NUMERIC_2);	break;
997 		case 0xb3: map_key_clear(KEY_NUMERIC_3);	break;
998 		case 0xb4: map_key_clear(KEY_NUMERIC_4);	break;
999 		case 0xb5: map_key_clear(KEY_NUMERIC_5);	break;
1000 		case 0xb6: map_key_clear(KEY_NUMERIC_6);	break;
1001 		case 0xb7: map_key_clear(KEY_NUMERIC_7);	break;
1002 		case 0xb8: map_key_clear(KEY_NUMERIC_8);	break;
1003 		case 0xb9: map_key_clear(KEY_NUMERIC_9);	break;
1004 		case 0xba: map_key_clear(KEY_NUMERIC_STAR);	break;
1005 		case 0xbb: map_key_clear(KEY_NUMERIC_POUND);	break;
1006 		case 0xbc: map_key_clear(KEY_NUMERIC_A);	break;
1007 		case 0xbd: map_key_clear(KEY_NUMERIC_B);	break;
1008 		case 0xbe: map_key_clear(KEY_NUMERIC_C);	break;
1009 		case 0xbf: map_key_clear(KEY_NUMERIC_D);	break;
1010 		default: goto ignore;
1011 		}
1012 		break;
1013 
1014 	case HID_UP_CONSUMER:	/* USB HUT v1.12, pages 75-84 */
1015 		switch (usage->hid & HID_USAGE) {
1016 		case 0x000: goto ignore;
1017 		case 0x030: map_key_clear(KEY_POWER);		break;
1018 		case 0x031: map_key_clear(KEY_RESTART);		break;
1019 		case 0x032: map_key_clear(KEY_SLEEP);		break;
1020 		case 0x034: map_key_clear(KEY_SLEEP);		break;
1021 		case 0x035: map_key_clear(KEY_KBDILLUMTOGGLE);	break;
1022 		case 0x036: map_key_clear(BTN_MISC);		break;
1023 
1024 		case 0x040: map_key_clear(KEY_MENU);		break; /* Menu */
1025 		case 0x041: map_key_clear(KEY_SELECT);		break; /* Menu Pick */
1026 		case 0x042: map_key_clear(KEY_UP);		break; /* Menu Up */
1027 		case 0x043: map_key_clear(KEY_DOWN);		break; /* Menu Down */
1028 		case 0x044: map_key_clear(KEY_LEFT);		break; /* Menu Left */
1029 		case 0x045: map_key_clear(KEY_RIGHT);		break; /* Menu Right */
1030 		case 0x046: map_key_clear(KEY_ESC);		break; /* Menu Escape */
1031 		case 0x047: map_key_clear(KEY_KPPLUS);		break; /* Menu Value Increase */
1032 		case 0x048: map_key_clear(KEY_KPMINUS);		break; /* Menu Value Decrease */
1033 
1034 		case 0x060: map_key_clear(KEY_INFO);		break; /* Data On Screen */
1035 		case 0x061: map_key_clear(KEY_SUBTITLE);	break; /* Closed Caption */
1036 		case 0x063: map_key_clear(KEY_VCR);		break; /* VCR/TV */
1037 		case 0x065: map_key_clear(KEY_CAMERA);		break; /* Snapshot */
1038 		case 0x069: map_key_clear(KEY_RED);		break;
1039 		case 0x06a: map_key_clear(KEY_GREEN);		break;
1040 		case 0x06b: map_key_clear(KEY_BLUE);		break;
1041 		case 0x06c: map_key_clear(KEY_YELLOW);		break;
1042 		case 0x06d: map_key_clear(KEY_ASPECT_RATIO);	break;
1043 
1044 		case 0x06f: map_key_clear(KEY_BRIGHTNESSUP);		break;
1045 		case 0x070: map_key_clear(KEY_BRIGHTNESSDOWN);		break;
1046 		case 0x072: map_key_clear(KEY_BRIGHTNESS_TOGGLE);	break;
1047 		case 0x073: map_key_clear(KEY_BRIGHTNESS_MIN);		break;
1048 		case 0x074: map_key_clear(KEY_BRIGHTNESS_MAX);		break;
1049 		case 0x075: map_key_clear(KEY_BRIGHTNESS_AUTO);		break;
1050 
1051 		case 0x079: map_key_clear(KEY_KBDILLUMUP);	break;
1052 		case 0x07a: map_key_clear(KEY_KBDILLUMDOWN);	break;
1053 		case 0x07c: map_key_clear(KEY_KBDILLUMTOGGLE);	break;
1054 
1055 		case 0x082: map_key_clear(KEY_VIDEO_NEXT);	break;
1056 		case 0x083: map_key_clear(KEY_LAST);		break;
1057 		case 0x084: map_key_clear(KEY_ENTER);		break;
1058 		case 0x088: map_key_clear(KEY_PC);		break;
1059 		case 0x089: map_key_clear(KEY_TV);		break;
1060 		case 0x08a: map_key_clear(KEY_WWW);		break;
1061 		case 0x08b: map_key_clear(KEY_DVD);		break;
1062 		case 0x08c: map_key_clear(KEY_PHONE);		break;
1063 		case 0x08d: map_key_clear(KEY_PROGRAM);		break;
1064 		case 0x08e: map_key_clear(KEY_VIDEOPHONE);	break;
1065 		case 0x08f: map_key_clear(KEY_GAMES);		break;
1066 		case 0x090: map_key_clear(KEY_MEMO);		break;
1067 		case 0x091: map_key_clear(KEY_CD);		break;
1068 		case 0x092: map_key_clear(KEY_VCR);		break;
1069 		case 0x093: map_key_clear(KEY_TUNER);		break;
1070 		case 0x094: map_key_clear(KEY_EXIT);		break;
1071 		case 0x095: map_key_clear(KEY_HELP);		break;
1072 		case 0x096: map_key_clear(KEY_TAPE);		break;
1073 		case 0x097: map_key_clear(KEY_TV2);		break;
1074 		case 0x098: map_key_clear(KEY_SAT);		break;
1075 		case 0x09a: map_key_clear(KEY_PVR);		break;
1076 
1077 		case 0x09c: map_key_clear(KEY_CHANNELUP);	break;
1078 		case 0x09d: map_key_clear(KEY_CHANNELDOWN);	break;
1079 		case 0x0a0: map_key_clear(KEY_VCR2);		break;
1080 
1081 		case 0x0b0: map_key_clear(KEY_PLAY);		break;
1082 		case 0x0b1: map_key_clear(KEY_PAUSE);		break;
1083 		case 0x0b2: map_key_clear(KEY_RECORD);		break;
1084 		case 0x0b3: map_key_clear(KEY_FASTFORWARD);	break;
1085 		case 0x0b4: map_key_clear(KEY_REWIND);		break;
1086 		case 0x0b5: map_key_clear(KEY_NEXTSONG);	break;
1087 		case 0x0b6: map_key_clear(KEY_PREVIOUSSONG);	break;
1088 		case 0x0b7: map_key_clear(KEY_STOPCD);		break;
1089 		case 0x0b8: map_key_clear(KEY_EJECTCD);		break;
1090 		case 0x0bc: map_key_clear(KEY_MEDIA_REPEAT);	break;
1091 		case 0x0b9: map_key_clear(KEY_SHUFFLE);		break;
1092 		case 0x0bf: map_key_clear(KEY_SLOW);		break;
1093 
1094 		case 0x0cd: map_key_clear(KEY_PLAYPAUSE);	break;
1095 		case 0x0cf: map_key_clear(KEY_VOICECOMMAND);	break;
1096 
1097 		case 0x0d8: map_key_clear(KEY_DICTATE);		break;
1098 		case 0x0d9: map_key_clear(KEY_EMOJI_PICKER);	break;
1099 
1100 		case 0x0e0: map_abs_clear(ABS_VOLUME);		break;
1101 		case 0x0e2: map_key_clear(KEY_MUTE);		break;
1102 		case 0x0e5: map_key_clear(KEY_BASSBOOST);	break;
1103 		case 0x0e9: map_key_clear(KEY_VOLUMEUP);	break;
1104 		case 0x0ea: map_key_clear(KEY_VOLUMEDOWN);	break;
1105 		case 0x0f5: map_key_clear(KEY_SLOW);		break;
1106 
1107 		case 0x181: map_key_clear(KEY_BUTTONCONFIG);	break;
1108 		case 0x182: map_key_clear(KEY_BOOKMARKS);	break;
1109 		case 0x183: map_key_clear(KEY_CONFIG);		break;
1110 		case 0x184: map_key_clear(KEY_WORDPROCESSOR);	break;
1111 		case 0x185: map_key_clear(KEY_EDITOR);		break;
1112 		case 0x186: map_key_clear(KEY_SPREADSHEET);	break;
1113 		case 0x187: map_key_clear(KEY_GRAPHICSEDITOR);	break;
1114 		case 0x188: map_key_clear(KEY_PRESENTATION);	break;
1115 		case 0x189: map_key_clear(KEY_DATABASE);	break;
1116 		case 0x18a: map_key_clear(KEY_MAIL);		break;
1117 		case 0x18b: map_key_clear(KEY_NEWS);		break;
1118 		case 0x18c: map_key_clear(KEY_VOICEMAIL);	break;
1119 		case 0x18d: map_key_clear(KEY_ADDRESSBOOK);	break;
1120 		case 0x18e: map_key_clear(KEY_CALENDAR);	break;
1121 		case 0x18f: map_key_clear(KEY_TASKMANAGER);	break;
1122 		case 0x190: map_key_clear(KEY_JOURNAL);		break;
1123 		case 0x191: map_key_clear(KEY_FINANCE);		break;
1124 		case 0x192: map_key_clear(KEY_CALC);		break;
1125 		case 0x193: map_key_clear(KEY_PLAYER);		break;
1126 		case 0x194: map_key_clear(KEY_FILE);		break;
1127 		case 0x196: map_key_clear(KEY_WWW);		break;
1128 		case 0x199: map_key_clear(KEY_CHAT);		break;
1129 		case 0x19c: map_key_clear(KEY_LOGOFF);		break;
1130 		case 0x19e: map_key_clear(KEY_COFFEE);		break;
1131 		case 0x19f: map_key_clear(KEY_CONTROLPANEL);		break;
1132 		case 0x1a2: map_key_clear(KEY_APPSELECT);		break;
1133 		case 0x1a3: map_key_clear(KEY_NEXT);		break;
1134 		case 0x1a4: map_key_clear(KEY_PREVIOUS);	break;
1135 		case 0x1a6: map_key_clear(KEY_HELP);		break;
1136 		case 0x1a7: map_key_clear(KEY_DOCUMENTS);	break;
1137 		case 0x1ab: map_key_clear(KEY_SPELLCHECK);	break;
1138 		case 0x1ae: map_key_clear(KEY_KEYBOARD);	break;
1139 		case 0x1b1: map_key_clear(KEY_SCREENSAVER);		break;
1140 		case 0x1b4: map_key_clear(KEY_FILE);		break;
1141 		case 0x1b6: map_key_clear(KEY_IMAGES);		break;
1142 		case 0x1b7: map_key_clear(KEY_AUDIO);		break;
1143 		case 0x1b8: map_key_clear(KEY_VIDEO);		break;
1144 		case 0x1bc: map_key_clear(KEY_MESSENGER);	break;
1145 		case 0x1bd: map_key_clear(KEY_INFO);		break;
1146 		case 0x1cb: map_key_clear(KEY_ASSISTANT);	break;
1147 		case 0x201: map_key_clear(KEY_NEW);		break;
1148 		case 0x202: map_key_clear(KEY_OPEN);		break;
1149 		case 0x203: map_key_clear(KEY_CLOSE);		break;
1150 		case 0x204: map_key_clear(KEY_EXIT);		break;
1151 		case 0x207: map_key_clear(KEY_SAVE);		break;
1152 		case 0x208: map_key_clear(KEY_PRINT);		break;
1153 		case 0x209: map_key_clear(KEY_PROPS);		break;
1154 		case 0x21a: map_key_clear(KEY_UNDO);		break;
1155 		case 0x21b: map_key_clear(KEY_COPY);		break;
1156 		case 0x21c: map_key_clear(KEY_CUT);		break;
1157 		case 0x21d: map_key_clear(KEY_PASTE);		break;
1158 		case 0x21f: map_key_clear(KEY_FIND);		break;
1159 		case 0x221: map_key_clear(KEY_SEARCH);		break;
1160 		case 0x222: map_key_clear(KEY_GOTO);		break;
1161 		case 0x223: map_key_clear(KEY_HOMEPAGE);	break;
1162 		case 0x224: map_key_clear(KEY_BACK);		break;
1163 		case 0x225: map_key_clear(KEY_FORWARD);		break;
1164 		case 0x226: map_key_clear(KEY_STOP);		break;
1165 		case 0x227: map_key_clear(KEY_REFRESH);		break;
1166 		case 0x22a: map_key_clear(KEY_BOOKMARKS);	break;
1167 		case 0x22d: map_key_clear(KEY_ZOOMIN);		break;
1168 		case 0x22e: map_key_clear(KEY_ZOOMOUT);		break;
1169 		case 0x22f: map_key_clear(KEY_ZOOMRESET);	break;
1170 		case 0x232: map_key_clear(KEY_FULL_SCREEN);	break;
1171 		case 0x233: map_key_clear(KEY_SCROLLUP);	break;
1172 		case 0x234: map_key_clear(KEY_SCROLLDOWN);	break;
1173 		case 0x238: /* AC Pan */
1174 			set_bit(REL_HWHEEL, input->relbit);
1175 			map_rel(REL_HWHEEL_HI_RES);
1176 			break;
1177 		case 0x23d: map_key_clear(KEY_EDIT);		break;
1178 		case 0x25f: map_key_clear(KEY_CANCEL);		break;
1179 		case 0x269: map_key_clear(KEY_INSERT);		break;
1180 		case 0x26a: map_key_clear(KEY_DELETE);		break;
1181 		case 0x279: map_key_clear(KEY_REDO);		break;
1182 
1183 		case 0x289: map_key_clear(KEY_REPLY);		break;
1184 		case 0x28b: map_key_clear(KEY_FORWARDMAIL);	break;
1185 		case 0x28c: map_key_clear(KEY_SEND);		break;
1186 
1187 		case 0x29d: map_key_clear(KEY_KBD_LAYOUT_NEXT);	break;
1188 
1189 		case 0x2a2: map_key_clear(KEY_ALL_APPLICATIONS);	break;
1190 
1191 		case 0x2c7: map_key_clear(KEY_KBDINPUTASSIST_PREV);		break;
1192 		case 0x2c8: map_key_clear(KEY_KBDINPUTASSIST_NEXT);		break;
1193 		case 0x2c9: map_key_clear(KEY_KBDINPUTASSIST_PREVGROUP);		break;
1194 		case 0x2ca: map_key_clear(KEY_KBDINPUTASSIST_NEXTGROUP);		break;
1195 		case 0x2cb: map_key_clear(KEY_KBDINPUTASSIST_ACCEPT);	break;
1196 		case 0x2cc: map_key_clear(KEY_KBDINPUTASSIST_CANCEL);	break;
1197 
1198 		case 0x29f: map_key_clear(KEY_SCALE);		break;
1199 
1200 		default: map_key_clear(KEY_UNKNOWN);
1201 		}
1202 		break;
1203 
1204 	case HID_UP_GENDEVCTRLS:
1205 		switch (usage->hid) {
1206 		case HID_DC_BATTERYSTRENGTH:
1207 			hidinput_setup_battery(device, HID_INPUT_REPORT, field, false);
1208 			usage->type = EV_PWR;
1209 			return;
1210 		}
1211 		goto unknown;
1212 
1213 	case HID_UP_BATTERY:
1214 		switch (usage->hid) {
1215 		case HID_BAT_ABSOLUTESTATEOFCHARGE:
1216 			hidinput_setup_battery(device, HID_INPUT_REPORT, field, true);
1217 			usage->type = EV_PWR;
1218 			return;
1219 		}
1220 		goto unknown;
1221 
1222 	case HID_UP_HPVENDOR:	/* Reported on a Dutch layout HP5308 */
1223 		set_bit(EV_REP, input->evbit);
1224 		switch (usage->hid & HID_USAGE) {
1225 		case 0x021: map_key_clear(KEY_PRINT);           break;
1226 		case 0x070: map_key_clear(KEY_HP);		break;
1227 		case 0x071: map_key_clear(KEY_CAMERA);		break;
1228 		case 0x072: map_key_clear(KEY_SOUND);		break;
1229 		case 0x073: map_key_clear(KEY_QUESTION);	break;
1230 		case 0x080: map_key_clear(KEY_EMAIL);		break;
1231 		case 0x081: map_key_clear(KEY_CHAT);		break;
1232 		case 0x082: map_key_clear(KEY_SEARCH);		break;
1233 		case 0x083: map_key_clear(KEY_CONNECT);	        break;
1234 		case 0x084: map_key_clear(KEY_FINANCE);		break;
1235 		case 0x085: map_key_clear(KEY_SPORT);		break;
1236 		case 0x086: map_key_clear(KEY_SHOP);	        break;
1237 		default:    goto ignore;
1238 		}
1239 		break;
1240 
1241 	case HID_UP_HPVENDOR2:
1242 		set_bit(EV_REP, input->evbit);
1243 		switch (usage->hid & HID_USAGE) {
1244 		case 0x001: map_key_clear(KEY_MICMUTE);		break;
1245 		case 0x003: map_key_clear(KEY_BRIGHTNESSDOWN);	break;
1246 		case 0x004: map_key_clear(KEY_BRIGHTNESSUP);	break;
1247 		default:    goto ignore;
1248 		}
1249 		break;
1250 
1251 	case HID_UP_MSVENDOR:
1252 		goto ignore;
1253 
1254 	case HID_UP_CUSTOM: /* Reported on Logitech and Apple USB keyboards */
1255 		set_bit(EV_REP, input->evbit);
1256 		goto ignore;
1257 
1258 	case HID_UP_LOGIVENDOR:
1259 		/* intentional fallback */
1260 	case HID_UP_LOGIVENDOR2:
1261 		/* intentional fallback */
1262 	case HID_UP_LOGIVENDOR3:
1263 		goto ignore;
1264 
1265 	case HID_UP_PID:
1266 		switch (usage->hid & HID_USAGE) {
1267 		case 0xa4: map_key_clear(BTN_DEAD);	break;
1268 		default: goto ignore;
1269 		}
1270 		break;
1271 
1272 	default:
1273 	unknown:
1274 		if (field->report_size == 1) {
1275 			if (field->report->type == HID_OUTPUT_REPORT) {
1276 				map_led(LED_MISC);
1277 				break;
1278 			}
1279 			map_key(BTN_MISC);
1280 			break;
1281 		}
1282 		if (field->flags & HID_MAIN_ITEM_RELATIVE) {
1283 			map_rel(REL_MISC);
1284 			break;
1285 		}
1286 		map_abs(ABS_MISC);
1287 		break;
1288 	}
1289 
1290 mapped:
1291 	/* Mapping failed, bail out */
1292 	if (!bit)
1293 		return;
1294 
1295 	if (device->driver->input_mapped &&
1296 	    device->driver->input_mapped(device, hidinput, field, usage,
1297 					 &bit, &max) < 0) {
1298 		/*
1299 		 * The driver indicated that no further generic handling
1300 		 * of the usage is desired.
1301 		 */
1302 		return;
1303 	}
1304 
1305 	set_bit(usage->type, input->evbit);
1306 
1307 	/*
1308 	 * This part is *really* controversial:
1309 	 * - HID aims at being generic so we should do our best to export
1310 	 *   all incoming events
1311 	 * - HID describes what events are, so there is no reason for ABS_X
1312 	 *   to be mapped to ABS_Y
1313 	 * - HID is using *_MISC+N as a default value, but nothing prevents
1314 	 *   *_MISC+N to overwrite a legitimate even, which confuses userspace
1315 	 *   (for instance ABS_MISC + 7 is ABS_MT_SLOT, which has a different
1316 	 *   processing)
1317 	 *
1318 	 * If devices still want to use this (at their own risk), they will
1319 	 * have to use the quirk HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE, but
1320 	 * the default should be a reliable mapping.
1321 	 */
1322 	while (usage->code <= max && test_and_set_bit(usage->code, bit)) {
1323 		if (device->quirks & HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE) {
1324 			usage->code = find_next_zero_bit(bit,
1325 							 max + 1,
1326 							 usage->code);
1327 		} else {
1328 			device->status |= HID_STAT_DUP_DETECTED;
1329 			goto ignore;
1330 		}
1331 	}
1332 
1333 	if (usage->code > max)
1334 		goto ignore;
1335 
1336 	if (usage->type == EV_ABS) {
1337 
1338 		int a = field->logical_minimum;
1339 		int b = field->logical_maximum;
1340 
1341 		if ((device->quirks & HID_QUIRK_BADPAD) && (usage->code == ABS_X || usage->code == ABS_Y)) {
1342 			a = field->logical_minimum = 0;
1343 			b = field->logical_maximum = 255;
1344 		}
1345 
1346 		if (field->application == HID_GD_GAMEPAD || field->application == HID_GD_JOYSTICK)
1347 			input_set_abs_params(input, usage->code, a, b, (b - a) >> 8, (b - a) >> 4);
1348 		else	input_set_abs_params(input, usage->code, a, b, 0, 0);
1349 
1350 		input_abs_set_res(input, usage->code,
1351 				  hidinput_calc_abs_res(field, usage->code));
1352 
1353 		/* use a larger default input buffer for MT devices */
1354 		if (usage->code == ABS_MT_POSITION_X && input->hint_events_per_packet == 0)
1355 			input_set_events_per_packet(input, 60);
1356 	}
1357 
1358 	if (usage->type == EV_ABS &&
1359 	    (usage->hat_min < usage->hat_max || usage->hat_dir)) {
1360 		int i;
1361 		for (i = usage->code; i < usage->code + 2 && i <= max; i++) {
1362 			input_set_abs_params(input, i, -1, 1, 0, 0);
1363 			set_bit(i, input->absbit);
1364 		}
1365 		if (usage->hat_dir && !field->dpad)
1366 			field->dpad = usage->code;
1367 	}
1368 
1369 	/* for those devices which produce Consumer volume usage as relative,
1370 	 * we emulate pressing volumeup/volumedown appropriate number of times
1371 	 * in hidinput_hid_event()
1372 	 */
1373 	if ((usage->type == EV_ABS) && (field->flags & HID_MAIN_ITEM_RELATIVE) &&
1374 			(usage->code == ABS_VOLUME)) {
1375 		set_bit(KEY_VOLUMEUP, input->keybit);
1376 		set_bit(KEY_VOLUMEDOWN, input->keybit);
1377 	}
1378 
1379 	if (usage->type == EV_KEY) {
1380 		set_bit(EV_MSC, input->evbit);
1381 		set_bit(MSC_SCAN, input->mscbit);
1382 	}
1383 
1384 	return;
1385 
1386 ignore:
1387 	usage->type = 0;
1388 	usage->code = 0;
1389 }
1390 
hidinput_handle_scroll(struct hid_usage * usage,struct input_dev * input,__s32 value)1391 static void hidinput_handle_scroll(struct hid_usage *usage,
1392 				   struct input_dev *input,
1393 				   __s32 value)
1394 {
1395 	int code;
1396 	int hi_res, lo_res;
1397 
1398 	if (value == 0)
1399 		return;
1400 
1401 	if (usage->code == REL_WHEEL_HI_RES)
1402 		code = REL_WHEEL;
1403 	else
1404 		code = REL_HWHEEL;
1405 
1406 	/*
1407 	 * Windows reports one wheel click as value 120. Where a high-res
1408 	 * scroll wheel is present, a fraction of 120 is reported instead.
1409 	 * Our REL_WHEEL_HI_RES axis does the same because all HW must
1410 	 * adhere to the 120 expectation.
1411 	 */
1412 	hi_res = value * 120/usage->resolution_multiplier;
1413 
1414 	usage->wheel_accumulated += hi_res;
1415 	lo_res = usage->wheel_accumulated/120;
1416 	if (lo_res)
1417 		usage->wheel_accumulated -= lo_res * 120;
1418 
1419 	input_event(input, EV_REL, code, lo_res);
1420 	input_event(input, EV_REL, usage->code, hi_res);
1421 }
1422 
hid_report_release_tool(struct hid_report * report,struct input_dev * input,unsigned int tool)1423 static void hid_report_release_tool(struct hid_report *report, struct input_dev *input,
1424 				    unsigned int tool)
1425 {
1426 	/* if the given tool is not currently reported, ignore */
1427 	if (!test_bit(tool, input->key))
1428 		return;
1429 
1430 	/*
1431 	 * if the given tool was previously set, release it,
1432 	 * release any TOUCH and send an EV_SYN
1433 	 */
1434 	input_event(input, EV_KEY, BTN_TOUCH, 0);
1435 	input_event(input, EV_KEY, tool, 0);
1436 	input_event(input, EV_SYN, SYN_REPORT, 0);
1437 
1438 	report->tool = 0;
1439 }
1440 
hid_report_set_tool(struct hid_report * report,struct input_dev * input,unsigned int new_tool)1441 static void hid_report_set_tool(struct hid_report *report, struct input_dev *input,
1442 				unsigned int new_tool)
1443 {
1444 	if (report->tool != new_tool)
1445 		hid_report_release_tool(report, input, report->tool);
1446 
1447 	input_event(input, EV_KEY, new_tool, 1);
1448 	report->tool = new_tool;
1449 }
1450 
hidinput_hid_event(struct hid_device * hid,struct hid_field * field,struct hid_usage * usage,__s32 value)1451 void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)
1452 {
1453 	struct input_dev *input;
1454 	struct hid_report *report = field->report;
1455 	unsigned *quirks = &hid->quirks;
1456 
1457 	if (!usage->type)
1458 		return;
1459 
1460 	if (usage->type == EV_PWR) {
1461 		hidinput_update_battery(hid, value);
1462 		return;
1463 	}
1464 
1465 	if (!field->hidinput)
1466 		return;
1467 
1468 	input = field->hidinput->input;
1469 
1470 	if (usage->hat_min < usage->hat_max || usage->hat_dir) {
1471 		int hat_dir = usage->hat_dir;
1472 		if (!hat_dir)
1473 			hat_dir = (value - usage->hat_min) * 8 / (usage->hat_max - usage->hat_min + 1) + 1;
1474 		if (hat_dir < 0 || hat_dir > 8) hat_dir = 0;
1475 		input_event(input, usage->type, usage->code    , hid_hat_to_axis[hat_dir].x);
1476 		input_event(input, usage->type, usage->code + 1, hid_hat_to_axis[hat_dir].y);
1477 		return;
1478 	}
1479 
1480 	/*
1481 	 * Ignore out-of-range values as per HID specification,
1482 	 * section 5.10 and 6.2.25, when NULL state bit is present.
1483 	 * When it's not, clamp the value to match Microsoft's input
1484 	 * driver as mentioned in "Required HID usages for digitizers":
1485 	 * https://msdn.microsoft.com/en-us/library/windows/hardware/dn672278(v=vs.85).asp
1486 	 *
1487 	 * The logical_minimum < logical_maximum check is done so that we
1488 	 * don't unintentionally discard values sent by devices which
1489 	 * don't specify logical min and max.
1490 	 */
1491 	if ((field->flags & HID_MAIN_ITEM_VARIABLE) &&
1492 	    field->logical_minimum < field->logical_maximum) {
1493 		if (field->flags & HID_MAIN_ITEM_NULL_STATE &&
1494 		    (value < field->logical_minimum ||
1495 		     value > field->logical_maximum)) {
1496 			dbg_hid("Ignoring out-of-range value %x\n", value);
1497 			return;
1498 		}
1499 		value = clamp(value,
1500 			      field->logical_minimum,
1501 			      field->logical_maximum);
1502 	}
1503 
1504 	switch (usage->hid) {
1505 	case HID_DG_ERASER:
1506 		report->tool_active |= !!value;
1507 
1508 		/*
1509 		 * if eraser is set, we must enforce BTN_TOOL_RUBBER
1510 		 * to accommodate for devices not following the spec.
1511 		 */
1512 		if (value)
1513 			hid_report_set_tool(report, input, BTN_TOOL_RUBBER);
1514 		else if (report->tool != BTN_TOOL_RUBBER)
1515 			/* value is off, tool is not rubber, ignore */
1516 			return;
1517 
1518 		/* let hid-input set BTN_TOUCH */
1519 		break;
1520 
1521 	case HID_DG_INVERT:
1522 		report->tool_active |= !!value;
1523 
1524 		/*
1525 		 * If invert is set, we store BTN_TOOL_RUBBER.
1526 		 */
1527 		if (value)
1528 			hid_report_set_tool(report, input, BTN_TOOL_RUBBER);
1529 		else if (!report->tool_active)
1530 			/* tool_active not set means Invert and Eraser are not set */
1531 			hid_report_release_tool(report, input, BTN_TOOL_RUBBER);
1532 
1533 		/* no further processing */
1534 		return;
1535 
1536 	case HID_DG_INRANGE:
1537 		report->tool_active |= !!value;
1538 
1539 		if (report->tool_active) {
1540 			/*
1541 			 * if tool is not set but is marked as active,
1542 			 * assume ours
1543 			 */
1544 			if (!report->tool)
1545 				report->tool = usage->code;
1546 
1547 			/* drivers may have changed the value behind our back, resend it */
1548 			hid_report_set_tool(report, input, report->tool);
1549 		} else {
1550 			hid_report_release_tool(report, input, usage->code);
1551 		}
1552 
1553 		/* reset tool_active for the next event */
1554 		report->tool_active = false;
1555 
1556 		/* no further processing */
1557 		return;
1558 
1559 	case HID_DG_TIPSWITCH:
1560 		report->tool_active |= !!value;
1561 
1562 		/* if tool is set to RUBBER we should ignore the current value */
1563 		if (report->tool == BTN_TOOL_RUBBER)
1564 			return;
1565 
1566 		break;
1567 
1568 	case HID_DG_TIPPRESSURE:
1569 		if (*quirks & HID_QUIRK_NOTOUCH) {
1570 			int a = field->logical_minimum;
1571 			int b = field->logical_maximum;
1572 
1573 			if (value > a + ((b - a) >> 3)) {
1574 				input_event(input, EV_KEY, BTN_TOUCH, 1);
1575 				report->tool_active = true;
1576 			}
1577 		}
1578 		break;
1579 
1580 	case HID_UP_PID | 0x83UL: /* Simultaneous Effects Max */
1581 		dbg_hid("Maximum Effects - %d\n",value);
1582 		return;
1583 
1584 	case HID_UP_PID | 0x7fUL:
1585 		dbg_hid("PID Pool Report\n");
1586 		return;
1587 	}
1588 
1589 	switch (usage->type) {
1590 	case EV_KEY:
1591 		if (usage->code == 0) /* Key 0 is "unassigned", not KEY_UNKNOWN */
1592 			return;
1593 		break;
1594 
1595 	case EV_REL:
1596 		if (usage->code == REL_WHEEL_HI_RES ||
1597 		    usage->code == REL_HWHEEL_HI_RES) {
1598 			hidinput_handle_scroll(usage, input, value);
1599 			return;
1600 		}
1601 		break;
1602 
1603 	case EV_ABS:
1604 		if ((field->flags & HID_MAIN_ITEM_RELATIVE) &&
1605 		    usage->code == ABS_VOLUME) {
1606 			int count = abs(value);
1607 			int direction = value > 0 ? KEY_VOLUMEUP : KEY_VOLUMEDOWN;
1608 			int i;
1609 
1610 			for (i = 0; i < count; i++) {
1611 				input_event(input, EV_KEY, direction, 1);
1612 				input_sync(input);
1613 				input_event(input, EV_KEY, direction, 0);
1614 				input_sync(input);
1615 			}
1616 			return;
1617 
1618 		} else if (((*quirks & HID_QUIRK_X_INVERT) && usage->code == ABS_X) ||
1619 			   ((*quirks & HID_QUIRK_Y_INVERT) && usage->code == ABS_Y))
1620 			value = field->logical_maximum - value;
1621 		break;
1622 	}
1623 
1624 	/*
1625 	 * Ignore reports for absolute data if the data didn't change. This is
1626 	 * not only an optimization but also fixes 'dead' key reports. Some
1627 	 * RollOver implementations for localized keys (like BACKSLASH/PIPE; HID
1628 	 * 0x31 and 0x32) report multiple keys, even though a localized keyboard
1629 	 * can only have one of them physically available. The 'dead' keys
1630 	 * report constant 0. As all map to the same keycode, they'd confuse
1631 	 * the input layer. If we filter the 'dead' keys on the HID level, we
1632 	 * skip the keycode translation and only forward real events.
1633 	 */
1634 	if (!(field->flags & (HID_MAIN_ITEM_RELATIVE |
1635 	                      HID_MAIN_ITEM_BUFFERED_BYTE)) &&
1636 			      (field->flags & HID_MAIN_ITEM_VARIABLE) &&
1637 	    usage->usage_index < field->maxusage &&
1638 	    value == field->value[usage->usage_index])
1639 		return;
1640 
1641 	/* report the usage code as scancode if the key status has changed */
1642 	if (usage->type == EV_KEY &&
1643 	    (!test_bit(usage->code, input->key)) == value)
1644 		input_event(input, EV_MSC, MSC_SCAN, usage->hid);
1645 
1646 	input_event(input, usage->type, usage->code, value);
1647 
1648 	if ((field->flags & HID_MAIN_ITEM_RELATIVE) &&
1649 	    usage->type == EV_KEY && value) {
1650 		input_sync(input);
1651 		input_event(input, usage->type, usage->code, 0);
1652 	}
1653 }
1654 
hidinput_report_event(struct hid_device * hid,struct hid_report * report)1655 void hidinput_report_event(struct hid_device *hid, struct hid_report *report)
1656 {
1657 	struct hid_input *hidinput;
1658 
1659 	if (hid->quirks & HID_QUIRK_NO_INPUT_SYNC)
1660 		return;
1661 
1662 	list_for_each_entry(hidinput, &hid->inputs, list)
1663 		input_sync(hidinput->input);
1664 }
1665 EXPORT_SYMBOL_GPL(hidinput_report_event);
1666 
hidinput_find_field(struct hid_device * hid,unsigned int type,unsigned int code,struct hid_field ** field)1667 static int hidinput_find_field(struct hid_device *hid, unsigned int type,
1668 			       unsigned int code, struct hid_field **field)
1669 {
1670 	struct hid_report *report;
1671 	int i, j;
1672 
1673 	list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
1674 		for (i = 0; i < report->maxfield; i++) {
1675 			*field = report->field[i];
1676 			for (j = 0; j < (*field)->maxusage; j++)
1677 				if ((*field)->usage[j].type == type && (*field)->usage[j].code == code)
1678 					return j;
1679 		}
1680 	}
1681 	return -1;
1682 }
1683 
hidinput_get_led_field(struct hid_device * hid)1684 struct hid_field *hidinput_get_led_field(struct hid_device *hid)
1685 {
1686 	struct hid_report *report;
1687 	struct hid_field *field;
1688 	int i, j;
1689 
1690 	list_for_each_entry(report,
1691 			    &hid->report_enum[HID_OUTPUT_REPORT].report_list,
1692 			    list) {
1693 		for (i = 0; i < report->maxfield; i++) {
1694 			field = report->field[i];
1695 			for (j = 0; j < field->maxusage; j++)
1696 				if (field->usage[j].type == EV_LED)
1697 					return field;
1698 		}
1699 	}
1700 	return NULL;
1701 }
1702 EXPORT_SYMBOL_GPL(hidinput_get_led_field);
1703 
hidinput_count_leds(struct hid_device * hid)1704 unsigned int hidinput_count_leds(struct hid_device *hid)
1705 {
1706 	struct hid_report *report;
1707 	struct hid_field *field;
1708 	int i, j;
1709 	unsigned int count = 0;
1710 
1711 	list_for_each_entry(report,
1712 			    &hid->report_enum[HID_OUTPUT_REPORT].report_list,
1713 			    list) {
1714 		for (i = 0; i < report->maxfield; i++) {
1715 			field = report->field[i];
1716 			for (j = 0; j < field->maxusage; j++)
1717 				if (field->usage[j].type == EV_LED &&
1718 				    field->value[j])
1719 					count += 1;
1720 		}
1721 	}
1722 	return count;
1723 }
1724 EXPORT_SYMBOL_GPL(hidinput_count_leds);
1725 
hidinput_led_worker(struct work_struct * work)1726 static void hidinput_led_worker(struct work_struct *work)
1727 {
1728 	struct hid_device *hid = container_of(work, struct hid_device,
1729 					      led_work);
1730 	struct hid_field *field;
1731 	struct hid_report *report;
1732 	int ret;
1733 	u32 len;
1734 	__u8 *buf;
1735 
1736 	field = hidinput_get_led_field(hid);
1737 	if (!field)
1738 		return;
1739 
1740 	/*
1741 	 * field->report is accessed unlocked regarding HID core. So there might
1742 	 * be another incoming SET-LED request from user-space, which changes
1743 	 * the LED state while we assemble our outgoing buffer. However, this
1744 	 * doesn't matter as hid_output_report() correctly converts it into a
1745 	 * boolean value no matter what information is currently set on the LED
1746 	 * field (even garbage). So the remote device will always get a valid
1747 	 * request.
1748 	 * And in case we send a wrong value, a next led worker is spawned
1749 	 * for every SET-LED request so the following worker will send the
1750 	 * correct value, guaranteed!
1751 	 */
1752 
1753 	report = field->report;
1754 
1755 	/* use custom SET_REPORT request if possible (asynchronous) */
1756 	if (hid->ll_driver->request)
1757 		return hid->ll_driver->request(hid, report, HID_REQ_SET_REPORT);
1758 
1759 	/* fall back to generic raw-output-report */
1760 	len = hid_report_len(report);
1761 	buf = hid_alloc_report_buf(report, GFP_KERNEL);
1762 	if (!buf)
1763 		return;
1764 
1765 	hid_output_report(report, buf);
1766 	/* synchronous output report */
1767 	ret = hid_hw_output_report(hid, buf, len);
1768 	if (ret == -ENOSYS)
1769 		hid_hw_raw_request(hid, report->id, buf, len, HID_OUTPUT_REPORT,
1770 				HID_REQ_SET_REPORT);
1771 	kfree(buf);
1772 }
1773 
hidinput_input_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)1774 static int hidinput_input_event(struct input_dev *dev, unsigned int type,
1775 				unsigned int code, int value)
1776 {
1777 	struct hid_device *hid = input_get_drvdata(dev);
1778 	struct hid_field *field;
1779 	int offset;
1780 
1781 	if (type == EV_FF)
1782 		return input_ff_event(dev, type, code, value);
1783 
1784 	if (type != EV_LED)
1785 		return -1;
1786 
1787 	if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
1788 		hid_warn(dev, "event field not found\n");
1789 		return -1;
1790 	}
1791 
1792 	hid_set_field(field, offset, value);
1793 
1794 	schedule_work(&hid->led_work);
1795 	return 0;
1796 }
1797 
hidinput_open(struct input_dev * dev)1798 static int hidinput_open(struct input_dev *dev)
1799 {
1800 	struct hid_device *hid = input_get_drvdata(dev);
1801 
1802 	return hid_hw_open(hid);
1803 }
1804 
hidinput_close(struct input_dev * dev)1805 static void hidinput_close(struct input_dev *dev)
1806 {
1807 	struct hid_device *hid = input_get_drvdata(dev);
1808 
1809 	hid_hw_close(hid);
1810 }
1811 
__hidinput_change_resolution_multipliers(struct hid_device * hid,struct hid_report * report,bool use_logical_max)1812 static bool __hidinput_change_resolution_multipliers(struct hid_device *hid,
1813 		struct hid_report *report, bool use_logical_max)
1814 {
1815 	struct hid_usage *usage;
1816 	bool update_needed = false;
1817 	bool get_report_completed = false;
1818 	int i, j;
1819 
1820 	if (report->maxfield == 0)
1821 		return false;
1822 
1823 	for (i = 0; i < report->maxfield; i++) {
1824 		__s32 value = use_logical_max ?
1825 			      report->field[i]->logical_maximum :
1826 			      report->field[i]->logical_minimum;
1827 
1828 		/* There is no good reason for a Resolution
1829 		 * Multiplier to have a count other than 1.
1830 		 * Ignore that case.
1831 		 */
1832 		if (report->field[i]->report_count != 1)
1833 			continue;
1834 
1835 		for (j = 0; j < report->field[i]->maxusage; j++) {
1836 			usage = &report->field[i]->usage[j];
1837 
1838 			if (usage->hid != HID_GD_RESOLUTION_MULTIPLIER)
1839 				continue;
1840 
1841 			/*
1842 			 * If we have more than one feature within this
1843 			 * report we need to fill in the bits from the
1844 			 * others before we can overwrite the ones for the
1845 			 * Resolution Multiplier.
1846 			 *
1847 			 * But if we're not allowed to read from the device,
1848 			 * we just bail. Such a device should not exist
1849 			 * anyway.
1850 			 */
1851 			if (!get_report_completed && report->maxfield > 1) {
1852 				if (hid->quirks & HID_QUIRK_NO_INIT_REPORTS)
1853 					return update_needed;
1854 
1855 				hid_hw_request(hid, report, HID_REQ_GET_REPORT);
1856 				hid_hw_wait(hid);
1857 				get_report_completed = true;
1858 			}
1859 
1860 			report->field[i]->value[j] = value;
1861 			update_needed = true;
1862 		}
1863 	}
1864 
1865 	return update_needed;
1866 }
1867 
hidinput_change_resolution_multipliers(struct hid_device * hid)1868 static void hidinput_change_resolution_multipliers(struct hid_device *hid)
1869 {
1870 	struct hid_report_enum *rep_enum;
1871 	struct hid_report *rep;
1872 	int ret;
1873 
1874 	rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
1875 	list_for_each_entry(rep, &rep_enum->report_list, list) {
1876 		bool update_needed = __hidinput_change_resolution_multipliers(hid,
1877 								     rep, true);
1878 
1879 		if (update_needed) {
1880 			ret = __hid_request(hid, rep, HID_REQ_SET_REPORT);
1881 			if (ret) {
1882 				__hidinput_change_resolution_multipliers(hid,
1883 								    rep, false);
1884 				return;
1885 			}
1886 		}
1887 	}
1888 
1889 	/* refresh our structs */
1890 	hid_setup_resolution_multiplier(hid);
1891 }
1892 
report_features(struct hid_device * hid)1893 static void report_features(struct hid_device *hid)
1894 {
1895 	struct hid_driver *drv = hid->driver;
1896 	struct hid_report_enum *rep_enum;
1897 	struct hid_report *rep;
1898 	struct hid_usage *usage;
1899 	int i, j;
1900 
1901 	rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
1902 	list_for_each_entry(rep, &rep_enum->report_list, list)
1903 		for (i = 0; i < rep->maxfield; i++) {
1904 			/* Ignore if report count is out of bounds. */
1905 			if (rep->field[i]->report_count < 1)
1906 				continue;
1907 
1908 			for (j = 0; j < rep->field[i]->maxusage; j++) {
1909 				usage = &rep->field[i]->usage[j];
1910 
1911 				/* Verify if Battery Strength feature is available */
1912 				if (usage->hid == HID_DC_BATTERYSTRENGTH)
1913 					hidinput_setup_battery(hid, HID_FEATURE_REPORT,
1914 							       rep->field[i], false);
1915 
1916 				if (drv->feature_mapping)
1917 					drv->feature_mapping(hid, rep->field[i], usage);
1918 			}
1919 		}
1920 }
1921 
hidinput_allocate(struct hid_device * hid,unsigned int application)1922 static struct hid_input *hidinput_allocate(struct hid_device *hid,
1923 					   unsigned int application)
1924 {
1925 	struct hid_input *hidinput = kzalloc(sizeof(*hidinput), GFP_KERNEL);
1926 	struct input_dev *input_dev = input_allocate_device();
1927 	const char *suffix = NULL;
1928 	size_t suffix_len, name_len;
1929 
1930 	if (!hidinput || !input_dev)
1931 		goto fail;
1932 
1933 	if ((hid->quirks & HID_QUIRK_INPUT_PER_APP) &&
1934 	    hid->maxapplication > 1) {
1935 		switch (application) {
1936 		case HID_GD_KEYBOARD:
1937 			suffix = "Keyboard";
1938 			break;
1939 		case HID_GD_KEYPAD:
1940 			suffix = "Keypad";
1941 			break;
1942 		case HID_GD_MOUSE:
1943 			suffix = "Mouse";
1944 			break;
1945 		case HID_DG_PEN:
1946 			/*
1947 			 * yes, there is an issue here:
1948 			 *  DG_PEN -> "Stylus"
1949 			 *  DG_STYLUS -> "Pen"
1950 			 * But changing this now means users with config snippets
1951 			 * will have to change it and the test suite will not be happy.
1952 			 */
1953 			suffix = "Stylus";
1954 			break;
1955 		case HID_DG_STYLUS:
1956 			suffix = "Pen";
1957 			break;
1958 		case HID_DG_TOUCHSCREEN:
1959 			suffix = "Touchscreen";
1960 			break;
1961 		case HID_DG_TOUCHPAD:
1962 			suffix = "Touchpad";
1963 			break;
1964 		case HID_GD_SYSTEM_CONTROL:
1965 			suffix = "System Control";
1966 			break;
1967 		case HID_CP_CONSUMER_CONTROL:
1968 			suffix = "Consumer Control";
1969 			break;
1970 		case HID_GD_WIRELESS_RADIO_CTLS:
1971 			suffix = "Wireless Radio Control";
1972 			break;
1973 		case HID_GD_SYSTEM_MULTIAXIS:
1974 			suffix = "System Multi Axis";
1975 			break;
1976 		default:
1977 			break;
1978 		}
1979 	}
1980 
1981 	if (suffix) {
1982 		name_len = strlen(hid->name);
1983 		suffix_len = strlen(suffix);
1984 		if ((name_len < suffix_len) ||
1985 		    strcmp(hid->name + name_len - suffix_len, suffix)) {
1986 			hidinput->name = kasprintf(GFP_KERNEL, "%s %s",
1987 						   hid->name, suffix);
1988 			if (!hidinput->name)
1989 				goto fail;
1990 		}
1991 	}
1992 
1993 	input_set_drvdata(input_dev, hid);
1994 	input_dev->event = hidinput_input_event;
1995 	input_dev->open = hidinput_open;
1996 	input_dev->close = hidinput_close;
1997 	input_dev->setkeycode = hidinput_setkeycode;
1998 	input_dev->getkeycode = hidinput_getkeycode;
1999 
2000 	input_dev->name = hidinput->name ? hidinput->name : hid->name;
2001 	input_dev->phys = hid->phys;
2002 	input_dev->uniq = hid->uniq;
2003 	input_dev->id.bustype = hid->bus;
2004 	input_dev->id.vendor  = hid->vendor;
2005 	input_dev->id.product = hid->product;
2006 	input_dev->id.version = hid->version;
2007 	input_dev->dev.parent = &hid->dev;
2008 
2009 	hidinput->input = input_dev;
2010 	hidinput->application = application;
2011 	list_add_tail(&hidinput->list, &hid->inputs);
2012 
2013 	INIT_LIST_HEAD(&hidinput->reports);
2014 
2015 	return hidinput;
2016 
2017 fail:
2018 	kfree(hidinput);
2019 	input_free_device(input_dev);
2020 	hid_err(hid, "Out of memory during hid input probe\n");
2021 	return NULL;
2022 }
2023 
hidinput_has_been_populated(struct hid_input * hidinput)2024 static bool hidinput_has_been_populated(struct hid_input *hidinput)
2025 {
2026 	int i;
2027 	unsigned long r = 0;
2028 
2029 	for (i = 0; i < BITS_TO_LONGS(EV_CNT); i++)
2030 		r |= hidinput->input->evbit[i];
2031 
2032 	for (i = 0; i < BITS_TO_LONGS(KEY_CNT); i++)
2033 		r |= hidinput->input->keybit[i];
2034 
2035 	for (i = 0; i < BITS_TO_LONGS(REL_CNT); i++)
2036 		r |= hidinput->input->relbit[i];
2037 
2038 	for (i = 0; i < BITS_TO_LONGS(ABS_CNT); i++)
2039 		r |= hidinput->input->absbit[i];
2040 
2041 	for (i = 0; i < BITS_TO_LONGS(MSC_CNT); i++)
2042 		r |= hidinput->input->mscbit[i];
2043 
2044 	for (i = 0; i < BITS_TO_LONGS(LED_CNT); i++)
2045 		r |= hidinput->input->ledbit[i];
2046 
2047 	for (i = 0; i < BITS_TO_LONGS(SND_CNT); i++)
2048 		r |= hidinput->input->sndbit[i];
2049 
2050 	for (i = 0; i < BITS_TO_LONGS(FF_CNT); i++)
2051 		r |= hidinput->input->ffbit[i];
2052 
2053 	for (i = 0; i < BITS_TO_LONGS(SW_CNT); i++)
2054 		r |= hidinput->input->swbit[i];
2055 
2056 	return !!r;
2057 }
2058 
hidinput_cleanup_hidinput(struct hid_device * hid,struct hid_input * hidinput)2059 static void hidinput_cleanup_hidinput(struct hid_device *hid,
2060 		struct hid_input *hidinput)
2061 {
2062 	struct hid_report *report;
2063 	int i, k;
2064 
2065 	list_del(&hidinput->list);
2066 	input_free_device(hidinput->input);
2067 	kfree(hidinput->name);
2068 
2069 	for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
2070 		if (k == HID_OUTPUT_REPORT &&
2071 			hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)
2072 			continue;
2073 
2074 		list_for_each_entry(report, &hid->report_enum[k].report_list,
2075 				    list) {
2076 
2077 			for (i = 0; i < report->maxfield; i++)
2078 				if (report->field[i]->hidinput == hidinput)
2079 					report->field[i]->hidinput = NULL;
2080 		}
2081 	}
2082 
2083 	kfree(hidinput);
2084 }
2085 
hidinput_match(struct hid_report * report)2086 static struct hid_input *hidinput_match(struct hid_report *report)
2087 {
2088 	struct hid_device *hid = report->device;
2089 	struct hid_input *hidinput;
2090 
2091 	list_for_each_entry(hidinput, &hid->inputs, list) {
2092 		if (hidinput->report &&
2093 		    hidinput->report->id == report->id)
2094 			return hidinput;
2095 	}
2096 
2097 	return NULL;
2098 }
2099 
hidinput_match_application(struct hid_report * report)2100 static struct hid_input *hidinput_match_application(struct hid_report *report)
2101 {
2102 	struct hid_device *hid = report->device;
2103 	struct hid_input *hidinput;
2104 
2105 	list_for_each_entry(hidinput, &hid->inputs, list) {
2106 		if (hidinput->application == report->application)
2107 			return hidinput;
2108 
2109 		/*
2110 		 * Keep SystemControl and ConsumerControl applications together
2111 		 * with the main keyboard, if present.
2112 		 */
2113 		if ((report->application == HID_GD_SYSTEM_CONTROL ||
2114 		     report->application == HID_CP_CONSUMER_CONTROL) &&
2115 		    hidinput->application == HID_GD_KEYBOARD) {
2116 			return hidinput;
2117 		}
2118 	}
2119 
2120 	return NULL;
2121 }
2122 
hidinput_configure_usages(struct hid_input * hidinput,struct hid_report * report)2123 static inline void hidinput_configure_usages(struct hid_input *hidinput,
2124 					     struct hid_report *report)
2125 {
2126 	int i, j, k;
2127 	int first_field_index = 0;
2128 	int slot_collection_index = -1;
2129 	int prev_collection_index = -1;
2130 	unsigned int slot_idx = 0;
2131 	struct hid_field *field;
2132 
2133 	/*
2134 	 * First tag all the fields that are part of a slot,
2135 	 * a slot needs to have one Contact ID in the collection
2136 	 */
2137 	for (i = 0; i < report->maxfield; i++) {
2138 		field = report->field[i];
2139 
2140 		/* ignore fields without usage */
2141 		if (field->maxusage < 1)
2142 			continue;
2143 
2144 		/*
2145 		 * janitoring when collection_index changes
2146 		 */
2147 		if (prev_collection_index != field->usage->collection_index) {
2148 			prev_collection_index = field->usage->collection_index;
2149 			first_field_index = i;
2150 		}
2151 
2152 		/*
2153 		 * if we already found a Contact ID in the collection,
2154 		 * tag and continue to the next.
2155 		 */
2156 		if (slot_collection_index == field->usage->collection_index) {
2157 			field->slot_idx = slot_idx;
2158 			continue;
2159 		}
2160 
2161 		/* check if the current field has Contact ID */
2162 		for (j = 0; j < field->maxusage; j++) {
2163 			if (field->usage[j].hid == HID_DG_CONTACTID) {
2164 				slot_collection_index = field->usage->collection_index;
2165 				slot_idx++;
2166 
2167 				/*
2168 				 * mark all previous fields and this one in the
2169 				 * current collection to be slotted.
2170 				 */
2171 				for (k = first_field_index; k <= i; k++)
2172 					report->field[k]->slot_idx = slot_idx;
2173 				break;
2174 			}
2175 		}
2176 	}
2177 
2178 	for (i = 0; i < report->maxfield; i++)
2179 		for (j = 0; j < report->field[i]->maxusage; j++)
2180 			hidinput_configure_usage(hidinput, report->field[i],
2181 						 report->field[i]->usage + j,
2182 						 j);
2183 }
2184 
2185 /*
2186  * Register the input device; print a message.
2187  * Configure the input layer interface
2188  * Read all reports and initialize the absolute field values.
2189  */
2190 
hidinput_connect(struct hid_device * hid,unsigned int force)2191 int hidinput_connect(struct hid_device *hid, unsigned int force)
2192 {
2193 	struct hid_driver *drv = hid->driver;
2194 	struct hid_report *report;
2195 	struct hid_input *next, *hidinput = NULL;
2196 	unsigned int application;
2197 	int i, k;
2198 
2199 	INIT_LIST_HEAD(&hid->inputs);
2200 	INIT_WORK(&hid->led_work, hidinput_led_worker);
2201 
2202 	hid->status &= ~HID_STAT_DUP_DETECTED;
2203 
2204 	if (!force) {
2205 		for (i = 0; i < hid->maxcollection; i++) {
2206 			struct hid_collection *col = &hid->collection[i];
2207 			if (col->type == HID_COLLECTION_APPLICATION ||
2208 					col->type == HID_COLLECTION_PHYSICAL)
2209 				if (IS_INPUT_APPLICATION(col->usage))
2210 					break;
2211 		}
2212 
2213 		if (i == hid->maxcollection)
2214 			return -1;
2215 	}
2216 
2217 	report_features(hid);
2218 
2219 	for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
2220 		if (k == HID_OUTPUT_REPORT &&
2221 			hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)
2222 			continue;
2223 
2224 		list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
2225 
2226 			if (!report->maxfield)
2227 				continue;
2228 
2229 			application = report->application;
2230 
2231 			/*
2232 			 * Find the previous hidinput report attached
2233 			 * to this report id.
2234 			 */
2235 			if (hid->quirks & HID_QUIRK_MULTI_INPUT)
2236 				hidinput = hidinput_match(report);
2237 			else if (hid->maxapplication > 1 &&
2238 				 (hid->quirks & HID_QUIRK_INPUT_PER_APP))
2239 				hidinput = hidinput_match_application(report);
2240 
2241 			if (!hidinput) {
2242 				hidinput = hidinput_allocate(hid, application);
2243 				if (!hidinput)
2244 					goto out_unwind;
2245 			}
2246 
2247 			hidinput_configure_usages(hidinput, report);
2248 
2249 			if (hid->quirks & HID_QUIRK_MULTI_INPUT)
2250 				hidinput->report = report;
2251 
2252 			list_add_tail(&report->hidinput_list,
2253 				      &hidinput->reports);
2254 		}
2255 	}
2256 
2257 	hidinput_change_resolution_multipliers(hid);
2258 
2259 	list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
2260 		if (drv->input_configured &&
2261 		    drv->input_configured(hid, hidinput))
2262 			goto out_unwind;
2263 
2264 		if (!hidinput_has_been_populated(hidinput)) {
2265 			/* no need to register an input device not populated */
2266 			hidinput_cleanup_hidinput(hid, hidinput);
2267 			continue;
2268 		}
2269 
2270 		if (input_register_device(hidinput->input))
2271 			goto out_unwind;
2272 		hidinput->registered = true;
2273 	}
2274 
2275 	if (list_empty(&hid->inputs)) {
2276 		hid_err(hid, "No inputs registered, leaving\n");
2277 		goto out_unwind;
2278 	}
2279 
2280 	if (hid->status & HID_STAT_DUP_DETECTED)
2281 		hid_dbg(hid,
2282 			"Some usages could not be mapped, please use HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE if this is legitimate.\n");
2283 
2284 	return 0;
2285 
2286 out_unwind:
2287 	/* unwind the ones we already registered */
2288 	hidinput_disconnect(hid);
2289 
2290 	return -1;
2291 }
2292 EXPORT_SYMBOL_GPL(hidinput_connect);
2293 
hidinput_disconnect(struct hid_device * hid)2294 void hidinput_disconnect(struct hid_device *hid)
2295 {
2296 	struct hid_input *hidinput, *next;
2297 
2298 	hidinput_cleanup_battery(hid);
2299 
2300 	list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
2301 		list_del(&hidinput->list);
2302 		if (hidinput->registered)
2303 			input_unregister_device(hidinput->input);
2304 		else
2305 			input_free_device(hidinput->input);
2306 		kfree(hidinput->name);
2307 		kfree(hidinput);
2308 	}
2309 
2310 	/* led_work is spawned by input_dev callbacks, but doesn't access the
2311 	 * parent input_dev at all. Once all input devices are removed, we
2312 	 * know that led_work will never get restarted, so we can cancel it
2313 	 * synchronously and are safe. */
2314 	cancel_work_sync(&hid->led_work);
2315 }
2316 EXPORT_SYMBOL_GPL(hidinput_disconnect);
2317