1 // SPDX-License-Identifier: GPL-2.0-only
3  * Support for polling mode for input devices.
7 #include <linux/input.h>
13 #include "input-poller.h"
22 	struct input_dev *input;  member
30 	delay = msecs_to_jiffies(poller->poll_interval);  in input_dev_poller_queue_work()
34 	queue_delayed_work(system_freezable_wq, &poller->work, delay);  in input_dev_poller_queue_work()
42 	poller->poll(poller->input);  in input_dev_poller_work()
48 	if (!poller->poll_interval)  in input_dev_poller_finalize()
49 		poller->poll_interval = 500;  in input_dev_poller_finalize()
50 	if (!poller->poll_interval_max)  in input_dev_poller_finalize()
51 		poller->poll_interval_max = poller->poll_interval;  in input_dev_poller_finalize()
56 	/* Only start polling if polling is enabled */  in input_dev_poller_start()
57 	if (poller->poll_interval > 0) {  in input_dev_poller_start()
58 		poller->poll(poller->input);  in input_dev_poller_start()
65 	cancel_delayed_work_sync(&poller->work);  in input_dev_poller_stop()
77 		 * printed backtrace as knowing what instance of input  in input_setup_polling()
80 		dev_err(dev->dev.parent ?: &dev->dev,  in input_setup_polling()
82 		return -ENOMEM;  in input_setup_polling()
85 	INIT_DELAYED_WORK(&poller->work, input_dev_poller_work);  in input_setup_polling()
86 	poller->input = dev;  in input_setup_polling()
87 	poller->poll = poll_fn;  in input_setup_polling()
89 	dev->poller = poller;  in input_setup_polling()
96 	if (!dev->poller) {  in input_dev_ensure_poller()
97 		dev_err(dev->dev.parent ?: &dev->dev,  in input_dev_ensure_poller()
108 		dev->poller->poll_interval = interval;  in input_set_poll_interval()
115 		dev->poller->poll_interval_min = interval;  in input_set_min_poll_interval()
122 		dev->poller->poll_interval_max = interval;  in input_set_max_poll_interval()
128 	if (!dev->poller)  in input_get_poll_interval()
129 		return -EINVAL;  in input_get_poll_interval()
131 	return dev->poller->poll_interval;  in input_get_poll_interval()
141 	struct input_dev *input = to_input_dev(dev);  in input_dev_get_poll_interval()  local
143 	return sprintf(buf, "%d\n", input->poller->poll_interval);  in input_dev_get_poll_interval()
150 	struct input_dev *input = to_input_dev(dev);  in input_dev_set_poll_interval()  local
151 	struct input_dev_poller *poller = input->poller;  in input_dev_set_poll_interval()
159 	if (interval < poller->poll_interval_min)  in input_dev_set_poll_interval()
160 		return -EINVAL;  in input_dev_set_poll_interval()
162 	if (interval > poller->poll_interval_max)  in input_dev_set_poll_interval()
163 		return -EINVAL;  in input_dev_set_poll_interval()
165 	mutex_lock(&input->mutex);  in input_dev_set_poll_interval()
167 	poller->poll_interval = interval;  in input_dev_set_poll_interval()
169 	if (input_device_enabled(input)) {  in input_dev_set_poll_interval()
170 		cancel_delayed_work_sync(&poller->work);  in input_dev_set_poll_interval()
171 		if (poller->poll_interval > 0)  in input_dev_set_poll_interval()
175 	mutex_unlock(&input->mutex);  in input_dev_set_poll_interval()
186 	struct input_dev *input = to_input_dev(dev);  in input_dev_get_poll_max()  local
188 	return sprintf(buf, "%d\n", input->poller->poll_interval_max);  in input_dev_get_poll_max()
196 	struct input_dev *input = to_input_dev(dev);  in input_dev_get_poll_min()  local
198 	return sprintf(buf, "%d\n", input->poller->poll_interval_min);  in input_dev_get_poll_min()
207 	struct input_dev *input = to_input_dev(dev);  in input_poller_attrs_visible()  local
209 	return input->poller ? attr->mode : 0;  in input_poller_attrs_visible()