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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);
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/input-polldev.h>
18
19MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
20MODULE_DESCRIPTION("Generic implementation of a polled input device");
21MODULE_LICENSE("GPL v2");
22MODULE_VERSION("0.1");
23
24static void input_polldev_queue_work(struct input_polled_dev *dev)
25{
26 unsigned long delay;
27
28 delay = msecs_to_jiffies(dev->poll_interval);
29 if (delay >= HZ)
30 delay = round_jiffies_relative(delay);
31
32 queue_delayed_work(system_freezable_wq, &dev->work, delay);
33}
34
35static void input_polled_device_work(struct work_struct *work)
36{
37 struct input_polled_dev *dev =
38 container_of(work, struct input_polled_dev, work.work);
39
40 dev->poll(dev);
41 input_polldev_queue_work(dev);
42}
43
44static int input_open_polled_device(struct input_dev *input)
45{
46 struct input_polled_dev *dev = input_get_drvdata(input);
47
48 if (dev->open)
49 dev->open(dev);
50
51 /* Only start polling if polling is enabled */
52 if (dev->poll_interval > 0)
53 queue_delayed_work(system_freezable_wq, &dev->work, 0);
54
55 return 0;
56}
57
58static void input_close_polled_device(struct input_dev *input)
59{
60 struct input_polled_dev *dev = input_get_drvdata(input);
61
62 cancel_delayed_work_sync(&dev->work);
63
64 if (dev->close)
65 dev->close(dev);
66}
67
68/* SYSFS interface */
69
70static ssize_t input_polldev_get_poll(struct device *dev,
71 struct device_attribute *attr, char *buf)
72{
73 struct input_polled_dev *polldev = dev_get_drvdata(dev);
74
75 return sprintf(buf, "%d\n", polldev->poll_interval);
76}
77
78static ssize_t input_polldev_set_poll(struct device *dev,
79 struct device_attribute *attr, const char *buf,
80 size_t count)
81{
82 struct input_polled_dev *polldev = dev_get_drvdata(dev);
83 struct input_dev *input = polldev->input;
84 unsigned long interval;
85
86 if (strict_strtoul(buf, 0, &interval))
87 return -EINVAL;
88
89 if (interval < polldev->poll_interval_min)
90 return -EINVAL;
91
92 if (interval > polldev->poll_interval_max)
93 return -EINVAL;
94
95 mutex_lock(&input->mutex);
96
97 polldev->poll_interval = interval;
98
99 if (input->users) {
100 cancel_delayed_work_sync(&polldev->work);
101 if (polldev->poll_interval > 0)
102 input_polldev_queue_work(polldev);
103 }
104
105 mutex_unlock(&input->mutex);
106
107 return count;
108}
109
110static DEVICE_ATTR(poll, S_IRUGO | S_IWUSR, input_polldev_get_poll,
111 input_polldev_set_poll);
112
113
114static ssize_t input_polldev_get_max(struct device *dev,
115 struct device_attribute *attr, char *buf)
116{
117 struct input_polled_dev *polldev = dev_get_drvdata(dev);
118
119 return sprintf(buf, "%d\n", polldev->poll_interval_max);
120}
121
122static DEVICE_ATTR(max, S_IRUGO, input_polldev_get_max, NULL);
123
124static ssize_t input_polldev_get_min(struct device *dev,
125 struct device_attribute *attr, char *buf)
126{
127 struct input_polled_dev *polldev = dev_get_drvdata(dev);
128
129 return sprintf(buf, "%d\n", polldev->poll_interval_min);
130}
131
132static DEVICE_ATTR(min, S_IRUGO, input_polldev_get_min, NULL);
133
134static struct attribute *sysfs_attrs[] = {
135 &dev_attr_poll.attr,
136 &dev_attr_max.attr,
137 &dev_attr_min.attr,
138 NULL
139};
140
141static struct attribute_group input_polldev_attribute_group = {
142 .attrs = sysfs_attrs
143};
144
145/**
146 * input_allocate_polled_device - allocate memory for polled device
147 *
148 * The function allocates memory for a polled device and also
149 * for an input device associated with this polled device.
150 */
151struct input_polled_dev *input_allocate_polled_device(void)
152{
153 struct input_polled_dev *dev;
154
155 dev = kzalloc(sizeof(struct input_polled_dev), GFP_KERNEL);
156 if (!dev)
157 return NULL;
158
159 dev->input = input_allocate_device();
160 if (!dev->input) {
161 kfree(dev);
162 return NULL;
163 }
164
165 return dev;
166}
167EXPORT_SYMBOL(input_allocate_polled_device);
168
169/**
170 * input_free_polled_device - free memory allocated for polled device
171 * @dev: device to free
172 *
173 * The function frees memory allocated for polling device and drops
174 * reference to the associated input device.
175 */
176void input_free_polled_device(struct input_polled_dev *dev)
177{
178 if (dev) {
179 input_free_device(dev->input);
180 kfree(dev);
181 }
182}
183EXPORT_SYMBOL(input_free_polled_device);
184
185/**
186 * input_register_polled_device - register polled device
187 * @dev: device to register
188 *
189 * The function registers previously initialized polled input device
190 * with input layer. The device should be allocated with call to
191 * input_allocate_polled_device(). Callers should also set up poll()
192 * method and set up capabilities (id, name, phys, bits) of the
193 * corresponding input_dev structure.
194 */
195int input_register_polled_device(struct input_polled_dev *dev)
196{
197 struct input_dev *input = dev->input;
198 int error;
199
200 input_set_drvdata(input, dev);
201 INIT_DELAYED_WORK(&dev->work, input_polled_device_work);
202 if (!dev->poll_interval)
203 dev->poll_interval = 500;
204 if (!dev->poll_interval_max)
205 dev->poll_interval_max = dev->poll_interval;
206 input->open = input_open_polled_device;
207 input->close = input_close_polled_device;
208
209 error = input_register_device(input);
210 if (error)
211 return error;
212
213 error = sysfs_create_group(&input->dev.kobj,
214 &input_polldev_attribute_group);
215 if (error) {
216 input_unregister_device(input);
217 return error;
218 }
219
220 /*
221 * Take extra reference to the underlying input device so
222 * that it survives call to input_unregister_polled_device()
223 * and is deleted only after input_free_polled_device()
224 * has been invoked. This is needed to ease task of freeing
225 * sparse keymaps.
226 */
227 input_get_device(input);
228
229 return 0;
230}
231EXPORT_SYMBOL(input_register_polled_device);
232
233/**
234 * input_unregister_polled_device - unregister polled device
235 * @dev: device to unregister
236 *
237 * The function unregisters previously registered polled input
238 * device from input layer. Polling is stopped and device is
239 * ready to be freed with call to input_free_polled_device().
240 */
241void input_unregister_polled_device(struct input_polled_dev *dev)
242{
243 sysfs_remove_group(&dev->input->dev.kobj,
244 &input_polldev_attribute_group);
245
246 input_unregister_device(dev->input);
247}
248EXPORT_SYMBOL(input_unregister_polled_device);