1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/input.h>
17#include <linux/input/sparse-keymap.h>
18#include <linux/module.h>
19#include <linux/slab.h>
20
21MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
22MODULE_DESCRIPTION("Generic support for sparse keymaps");
23MODULE_LICENSE("GPL v2");
24MODULE_VERSION("0.1");
25
26static unsigned int sparse_keymap_get_key_index(struct input_dev *dev,
27 const struct key_entry *k)
28{
29 struct key_entry *key;
30 unsigned int idx = 0;
31
32 for (key = dev->keycode; key->type != KE_END; key++) {
33 if (key->type == KE_KEY) {
34 if (key == k)
35 break;
36 idx++;
37 }
38 }
39
40 return idx;
41}
42
43static struct key_entry *sparse_keymap_entry_by_index(struct input_dev *dev,
44 unsigned int index)
45{
46 struct key_entry *key;
47 unsigned int key_cnt = 0;
48
49 for (key = dev->keycode; key->type != KE_END; key++)
50 if (key->type == KE_KEY)
51 if (key_cnt++ == index)
52 return key;
53
54 return NULL;
55}
56
57
58
59
60
61
62
63
64
65struct key_entry *sparse_keymap_entry_from_scancode(struct input_dev *dev,
66 unsigned int code)
67{
68 struct key_entry *key;
69
70 for (key = dev->keycode; key->type != KE_END; key++)
71 if (code == key->code)
72 return key;
73
74 return NULL;
75}
76EXPORT_SYMBOL(sparse_keymap_entry_from_scancode);
77
78
79
80
81
82
83
84
85
86struct key_entry *sparse_keymap_entry_from_keycode(struct input_dev *dev,
87 unsigned int keycode)
88{
89 struct key_entry *key;
90
91 for (key = dev->keycode; key->type != KE_END; key++)
92 if (key->type == KE_KEY && keycode == key->keycode)
93 return key;
94
95 return NULL;
96}
97EXPORT_SYMBOL(sparse_keymap_entry_from_keycode);
98
99static struct key_entry *sparse_keymap_locate(struct input_dev *dev,
100 const struct input_keymap_entry *ke)
101{
102 struct key_entry *key;
103 unsigned int scancode;
104
105 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
106 key = sparse_keymap_entry_by_index(dev, ke->index);
107 else if (input_scancode_to_scalar(ke, &scancode) == 0)
108 key = sparse_keymap_entry_from_scancode(dev, scancode);
109 else
110 key = NULL;
111
112 return key;
113}
114
115static int sparse_keymap_getkeycode(struct input_dev *dev,
116 struct input_keymap_entry *ke)
117{
118 const struct key_entry *key;
119
120 if (dev->keycode) {
121 key = sparse_keymap_locate(dev, ke);
122 if (key && key->type == KE_KEY) {
123 ke->keycode = key->keycode;
124 if (!(ke->flags & INPUT_KEYMAP_BY_INDEX))
125 ke->index =
126 sparse_keymap_get_key_index(dev, key);
127 ke->len = sizeof(key->code);
128 memcpy(ke->scancode, &key->code, sizeof(key->code));
129 return 0;
130 }
131 }
132
133 return -EINVAL;
134}
135
136static int sparse_keymap_setkeycode(struct input_dev *dev,
137 const struct input_keymap_entry *ke,
138 unsigned int *old_keycode)
139{
140 struct key_entry *key;
141
142 if (dev->keycode) {
143 key = sparse_keymap_locate(dev, ke);
144 if (key && key->type == KE_KEY) {
145 *old_keycode = key->keycode;
146 key->keycode = ke->keycode;
147 set_bit(ke->keycode, dev->keybit);
148 if (!sparse_keymap_entry_from_keycode(dev, *old_keycode))
149 clear_bit(*old_keycode, dev->keybit);
150 return 0;
151 }
152 }
153
154 return -EINVAL;
155}
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170int sparse_keymap_setup(struct input_dev *dev,
171 const struct key_entry *keymap,
172 int (*setup)(struct input_dev *, struct key_entry *))
173{
174 size_t map_size = 1;
175 const struct key_entry *e;
176 struct key_entry *map, *entry;
177 int i;
178 int error;
179
180 for (e = keymap; e->type != KE_END; e++)
181 map_size++;
182
183 map = kcalloc(map_size, sizeof(struct key_entry), GFP_KERNEL);
184 if (!map)
185 return -ENOMEM;
186
187 memcpy(map, keymap, map_size * sizeof(struct key_entry));
188
189 for (i = 0; i < map_size; i++) {
190 entry = &map[i];
191
192 if (setup) {
193 error = setup(dev, entry);
194 if (error)
195 goto err_out;
196 }
197
198 switch (entry->type) {
199 case KE_KEY:
200 __set_bit(EV_KEY, dev->evbit);
201 __set_bit(entry->keycode, dev->keybit);
202 break;
203
204 case KE_SW:
205 case KE_VSW:
206 __set_bit(EV_SW, dev->evbit);
207 __set_bit(entry->sw.code, dev->swbit);
208 break;
209 }
210 }
211
212 if (test_bit(EV_KEY, dev->evbit)) {
213 __set_bit(KEY_UNKNOWN, dev->keybit);
214 __set_bit(EV_MSC, dev->evbit);
215 __set_bit(MSC_SCAN, dev->mscbit);
216 }
217
218 dev->keycode = map;
219 dev->keycodemax = map_size;
220 dev->getkeycode = sparse_keymap_getkeycode;
221 dev->setkeycode = sparse_keymap_setkeycode;
222
223 return 0;
224
225 err_out:
226 kfree(map);
227 return error;
228}
229EXPORT_SYMBOL(sparse_keymap_setup);
230
231
232
233
234
235
236
237
238
239
240
241
242void sparse_keymap_free(struct input_dev *dev)
243{
244 unsigned long flags;
245
246
247
248
249
250
251 spin_lock_irqsave(&dev->event_lock, flags);
252
253 kfree(dev->keycode);
254 dev->keycode = NULL;
255 dev->keycodemax = 0;
256
257 spin_unlock_irqrestore(&dev->event_lock, flags);
258}
259EXPORT_SYMBOL(sparse_keymap_free);
260
261
262
263
264
265
266
267
268
269
270
271
272
273void sparse_keymap_report_entry(struct input_dev *dev, const struct key_entry *ke,
274 unsigned int value, bool autorelease)
275{
276 switch (ke->type) {
277 case KE_KEY:
278 input_event(dev, EV_MSC, MSC_SCAN, ke->code);
279 input_report_key(dev, ke->keycode, value);
280 input_sync(dev);
281 if (value && autorelease) {
282 input_report_key(dev, ke->keycode, 0);
283 input_sync(dev);
284 }
285 break;
286
287 case KE_SW:
288 value = ke->sw.value;
289
290
291 case KE_VSW:
292 input_report_switch(dev, ke->sw.code, value);
293 break;
294 }
295}
296EXPORT_SYMBOL(sparse_keymap_report_entry);
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311bool sparse_keymap_report_event(struct input_dev *dev, unsigned int code,
312 unsigned int value, bool autorelease)
313{
314 const struct key_entry *ke =
315 sparse_keymap_entry_from_scancode(dev, code);
316 struct key_entry unknown_ke;
317
318 if (ke) {
319 sparse_keymap_report_entry(dev, ke, value, autorelease);
320 return true;
321 }
322
323
324 unknown_ke.type = KE_KEY;
325 unknown_ke.code = code;
326 unknown_ke.keycode = KEY_UNKNOWN;
327 sparse_keymap_report_entry(dev, &unknown_ke, value, true);
328
329 return false;
330}
331EXPORT_SYMBOL(sparse_keymap_report_event);
332
333