[ms2-fixes] / debounce.c

#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio_event.h>

#define PREFIX "debounce: "

static int debounce_delay = 15;

static int old_delay = 0;
static unsigned old_flags = 0;
static struct gpio_event_matrix_info *gpio_evmi = NULL;

module_param(debounce_delay, int, S_IRUSR | S_IRGRP | S_IROTH);
MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 15");

static int find_ms2_dev(struct device *dev, void *data)
{
	if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) {
		printk(KERN_INFO PREFIX "Found it\n");
		return 1;
	}
	return 0;
}

static int __init debounce_init(void)
{
	struct device *event_dev = NULL;
	struct gpio_event_platform_data *gpio_epd;
	struct gpio_event_info *gpio_ei;

	printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");

	
	event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
	if (event_dev == NULL)
		return -ENODEV;

	gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
	printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
	if (strcmp(gpio_epd->name, "sholes-keypad"))
		return -ENODEV;

	gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
	gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);

	printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
	printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);

	old_delay = gpio_evmi->debounce_delay.tv.nsec;

	if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) {
		printk(KERN_INFO PREFIX "Changing debounce_delay\n");
		gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC;
		printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
	}

	old_flags = gpio_evmi->flags;

	if (gpio_evmi->debounce_delay.tv.nsec != 0) {
		/* GPIOKPF_DEBOUNCE should already be set by GPIOKPF_REMOVE_PHANTOM_KEYS */
		if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
			printk(KERN_INFO PREFIX "Activating debounce\n");
			gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
		}
	} else {
		/* Deactivating GPIOKPF_DEBOUNCE */
		printk(KERN_INFO PREFIX "Deactivating debounce\n");
		gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
	}
	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);

	return 0;
}

static void __exit debounce_exit(void)
{
	if (gpio_evmi) {
		if (gpio_evmi->debounce_delay.tv.nsec != old_delay) {
			printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
			gpio_evmi->debounce_delay.tv.nsec = old_delay;
			printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
		}
		if (gpio_evmi->flags != old_flags) {
			printk(KERN_INFO PREFIX "Restoring flags\n");
			gpio_evmi->flags = old_flags;
			printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
		}
	}
}

module_init(debounce_init);
module_exit(debounce_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");
Commit	Line	Data
b422e333	1	#include <linux/module.h>
d1ff9643 MG	2	#include <linux/device.h>
	3	#include <linux/platform_device.h>
	4	#include <linux/gpio_event.h>
	5
ab5ed215 MG	6	#define PREFIX "debounce: "
ab5ed215 MG	7
a4838b14	8	static int debounce_delay = 15;
ab5ed215	9
1e65c113	10	static int old_delay = 0;
a4838b14	11	static unsigned old_flags = 0;
1e65c113 MG	12	static struct gpio_event_matrix_info *gpio_evmi = NULL;
1e65c113 MG	13
b2b792eb	14	module_param(debounce_delay, int, S_IRUSR \| S_IRGRP \| S_IROTH);
a4838b14	15	MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 15");
ab5ed215 MG	16
ab5ed215 MG	17	static int find_ms2_dev(struct device dev, void data)
d1ff9643 MG	18	{
d1ff9643 MG	19	if (!strncmp((char)data, dev_name(dev), strlen((char)data))) {
ab5ed215	20	printk(KERN_INFO PREFIX "Found it\n");
d1ff9643 MG	21	return 1;
	22	}
	23	return 0;
	24	}
b422e333 MG	25
	26	static int __init debounce_init(void)
	27	{
d1ff9643 MG	28	struct device *event_dev = NULL;
	29	struct gpio_event_platform_data *gpio_epd;
	30	struct gpio_event_info *gpio_ei;
d1ff9643	31
ab5ed215	32	printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
d1ff9643 MG	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;
ab5ed215	40	printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
d1ff9643 MG	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
ab5ed215 MG	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);
20bf1c9e	51
1e65c113 MG	52	old_delay = gpio_evmi->debounce_delay.tv.nsec;
1e65c113 MG	53
b2b792eb	54	if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) {
ab5ed215	55	printk(KERN_INFO PREFIX "Changing debounce_delay\n");
b2b792eb	56	gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC;
ab5ed215	57	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
d1ff9643 MG	58	}
d1ff9643 MG	59
a4838b14 MG	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
b422e333 MG	75	return 0;
	76	}
	77
	78	static void __exit debounce_exit(void)
	79	{
1e65c113 MG	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	}
a4838b14 MG	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	}
1e65c113	91	}
b422e333 MG	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>");