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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 = 15; | |
9 | ||
10 | static int old_delay = 0; | |
11 | static unsigned old_flags = 0; | |
12 | static struct gpio_event_matrix_info *gpio_evmi = NULL; | |
13 | ||
14 | module_param(debounce_delay, int, S_IRUSR | S_IRGRP | S_IROTH); | |
15 | MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 15"); | |
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 | static int __init debounce_init(void) | |
27 | { | |
28 | struct device *event_dev = NULL; | |
29 | struct gpio_event_platform_data *gpio_epd; | |
30 | struct gpio_event_info *gpio_ei; | |
31 | ||
32 | printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n"); | |
33 | ||
34 | ||
35 | event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev); | |
36 | if (event_dev == NULL) | |
37 | return -ENODEV; | |
38 | ||
39 | gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data; | |
40 | printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name); | |
41 | if (strcmp(gpio_epd->name, "sholes-keypad")) | |
42 | return -ENODEV; | |
43 | ||
44 | gpio_ei = (struct gpio_event_info*)gpio_epd->info[0]; | |
45 | gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info); | |
46 | ||
47 | printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec); | |
48 | printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec); | |
49 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); | |
50 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); | |
51 | ||
52 | old_delay = gpio_evmi->debounce_delay.tv.nsec; | |
53 | ||
54 | if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) { | |
55 | printk(KERN_INFO PREFIX "Changing debounce_delay\n"); | |
56 | gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC; | |
57 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); | |
58 | } | |
59 | ||
60 | old_flags = gpio_evmi->flags; | |
61 | ||
62 | if (gpio_evmi->debounce_delay.tv.nsec != 0) { | |
63 | /* GPIOKPF_DEBOUNCE should already be set by GPIOKPF_REMOVE_PHANTOM_KEYS */ | |
64 | if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) { | |
65 | printk(KERN_INFO PREFIX "Activating debounce\n"); | |
66 | gpio_evmi->flags |= GPIOKPF_DEBOUNCE; | |
67 | } | |
68 | } else { | |
69 | /* Deactivating GPIOKPF_DEBOUNCE */ | |
70 | printk(KERN_INFO PREFIX "Deactivating debounce\n"); | |
71 | gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE; | |
72 | } | |
73 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static void __exit debounce_exit(void) | |
79 | { | |
80 | if (gpio_evmi) { | |
81 | if (gpio_evmi->debounce_delay.tv.nsec != old_delay) { | |
82 | printk(KERN_INFO PREFIX "Restoring debounce_delay\n"); | |
83 | gpio_evmi->debounce_delay.tv.nsec = old_delay; | |
84 | printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); | |
85 | } | |
86 | if (gpio_evmi->flags != old_flags) { | |
87 | printk(KERN_INFO PREFIX "Restoring flags\n"); | |
88 | gpio_evmi->flags = old_flags; | |
89 | printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); | |
90 | } | |
91 | } | |
92 | } | |
93 | ||
94 | module_init(debounce_init); | |
95 | module_exit(debounce_exit); | |
96 | ||
97 | MODULE_LICENSE("GPL"); | |
98 | MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>"); |