better interaction with superuser
[ms2-fixes] / debounce.c
CommitLineData
b422e333 1#include <linux/module.h>
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2#include <linux/device.h>
3#include <linux/platform_device.h>
4#include <linux/gpio_event.h>
5
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6#define PREFIX "debounce: "
7
b2b792eb 8static int debounce_delay = 10;
ab5ed215 9
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10module_param(debounce_delay, int, S_IRUSR | S_IRGRP | S_IROTH);
11MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 10");
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12
13static int find_ms2_dev(struct device *dev, void *data)
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14{
15 if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) {
ab5ed215 16 printk(KERN_INFO PREFIX "Found it\n");
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17 return 1;
18 }
19 return 0;
20}
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21
22static int __init debounce_init(void)
23{
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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
ab5ed215 29 printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
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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;
ab5ed215 37 printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
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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
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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);
20bf1c9e 48
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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");
20bf1c9e 52 gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
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53 printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
54 }
55
b2b792eb 56 if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) {
ab5ed215 57 printk(KERN_INFO PREFIX "Changing debounce_delay\n");
b2b792eb 58 gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC;
ab5ed215 59 printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
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60 }
61
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62 return 0;
63}
64
65static void __exit debounce_exit(void)
66{
67}
68
69module_init(debounce_init);
70module_exit(debounce_exit);
71
72MODULE_LICENSE("GPL");
73MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
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