1/*
2 * Generic implementation of a polled input device
3
4 * Copyright (c) 2007 Dmitry Torokhov
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/jiffies.h>
14#include <linux/slab.h>
15#include <linux/mutex.h>
16#include <linux/workqueue.h>
17#include <linux/module.h>
18#include <linux/input-polldev.h>
19
20MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
21MODULE_DESCRIPTION("Generic implementation of a polled input device");
22MODULE_LICENSE("GPL v2");
23MODULE_VERSION("0.1");
24
25static void input_polldev_queue_work(struct input_polled_dev *dev)
26{
27	unsigned long delay;
28
29	delay = msecs_to_jiffies(dev->poll_interval);
30	if (delay >= HZ)
31		delay = round_jiffies_relative(delay);
32
33	queue_delayed_work(system_freezable_wq, &dev->work, delay);
34}
35
36static void input_polled_device_work(struct work_struct *work)
37{
38	struct input_polled_dev *dev =
39		container_of(work, struct input_polled_dev, work.work);
40
41	dev->poll(dev);
42	input_polldev_queue_work(dev);
43}
44
45static int input_open_polled_device(struct input_dev *input)
46{
47	struct input_polled_dev *dev = input_get_drvdata(input);
48
49	if (dev->open)
50		dev->open(dev);
51
52	/* Only start polling if polling is enabled */
53	if (dev->poll_interval > 0) {
54		dev->poll(dev);
55		input_polldev_queue_work(dev);
56	}
57
58	return 0;
59}
60
61static void input_close_polled_device(struct input_dev *input)
62{
63	struct input_polled_dev *dev = input_get_drvdata(input);
64
65	cancel_delayed_work_sync(&dev->work);
66
67	if (dev->close)
68		dev->close(dev);
69}
70
71/* SYSFS interface */
72
73static ssize_t input_polldev_get_poll(struct device *dev,
74				      struct device_attribute *attr, char *buf)
75{
76	struct input_polled_dev *polldev = dev_get_drvdata(dev);
77
78	return sprintf(buf, "%d\n", polldev->poll_interval);
79}
80
81static ssize_t input_polldev_set_poll(struct device *dev,
82				struct device_attribute *attr, const char *buf,
83				size_t count)
84{
85	struct input_polled_dev *polldev = dev_get_drvdata(dev);
86	struct input_dev *input = polldev->input;
87	unsigned int interval;
88	int err;
89
90	err = kstrtouint(buf, 0, &interval);
91	if (err)
92		return err;
93
94	if (interval < polldev->poll_interval_min)
95		return -EINVAL;
96
97	if (interval > polldev->poll_interval_max)
98		return -EINVAL;
99
100	mutex_lock(&input->mutex);
101
102	polldev->poll_interval = interval;
103
104	if (input->users) {
105		cancel_delayed_work_sync(&polldev->work);
106		if (polldev->poll_interval > 0)
107			input_polldev_queue_work(polldev);
108	}
109
110	mutex_unlock(&input->mutex);
111
112	return count;
113}
114
115static DEVICE_ATTR(poll, S_IRUGO | S_IWUSR, input_polldev_get_poll,
116					    input_polldev_set_poll);
117
118
119static ssize_t input_polldev_get_max(struct device *dev,
120				     struct device_attribute *attr, char *buf)
121{
122	struct input_polled_dev *polldev = dev_get_drvdata(dev);
123
124	return sprintf(buf, "%d\n", polldev->poll_interval_max);
125}
126
127static DEVICE_ATTR(max, S_IRUGO, input_polldev_get_max, NULL);
128
129static ssize_t input_polldev_get_min(struct device *dev,
130				     struct device_attribute *attr, char *buf)
131{
132	struct input_polled_dev *polldev = dev_get_drvdata(dev);
133
134	return sprintf(buf, "%d\n", polldev->poll_interval_min);
135}
136
137static DEVICE_ATTR(min, S_IRUGO, input_polldev_get_min, NULL);
138
139static struct attribute *sysfs_attrs[] = {
140	&dev_attr_poll.attr,
141	&dev_attr_max.attr,
142	&dev_attr_min.attr,
143	NULL
144};
145
146static struct attribute_group input_polldev_attribute_group = {
147	.attrs = sysfs_attrs
148};
149
150static const struct attribute_group *input_polldev_attribute_groups[] = {
151	&input_polldev_attribute_group,
152	NULL
153};
154
155/**
156 * input_allocate_polled_device - allocate memory for polled device
157 *
158 * The function allocates memory for a polled device and also
159 * for an input device associated with this polled device.
160 */
161struct input_polled_dev *input_allocate_polled_device(void)
162{
163	struct input_polled_dev *dev;
164
165	dev = kzalloc(sizeof(struct input_polled_dev), GFP_KERNEL);
166	if (!dev)
167		return NULL;
168
169	dev->input = input_allocate_device();
170	if (!dev->input) {
171		kfree(dev);
172		return NULL;
173	}
174
175	return dev;
176}
177EXPORT_SYMBOL(input_allocate_polled_device);
178
179struct input_polled_devres {
180	struct input_polled_dev *polldev;
181};
182
183static int devm_input_polldev_match(struct device *dev, void *res, void *data)
184{
185	struct input_polled_devres *devres = res;
186
187	return devres->polldev == data;
188}
189
190static void devm_input_polldev_release(struct device *dev, void *res)
191{
192	struct input_polled_devres *devres = res;
193	struct input_polled_dev *polldev = devres->polldev;
194
195	dev_dbg(dev, "%s: dropping reference/freeing %s\n",
196		__func__, dev_name(&polldev->input->dev));
197
198	input_put_device(polldev->input);
199	kfree(polldev);
200}
201
202static void devm_input_polldev_unregister(struct device *dev, void *res)
203{
204	struct input_polled_devres *devres = res;
205	struct input_polled_dev *polldev = devres->polldev;
206
207	dev_dbg(dev, "%s: unregistering device %s\n",
208		__func__, dev_name(&polldev->input->dev));
209	input_unregister_device(polldev->input);
210
211	/*
212	 * Note that we are still holding extra reference to the input
213	 * device so it will stick around until devm_input_polldev_release()
214	 * is called.
215	 */
216}
217
218/**
219 * devm_input_allocate_polled_device - allocate managed polled device
220 * @dev: device owning the polled device being created
221 *
222 * Returns prepared &struct input_polled_dev or %NULL.
223 *
224 * Managed polled input devices do not need to be explicitly unregistered
225 * or freed as it will be done automatically when owner device unbinds
226 * from * its driver (or binding fails). Once such managed polled device
227 * is allocated, it is ready to be set up and registered in the same
228 * fashion as regular polled input devices (using
229 * input_register_polled_device() function).
230 *
231 * If you want to manually unregister and free such managed polled devices,
232 * it can be still done by calling input_unregister_polled_device() and
233 * input_free_polled_device(), although it is rarely needed.
234 *
235 * NOTE: the owner device is set up as parent of input device and users
236 * should not override it.
237 */
238struct input_polled_dev *devm_input_allocate_polled_device(struct device *dev)
239{
240	struct input_polled_dev *polldev;
241	struct input_polled_devres *devres;
242
243	devres = devres_alloc(devm_input_polldev_release, sizeof(*devres),
244			      GFP_KERNEL);
245	if (!devres)
246		return NULL;
247
248	polldev = input_allocate_polled_device();
249	if (!polldev) {
250		devres_free(devres);
251		return NULL;
252	}
253
254	polldev->input->dev.parent = dev;
255	polldev->devres_managed = true;
256
257	devres->polldev = polldev;
258	devres_add(dev, devres);
259
260	return polldev;
261}
262EXPORT_SYMBOL(devm_input_allocate_polled_device);
263
264/**
265 * input_free_polled_device - free memory allocated for polled device
266 * @dev: device to free
267 *
268 * The function frees memory allocated for polling device and drops
269 * reference to the associated input device.
270 */
271void input_free_polled_device(struct input_polled_dev *dev)
272{
273	if (dev) {
274		if (dev->devres_managed)
275			WARN_ON(devres_destroy(dev->input->dev.parent,
276						devm_input_polldev_release,
277						devm_input_polldev_match,
278						dev));
279		input_put_device(dev->input);
280		kfree(dev);
281	}
282}
283EXPORT_SYMBOL(input_free_polled_device);
284
285/**
286 * input_register_polled_device - register polled device
287 * @dev: device to register
288 *
289 * The function registers previously initialized polled input device
290 * with input layer. The device should be allocated with call to
291 * input_allocate_polled_device(). Callers should also set up poll()
292 * method and set up capabilities (id, name, phys, bits) of the
293 * corresponding input_dev structure.
294 */
295int input_register_polled_device(struct input_polled_dev *dev)
296{
297	struct input_polled_devres *devres = NULL;
298	struct input_dev *input = dev->input;
299	int error;
300
301	if (dev->devres_managed) {
302		devres = devres_alloc(devm_input_polldev_unregister,
303				      sizeof(*devres), GFP_KERNEL);
304		if (!devres)
305			return -ENOMEM;
306
307		devres->polldev = dev;
308	}
309
310	input_set_drvdata(input, dev);
311	INIT_DELAYED_WORK(&dev->work, input_polled_device_work);
312
313	if (!dev->poll_interval)
314		dev->poll_interval = 500;
315	if (!dev->poll_interval_max)
316		dev->poll_interval_max = dev->poll_interval;
317
318	input->open = input_open_polled_device;
319	input->close = input_close_polled_device;
320
321	input->dev.groups = input_polldev_attribute_groups;
322
323	error = input_register_device(input);
324	if (error) {
325		devres_free(devres);
326		return error;
327	}
328
329	/*
330	 * Take extra reference to the underlying input device so
331	 * that it survives call to input_unregister_polled_device()
332	 * and is deleted only after input_free_polled_device()
333	 * has been invoked. This is needed to ease task of freeing
334	 * sparse keymaps.
335	 */
336	input_get_device(input);
337
338	if (dev->devres_managed) {
339		dev_dbg(input->dev.parent, "%s: registering %s with devres.\n",
340			__func__, dev_name(&input->dev));
341		devres_add(input->dev.parent, devres);
342	}
343
344	return 0;
345}
346EXPORT_SYMBOL(input_register_polled_device);
347
348/**
349 * input_unregister_polled_device - unregister polled device
350 * @dev: device to unregister
351 *
352 * The function unregisters previously registered polled input
353 * device from input layer. Polling is stopped and device is
354 * ready to be freed with call to input_free_polled_device().
355 */
356void input_unregister_polled_device(struct input_polled_dev *dev)
357{
358	if (dev->devres_managed)
359		WARN_ON(devres_destroy(dev->input->dev.parent,
360					devm_input_polldev_unregister,
361					devm_input_polldev_match,
362					dev));
363
364	input_unregister_device(dev->input);
365}
366EXPORT_SYMBOL(input_unregister_polled_device);
367