small update to adapt app to new module interface
[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
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 if (flags & GPIOKPF_DRIVE_INACTIVE)
129 return count;
130
131 gpio_evmi->flags = flags;
132
133 return count;
134 }
135
136 static ssize_t show_debounce_flag(struct device *dev, struct device_attribute *attr, char *buf)
137 {
138 if (!gpio_evmi)
139 return -ENODEV;
140
141 return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DEBOUNCE) ? 1 : 0);
142 }
143
144 static ssize_t store_debounce_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
145 {
146 unsigned flag;
147
148 if (!gpio_evmi)
149 return -ENODEV;
150
151 sscanf(buf, "%u", &flag);
152
153 if (flag) {
154 gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
155 } else {
156 gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
157 }
158
159 return count;
160 }
161
162 static ssize_t show_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
163 {
164 if (!gpio_evmi)
165 return -ENODEV;
166
167 return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0);
168 }
169
170 static ssize_t store_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
171 {
172 unsigned flag;
173
174 if (!gpio_evmi)
175 return -ENODEV;
176
177 sscanf(buf, "%u", &flag);
178
179 if (flag) {
180 gpio_evmi->flags |= GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
181 } else {
182 gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
183 }
184
185 return count;
186 }
187
188 static ssize_t show_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
189 {
190 if (!gpio_evmi)
191 return -ENODEV;
192
193 return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS) ? 1 : 0);
194 }
195
196 static ssize_t store_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
197 {
198 unsigned flag;
199
200 if (!gpio_evmi)
201 return -ENODEV;
202
203 sscanf(buf, "%u", &flag);
204
205 if (flag) {
206 gpio_evmi->flags |= GPIOKPF_PRINT_UNMAPPED_KEYS;
207 } else {
208 gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS;
209 }
210
211 return count;
212 }
213
214 static ssize_t show_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
215 {
216 if (!gpio_evmi)
217 return -ENODEV;
218
219 return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_MAPPED_KEYS) ? 1 : 0);
220 }
221
222 static ssize_t store_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
223 {
224 unsigned flag;
225
226 if (!gpio_evmi)
227 return -ENODEV;
228
229 sscanf(buf, "%u", &flag);
230
231 if (flag) {
232 gpio_evmi->flags |= GPIOKPF_PRINT_MAPPED_KEYS;
233 } else {
234 gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS;
235 }
236
237 return count;
238 }
239
240 static ssize_t show_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
241 {
242 if (!gpio_evmi)
243 return -ENODEV;
244
245 return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_PHANTOM_KEYS) ? 1 : 0);
246 }
247
248 static ssize_t store_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
249 {
250 unsigned flag;
251
252 if (!gpio_evmi)
253 return -ENODEV;
254
255 sscanf(buf, "%u", &flag);
256
257 if (flag) {
258 gpio_evmi->flags |= GPIOKPF_PRINT_PHANTOM_KEYS;
259 } else {
260 gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS;
261 }
262
263 return count;
264 }
265
266 static DEVICE_ATTR(debounce_delay, (S_IRUGO | S_IWUGO), show_debounce_delay, store_debounce_delay);
267 static DEVICE_ATTR(settle_time, (S_IRUGO | S_IWUGO), show_settle_time, store_settle_time);
268 static DEVICE_ATTR(poll_time, (S_IRUGO | S_IWUGO), show_poll_time, store_poll_time);
269 static DEVICE_ATTR(flags, (S_IRUGO), show_flags, store_flags);
270 static DEVICE_ATTR(debounce_flag, (S_IRUGO | S_IWUGO), show_debounce_flag, store_debounce_flag);
271 static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag);
272 static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag);
273 static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag);
274 static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag);
275
276 static void debounce_release(struct device *dev)
277 {
278 }
279
280 static struct device debounce_device = {
281 .init_name = "debounce",
282 .release = debounce_release,
283 };
284
285 static int __init debounce_init(void)
286 {
287 struct device *event_dev = NULL;
288 struct gpio_event_platform_data *gpio_epd;
289 struct gpio_event_info *gpio_ei;
290 int err = 0;
291
292 printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
293
294 event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
295 if (event_dev == NULL)
296 return -ENODEV;
297
298 gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
299 printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
300 if (strcmp(gpio_epd->name, "sholes-keypad"))
301 return -ENODEV;
302
303 gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
304 gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);
305
306 err = device_register(&debounce_device);
307 if (err) {
308 return err;
309 }
310
311 err = device_create_file(&debounce_device, &dev_attr_debounce_delay);
312 err = device_create_file(&debounce_device, &dev_attr_settle_time);
313 err = device_create_file(&debounce_device, &dev_attr_poll_time);
314 err = device_create_file(&debounce_device, &dev_attr_flags);
315 err = device_create_file(&debounce_device, &dev_attr_debounce_flag);
316 err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
317 err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
318 err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
319 err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
320
321 printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
322 printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
323 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
324 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
325
326 old_debounce_delay = gpio_evmi->debounce_delay;
327 old_settle_time = gpio_evmi->settle_time;
328 old_poll_time = gpio_evmi->poll_time;
329 old_flags = gpio_evmi->flags;
330
331 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
332
333 return 0;
334 }
335
336 static void __exit debounce_exit(void)
337 {
338 if (gpio_evmi) {
339 if (gpio_evmi->debounce_delay.tv.nsec != old_debounce_delay.tv.nsec) {
340 printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
341 gpio_evmi->debounce_delay = old_debounce_delay;
342 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
343 }
344 if (gpio_evmi->flags != old_flags) {
345 printk(KERN_INFO PREFIX "Restoring flags\n");
346 gpio_evmi->flags = old_flags;
347 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
348 }
349 gpio_evmi->settle_time = old_settle_time;
350 gpio_evmi->poll_time = old_poll_time;
351 }
352 device_remove_file(&debounce_device, &dev_attr_debounce_delay);
353 device_remove_file(&debounce_device, &dev_attr_settle_time);
354 device_remove_file(&debounce_device, &dev_attr_poll_time);
355 device_remove_file(&debounce_device, &dev_attr_flags);
356 device_remove_file(&debounce_device, &dev_attr_debounce_flag);
357 device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
358 device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
359 device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
360 device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
361 device_unregister(&debounce_device);
362 }
363
364 module_init(debounce_init);
365 module_exit(debounce_exit);
366
367 MODULE_LICENSE("GPL");
368 MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
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