set keypad debounce time to 5 ms
[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 int find_ms2_dev(struct device *dev, void *data)
7 {
8 if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) {
9 printk(KERN_INFO "Found it!\n");
10 return 1;
11 }
12 return 0;
13 }
14
15 static int __init debounce_init(void)
16 {
17 struct device *event_dev = NULL;
18 struct gpio_event_platform_data *gpio_epd;
19 struct gpio_event_info *gpio_ei;
20 struct gpio_event_matrix_info *gpio_evmi;
21
22 printk(KERN_INFO "Searching for " GPIO_EVENT_DEV_NAME "...\n");
23
24
25 event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
26 if (event_dev == NULL)
27 return -ENODEV;
28
29 gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
30 printk(KERN_INFO "And there is a %s connected...\n", gpio_epd->name);
31 if (strcmp(gpio_epd->name, "sholes-keypad"))
32 return -ENODEV;
33
34 gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
35 gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);
36
37 printk(KERN_INFO "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
38 printk(KERN_INFO "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
39 printk(KERN_INFO "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
40 if (!gpio_evmi->debounce_delay.tv.nsec) {
41 printk(KERN_INFO "Activating debounce!\n");
42 gpio_evmi->debounce_delay.tv.nsec = 5 * NSEC_PER_MSEC;
43 printk(KERN_INFO "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
44 }
45
46 return 0;
47 }
48
49 static void __exit debounce_exit(void)
50 {
51 }
52
53 module_init(debounce_init);
54 module_exit(debounce_exit);
55
56 MODULE_LICENSE("GPL");
57 MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
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