[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 unsigned old_flags = 0;
ktime_t old_debounce_delay;
ktime_t old_settle_time;
ktime_t old_poll_time;
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 ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->debounce_delay.tv.nsec / NSEC_PER_MSEC));
}

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

#if 0
	if (gpio_evmi->debounce_delay.tv.nsec != 0) {
		if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
			printk(KERN_INFO PREFIX "Activating debounce\n");
			gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
		}
	} else {
		if (gpio_evmi->flags & GPIOKPF_DEBOUNCE) {
			printk(KERN_INFO PREFIX "Deactivating debounce\n");
			gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
		}
	}
#endif
}

static ssize_t store_debounce_delay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	long int delay;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%ld", &delay);
	set_debounce_delay(delay);

	return count;
}

static ssize_t show_settle_time(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->settle_time.tv.nsec / NSEC_PER_USEC));
}

static ssize_t store_settle_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	long int delay;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%ld", &delay);
	gpio_evmi->settle_time.tv.nsec = delay * NSEC_PER_USEC;

	return count;
}

static ssize_t show_poll_time(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->poll_time.tv.nsec / NSEC_PER_MSEC));
}

static ssize_t store_poll_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	long int delay;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%ld", &delay);
	gpio_evmi->poll_time.tv.nsec = delay * NSEC_PER_MSEC;

	return count;
}

static ssize_t show_flags(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "0x%x\n", gpio_evmi->flags);
}

static ssize_t store_flags(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned flags;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "0x%x", &flags);

	printk(KERN_INFO PREFIX "flags: 0x%x\n", flags);

	if (flags & GPIOKPF_DRIVE_INACTIVE)
		return count;

	gpio_evmi->flags = flags;

	return count;
}

static ssize_t show_debounce_flag(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DEBOUNCE) ? 1 : 0);
}

static ssize_t store_debounce_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned flag;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%u", &flag);

	if (flag) {
		gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
	}

	return count;
}

static ssize_t show_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0);
}

static ssize_t store_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned flag;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%u", &flag);

	if (flag) {
		gpio_evmi->flags |= GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
	}

	return count;
}

static ssize_t show_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS) ? 1 : 0);
}

static ssize_t store_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned flag;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%u", &flag);

	if (flag) {
		gpio_evmi->flags |= GPIOKPF_PRINT_UNMAPPED_KEYS;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS;
	}

	return count;
}

static ssize_t show_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_MAPPED_KEYS) ? 1 : 0);
}

static ssize_t store_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned flag;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%u", &flag);

	if (flag) {
		gpio_evmi->flags |= GPIOKPF_PRINT_MAPPED_KEYS;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS;
	}

	return count;
}

static ssize_t show_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf)
{
	if (!gpio_evmi) 
		return -ENODEV;

	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_PHANTOM_KEYS) ? 1 : 0);
}

static ssize_t store_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned flag;

	if (!gpio_evmi) 
		return -ENODEV;

	sscanf(buf, "%u", &flag);

	if (flag) {
		gpio_evmi->flags |= GPIOKPF_PRINT_PHANTOM_KEYS;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS;
	}

	return count;
}

static DEVICE_ATTR(debounce_delay, (S_IRUGO | S_IWUGO), show_debounce_delay, store_debounce_delay);
static DEVICE_ATTR(settle_time, (S_IRUGO | S_IWUGO), show_settle_time, store_settle_time);
static DEVICE_ATTR(poll_time, (S_IRUGO | S_IWUGO), show_poll_time, store_poll_time);
static DEVICE_ATTR(flags, (S_IRUGO), show_flags, store_flags);
static DEVICE_ATTR(debounce_flag, (S_IRUGO | S_IWUGO), show_debounce_flag, store_debounce_flag);
static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag);
static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag);
static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag);
static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag);

static void debounce_release(struct device *dev)
{
}

static struct device debounce_device = {
	.init_name = "debounce",
	.release = debounce_release,
};

static int __init debounce_init(void)
{
	struct device *event_dev = NULL;
	struct gpio_event_platform_data *gpio_epd;
	struct gpio_event_info *gpio_ei;
	int err = 0;

	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);

	err = device_register(&debounce_device);
	if (err) {
		return err;
	}

	err = device_create_file(&debounce_device, &dev_attr_debounce_delay);
	err = device_create_file(&debounce_device, &dev_attr_settle_time);
	err = device_create_file(&debounce_device, &dev_attr_poll_time);
	err = device_create_file(&debounce_device, &dev_attr_flags);
	err = device_create_file(&debounce_device, &dev_attr_debounce_flag);
	err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
	err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
	err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
	err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag);

	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_debounce_delay = gpio_evmi->debounce_delay;
	old_settle_time = gpio_evmi->settle_time;
	old_poll_time = gpio_evmi->poll_time;
	old_flags = gpio_evmi->flags;

	set_debounce_delay(debounce_delay);

	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_debounce_delay.tv.nsec) {
			printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
			gpio_evmi->debounce_delay = old_debounce_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);
		}
		gpio_evmi->settle_time = old_settle_time;
		gpio_evmi->poll_time = old_poll_time;
	}
	device_remove_file(&debounce_device, &dev_attr_debounce_delay);
	device_remove_file(&debounce_device, &dev_attr_settle_time);
	device_remove_file(&debounce_device, &dev_attr_poll_time);
	device_remove_file(&debounce_device, &dev_attr_flags);
	device_remove_file(&debounce_device, &dev_attr_debounce_flag);
	device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
	device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
	device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
	device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
	device_unregister(&debounce_device);
}

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
a4838b14	10	static unsigned old_flags = 0;
bb65757a MG	11	ktime_t old_debounce_delay;
	12	ktime_t old_settle_time;
	13	ktime_t old_poll_time;
1e65c113 MG	14	static struct gpio_event_matrix_info *gpio_evmi = NULL;
1e65c113 MG	15
b2b792eb	16	module_param(debounce_delay, int, S_IRUSR \| S_IRGRP \| S_IROTH);
a4838b14	17	MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 15");
ab5ed215 MG	18
ab5ed215 MG	19	static int find_ms2_dev(struct device dev, void data)
d1ff9643 MG	20	{
d1ff9643 MG	21	if (!strncmp((char)data, dev_name(dev), strlen((char)data))) {
ab5ed215	22	printk(KERN_INFO PREFIX "Found it\n");
d1ff9643 MG	23	return 1;
	24	}
	25	return 0;
	26	}
b422e333	27
f7cb07b2 MG	28	static ssize_t show_debounce_delay(struct device dev, struct device_attribute attr, char *buf)
	29	{
	30	if (!gpio_evmi)
	31	return -ENODEV;
	32
	33	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->debounce_delay.tv.nsec / NSEC_PER_MSEC));
	34	}
	35
	36	static void set_debounce_delay(long delay)
	37	{
	38	if (gpio_evmi->debounce_delay.tv.nsec != delay * NSEC_PER_MSEC) {
	39	printk(KERN_INFO PREFIX "Changing debounce_delay\n");
	40	gpio_evmi->debounce_delay.tv.nsec = delay * NSEC_PER_MSEC;
	41	debounce_delay = delay;
	42	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
	43	}
	44
fc215caa	45	#if 0
f7cb07b2 MG	46	if (gpio_evmi->debounce_delay.tv.nsec != 0) {
	47	if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
	48	printk(KERN_INFO PREFIX "Activating debounce\n");
	49	gpio_evmi->flags \|= GPIOKPF_DEBOUNCE;
	50	}
	51	} else {
	52	if (gpio_evmi->flags & GPIOKPF_DEBOUNCE) {
	53	printk(KERN_INFO PREFIX "Deactivating debounce\n");
	54	gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
	55	}
	56	}
fc215caa	57	#endif
f7cb07b2 MG	58	}
	59
	60	static ssize_t store_debounce_delay(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	61	{
	62	long int delay;
	63
	64	if (!gpio_evmi)
	65	return -ENODEV;
	66
	67	sscanf(buf, "%ld", &delay);
	68	set_debounce_delay(delay);
	69
fc215caa	70	return count;
f7cb07b2 MG	71	}
	72
	73	static ssize_t show_settle_time(struct device dev, struct device_attribute attr, char *buf)
	74	{
	75	if (!gpio_evmi)
	76	return -ENODEV;
	77
	78	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->settle_time.tv.nsec / NSEC_PER_USEC));
	79	}
	80
	81	static ssize_t store_settle_time(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	82	{
	83	long int delay;
	84
	85	if (!gpio_evmi)
	86	return -ENODEV;
	87
	88	sscanf(buf, "%ld", &delay);
	89	gpio_evmi->settle_time.tv.nsec = delay * NSEC_PER_USEC;
	90
fc215caa	91	return count;
f7cb07b2 MG	92	}
	93
	94	static ssize_t show_poll_time(struct device dev, struct device_attribute attr, char *buf)
	95	{
	96	if (!gpio_evmi)
	97	return -ENODEV;
	98
	99	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->poll_time.tv.nsec / NSEC_PER_MSEC));
	100	}
	101
	102	static ssize_t store_poll_time(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	103	{
	104	long int delay;
	105
	106	if (!gpio_evmi)
	107	return -ENODEV;
	108
	109	sscanf(buf, "%ld", &delay);
	110	gpio_evmi->poll_time.tv.nsec = delay * NSEC_PER_MSEC;
	111
fc215caa	112	return count;
f7cb07b2 MG	113	}
	114
	115	static ssize_t show_flags(struct device dev, struct device_attribute attr, char *buf)
	116	{
	117	if (!gpio_evmi)
	118	return -ENODEV;
	119
	120	return snprintf(buf, PAGE_SIZE, "0x%x\n", gpio_evmi->flags);
	121	}
	122
	123	static ssize_t store_flags(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	124	{
	125	unsigned flags;
	126
	127	if (!gpio_evmi)
	128	return -ENODEV;
	129
	130	sscanf(buf, "0x%x", &flags);
fc215caa MG	131
	132	printk(KERN_INFO PREFIX "flags: 0x%x\n", flags);
	133
	134	if (flags & GPIOKPF_DRIVE_INACTIVE)
	135	return count;
	136
f7cb07b2 MG	137	gpio_evmi->flags = flags;
f7cb07b2 MG	138
fc215caa MG	139	return count;
	140	}
	141
	142	static ssize_t show_debounce_flag(struct device dev, struct device_attribute attr, char *buf)
	143	{
	144	if (!gpio_evmi)
	145	return -ENODEV;
	146
	147	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DEBOUNCE) ? 1 : 0);
f7cb07b2 MG	148	}
f7cb07b2 MG	149
fc215caa MG	150	static ssize_t store_debounce_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	151	{
	152	unsigned flag;
	153
	154	if (!gpio_evmi)
	155	return -ENODEV;
	156
	157	sscanf(buf, "%u", &flag);
	158
	159	if (flag) {
	160	gpio_evmi->flags \|= GPIOKPF_DEBOUNCE;
	161	} else {
	162	gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
	163	}
	164
	165	return count;
	166	}
	167
	168	static ssize_t show_remove_some_phantom_keys_flag(struct device dev, struct device_attribute attr, char *buf)
	169	{
	170	if (!gpio_evmi)
	171	return -ENODEV;
	172
	173	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0);
	174	}
	175
	176	static ssize_t store_remove_some_phantom_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	177	{
	178	unsigned flag;
	179
	180	if (!gpio_evmi)
	181	return -ENODEV;
	182
	183	sscanf(buf, "%u", &flag);
	184
	185	if (flag) {
	186	gpio_evmi->flags \|= GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
	187	} else {
	188	gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
	189	}
	190
	191	return count;
	192	}
	193
	194	static ssize_t show_print_unmapped_keys_flag(struct device dev, struct device_attribute attr, char *buf)
	195	{
	196	if (!gpio_evmi)
	197	return -ENODEV;
	198
	199	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS) ? 1 : 0);
	200	}
	201
	202	static ssize_t store_print_unmapped_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	203	{
	204	unsigned flag;
	205
	206	if (!gpio_evmi)
	207	return -ENODEV;
	208
	209	sscanf(buf, "%u", &flag);
	210
	211	if (flag) {
	212	gpio_evmi->flags \|= GPIOKPF_PRINT_UNMAPPED_KEYS;
	213	} else {
214	gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS;
215	}
216
217	return count;
218	}
219
220	static ssize_t show_print_mapped_keys_flag(struct device dev, struct device_attribute attr, char *buf)
221	{
222	if (!gpio_evmi)
223	return -ENODEV;
224
225	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_MAPPED_KEYS) ? 1 : 0);
226	}
227
228	static ssize_t store_print_mapped_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
229	{
230	unsigned flag;
231
232	if (!gpio_evmi)
233	return -ENODEV;
234
235	sscanf(buf, "%u", &flag);
236
237	if (flag) {
238	gpio_evmi->flags \|= GPIOKPF_PRINT_MAPPED_KEYS;
239	} else {
240	gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS;
241	}
242
243	return count;
244	}
245
246	static ssize_t show_print_phantom_keys_flag(struct device dev, struct device_attribute attr, char *buf)
247	{
248	if (!gpio_evmi)
249	return -ENODEV;
250
251	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_PHANTOM_KEYS) ? 1 : 0);
252	}
253
254	static ssize_t store_print_phantom_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
255	{
256	unsigned flag;
257
258	if (!gpio_evmi)
259	return -ENODEV;
260
261	sscanf(buf, "%u", &flag);
262
263	if (flag) {
264	gpio_evmi->flags \|= GPIOKPF_PRINT_PHANTOM_KEYS;
265	} else {
266	gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS;
267	}
268
269	return count;
270	}
271
272	static DEVICE_ATTR(debounce_delay, (S_IRUGO \| S_IWUGO), show_debounce_delay, store_debounce_delay);
273	static DEVICE_ATTR(settle_time, (S_IRUGO \| S_IWUGO), show_settle_time, store_settle_time);
274	static DEVICE_ATTR(poll_time, (S_IRUGO \| S_IWUGO), show_poll_time, store_poll_time);
275	static DEVICE_ATTR(flags, (S_IRUGO), show_flags, store_flags);
276	static DEVICE_ATTR(debounce_flag, (S_IRUGO \| S_IWUGO), show_debounce_flag, store_debounce_flag);
277	static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO \| S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag);
278	static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO \| S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag);
279	static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO \| S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag);
280	static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO \| S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag);
f7cb07b2 MG	281
	282	static void debounce_release(struct device *dev)
	283	{
	284	}
	285
	286	static struct device debounce_device = {
	287	.init_name = "debounce",
	288	.release = debounce_release,
	289	};
	290
b422e333 MG	291	static int __init debounce_init(void)
b422e333 MG	292	{
d1ff9643 MG	293	struct device *event_dev = NULL;
	294	struct gpio_event_platform_data *gpio_epd;
	295	struct gpio_event_info *gpio_ei;
f7cb07b2	296	int err = 0;
d1ff9643	297
ab5ed215	298	printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
d1ff9643 MG	299
	300	event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
	301	if (event_dev == NULL)
	302	return -ENODEV;
	303
	304	gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
ab5ed215	305	printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
d1ff9643 MG	306	if (strcmp(gpio_epd->name, "sholes-keypad"))
	307	return -ENODEV;
	308
	309	gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
	310	gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);
	311
f7cb07b2 MG	312	err = device_register(&debounce_device);
	313	if (err) {
	314	return err;
	315	}
	316
	317	err = device_create_file(&debounce_device, &dev_attr_debounce_delay);
	318	err = device_create_file(&debounce_device, &dev_attr_settle_time);
	319	err = device_create_file(&debounce_device, &dev_attr_poll_time);
	320	err = device_create_file(&debounce_device, &dev_attr_flags);
fc215caa MG	321	err = device_create_file(&debounce_device, &dev_attr_debounce_flag);
	322	err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
	323	err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
	324	err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
	325	err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
f7cb07b2	326
ab5ed215 MG	327	printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
	328	printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
	329	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
	330	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
20bf1c9e	331
bb65757a MG	332	old_debounce_delay = gpio_evmi->debounce_delay;
	333	old_settle_time = gpio_evmi->settle_time;
	334	old_poll_time = gpio_evmi->poll_time;
	335	old_flags = gpio_evmi->flags;
1e65c113	336
f7cb07b2	337	set_debounce_delay(debounce_delay);
fc215caa	338
a4838b14 MG	339	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
a4838b14 MG	340
b422e333 MG	341	return 0;
	342	}
	343
	344	static void __exit debounce_exit(void)
	345	{
1e65c113	346	if (gpio_evmi) {
bb65757a	347	if (gpio_evmi->debounce_delay.tv.nsec != old_debounce_delay.tv.nsec) {
1e65c113	348	printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
bb65757a	349	gpio_evmi->debounce_delay = old_debounce_delay;
1e65c113 MG	350	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
1e65c113 MG	351	}
a4838b14 MG	352	if (gpio_evmi->flags != old_flags) {
	353	printk(KERN_INFO PREFIX "Restoring flags\n");
	354	gpio_evmi->flags = old_flags;
	355	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
	356	}
bb65757a MG	357	gpio_evmi->settle_time = old_settle_time;
bb65757a MG	358	gpio_evmi->poll_time = old_poll_time;
1e65c113	359	}
f7cb07b2 MG	360	device_remove_file(&debounce_device, &dev_attr_debounce_delay);
	361	device_remove_file(&debounce_device, &dev_attr_settle_time);
	362	device_remove_file(&debounce_device, &dev_attr_poll_time);
	363	device_remove_file(&debounce_device, &dev_attr_flags);
fc215caa MG	364	device_remove_file(&debounce_device, &dev_attr_debounce_flag);
	365	device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
	366	device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
	367	device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
	368	device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
f7cb07b2	369	device_unregister(&debounce_device);
b422e333 MG	370	}
	371
	372	module_init(debounce_init);
	373	module_exit(debounce_exit);
	374
	375	MODULE_LICENSE("GPL");
	376	MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");