better interaction with superuser
[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 int debounce_delay = 10;
9
10 module_param(debounce_delay, int, S_IRUSR | S_IRGRP | S_IROTH);
11 MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 10");
12
13 static int find_ms2_dev(struct device *dev, void *data)
14 {
15 if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) {
16 printk(KERN_INFO PREFIX "Found it\n");
17 return 1;
18 }
19 return 0;
20 }
21
22 static int __init debounce_init(void)
23 {
24 struct device *event_dev = NULL;
25 struct gpio_event_platform_data *gpio_epd;
26 struct gpio_event_info *gpio_ei;
27 struct gpio_event_matrix_info *gpio_evmi;
28
29 printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
30
31
32 event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
33 if (event_dev == NULL)
34 return -ENODEV;
35
36 gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
37 printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
38 if (strcmp(gpio_epd->name, "sholes-keypad"))
39 return -ENODEV;
40
41 gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
42 gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);
43
44 printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
45 printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
46 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
47 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
48
49 /* GPIOKPF_DEBOUNCE should already be set by GPIOKPF_REMOVE_PHANTOM_KEYS */
50 if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
51 printk(KERN_INFO PREFIX "Activating debounce\n");
52 gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
53 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
54 }
55
56 if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) {
57 printk(KERN_INFO PREFIX "Changing debounce_delay\n");
58 gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC;
59 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
60 }
61
62 return 0;
63 }
64
65 static void __exit debounce_exit(void)
66 {
67 }
68
69 module_init(debounce_init);
70 module_exit(debounce_exit);
71
72 MODULE_LICENSE("GPL");
73 MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
Impressum, Datenschutz