1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (c) 1999-2002 Vojtech Pavlik
28 #include "input-compat.h"
29 #include "input-core-private.h"
30 #include "input-poller.h"
73 		if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)  in input_defuzz_abs_event()
76 		if (value > old_val - fuzz && value < old_val + fuzz)  in input_defuzz_abs_event()
79 		if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)  in input_defuzz_abs_event()
88 	if (test_bit(EV_REP, dev->evbit) &&  in input_start_autorepeat()
89 	    dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&  in input_start_autorepeat()
90 	    dev->timer.function) {  in input_start_autorepeat()
91 		dev->repeat_key = code;  in input_start_autorepeat()
92 		mod_timer(&dev->timer,  in input_start_autorepeat()
93 			  jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));  in input_start_autorepeat()
99 	del_timer(&dev->timer);  in input_stop_autorepeat()
108  * This function is called with dev->event_lock held and interrupts disabled.
116 	lockdep_assert_held(&dev->event_lock);  in input_pass_values()
119 		handle = rcu_dereference(dev->grab);  in input_pass_values()
121 			count = handle->handle_events(handle, vals, count);  in input_pass_values()
125 		list_for_each_entry_rcu(handle, &dev->h_list, d_node) {  in input_pass_values()
126 			if (handle->open) {  in input_pass_values()
127 				count = handle->handle_events(handle, vals,  in input_pass_values()
136 	if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {  in input_pass_values()
138 			if (v->type == EV_KEY && v->value != 2) {  in input_pass_values()
139 				if (v->value)  in input_pass_values()
140 					input_start_autorepeat(dev, v->code);  in input_pass_values()
158 	struct input_mt *mt = dev->mt;  in input_handle_abs_event()
168 		if (mt && *pval >= 0 && *pval < mt->num_slots)  in input_handle_abs_event()
169 			mt->slot = *pval;  in input_handle_abs_event()
177 		pold = &dev->absinfo[code].value;  in input_handle_abs_event()
179 		pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];  in input_handle_abs_event()
180 		is_new_slot = mt->slot != dev->absinfo[ABS_MT_SLOT].value;  in input_handle_abs_event()
183 		 * Bypass filtering for multi-touch events when  in input_handle_abs_event()
191 						dev->absinfo[code].fuzz);  in input_handle_abs_event()
200 		dev->absinfo[ABS_MT_SLOT].value = mt->slot;  in input_handle_abs_event()
213 	/* filter-out events from inhibited devices */  in input_get_disposition()
214 	if (dev->inhibited)  in input_get_disposition()
235 		if (is_event_supported(code, dev->keybit, KEY_MAX)) {  in input_get_disposition()
237 			/* auto-repeat bypasses state updates */  in input_get_disposition()
243 			if (!!test_bit(code, dev->key) != !!value) {  in input_get_disposition()
245 				__change_bit(code, dev->key);  in input_get_disposition()
252 		if (is_event_supported(code, dev->swbit, SW_MAX) &&  in input_get_disposition()
253 		    !!test_bit(code, dev->sw) != !!value) {  in input_get_disposition()
255 			__change_bit(code, dev->sw);  in input_get_disposition()
261 		if (is_event_supported(code, dev->absbit, ABS_MAX))  in input_get_disposition()
267 		if (is_event_supported(code, dev->relbit, REL_MAX) && value)  in input_get_disposition()
273 		if (is_event_supported(code, dev->mscbit, MSC_MAX))  in input_get_disposition()
279 		if (is_event_supported(code, dev->ledbit, LED_MAX) &&  in input_get_disposition()
280 		    !!test_bit(code, dev->led) != !!value) {  in input_get_disposition()
282 			__change_bit(code, dev->led);  in input_get_disposition()
288 		if (is_event_supported(code, dev->sndbit, SND_MAX)) {  in input_get_disposition()
290 			if (!!test_bit(code, dev->snd) != !!value)  in input_get_disposition()
291 				__change_bit(code, dev->snd);  in input_get_disposition()
297 		if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {  in input_get_disposition()
298 			dev->rep[code] = value;  in input_get_disposition()
320 	if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)  in input_event_dispose()
321 		dev->event(dev, type, code, value);  in input_event_dispose()
327 			v = &dev->vals[dev->num_vals++];  in input_event_dispose()
328 			v->type = EV_ABS;  in input_event_dispose()
329 			v->code = ABS_MT_SLOT;  in input_event_dispose()
330 			v->value = dev->mt->slot;  in input_event_dispose()
333 		v = &dev->vals[dev->num_vals++];  in input_event_dispose()
334 		v->type = type;  in input_event_dispose()
335 		v->code = code;  in input_event_dispose()
336 		v->value = value;  in input_event_dispose()
340 		if (dev->num_vals >= 2)  in input_event_dispose()
341 			input_pass_values(dev, dev->vals, dev->num_vals);  in input_event_dispose()
342 		dev->num_vals = 0;  in input_event_dispose()
349 		dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0);  in input_event_dispose()
350 	} else if (dev->num_vals >= dev->max_vals - 2) {  in input_event_dispose()
351 		dev->vals[dev->num_vals++] = input_value_sync;  in input_event_dispose()
352 		input_pass_values(dev, dev->vals, dev->num_vals);  in input_event_dispose()
353 		dev->num_vals = 0;  in input_event_dispose()
362 	lockdep_assert_held(&dev->event_lock);  in input_handle_event()
374  * input_event() - report new input event
393 	if (is_event_supported(type, dev->evbit, EV_MAX)) {  in input_event()
394 		guard(spinlock_irqsave)(&dev->event_lock);  in input_event()
401  * input_inject_event() - send input event from input handler
414 	struct input_dev *dev = handle->dev;  in input_inject_event()
417 	if (is_event_supported(type, dev->evbit, EV_MAX)) {  in input_inject_event()
418 		guard(spinlock_irqsave)(&dev->event_lock);  in input_inject_event()
421 		grab = rcu_dereference(dev->grab);  in input_inject_event()
430  * input_alloc_absinfo - allocates array of input_absinfo structs
438 	if (dev->absinfo)  in input_alloc_absinfo()
441 	dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL);  in input_alloc_absinfo()
442 	if (!dev->absinfo) {  in input_alloc_absinfo()
443 		dev_err(dev->dev.parent ?: &dev->dev,  in input_alloc_absinfo()
459 	__set_bit(EV_ABS, dev->evbit);  in input_set_abs_params()
460 	__set_bit(axis, dev->absbit);  in input_set_abs_params()
463 	if (!dev->absinfo)  in input_set_abs_params()
466 	absinfo = &dev->absinfo[axis];  in input_set_abs_params()
467 	absinfo->minimum = min;  in input_set_abs_params()
468 	absinfo->maximum = max;  in input_set_abs_params()
469 	absinfo->fuzz = fuzz;  in input_set_abs_params()
470 	absinfo->flat = flat;  in input_set_abs_params()
475  * input_copy_abs - Copy absinfo from one input_dev to another
483  * This is useful to e.g. setup a pen/stylus input-device for combined
491 	if (WARN_ON(!(test_bit(EV_ABS, src->evbit) &&  in input_copy_abs()
492 		      test_bit(src_axis, src->absbit))))  in input_copy_abs()
500 	if (!src->absinfo)  in input_copy_abs()
504 	if (!dst->absinfo)  in input_copy_abs()
507 	dst->absinfo[dst_axis] = src->absinfo[src_axis];  in input_copy_abs()
512  * input_grab_device - grabs device for exclusive use
521 	struct input_dev *dev = handle->dev;  in input_grab_device()
523 	scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {  in input_grab_device()
524 		if (dev->grab)  in input_grab_device()
525 			return -EBUSY;  in input_grab_device()
527 		rcu_assign_pointer(dev->grab, handle);  in input_grab_device()
536 	struct input_dev *dev = handle->dev;  in __input_release_device()
539 	grabber = rcu_dereference_protected(dev->grab,  in __input_release_device()
540 					    lockdep_is_held(&dev->mutex));  in __input_release_device()
542 		rcu_assign_pointer(dev->grab, NULL);  in __input_release_device()
546 		list_for_each_entry(handle, &dev->h_list, d_node)  in __input_release_device()
547 			if (handle->open && handle->handler->start)  in __input_release_device()
548 				handle->handler->start(handle);  in __input_release_device()
553  * input_release_device - release previously grabbed device
563 	struct input_dev *dev = handle->dev;  in input_release_device()
565 	guard(mutex)(&dev->mutex);  in input_release_device()
571  * input_open_device - open input device
579 	struct input_dev *dev = handle->dev;  in input_open_device()
582 	scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {  in input_open_device()
583 		if (dev->going_away)  in input_open_device()
584 			return -ENODEV;  in input_open_device()
586 		handle->open++;  in input_open_device()
588 		if (handle->handler->passive_observer)  in input_open_device()
591 		if (dev->users++ || dev->inhibited) {  in input_open_device()
599 		if (dev->open) {  in input_open_device()
600 			error = dev->open(dev);  in input_open_device()
602 				dev->users--;  in input_open_device()
603 				handle->open--;  in input_open_device()
613 		if (dev->poller)  in input_open_device()
614 			input_dev_poller_start(dev->poller);  in input_open_device()
623 	struct input_dev *dev = handle->dev;  in input_flush_device()
625 	scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {  in input_flush_device()
626 		if (dev->flush)  in input_flush_device()
627 			return dev->flush(dev, file);  in input_flush_device()
635  * input_close_device - close input device
643 	struct input_dev *dev = handle->dev;  in input_close_device()
645 	guard(mutex)(&dev->mutex);  in input_close_device()
649 	if (!handle->handler->passive_observer) {  in input_close_device()
650 		if (!--dev->users && !dev->inhibited) {  in input_close_device()
651 			if (dev->poller)  in input_close_device()
652 				input_dev_poller_stop(dev->poller);  in input_close_device()
653 			if (dev->close)  in input_close_device()
654 				dev->close(dev);  in input_close_device()
658 	if (!--handle->open) {  in input_close_device()
671  * The function must be called with dev->event_lock held.
678 	lockdep_assert_held(&dev->event_lock);  in input_dev_release_keys()
680 	if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {  in input_dev_release_keys()
681 		for_each_set_bit(code, dev->key, KEY_CNT) {  in input_dev_release_keys()
698 	 * Mark device as going away. Note that we take dev->mutex here  in input_disconnect_device()
699 	 * not to protect access to dev->going_away but rather to ensure  in input_disconnect_device()
702 	scoped_guard(mutex, &dev->mutex)  in input_disconnect_device()
703 		dev->going_away = true;  in input_disconnect_device()
705 	guard(spinlock_irq)(&dev->event_lock);  in input_disconnect_device()
716 	list_for_each_entry(handle, &dev->h_list, d_node)  in input_disconnect_device()
717 		handle->open = 0;  in input_disconnect_device()
721  * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
733 	switch (ke->len) {  in input_scancode_to_scalar()
735 		*scancode = *((u8 *)ke->scancode);  in input_scancode_to_scalar()
739 		*scancode = *((u16 *)ke->scancode);  in input_scancode_to_scalar()
743 		*scancode = *((u32 *)ke->scancode);  in input_scancode_to_scalar()
747 		return -EINVAL;  in input_scancode_to_scalar()
762 	switch (dev->keycodesize) {  in input_fetch_keycode()
764 		return ((u8 *)dev->keycode)[index];  in input_fetch_keycode()
767 		return ((u16 *)dev->keycode)[index];  in input_fetch_keycode()
770 		return ((u32 *)dev->keycode)[index];  in input_fetch_keycode()
780 	if (!dev->keycodesize)  in input_default_getkeycode()
781 		return -EINVAL;  in input_default_getkeycode()
783 	if (ke->flags & INPUT_KEYMAP_BY_INDEX)  in input_default_getkeycode()
784 		index = ke->index;  in input_default_getkeycode()
791 	if (index >= dev->keycodemax)  in input_default_getkeycode()
792 		return -EINVAL;  in input_default_getkeycode()
794 	ke->keycode = input_fetch_keycode(dev, index);  in input_default_getkeycode()
795 	ke->index = index;  in input_default_getkeycode()
796 	ke->len = sizeof(index);  in input_default_getkeycode()
797 	memcpy(ke->scancode, &index, sizeof(index));  in input_default_getkeycode()
810 	if (!dev->keycodesize)  in input_default_setkeycode()
811 		return -EINVAL;  in input_default_setkeycode()
813 	if (ke->flags & INPUT_KEYMAP_BY_INDEX) {  in input_default_setkeycode()
814 		index = ke->index;  in input_default_setkeycode()
821 	if (index >= dev->keycodemax)  in input_default_setkeycode()
822 		return -EINVAL;  in input_default_setkeycode()
824 	if (dev->keycodesize < sizeof(ke->keycode) &&  in input_default_setkeycode()
825 			(ke->keycode >> (dev->keycodesize * 8)))  in input_default_setkeycode()
826 		return -EINVAL;  in input_default_setkeycode()
828 	switch (dev->keycodesize) {  in input_default_setkeycode()
830 			u8 *k = (u8 *)dev->keycode;  in input_default_setkeycode()
832 			k[index] = ke->keycode;  in input_default_setkeycode()
836 			u16 *k = (u16 *)dev->keycode;  in input_default_setkeycode()
838 			k[index] = ke->keycode;  in input_default_setkeycode()
842 			u32 *k = (u32 *)dev->keycode;  in input_default_setkeycode()
844 			k[index] = ke->keycode;  in input_default_setkeycode()
850 		__clear_bit(*old_keycode, dev->keybit);  in input_default_setkeycode()
851 		for (i = 0; i < dev->keycodemax; i++) {  in input_default_setkeycode()
853 				__set_bit(*old_keycode, dev->keybit);  in input_default_setkeycode()
860 	__set_bit(ke->keycode, dev->keybit);  in input_default_setkeycode()
865  * input_get_keycode - retrieve keycode currently mapped to a given scancode
874 	guard(spinlock_irqsave)(&dev->event_lock);  in input_get_keycode()
876 	return dev->getkeycode(dev, ke);  in input_get_keycode()
881  * input_set_keycode - attribute a keycode to a given scancode
894 	if (ke->keycode > KEY_MAX)  in input_set_keycode()
895 		return -EINVAL;  in input_set_keycode()
897 	guard(spinlock_irqsave)(&dev->event_lock);  in input_set_keycode()
899 	error = dev->setkeycode(dev, ke, &old_keycode);  in input_set_keycode()
904 	__clear_bit(KEY_RESERVED, dev->keybit);  in input_set_keycode()
911 		dev_warn(dev->dev.parent ?: &dev->dev,  in input_set_keycode()
914 	} else if (test_bit(EV_KEY, dev->evbit) &&  in input_set_keycode()
915 		   !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&  in input_set_keycode()
916 		   __test_and_clear_bit(old_keycode, dev->key)) {  in input_set_keycode()
936 	if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)  in input_match_device_id()
937 		if (id->bustype != dev->id.bustype)  in input_match_device_id()
940 	if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)  in input_match_device_id()
941 		if (id->vendor != dev->id.vendor)  in input_match_device_id()
944 	if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)  in input_match_device_id()
945 		if (id->product != dev->id.product)  in input_match_device_id()
948 	if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)  in input_match_device_id()
949 		if (id->version != dev->id.version)  in input_match_device_id()
952 	if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||  in input_match_device_id()
953 	    !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||  in input_match_device_id()
954 	    !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||  in input_match_device_id()
955 	    !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||  in input_match_device_id()
956 	    !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||  in input_match_device_id()
957 	    !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||  in input_match_device_id()
958 	    !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||  in input_match_device_id()
959 	    !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||  in input_match_device_id()
960 	    !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||  in input_match_device_id()
961 	    !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {  in input_match_device_id()
974 	for (id = handler->id_table; id->flags || id->driver_info; id++) {  in input_match_device()
976 		    (!handler->match || handler->match(handler, dev))) {  in input_match_device()
991 		return -ENODEV;  in input_attach_handler()
993 	error = handler->connect(handler, dev, id);  in input_attach_handler()
994 	if (error && error != -ENODEV)  in input_attach_handler()
996 		       handler->name, kobject_name(&dev->dev.kobj), error);  in input_attach_handler()
1015 			len += snprintf(buf + len, max(buf_size - len, 0),  in input_bits_to_string()
1056 	struct seq_file *seq = file->private_data;  in input_proc_devices_poll()
1057 	struct input_seq_state *state = seq->private;  in input_proc_devices_poll()
1060 	if (state->input_devices_state != input_devices_state) {  in input_proc_devices_poll()
1061 		state->input_devices_state = input_devices_state;  in input_proc_devices_poll()
1070 	struct input_seq_state *state = seq->private;  in input_devices_seq_start()
1075 		state->mutex_acquired = false;  in input_devices_seq_start()
1079 	state->mutex_acquired = true;  in input_devices_seq_start()
1091 	struct input_seq_state *state = seq->private;  in input_seq_stop()
1093 	if (state->mutex_acquired)  in input_seq_stop()
1106 	for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {  in input_seq_print_bitmap()
1126 	const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);  in input_devices_seq_show()
1130 		   dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);  in input_devices_seq_show()
1132 	seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");  in input_devices_seq_show()
1133 	seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");  in input_devices_seq_show()
1135 	seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");  in input_devices_seq_show()
1138 	list_for_each_entry(handle, &dev->h_list, d_node)  in input_devices_seq_show()
1139 		seq_printf(seq, "%s ", handle->name);  in input_devices_seq_show()
1142 	input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);  in input_devices_seq_show()
1144 	input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);  in input_devices_seq_show()
1145 	if (test_bit(EV_KEY, dev->evbit))  in input_devices_seq_show()
1146 		input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);  in input_devices_seq_show()
1147 	if (test_bit(EV_REL, dev->evbit))  in input_devices_seq_show()
1148 		input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);  in input_devices_seq_show()
1149 	if (test_bit(EV_ABS, dev->evbit))  in input_devices_seq_show()
1150 		input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);  in input_devices_seq_show()
1151 	if (test_bit(EV_MSC, dev->evbit))  in input_devices_seq_show()
1152 		input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);  in input_devices_seq_show()
1153 	if (test_bit(EV_LED, dev->evbit))  in input_devices_seq_show()
1154 		input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);  in input_devices_seq_show()
1155 	if (test_bit(EV_SND, dev->evbit))  in input_devices_seq_show()
1156 		input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);  in input_devices_seq_show()
1157 	if (test_bit(EV_FF, dev->evbit))  in input_devices_seq_show()
1158 		input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);  in input_devices_seq_show()
1159 	if (test_bit(EV_SW, dev->evbit))  in input_devices_seq_show()
1160 		input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);  in input_devices_seq_show()
1191 	struct input_seq_state *state = seq->private;  in input_handlers_seq_start()
1196 		state->mutex_acquired = false;  in input_handlers_seq_start()
1200 	state->mutex_acquired = true;  in input_handlers_seq_start()
1201 	state->pos = *pos;  in input_handlers_seq_start()
1208 	struct input_seq_state *state = seq->private;  in input_handlers_seq_next()
1210 	state->pos = *pos + 1;  in input_handlers_seq_next()
1217 	struct input_seq_state *state = seq->private;  in input_handlers_seq_show()
1219 	seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);  in input_handlers_seq_show()
1220 	if (handler->filter)  in input_handlers_seq_show()
1222 	if (handler->legacy_minors)  in input_handlers_seq_show()
1223 		seq_printf(seq, " Minor=%d", handler->minor);  in input_handlers_seq_show()
1255 		return -ENOMEM;  in input_proc_init()
1271 	return -ENOMEM;  in input_proc_init()
1295 			  input_dev->name ? input_dev->name : "");	\
1312 		len += snprintf(buf + len, max(size - len, 0), "%X,", bit);  in input_print_modalias_bits()
1322 		       "input:b%04Xv%04Xp%04Xe%04X-",  in input_print_modalias_parts()
1323 		       id->id.bustype, id->id.vendor,  in input_print_modalias_parts()
1324 		       id->id.product, id->id.version);  in input_print_modalias_parts()
1326 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1327 				'e', id->evbit, 0, EV_MAX);  in input_print_modalias_parts()
1333 	space = max(size - (len + 1), 0);  in input_print_modalias_parts()
1335 	klen = input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1336 				'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);  in input_print_modalias_parts()
1349 		remainder = full_len - len;  in input_print_modalias_parts()
1354 		if (remainder <= space - 3) {  in input_print_modalias_parts()
1360 			for (int i = size - 1 - remainder - 3; i >= 0; i--) {  in input_print_modalias_parts()
1370 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1371 				'r', id->relbit, 0, REL_MAX);  in input_print_modalias_parts()
1372 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1373 				'a', id->absbit, 0, ABS_MAX);  in input_print_modalias_parts()
1374 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1375 				'm', id->mscbit, 0, MSC_MAX);  in input_print_modalias_parts()
1376 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1377 				'l', id->ledbit, 0, LED_MAX);  in input_print_modalias_parts()
1378 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1379 				's', id->sndbit, 0, SND_MAX);  in input_print_modalias_parts()
1380 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1381 				'f', id->ffbit, 0, FF_MAX);  in input_print_modalias_parts()
1382 	len += input_print_modalias_bits(buf + len, size - len,  in input_print_modalias_parts()
1383 				'w', id->swbit, 0, SW_MAX);  in input_print_modalias_parts()
1412 	if (len < PAGE_SIZE - 2)  in input_dev_show_modalias()
1413 		len += snprintf(buf + len, PAGE_SIZE - len, "\n");  in input_dev_show_modalias()
1427 	int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,  in input_dev_show_properties()
1442 	return sysfs_emit(buf, "%d\n", input_dev->inhibited);  in inhibited_show()
1454 		return -EINVAL;  in inhibited_store()
1489 	return sysfs_emit(buf, "%04x\n", input_dev->id.name);		\
1518 	for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {  in input_print_bitmap()
1519 		len += input_bits_to_string(buf + len, max(buf_size - len, 0),  in input_print_bitmap()
1524 				len += snprintf(buf + len, max(buf_size - len, 0), " ");  in input_print_bitmap()
1535 		len += snprintf(buf + len, max(buf_size - len, 0), "\n");  in input_print_bitmap()
1547 				     input_dev->bm##bit, ev##_MAX,	\
1561 INPUT_DEV_CAP_ATTR(SW, sw);
1595 	kfree(dev->poller);  in input_dev_release()
1596 	kfree(dev->absinfo);  in input_dev_release()
1597 	kfree(dev->vals);  in input_dev_release()
1604  * Input uevent interface - loading event handlers based on
1613 		return -ENOMEM;  in input_add_uevent_bm_var()
1615 	len = input_print_bitmap(&env->buf[env->buflen - 1],  in input_add_uevent_bm_var()
1616 				 sizeof(env->buf) - env->buflen,  in input_add_uevent_bm_var()
1618 	if (len >= (sizeof(env->buf) - env->buflen))  in input_add_uevent_bm_var()
1619 		return -ENOMEM;  in input_add_uevent_bm_var()
1621 	env->buflen += len;  in input_add_uevent_bm_var()
1629  * avoid overflows/-ENOMEM elsewhere. To work around this let's artificially
1634  * SEQNUM=18446744073709551615 - (%llu - 28 bytes)
1638  * 68 bytes total. Allow extra buffer - 96 bytes
1648 		return -ENOMEM;  in input_add_uevent_modalias_var()
1650 	len = input_print_modalias(&env->buf[env->buflen - 1],  in input_add_uevent_modalias_var()
1651 				   (int)sizeof(env->buf) - env->buflen -  in input_add_uevent_modalias_var()
1654 	if (len >= ((int)sizeof(env->buf) - env->buflen -  in input_add_uevent_modalias_var()
1656 		return -ENOMEM;  in input_add_uevent_modalias_var()
1658 	env->buflen += len;  in input_add_uevent_modalias_var()
1688 				dev->id.bustype, dev->id.vendor,  in input_dev_uevent()
1689 				dev->id.product, dev->id.version);  in input_dev_uevent()
1690 	if (dev->name)  in input_dev_uevent()
1691 		INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);  in input_dev_uevent()
1692 	if (dev->phys)  in input_dev_uevent()
1693 		INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);  in input_dev_uevent()
1694 	if (dev->uniq)  in input_dev_uevent()
1695 		INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);  in input_dev_uevent()
1697 	INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);  in input_dev_uevent()
1699 	INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);  in input_dev_uevent()
1700 	if (test_bit(EV_KEY, dev->evbit))  in input_dev_uevent()
1701 		INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);  in input_dev_uevent()
1702 	if (test_bit(EV_REL, dev->evbit))  in input_dev_uevent()
1703 		INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);  in input_dev_uevent()
1704 	if (test_bit(EV_ABS, dev->evbit))  in input_dev_uevent()
1705 		INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);  in input_dev_uevent()
1706 	if (test_bit(EV_MSC, dev->evbit))  in input_dev_uevent()
1707 		INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);  in input_dev_uevent()
1708 	if (test_bit(EV_LED, dev->evbit))  in input_dev_uevent()
1709 		INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);  in input_dev_uevent()
1710 	if (test_bit(EV_SND, dev->evbit))  in input_dev_uevent()
1711 		INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);  in input_dev_uevent()
1712 	if (test_bit(EV_FF, dev->evbit))  in input_dev_uevent()
1713 		INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);  in input_dev_uevent()
1714 	if (test_bit(EV_SW, dev->evbit))  in input_dev_uevent()
1715 		INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);  in input_dev_uevent()
1727 		if (!test_bit(EV_##type, dev->evbit))			\
1730 		for_each_set_bit(i, dev->bits##bit, type##_CNT) {	\
1731 			active = test_bit(i, dev->bits);		\
1735 			dev->event(dev, EV_##type, i, on ? active : 0);	\
1741 	if (!dev->event)  in input_dev_toggle()
1747 	if (activate && test_bit(EV_REP, dev->evbit)) {  in input_dev_toggle()
1748 		dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);  in input_dev_toggle()
1749 		dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);  in input_dev_toggle()
1754  * input_reset_device() - reset/restore the state of input device
1763 	guard(mutex)(&dev->mutex);  in input_reset_device()
1764 	guard(spinlock_irqsave)(&dev->event_lock);  in input_reset_device()
1774 	guard(mutex)(&dev->mutex);  in input_inhibit_device()
1776 	if (dev->inhibited)  in input_inhibit_device()
1779 	if (dev->users) {  in input_inhibit_device()
1780 		if (dev->close)  in input_inhibit_device()
1781 			dev->close(dev);  in input_inhibit_device()
1782 		if (dev->poller)  in input_inhibit_device()
1783 			input_dev_poller_stop(dev->poller);  in input_inhibit_device()
1786 	scoped_guard(spinlock_irq, &dev->event_lock) {  in input_inhibit_device()
1793 	dev->inhibited = true;  in input_inhibit_device()
1802 	guard(mutex)(&dev->mutex);  in input_uninhibit_device()
1804 	if (!dev->inhibited)  in input_uninhibit_device()
1807 	if (dev->users) {  in input_uninhibit_device()
1808 		if (dev->open) {  in input_uninhibit_device()
1809 			error = dev->open(dev);  in input_uninhibit_device()
1813 		if (dev->poller)  in input_uninhibit_device()
1814 			input_dev_poller_start(dev->poller);  in input_uninhibit_device()
1817 	dev->inhibited = false;  in input_uninhibit_device()
1819 	scoped_guard(spinlock_irq, &dev->event_lock)  in input_uninhibit_device()
1829 	guard(spinlock_irq)(&input_dev->event_lock);  in input_dev_suspend()
1848 	guard(spinlock_irq)(&input_dev->event_lock);  in input_dev_resume()
1860 	guard(spinlock_irq)(&input_dev->event_lock);  in input_dev_freeze()
1876 	guard(spinlock_irq)(&input_dev->event_lock);  in input_dev_poweroff()
1911  * input_allocate_device - allocate memory for new input device
1921 	static atomic_t input_no = ATOMIC_INIT(-1);  in input_allocate_device()
1933 	dev->max_vals = 10;  in input_allocate_device()
1934 	dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);  in input_allocate_device()
1935 	if (!dev->vals) {  in input_allocate_device()
1940 	mutex_init(&dev->mutex);  in input_allocate_device()
1941 	spin_lock_init(&dev->event_lock);  in input_allocate_device()
1942 	timer_setup(&dev->timer, NULL, 0);  in input_allocate_device()
1943 	INIT_LIST_HEAD(&dev->h_list);  in input_allocate_device()
1944 	INIT_LIST_HEAD(&dev->node);  in input_allocate_device()
1946 	dev->dev.type = &input_dev_type;  in input_allocate_device()
1947 	dev->dev.class = &input_class;  in input_allocate_device()
1948 	device_initialize(&dev->dev);  in input_allocate_device()
1955 	dev_set_name(&dev->dev, "input%lu",  in input_allocate_device()
1972 	return devres->input == data;  in devm_input_device_match()
1978 	struct input_dev *input = devres->input;  in devm_input_device_release()
1981 		__func__, dev_name(&input->dev));  in devm_input_device_release()
1986  * devm_input_allocate_device - allocate managed input device
1991  * Managed input devices do not need to be explicitly unregistered or
1993  * its driver (or binding fails). Once managed input device is allocated,
1996  * variants, regular ones work with both managed and unmanaged devices,
1997  * should you need them. In most cases however, managed input device need
2019 	input->dev.parent = dev;  in devm_input_allocate_device()
2020 	input->devres_managed = true;  in devm_input_allocate_device()
2022 	devres->input = input;  in devm_input_allocate_device()
2030  * input_free_device - free memory occupied by input_dev structure
2046 		if (dev->devres_managed)  in input_free_device()
2047 			WARN_ON(devres_destroy(dev->dev.parent,  in input_free_device()
2057  * input_set_timestamp - set timestamp for input events
2072 	dev->timestamp[INPUT_CLK_MONO] = timestamp;  in input_set_timestamp()
2073 	dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp);  in input_set_timestamp()
2074 	dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp,  in input_set_timestamp()
2080  * input_get_timestamp - get timestamp for input events
2083  * A valid timestamp is a timestamp of non-zero value.
2089 	if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp))  in input_get_timestamp()
2092 	return dev->timestamp;  in input_get_timestamp()
2097  * input_set_capability - mark device as capable of a certain event
2103  * bitmap the function also adjusts dev->evbit.
2117 		__set_bit(code, dev->keybit);  in input_set_capability()
2121 		__set_bit(code, dev->relbit);  in input_set_capability()
2126 		__set_bit(code, dev->absbit);  in input_set_capability()
2130 		__set_bit(code, dev->mscbit);  in input_set_capability()
2134 		__set_bit(code, dev->swbit);  in input_set_capability()
2138 		__set_bit(code, dev->ledbit);  in input_set_capability()
2142 		__set_bit(code, dev->sndbit);  in input_set_capability()
2146 		__set_bit(code, dev->ffbit);  in input_set_capability()
2159 	__set_bit(type, dev->evbit);  in input_set_capability()
2169 	if (dev->mt) {  in input_estimate_events_per_packet()
2170 		mt_slots = dev->mt->num_slots;  in input_estimate_events_per_packet()
2171 	} else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {  in input_estimate_events_per_packet()
2172 		mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -  in input_estimate_events_per_packet()
2173 			   dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1;  in input_estimate_events_per_packet()
2175 	} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {  in input_estimate_events_per_packet()
2183 	if (test_bit(EV_ABS, dev->evbit))  in input_estimate_events_per_packet()
2184 		for_each_set_bit(i, dev->absbit, ABS_CNT)  in input_estimate_events_per_packet()
2187 	if (test_bit(EV_REL, dev->evbit))  in input_estimate_events_per_packet()
2188 		events += bitmap_weight(dev->relbit, REL_CNT);  in input_estimate_events_per_packet()
2198 		if (!test_bit(EV_##type, dev->evbit))			\
2199 			memset(dev->bits##bit, 0,			\
2200 				sizeof(dev->bits##bit));		\
2212 	INPUT_CLEANSE_BITMASK(dev, SW, sw);  in input_cleanse_bitmasks()
2222 		list_for_each_entry_safe(handle, next, &dev->h_list, d_node)  in __input_unregister_device()
2223 			handle->handler->disconnect(handle);  in __input_unregister_device()
2224 		WARN_ON(!list_empty(&dev->h_list));  in __input_unregister_device()
2226 		del_timer_sync(&dev->timer);  in __input_unregister_device()
2227 		list_del_init(&dev->node);  in __input_unregister_device()
2232 	device_del(&dev->dev);  in __input_unregister_device()
2238 	struct input_dev *input = devres->input;  in devm_input_device_unregister()
2241 		__func__, dev_name(&input->dev));  in devm_input_device_unregister()
2247  * dev->event_lock here to avoid racing with input_event
2254 	guard(spinlock_irqsave)(&dev->event_lock);  in input_repeat_key()
2256 	if (!dev->inhibited &&  in input_repeat_key()
2257 	    test_bit(dev->repeat_key, dev->key) &&  in input_repeat_key()
2258 	    is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {  in input_repeat_key()
2261 		input_handle_event(dev, EV_KEY, dev->repeat_key, 2);  in input_repeat_key()
2264 		if (dev->rep[REP_PERIOD])  in input_repeat_key()
2265 			mod_timer(&dev->timer, jiffies +  in input_repeat_key()
2266 					msecs_to_jiffies(dev->rep[REP_PERIOD]));  in input_repeat_key()
2271  * input_enable_softrepeat - enable software autorepeat
2280 	dev->timer.function = input_repeat_key;  in input_enable_softrepeat()
2281 	dev->rep[REP_DELAY] = delay;  in input_enable_softrepeat()
2282 	dev->rep[REP_PERIOD] = period;  in input_enable_softrepeat()
2288 	lockdep_assert_held(&dev->mutex);  in input_device_enabled()
2290 	return !dev->inhibited && dev->users > 0;  in input_device_enabled()
2301 	if (dev->hint_events_per_packet < packet_size)  in input_device_tune_vals()
2302 		dev->hint_events_per_packet = packet_size;  in input_device_tune_vals()
2304 	max_vals = dev->hint_events_per_packet + 2;  in input_device_tune_vals()
2305 	if (dev->max_vals >= max_vals)  in input_device_tune_vals()
2310 		return -ENOMEM;  in input_device_tune_vals()
2312 	scoped_guard(spinlock_irq, &dev->event_lock) {  in input_device_tune_vals()
2313 		dev->max_vals = max_vals;  in input_device_tune_vals()
2314 		swap(dev->vals, vals);  in input_device_tune_vals()
2324  * input_register_device - register device with input core
2335  * Note that this function is also used to register managed input devices
2336  * (ones allocated with devm_input_allocate_device()). Such managed input
2339  * that tear down of managed input devices is internally a 2-step process:
2340  * registered managed input device is first unregistered, but stays in
2342  * not be delivered anywhere). The freeing of managed input device will
2353 	if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {  in input_register_device()
2354 		dev_err(&dev->dev,  in input_register_device()
2355 			"Absolute device without dev->absinfo, refusing to register\n");  in input_register_device()
2356 		return -EINVAL;  in input_register_device()
2359 	if (dev->devres_managed) {  in input_register_device()
2363 			return -ENOMEM;  in input_register_device()
2365 		devres->input = dev;  in input_register_device()
2369 	__set_bit(EV_SYN, dev->evbit);  in input_register_device()
2372 	__clear_bit(KEY_RESERVED, dev->keybit);  in input_register_device()
2374 	/* Make sure that bitmasks not mentioned in dev->evbit are clean. */  in input_register_device()
2382 	 * If delay and period are pre-set by the driver, then autorepeating  in input_register_device()
2385 	if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])  in input_register_device()
2388 	if (!dev->getkeycode)  in input_register_device()
2389 		dev->getkeycode = input_default_getkeycode;  in input_register_device()
2391 	if (!dev->setkeycode)  in input_register_device()
2392 		dev->setkeycode = input_default_setkeycode;  in input_register_device()
2394 	if (dev->poller)  in input_register_device()
2395 		input_dev_poller_finalize(dev->poller);  in input_register_device()
2397 	error = device_add(&dev->dev);  in input_register_device()
2401 	path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);  in input_register_device()
2403 		dev->name ? dev->name : "Unspecified device",  in input_register_device()
2407 	error = -EINTR;  in input_register_device()
2409 		list_add_tail(&dev->node, &input_dev_list);  in input_register_device()
2417 	if (dev->devres_managed) {  in input_register_device()
2418 		dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",  in input_register_device()
2419 			__func__, dev_name(&dev->dev));  in input_register_device()
2420 		devres_add(dev->dev.parent, devres);  in input_register_device()
2425 	device_del(&dev->dev);  in input_register_device()
2433  * input_unregister_device - unregister previously registered device
2441 	if (dev->devres_managed) {  in input_unregister_device()
2442 		WARN_ON(devres_destroy(dev->dev.parent,  in input_unregister_device()
2462 	if (handler->filter)  in input_handler_check_methods()
2464 	if (handler->events)  in input_handler_check_methods()
2466 	if (handler->event)  in input_handler_check_methods()
2471 		       __func__, handler->name);  in input_handler_check_methods()
2472 		return -EINVAL;  in input_handler_check_methods()
2479  * input_register_handler - register a new input handler
2495 	scoped_cond_guard(mutex_intr, return -EINTR, &input_mutex) {  in input_register_handler()
2496 		INIT_LIST_HEAD(&handler->h_list);  in input_register_handler()
2498 		list_add_tail(&handler->node, &input_handler_list);  in input_register_handler()
2511  * input_unregister_handler - unregisters an input handler
2523 	list_for_each_entry_safe(handle, next, &handler->h_list, h_node)  in input_unregister_handler()
2524 		handler->disconnect(handle);  in input_unregister_handler()
2525 	WARN_ON(!list_empty(&handler->h_list));  in input_unregister_handler()
2527 	list_del_init(&handler->node);  in input_unregister_handler()
2534  * input_handler_for_each_handle - handle iterator
2540  * it @data and stop when @fn returns a non-zero value. The function is
2553 	list_for_each_entry_rcu(handle, &handler->h_list, h_node) {  in input_handler_for_each_handle()
2565  * invokes handler->event() method for each event one by one.
2571 	struct input_handler *handler = handle->handler;  in input_handle_events_default()
2575 		handler->event(handle, v->type, v->code, v->value);  in input_handle_events_default()
2582  * handler->filter() method for each event one by one and removes events
2589 	struct input_handler *handler = handle->handler;  in input_handle_events_filter()
2594 		if (handler->filter(handle, v->type, v->code, v->value))  in input_handle_events_filter()
2601 	return end - vals;  in input_handle_events_filter()
2615  * Sets up appropriate handle->event_handler based on the input_handler
2620 	struct input_handler *handler = handle->handler;  in input_handle_setup_event_handler()
2622 	if (handler->filter)  in input_handle_setup_event_handler()
2623 		handle->handle_events = input_handle_events_filter;  in input_handle_setup_event_handler()
2624 	else if (handler->event)  in input_handle_setup_event_handler()
2625 		handle->handle_events = input_handle_events_default;  in input_handle_setup_event_handler()
2626 	else if (handler->events)  in input_handle_setup_event_handler()
2627 		handle->handle_events = handler->events;  in input_handle_setup_event_handler()
2629 		handle->handle_events = input_handle_events_null;  in input_handle_setup_event_handler()
2633  * input_register_handle - register a new input handle
2645 	struct input_handler *handler = handle->handler;  in input_register_handle()
2646 	struct input_dev *dev = handle->dev;  in input_register_handle()
2650 	 * We take dev->mutex here to prevent race with  in input_register_handle()
2653 	scoped_cond_guard(mutex_intr, return -EINTR, &dev->mutex) {  in input_register_handle()
2658 		if (handler->filter)  in input_register_handle()
2659 			list_add_rcu(&handle->d_node, &dev->h_list);  in input_register_handle()
2661 			list_add_tail_rcu(&handle->d_node, &dev->h_list);  in input_register_handle()
2665 	 * Since we are supposed to be called from ->connect()  in input_register_handle()
2666 	 * which is mutually exclusive with ->disconnect()  in input_register_handle()
2670 	list_add_tail_rcu(&handle->h_node, &handler->h_list);  in input_register_handle()
2672 	if (handler->start)  in input_register_handle()
2673 		handler->start(handle);  in input_register_handle()
2680  * input_unregister_handle - unregister an input handle
2691 	struct input_dev *dev = handle->dev;  in input_unregister_handle()
2693 	list_del_rcu(&handle->h_node);  in input_unregister_handle()
2696 	 * Take dev->mutex to prevent race with input_release_device().  in input_unregister_handle()
2698 	scoped_guard(mutex, &dev->mutex)  in input_unregister_handle()
2699 		list_del_rcu(&handle->d_node);  in input_unregister_handle()
2706  * input_get_new_minor - allocates a new input minor number
2720 	 * This function should be called from input handler's ->connect()  in input_get_new_minor()
2726 					    legacy_base + legacy_num - 1,  in input_get_new_minor()
2733 			       INPUT_MAX_CHAR_DEVICES - 1, GFP_KERNEL);  in input_get_new_minor()
2738  * input_free_minor - release previously allocated minor