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26#include <linux/input.h>
27#include <linux/module.h>
28#include <linux/mutex.h>
29#include <linux/sched.h>
30#include <linux/slab.h>
31
32
33
34
35
36static int check_effect_access(struct ff_device *ff, int effect_id,
37 struct file *file)
38{
39 if (effect_id < 0 || effect_id >= ff->max_effects ||
40 !ff->effect_owners[effect_id])
41 return -EINVAL;
42
43 if (file && ff->effect_owners[effect_id] != file)
44 return -EACCES;
45
46 return 0;
47}
48
49
50
51
52static inline int check_effects_compatible(struct ff_effect *e1,
53 struct ff_effect *e2)
54{
55 return e1->type == e2->type &&
56 (e1->type != FF_PERIODIC ||
57 e1->u.periodic.waveform == e2->u.periodic.waveform);
58}
59
60
61
62
63static int compat_effect(struct ff_device *ff, struct ff_effect *effect)
64{
65 int magnitude;
66
67 switch (effect->type) {
68 case FF_RUMBLE:
69 if (!test_bit(FF_PERIODIC, ff->ffbit))
70 return -EINVAL;
71
72
73
74
75
76 magnitude = effect->u.rumble.strong_magnitude / 3 +
77 effect->u.rumble.weak_magnitude / 6;
78
79 effect->type = FF_PERIODIC;
80 effect->u.periodic.waveform = FF_SINE;
81 effect->u.periodic.period = 50;
82 effect->u.periodic.magnitude = max(magnitude, 0x7fff);
83 effect->u.periodic.offset = 0;
84 effect->u.periodic.phase = 0;
85 effect->u.periodic.envelope.attack_length = 0;
86 effect->u.periodic.envelope.attack_level = 0;
87 effect->u.periodic.envelope.fade_length = 0;
88 effect->u.periodic.envelope.fade_level = 0;
89
90 return 0;
91
92 default:
93
94 return 0;
95 }
96}
97
98
99
100
101
102
103
104int input_ff_upload(struct input_dev *dev, struct ff_effect *effect,
105 struct file *file)
106{
107 struct ff_device *ff = dev->ff;
108 struct ff_effect *old;
109 int ret = 0;
110 int id;
111
112 if (!test_bit(EV_FF, dev->evbit))
113 return -ENOSYS;
114
115 if (effect->type < FF_EFFECT_MIN || effect->type > FF_EFFECT_MAX ||
116 !test_bit(effect->type, dev->ffbit)) {
117 dev_dbg(&dev->dev, "invalid or not supported effect type in upload\n");
118 return -EINVAL;
119 }
120
121 if (effect->type == FF_PERIODIC &&
122 (effect->u.periodic.waveform < FF_WAVEFORM_MIN ||
123 effect->u.periodic.waveform > FF_WAVEFORM_MAX ||
124 !test_bit(effect->u.periodic.waveform, dev->ffbit))) {
125 dev_dbg(&dev->dev, "invalid or not supported wave form in upload\n");
126 return -EINVAL;
127 }
128
129 if (!test_bit(effect->type, ff->ffbit)) {
130 ret = compat_effect(ff, effect);
131 if (ret)
132 return ret;
133 }
134
135 mutex_lock(&ff->mutex);
136
137 if (effect->id == -1) {
138 for (id = 0; id < ff->max_effects; id++)
139 if (!ff->effect_owners[id])
140 break;
141
142 if (id >= ff->max_effects) {
143 ret = -ENOSPC;
144 goto out;
145 }
146
147 effect->id = id;
148 old = NULL;
149
150 } else {
151 id = effect->id;
152
153 ret = check_effect_access(ff, id, file);
154 if (ret)
155 goto out;
156
157 old = &ff->effects[id];
158
159 if (!check_effects_compatible(effect, old)) {
160 ret = -EINVAL;
161 goto out;
162 }
163 }
164
165 ret = ff->upload(dev, effect, old);
166 if (ret)
167 goto out;
168
169 spin_lock_irq(&dev->event_lock);
170 ff->effects[id] = *effect;
171 ff->effect_owners[id] = file;
172 spin_unlock_irq(&dev->event_lock);
173
174 out:
175 mutex_unlock(&ff->mutex);
176 return ret;
177}
178EXPORT_SYMBOL_GPL(input_ff_upload);
179
180
181
182
183
184static int erase_effect(struct input_dev *dev, int effect_id,
185 struct file *file)
186{
187 struct ff_device *ff = dev->ff;
188 int error;
189
190 error = check_effect_access(ff, effect_id, file);
191 if (error)
192 return error;
193
194 spin_lock_irq(&dev->event_lock);
195 ff->playback(dev, effect_id, 0);
196 ff->effect_owners[effect_id] = NULL;
197 spin_unlock_irq(&dev->event_lock);
198
199 if (ff->erase) {
200 error = ff->erase(dev, effect_id);
201 if (error) {
202 spin_lock_irq(&dev->event_lock);
203 ff->effect_owners[effect_id] = file;
204 spin_unlock_irq(&dev->event_lock);
205
206 return error;
207 }
208 }
209
210 return 0;
211}
212
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220
221
222
223int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file)
224{
225 struct ff_device *ff = dev->ff;
226 int ret;
227
228 if (!test_bit(EV_FF, dev->evbit))
229 return -ENOSYS;
230
231 mutex_lock(&ff->mutex);
232 ret = erase_effect(dev, effect_id, file);
233 mutex_unlock(&ff->mutex);
234
235 return ret;
236}
237EXPORT_SYMBOL_GPL(input_ff_erase);
238
239
240
241
242static int flush_effects(struct input_dev *dev, struct file *file)
243{
244 struct ff_device *ff = dev->ff;
245 int i;
246
247 dev_dbg(&dev->dev, "flushing now\n");
248
249 mutex_lock(&ff->mutex);
250
251 for (i = 0; i < ff->max_effects; i++)
252 erase_effect(dev, i, file);
253
254 mutex_unlock(&ff->mutex);
255
256 return 0;
257}
258
259
260
261
262
263
264
265
266int input_ff_event(struct input_dev *dev, unsigned int type,
267 unsigned int code, int value)
268{
269 struct ff_device *ff = dev->ff;
270
271 if (type != EV_FF)
272 return 0;
273
274 switch (code) {
275 case FF_GAIN:
276 if (!test_bit(FF_GAIN, dev->ffbit) || value > 0xffffU)
277 break;
278
279 ff->set_gain(dev, value);
280 break;
281
282 case FF_AUTOCENTER:
283 if (!test_bit(FF_AUTOCENTER, dev->ffbit) || value > 0xffffU)
284 break;
285
286 ff->set_autocenter(dev, value);
287 break;
288
289 default:
290 if (check_effect_access(ff, code, NULL) == 0)
291 ff->playback(dev, code, value);
292 break;
293 }
294
295 return 0;
296}
297EXPORT_SYMBOL_GPL(input_ff_event);
298
299
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302
303
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308
309
310int input_ff_create(struct input_dev *dev, unsigned int max_effects)
311{
312 struct ff_device *ff;
313 size_t ff_dev_size;
314 int i;
315
316 if (!max_effects) {
317 dev_err(&dev->dev, "cannot allocate device without any effects\n");
318 return -EINVAL;
319 }
320
321 if (max_effects > FF_MAX_EFFECTS) {
322 dev_err(&dev->dev, "cannot allocate more than FF_MAX_EFFECTS effects\n");
323 return -EINVAL;
324 }
325
326 ff_dev_size = sizeof(struct ff_device) +
327 max_effects * sizeof(struct file *);
328 if (ff_dev_size < max_effects)
329 return -EINVAL;
330
331 ff = kzalloc(ff_dev_size, GFP_KERNEL);
332 if (!ff)
333 return -ENOMEM;
334
335 ff->effects = kcalloc(max_effects, sizeof(struct ff_effect),
336 GFP_KERNEL);
337 if (!ff->effects) {
338 kfree(ff);
339 return -ENOMEM;
340 }
341
342 ff->max_effects = max_effects;
343 mutex_init(&ff->mutex);
344
345 dev->ff = ff;
346 dev->flush = flush_effects;
347 dev->event = input_ff_event;
348 __set_bit(EV_FF, dev->evbit);
349
350
351 for_each_set_bit(i, dev->ffbit, FF_CNT)
352 __set_bit(i, ff->ffbit);
353
354
355 if (test_bit(FF_PERIODIC, ff->ffbit))
356 __set_bit(FF_RUMBLE, dev->ffbit);
357
358 return 0;
359}
360EXPORT_SYMBOL_GPL(input_ff_create);
361
362
363
364
365
366
367
368
369
370void input_ff_destroy(struct input_dev *dev)
371{
372 struct ff_device *ff = dev->ff;
373
374 __clear_bit(EV_FF, dev->evbit);
375 if (ff) {
376 if (ff->destroy)
377 ff->destroy(ff);
378 kfree(ff->private);
379 kfree(ff->effects);
380 kfree(ff);
381 dev->ff = NULL;
382 }
383}
384EXPORT_SYMBOL_GPL(input_ff_destroy);
385