consistent state
[ms2-fixes] / debounce.c
1 #include <linux/module.h>
2 #include <linux/device.h>
3 #include <linux/platform_device.h>
4 #include <linux/gpio_event.h>
5 #include <mach/gpio.h>
6
7 #define PREFIX "debounce: "
8
9 static unsigned old_flags = 0;
10 static ktime_t old_debounce_delay;
11 static ktime_t old_settle_time;
12 static ktime_t old_poll_time;
13 static struct gpio_event_matrix_info *gpio_evmi = NULL;
14 static int hw_debounce = 0;
15 static int hw_debounce_time = 0;
16
17 static int find_ms2_dev(struct device *dev, void *data)
18 {
19 if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) {
20 printk(KERN_INFO PREFIX "Found it\n");
21 return 1;
22 }
23 return 0;
24 }
25
26 /* hardware debounce: (time + 1) * 31us */
27 static void hw_debounce_set(int enable, int time) {
28 int i;
29
30 if (gpio_evmi == NULL)
31 return;
32
33 for (i = 0; i < gpio_evmi->ninputs; i++) {
34 int gpio = gpio_evmi->input_gpios[i];
35
36 if ((time != -1) && (time != hw_debounce_time) && hw_debounce) {
37 printk(KERN_INFO PREFIX "Setting hardware debounce time for GPIO %d to %d (%dus)\n", gpio, time, (time+1)*31);
38 omap_set_gpio_debounce_time(gpio, time);
39 }
40
41 if ((enable != -1) && (enable != hw_debounce)) {
42 printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio);
43 omap_set_gpio_debounce(gpio, enable);
44 }
45 }
46 }
47
48
49 static ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf)
50 {
51 if (!gpio_evmi)
52 return -ENODEV;
53
54 return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->debounce_delay.tv.nsec / NSEC_PER_MSEC));
55 }
56
57 static void set_debounce_delay(long delay)
58 {
59 if (gpio_evmi->debounce_delay.tv.nsec != delay * NSEC_PER_MSEC) {
60 printk(KERN_INFO PREFIX "Changing debounce_delay\n");
61 gpio_evmi->debounce_delay.tv.nsec = delay * NSEC_PER_MSEC;
62 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
63 }
64
65 #if 0
66 if (gpio_evmi->debounce_delay.tv.nsec != 0) {
67 if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
68 printk(KERN_INFO PREFIX "Activating debounce\n");
69 gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
70 }
71 } else {
72 if (gpio_evmi->flags & GPIOKPF_DEBOUNCE) {
73 printk(KERN_INFO PREFIX "Deactivating debounce\n");
74 gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
75 }
76 }
77 #endif
78 }
79
80 static ssize_t store_debounce_delay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
81 {
82 long int delay;
83
84 if (!gpio_evmi)
85 return -ENODEV;
86
87 sscanf(buf, "%ld", &delay);
88 set_debounce_delay(delay);
89
90 return count;
91 }
92
93 static ssize_t show_settle_time(struct device *dev, struct device_attribute *attr, char *buf)
94 {
95 if (!gpio_evmi)
96 return -ENODEV;
97
98 return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->settle_time.tv.nsec / NSEC_PER_USEC));
99 }
100
101 static ssize_t store_settle_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
102 {
103 long int delay;
104
105 if (!gpio_evmi)
106 return -ENODEV;
107
108 sscanf(buf, "%ld", &delay);
109 gpio_evmi->settle_time.tv.nsec = delay * NSEC_PER_USEC;
110
111 return count;
112 }
113
114 static ssize_t show_poll_time(struct device *dev, struct device_attribute *attr, char *buf)
115 {
116 if (!gpio_evmi)
117 return -ENODEV;
118
119 return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->poll_time.tv.nsec / NSEC_PER_MSEC));
120 }
121
122 static ssize_t store_poll_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
123 {
124 long int delay;
125
126 if (!gpio_evmi)
127 return -ENODEV;
128
129 sscanf(buf, "%ld", &delay);
130 gpio_evmi->poll_time.tv.nsec = delay * NSEC_PER_MSEC;
131
132 return count;
133 }
134
135 static ssize_t show_flags(struct device *dev, struct device_attribute *attr, char *buf)
136 {
137 if (!gpio_evmi)
138 return -ENODEV;
139
140 return snprintf(buf, PAGE_SIZE, "0x%x\n", gpio_evmi->flags);
141 }
142
143 static ssize_t store_flags(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
144 {
145 unsigned flags;
146
147 if (!gpio_evmi)
148 return -ENODEV;
149
150 sscanf(buf, "0x%x", &flags);
151
152 printk(KERN_INFO PREFIX "flags: 0x%x\n", flags);
153
154 gpio_evmi->flags = flags;
155
156 return count;
157 }
158
159 static ssize_t show_debounce_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_DEBOUNCE) ? 1 : 0);
165 }
166
167 static ssize_t store_debounce_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_DEBOUNCE;
178 } else {
179 gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
180 }
181
182 return count;
183 }
184
185 static ssize_t show_remove_some_phantom_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_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0);
191 }
192
193 static ssize_t store_remove_some_phantom_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_REMOVE_SOME_PHANTOM_KEYS;
204 } else {
205 gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
206 }
207
208 return count;
209 }
210
211 static ssize_t show_print_unmapped_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_UNMAPPED_KEYS) ? 1 : 0);
217 }
218
219 static ssize_t store_print_unmapped_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_UNMAPPED_KEYS;
230 } else {
231 gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS;
232 }
233
234 return count;
235 }
236
237 static ssize_t show_print_mapped_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_MAPPED_KEYS) ? 1 : 0);
243 }
244
245 static ssize_t store_print_mapped_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_MAPPED_KEYS;
256 } else {
257 gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS;
258 }
259
260 return count;
261 }
262
263 static ssize_t show_print_phantom_keys_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_PRINT_PHANTOM_KEYS) ? 1 : 0);
269 }
270
271 static ssize_t store_print_phantom_keys_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_PRINT_PHANTOM_KEYS;
282 } else {
283 gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS;
284 }
285
286 return count;
287 }
288
289 static ssize_t show_active_high_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_ACTIVE_HIGH) ? 1 : 0);
295 }
296
297 static ssize_t store_active_high_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_ACTIVE_HIGH;
308 } else {
309 gpio_evmi->flags &= ~GPIOKPF_ACTIVE_HIGH;
310 }
311
312 return count;
313 }
314
315 static ssize_t show_drive_inactive_flag(struct device *dev, struct device_attribute *attr, char *buf)
316 {
317 if (!gpio_evmi)
318 return -ENODEV;
319
320 return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DRIVE_INACTIVE) ? 1 : 0);
321 }
322
323 static ssize_t store_drive_inactive_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
324 {
325 unsigned flag;
326
327 if (!gpio_evmi)
328 return -ENODEV;
329
330 sscanf(buf, "%u", &flag);
331
332 if (flag) {
333 gpio_evmi->flags |= GPIOKPF_DRIVE_INACTIVE;
334 } else {
335 gpio_evmi->flags &= ~GPIOKPF_DRIVE_INACTIVE;
336 }
337
338 return count;
339 }
340
341 static ssize_t show_hw_debounce(struct device *dev, struct device_attribute *attr, char *buf)
342 {
343 return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce);
344 }
345
346 static ssize_t store_hw_debounce(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
347 {
348 int enable;
349
350 sscanf(buf, "%d", &enable);
351
352 if (enable) {
353 hw_debounce_set(1, -1);
354 hw_debounce = 1;
355 hw_debounce_set(-1, 0);
356 hw_debounce_time = 0;
357 }
358 else {
359 hw_debounce_set(-1, 0);
360 hw_debounce_set(0, -1);
361 hw_debounce = 0;
362 hw_debounce_time = 0;
363 }
364
365 return count;
366 }
367
368 static ssize_t show_hw_debounce_time(struct device *dev, struct device_attribute *attr, char *buf)
369 {
370 return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce_time);
371 }
372
373 static ssize_t store_hw_debounce_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
374 {
375 int time;
376
377 sscanf(buf, "%d", &time);
378
379 if ((time < 0) || (time > 0xff))
380 return count;
381
382 hw_debounce_set(-1, time);
383 hw_debounce_time = time;
384
385 return count;
386 }
387
388 static DEVICE_ATTR(debounce_delay, (S_IRUGO | S_IWUGO), show_debounce_delay, store_debounce_delay);
389 static DEVICE_ATTR(settle_time, (S_IRUGO | S_IWUGO), show_settle_time, store_settle_time);
390 static DEVICE_ATTR(poll_time, (S_IRUGO | S_IWUGO), show_poll_time, store_poll_time);
391 static DEVICE_ATTR(flags, (S_IRUGO), show_flags, store_flags);
392 static DEVICE_ATTR(debounce_flag, (S_IRUGO | S_IWUGO), show_debounce_flag, store_debounce_flag);
393 static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag);
394 static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag);
395 static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag);
396 static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag);
397 static DEVICE_ATTR(active_high_flag, (S_IRUGO), show_active_high_flag, store_active_high_flag);
398 static DEVICE_ATTR(drive_inactive_flag, (S_IRUGO | S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag);
399 static DEVICE_ATTR(hw_debounce, (S_IRUGO | S_IWUGO), show_hw_debounce, store_hw_debounce);
400 static DEVICE_ATTR(hw_debounce_time, (S_IRUGO | S_IWUGO), show_hw_debounce_time, store_hw_debounce_time);
401
402 static void debounce_release(struct device *dev)
403 {
404 }
405
406 static struct device debounce_device = {
407 .init_name = "debounce",
408 .release = debounce_release,
409 };
410
411 static int __init debounce_init(void)
412 {
413 struct device *event_dev = NULL;
414 struct gpio_event_platform_data *gpio_epd;
415 struct gpio_event_info *gpio_ei;
416 int err = 0;
417
418 printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
419
420 event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
421 if (event_dev == NULL)
422 return -ENODEV;
423
424 gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
425 printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
426 if (strcmp(gpio_epd->name, "sholes-keypad"))
427 return -ENODEV;
428
429 gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
430 gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);
431
432 err = device_register(&debounce_device);
433 if (err) {
434 return err;
435 }
436
437 err = device_create_file(&debounce_device, &dev_attr_debounce_delay);
438 err = device_create_file(&debounce_device, &dev_attr_settle_time);
439 err = device_create_file(&debounce_device, &dev_attr_poll_time);
440 err = device_create_file(&debounce_device, &dev_attr_flags);
441 err = device_create_file(&debounce_device, &dev_attr_debounce_flag);
442 err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
443 err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
444 err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
445 err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
446 err = device_create_file(&debounce_device, &dev_attr_active_high_flag);
447 err = device_create_file(&debounce_device, &dev_attr_drive_inactive_flag);
448 err = device_create_file(&debounce_device, &dev_attr_hw_debounce);
449 err = device_create_file(&debounce_device, &dev_attr_hw_debounce_time);
450
451 printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
452 printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
453 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
454 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
455
456 old_debounce_delay = gpio_evmi->debounce_delay;
457 old_settle_time = gpio_evmi->settle_time;
458 old_poll_time = gpio_evmi->poll_time;
459 old_flags = gpio_evmi->flags;
460
461 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
462
463 return 0;
464 }
465
466 static void __exit debounce_exit(void)
467 {
468 if (gpio_evmi) {
469 if (gpio_evmi->debounce_delay.tv.nsec != old_debounce_delay.tv.nsec) {
470 printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
471 gpio_evmi->debounce_delay = old_debounce_delay;
472 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
473 }
474 if (gpio_evmi->flags != old_flags) {
475 printk(KERN_INFO PREFIX "Restoring flags\n");
476 gpio_evmi->flags = old_flags;
477 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
478 }
479 gpio_evmi->settle_time = old_settle_time;
480 gpio_evmi->poll_time = old_poll_time;
481 }
482 hw_debounce_set(0, 0);
483 device_remove_file(&debounce_device, &dev_attr_debounce_delay);
484 device_remove_file(&debounce_device, &dev_attr_settle_time);
485 device_remove_file(&debounce_device, &dev_attr_poll_time);
486 device_remove_file(&debounce_device, &dev_attr_flags);
487 device_remove_file(&debounce_device, &dev_attr_debounce_flag);
488 device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
489 device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
490 device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
491 device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
492 device_remove_file(&debounce_device, &dev_attr_active_high_flag);
493 device_remove_file(&debounce_device, &dev_attr_drive_inactive_flag);
494 device_remove_file(&debounce_device, &dev_attr_hw_debounce);
495 device_remove_file(&debounce_device, &dev_attr_hw_debounce_time);
496 device_unregister(&debounce_device);
497 }
498
499 module_init(debounce_init);
500 module_exit(debounce_exit);
501
502 MODULE_LICENSE("GPL");
503 MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
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