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1 | #include <linux/module.h> | |
2 | #include <linux/device.h> | |
3 | #include <linux/platform_device.h> | |
4 | #include <linux/gpio_event.h> | |
5 | ||
6 | #define PREFIX "debounce: " | |
7 | ||
8 | static unsigned old_flags = 0; | |
9 | ktime_t old_debounce_delay; | |
10 | ktime_t old_settle_time; | |
11 | ktime_t old_poll_time; | |
12 | static struct gpio_event_matrix_info *gpio_evmi = NULL; | |
13 | ||
14 | static int find_ms2_dev(struct device *dev, void *data) | |
15 | { | |
16 | if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) { | |
17 | printk(KERN_INFO PREFIX "Found it\n"); | |
18 | return 1; | |
19 | } | |
20 | return 0; | |
21 | } | |
22 | ||
23 | static ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf) | |
24 | { | |
25 | if (!gpio_evmi) | |
26 | return -ENODEV; | |
27 | ||
28 | return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->debounce_delay.tv.nsec / NSEC_PER_MSEC)); | |
29 | } | |
30 | ||
31 | static void set_debounce_delay(long delay) | |
32 | { | |
33 | if (gpio_evmi->debounce_delay.tv.nsec != delay * NSEC_PER_MSEC) { | |
34 | printk(KERN_INFO PREFIX "Changing debounce_delay\n"); | |
35 | gpio_evmi->debounce_delay.tv.nsec = delay * NSEC_PER_MSEC; | |
36 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); | |
37 | } | |
38 | ||
39 | #if 0 | |
40 | if (gpio_evmi->debounce_delay.tv.nsec != 0) { | |
41 | if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) { | |
42 | printk(KERN_INFO PREFIX "Activating debounce\n"); | |
43 | gpio_evmi->flags |= GPIOKPF_DEBOUNCE; | |
44 | } | |
45 | } else { | |
46 | if (gpio_evmi->flags & GPIOKPF_DEBOUNCE) { | |
47 | printk(KERN_INFO PREFIX "Deactivating debounce\n"); | |
48 | gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE; | |
49 | } | |
50 | } | |
51 | #endif | |
52 | } | |
53 | ||
54 | static ssize_t store_debounce_delay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
55 | { | |
56 | long int delay; | |
57 | ||
58 | if (!gpio_evmi) | |
59 | return -ENODEV; | |
60 | ||
61 | sscanf(buf, "%ld", &delay); | |
62 | set_debounce_delay(delay); | |
63 | ||
64 | return count; | |
65 | } | |
66 | ||
67 | static ssize_t show_settle_time(struct device *dev, struct device_attribute *attr, char *buf) | |
68 | { | |
69 | if (!gpio_evmi) | |
70 | return -ENODEV; | |
71 | ||
72 | return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->settle_time.tv.nsec / NSEC_PER_USEC)); | |
73 | } | |
74 | ||
75 | static ssize_t store_settle_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
76 | { | |
77 | long int delay; | |
78 | ||
79 | if (!gpio_evmi) | |
80 | return -ENODEV; | |
81 | ||
82 | sscanf(buf, "%ld", &delay); | |
83 | gpio_evmi->settle_time.tv.nsec = delay * NSEC_PER_USEC; | |
84 | ||
85 | return count; | |
86 | } | |
87 | ||
88 | static ssize_t show_poll_time(struct device *dev, struct device_attribute *attr, char *buf) | |
89 | { | |
90 | if (!gpio_evmi) | |
91 | return -ENODEV; | |
92 | ||
93 | return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->poll_time.tv.nsec / NSEC_PER_MSEC)); | |
94 | } | |
95 | ||
96 | static ssize_t store_poll_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
97 | { | |
98 | long int delay; | |
99 | ||
100 | if (!gpio_evmi) | |
101 | return -ENODEV; | |
102 | ||
103 | sscanf(buf, "%ld", &delay); | |
104 | gpio_evmi->poll_time.tv.nsec = delay * NSEC_PER_MSEC; | |
105 | ||
106 | return count; | |
107 | } | |
108 | ||
109 | static ssize_t show_flags(struct device *dev, struct device_attribute *attr, char *buf) | |
110 | { | |
111 | if (!gpio_evmi) | |
112 | return -ENODEV; | |
113 | ||
114 | return snprintf(buf, PAGE_SIZE, "0x%x\n", gpio_evmi->flags); | |
115 | } | |
116 | ||
117 | static ssize_t store_flags(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
118 | { | |
119 | unsigned flags; | |
120 | ||
121 | if (!gpio_evmi) | |
122 | return -ENODEV; | |
123 | ||
124 | sscanf(buf, "0x%x", &flags); | |
125 | ||
126 | printk(KERN_INFO PREFIX "flags: 0x%x\n", flags); | |
127 | ||
128 | gpio_evmi->flags = flags; | |
129 | ||
130 | return count; | |
131 | } | |
132 | ||
133 | static ssize_t show_debounce_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
134 | { | |
135 | if (!gpio_evmi) | |
136 | return -ENODEV; | |
137 | ||
138 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DEBOUNCE) ? 1 : 0); | |
139 | } | |
140 | ||
141 | static ssize_t store_debounce_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
142 | { | |
143 | unsigned flag; | |
144 | ||
145 | if (!gpio_evmi) | |
146 | return -ENODEV; | |
147 | ||
148 | sscanf(buf, "%u", &flag); | |
149 | ||
150 | if (flag) { | |
151 | gpio_evmi->flags |= GPIOKPF_DEBOUNCE; | |
152 | } else { | |
153 | gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE; | |
154 | } | |
155 | ||
156 | return count; | |
157 | } | |
158 | ||
159 | static ssize_t show_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
160 | { | |
161 | if (!gpio_evmi) | |
162 | return -ENODEV; | |
163 | ||
164 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0); | |
165 | } | |
166 | ||
167 | static ssize_t store_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
168 | { | |
169 | unsigned flag; | |
170 | ||
171 | if (!gpio_evmi) | |
172 | return -ENODEV; | |
173 | ||
174 | sscanf(buf, "%u", &flag); | |
175 | ||
176 | if (flag) { | |
177 | gpio_evmi->flags |= GPIOKPF_REMOVE_SOME_PHANTOM_KEYS; | |
178 | } else { | |
179 | gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS; | |
180 | } | |
181 | ||
182 | return count; | |
183 | } | |
184 | ||
185 | static ssize_t show_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
186 | { | |
187 | if (!gpio_evmi) | |
188 | return -ENODEV; | |
189 | ||
190 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS) ? 1 : 0); | |
191 | } | |
192 | ||
193 | static ssize_t store_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
194 | { | |
195 | unsigned flag; | |
196 | ||
197 | if (!gpio_evmi) | |
198 | return -ENODEV; | |
199 | ||
200 | sscanf(buf, "%u", &flag); | |
201 | ||
202 | if (flag) { | |
203 | gpio_evmi->flags |= GPIOKPF_PRINT_UNMAPPED_KEYS; | |
204 | } else { | |
205 | gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS; | |
206 | } | |
207 | ||
208 | return count; | |
209 | } | |
210 | ||
211 | static ssize_t show_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
212 | { | |
213 | if (!gpio_evmi) | |
214 | return -ENODEV; | |
215 | ||
216 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_MAPPED_KEYS) ? 1 : 0); | |
217 | } | |
218 | ||
219 | static ssize_t store_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
220 | { | |
221 | unsigned flag; | |
222 | ||
223 | if (!gpio_evmi) | |
224 | return -ENODEV; | |
225 | ||
226 | sscanf(buf, "%u", &flag); | |
227 | ||
228 | if (flag) { | |
229 | gpio_evmi->flags |= GPIOKPF_PRINT_MAPPED_KEYS; | |
230 | } else { | |
231 | gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS; | |
232 | } | |
233 | ||
234 | return count; | |
235 | } | |
236 | ||
237 | static ssize_t show_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
238 | { | |
239 | if (!gpio_evmi) | |
240 | return -ENODEV; | |
241 | ||
242 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_PHANTOM_KEYS) ? 1 : 0); | |
243 | } | |
244 | ||
245 | static ssize_t store_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
246 | { | |
247 | unsigned flag; | |
248 | ||
249 | if (!gpio_evmi) | |
250 | return -ENODEV; | |
251 | ||
252 | sscanf(buf, "%u", &flag); | |
253 | ||
254 | if (flag) { | |
255 | gpio_evmi->flags |= GPIOKPF_PRINT_PHANTOM_KEYS; | |
256 | } else { | |
257 | gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS; | |
258 | } | |
259 | ||
260 | return count; | |
261 | } | |
262 | ||
263 | static ssize_t show_active_high_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
264 | { | |
265 | if (!gpio_evmi) | |
266 | return -ENODEV; | |
267 | ||
268 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_ACTIVE_HIGH) ? 1 : 0); | |
269 | } | |
270 | ||
271 | static ssize_t store_active_high_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
272 | { | |
273 | unsigned flag; | |
274 | ||
275 | if (!gpio_evmi) | |
276 | return -ENODEV; | |
277 | ||
278 | sscanf(buf, "%u", &flag); | |
279 | ||
280 | if (flag) { | |
281 | gpio_evmi->flags |= GPIOKPF_ACTIVE_HIGH; | |
282 | } else { | |
283 | gpio_evmi->flags &= ~GPIOKPF_ACTIVE_HIGH; | |
284 | } | |
285 | ||
286 | return count; | |
287 | } | |
288 | ||
289 | static ssize_t show_drive_inactive_flag(struct device *dev, struct device_attribute *attr, char *buf) | |
290 | { | |
291 | if (!gpio_evmi) | |
292 | return -ENODEV; | |
293 | ||
294 | return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DRIVE_INACTIVE) ? 1 : 0); | |
295 | } | |
296 | ||
297 | static ssize_t store_drive_inactive_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
298 | { | |
299 | unsigned flag; | |
300 | ||
301 | if (!gpio_evmi) | |
302 | return -ENODEV; | |
303 | ||
304 | sscanf(buf, "%u", &flag); | |
305 | ||
306 | if (flag) { | |
307 | gpio_evmi->flags |= GPIOKPF_DRIVE_INACTIVE; | |
308 | } else { | |
309 | gpio_evmi->flags &= ~GPIOKPF_DRIVE_INACTIVE; | |
310 | } | |
311 | ||
312 | return count; | |
313 | } | |
314 | ||
315 | static DEVICE_ATTR(debounce_delay, (S_IRUGO | S_IWUGO), show_debounce_delay, store_debounce_delay); | |
316 | static DEVICE_ATTR(settle_time, (S_IRUGO | S_IWUGO), show_settle_time, store_settle_time); | |
317 | static DEVICE_ATTR(poll_time, (S_IRUGO | S_IWUGO), show_poll_time, store_poll_time); | |
318 | static DEVICE_ATTR(flags, (S_IRUGO), show_flags, store_flags); | |
319 | static DEVICE_ATTR(debounce_flag, (S_IRUGO | S_IWUGO), show_debounce_flag, store_debounce_flag); | |
320 | static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag); | |
321 | static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag); | |
322 | static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag); | |
323 | static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag); | |
324 | static DEVICE_ATTR(active_high_flag, (S_IRUGO), show_active_high_flag, store_active_high_flag); | |
325 | static DEVICE_ATTR(drive_inactive_flag, (S_IRUGO | S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag); | |
326 | ||
327 | static void debounce_release(struct device *dev) | |
328 | { | |
329 | } | |
330 | ||
331 | static struct device debounce_device = { | |
332 | .init_name = "debounce", | |
333 | .release = debounce_release, | |
334 | }; | |
335 | ||
336 | static int __init debounce_init(void) | |
337 | { | |
338 | struct device *event_dev = NULL; | |
339 | struct gpio_event_platform_data *gpio_epd; | |
340 | struct gpio_event_info *gpio_ei; | |
341 | int err = 0; | |
342 | ||
343 | printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n"); | |
344 | ||
345 | event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev); | |
346 | if (event_dev == NULL) | |
347 | return -ENODEV; | |
348 | ||
349 | gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data; | |
350 | printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name); | |
351 | if (strcmp(gpio_epd->name, "sholes-keypad")) | |
352 | return -ENODEV; | |
353 | ||
354 | gpio_ei = (struct gpio_event_info*)gpio_epd->info[0]; | |
355 | gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info); | |
356 | ||
357 | err = device_register(&debounce_device); | |
358 | if (err) { | |
359 | return err; | |
360 | } | |
361 | ||
362 | err = device_create_file(&debounce_device, &dev_attr_debounce_delay); | |
363 | err = device_create_file(&debounce_device, &dev_attr_settle_time); | |
364 | err = device_create_file(&debounce_device, &dev_attr_poll_time); | |
365 | err = device_create_file(&debounce_device, &dev_attr_flags); | |
366 | err = device_create_file(&debounce_device, &dev_attr_debounce_flag); | |
367 | err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag); | |
368 | err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag); | |
369 | err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag); | |
370 | err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag); | |
371 | err = device_create_file(&debounce_device, &dev_attr_active_high_flag); | |
372 | err = device_create_file(&debounce_device, &dev_attr_drive_inactive_flag); | |
373 | ||
374 | printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec); | |
375 | printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec); | |
376 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); | |
377 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); | |
378 | ||
379 | old_debounce_delay = gpio_evmi->debounce_delay; | |
380 | old_settle_time = gpio_evmi->settle_time; | |
381 | old_poll_time = gpio_evmi->poll_time; | |
382 | old_flags = gpio_evmi->flags; | |
383 | ||
384 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static void __exit debounce_exit(void) | |
390 | { | |
391 | if (gpio_evmi) { | |
392 | if (gpio_evmi->debounce_delay.tv.nsec != old_debounce_delay.tv.nsec) { | |
393 | printk(KERN_INFO PREFIX "Restoring debounce_delay\n"); | |
394 | gpio_evmi->debounce_delay = old_debounce_delay; | |
395 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); | |
396 | } | |
397 | if (gpio_evmi->flags != old_flags) { | |
398 | printk(KERN_INFO PREFIX "Restoring flags\n"); | |
399 | gpio_evmi->flags = old_flags; | |
400 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); | |
401 | } | |
402 | gpio_evmi->settle_time = old_settle_time; | |
403 | gpio_evmi->poll_time = old_poll_time; | |
404 | } | |
405 | device_remove_file(&debounce_device, &dev_attr_debounce_delay); | |
406 | device_remove_file(&debounce_device, &dev_attr_settle_time); | |
407 | device_remove_file(&debounce_device, &dev_attr_poll_time); | |
408 | device_remove_file(&debounce_device, &dev_attr_flags); | |
409 | device_remove_file(&debounce_device, &dev_attr_debounce_flag); | |
410 | device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag); | |
411 | device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag); | |
412 | device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag); | |
413 | device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag); | |
414 | device_remove_file(&debounce_device, &dev_attr_active_high_flag); | |
415 | device_remove_file(&debounce_device, &dev_attr_drive_inactive_flag); | |
416 | device_unregister(&debounce_device); | |
417 | } | |
418 | ||
419 | module_init(debounce_init); | |
420 | module_exit(debounce_exit); | |
421 | ||
422 | MODULE_LICENSE("GPL"); | |
423 | MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>"); |