[ms2-fixes] / debounce.c

#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio_event.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <mach/gpio.h>

#define PREFIX "debounce: "

static unsigned old_flags = 0;
static ktime_t old_debounce_delay;
static ktime_t old_settle_time;
static ktime_t old_poll_time;
static struct gpio_event_matrix_info *gpio_evmi = NULL;
static int hw_debounce = 0;
static int hw_debounce_time = 0;

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;
}

/* hardware debounce: (time + 1) * 31us */
static void hw_debounce_set(int enable, int time) {
	int i;

	if (gpio_evmi == NULL)
		return;

	for (i = 0; i < gpio_evmi->ninputs; i++) {
		int gpio = gpio_evmi->input_gpios[i];

		if ((time != -1) && (time != hw_debounce_time) && hw_debounce) {
			printk(KERN_INFO PREFIX "Setting hardware debounce time for GPIO %d to %d (%dus)\n", gpio, time, (time+1)*31);
			omap_set_gpio_debounce_time(gpio, time);
		}

		if ((enable != -1) && (enable != hw_debounce)) {
			printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio);
			omap_set_gpio_debounce(gpio, enable);
		}
	}
}

static void set_irq_types(void) {
	int err;
	unsigned int irq;
	unsigned long type;
	int i;

	if (gpio_evmi == NULL)
		return;

	switch (gpio_evmi->flags & (GPIOKPF_ACTIVE_HIGH|GPIOKPF_LEVEL_TRIGGERED_IRQ)) {
	default:
		type = IRQ_TYPE_EDGE_FALLING;
		break;
	case GPIOKPF_ACTIVE_HIGH:
		type = IRQ_TYPE_EDGE_RISING;
		break;
	case GPIOKPF_LEVEL_TRIGGERED_IRQ:
		type = IRQ_TYPE_LEVEL_LOW;
		break;
	case GPIOKPF_LEVEL_TRIGGERED_IRQ | GPIOKPF_ACTIVE_HIGH:
		type = IRQ_TYPE_LEVEL_HIGH;
		break;
	}

	printk(KERN_INFO PREFIX "Settinhg IRQ type to 0x%lx\n", type);

	for (i = 0; i < gpio_evmi->ninputs; i++) {

		err = irq = gpio_to_irq(gpio_evmi->input_gpios[i]);

		if (err < 0)
			return;

		err = set_irq_type(irq, type);
	}
}

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;
		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);

	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 ssize_t show_active_high_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_ACTIVE_HIGH) ? 1 : 0);
}

static ssize_t store_active_high_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_ACTIVE_HIGH;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_ACTIVE_HIGH;
	}

	set_irq_types();

	return count;
}

static ssize_t show_level_triggered_irq_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_LEVEL_TRIGGERED_IRQ) ? 1 : 0);
}

static ssize_t store_level_triggered_irq_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_LEVEL_TRIGGERED_IRQ;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_LEVEL_TRIGGERED_IRQ;
	}

	set_irq_types();

	return count;
}

static ssize_t show_drive_inactive_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_DRIVE_INACTIVE) ? 1 : 0);
}

static ssize_t store_drive_inactive_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_DRIVE_INACTIVE;
	} else {
		gpio_evmi->flags &= ~GPIOKPF_DRIVE_INACTIVE;
	}

	return count;
}

static ssize_t show_hw_debounce(struct device *dev, struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce);
}

static ssize_t store_hw_debounce(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	int enable;

	sscanf(buf, "%d", &enable);

	if (enable) {
		hw_debounce_set(1, -1);
		hw_debounce = 1;
	}
	else {
		hw_debounce_set(-1, 0);
		hw_debounce_set(0, -1);
		hw_debounce = 0;
		hw_debounce_time = 0;
	}

	return count;
}

static ssize_t show_hw_debounce_time(struct device *dev, struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce_time);
}

static ssize_t store_hw_debounce_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	int time;

	sscanf(buf, "%d", &time);

	if ((time < 0) || (time > 0xff))
		return count;

	if (!hw_debounce)
		return count;

	hw_debounce_set(-1, time);
	hw_debounce_time = time;

	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 DEVICE_ATTR(active_high_flag, (S_IRUGO), show_active_high_flag, store_active_high_flag);
static DEVICE_ATTR(level_triggered_irq_flag, (S_IRUGO | S_IWUGO), show_level_triggered_irq_flag, store_level_triggered_irq_flag);
static DEVICE_ATTR(drive_inactive_flag, (S_IRUGO | S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag);
static DEVICE_ATTR(hw_debounce, (S_IRUGO | S_IWUGO), show_hw_debounce, store_hw_debounce);
static DEVICE_ATTR(hw_debounce_time, (S_IRUGO | S_IWUGO), show_hw_debounce_time, store_hw_debounce_time);

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);
	err = device_create_file(&debounce_device, &dev_attr_active_high_flag);
	err = device_create_file(&debounce_device, &dev_attr_level_triggered_irq_flag);
	err = device_create_file(&debounce_device, &dev_attr_drive_inactive_flag);
	err = device_create_file(&debounce_device, &dev_attr_hw_debounce);
	err = device_create_file(&debounce_device, &dev_attr_hw_debounce_time);

	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;

	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);
			set_irq_types();
		}
		gpio_evmi->settle_time = old_settle_time;
		gpio_evmi->poll_time = old_poll_time;
	}
	hw_debounce_set(0, 0);
	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_remove_file(&debounce_device, &dev_attr_active_high_flag);
	device_remove_file(&debounce_device, &dev_attr_level_triggered_irq_flag);
	device_remove_file(&debounce_device, &dev_attr_drive_inactive_flag);
	device_remove_file(&debounce_device, &dev_attr_hw_debounce);
	device_remove_file(&debounce_device, &dev_attr_hw_debounce_time);
	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>
f4286301 MG	5	#include <linux/interrupt.h>
f4286301 MG	6	#include <linux/irq.h>
62a453fc MG	7	#include <mach/gpio.h>
62a453fc MG	8
ab5ed215 MG	9	#define PREFIX "debounce: "
ab5ed215 MG	10
a4838b14	11	static unsigned old_flags = 0;
29bad272 MG	12	static ktime_t old_debounce_delay;
	13	static ktime_t old_settle_time;
	14	static ktime_t old_poll_time;
1e65c113	15	static struct gpio_event_matrix_info *gpio_evmi = NULL;
29bad272 MG	16	static int hw_debounce = 0;
29bad272 MG	17	static int hw_debounce_time = 0;
1e65c113	18
ab5ed215	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
29bad272 MG	28	/* hardware debounce: (time + 1) * 31us */
	29	static void hw_debounce_set(int enable, int time) {
	30	int i;
	31
	32	if (gpio_evmi == NULL)
	33	return;
	34
	35	for (i = 0; i < gpio_evmi->ninputs; i++) {
	36	int gpio = gpio_evmi->input_gpios[i];
	37
308fc1a5	38	if ((time != -1) && (time != hw_debounce_time) && hw_debounce) {
5df3a8e0	39	printk(KERN_INFO PREFIX "Setting hardware debounce time for GPIO %d to %d (%dus)\n", gpio, time, (time+1)*31);
29bad272 MG	40	omap_set_gpio_debounce_time(gpio, time);
29bad272 MG	41	}
308fc1a5 MG	42
	43	if ((enable != -1) && (enable != hw_debounce)) {
	44	printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio);
	45	omap_set_gpio_debounce(gpio, enable);
	46	}
29bad272 MG	47	}
	48	}
	49
f4286301 MG	50	static void set_irq_types(void) {
	51	int err;
	52	unsigned int irq;
	53	unsigned long type;
	54	int i;
	55
	56	if (gpio_evmi == NULL)
	57	return;
	58
	59	switch (gpio_evmi->flags & (GPIOKPF_ACTIVE_HIGH\|GPIOKPF_LEVEL_TRIGGERED_IRQ)) {
	60	default:
	61	type = IRQ_TYPE_EDGE_FALLING;
	62	break;
	63	case GPIOKPF_ACTIVE_HIGH:
	64	type = IRQ_TYPE_EDGE_RISING;
	65	break;
	66	case GPIOKPF_LEVEL_TRIGGERED_IRQ:
	67	type = IRQ_TYPE_LEVEL_LOW;
	68	break;
	69	case GPIOKPF_LEVEL_TRIGGERED_IRQ \| GPIOKPF_ACTIVE_HIGH:
	70	type = IRQ_TYPE_LEVEL_HIGH;
	71	break;
	72	}
	73
	74	printk(KERN_INFO PREFIX "Settinhg IRQ type to 0x%lx\n", type);
	75
	76	for (i = 0; i < gpio_evmi->ninputs; i++) {
	77
	78	err = irq = gpio_to_irq(gpio_evmi->input_gpios[i]);
	79
	80	if (err < 0)
	81	return;
	82
	83	err = set_irq_type(irq, type);
	84	}
	85	}
29bad272	86
f7cb07b2 MG	87	static ssize_t show_debounce_delay(struct device dev, struct device_attribute attr, char *buf)
	88	{
	89	if (!gpio_evmi)
	90	return -ENODEV;
	91
	92	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->debounce_delay.tv.nsec / NSEC_PER_MSEC));
	93	}
	94
	95	static void set_debounce_delay(long delay)
	96	{
	97	if (gpio_evmi->debounce_delay.tv.nsec != delay * NSEC_PER_MSEC) {
	98	printk(KERN_INFO PREFIX "Changing debounce_delay\n");
	99	gpio_evmi->debounce_delay.tv.nsec = delay * NSEC_PER_MSEC;
f7cb07b2 MG	100	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
	101	}
	102
fc215caa	103	#if 0
f7cb07b2 MG	104	if (gpio_evmi->debounce_delay.tv.nsec != 0) {
	105	if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
	106	printk(KERN_INFO PREFIX "Activating debounce\n");
	107	gpio_evmi->flags \|= GPIOKPF_DEBOUNCE;
	108	}
	109	} else {
	110	if (gpio_evmi->flags & GPIOKPF_DEBOUNCE) {
	111	printk(KERN_INFO PREFIX "Deactivating debounce\n");
	112	gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
	113	}
	114	}
fc215caa	115	#endif
f7cb07b2 MG	116	}
	117
	118	static ssize_t store_debounce_delay(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	119	{
	120	long int delay;
	121
	122	if (!gpio_evmi)
	123	return -ENODEV;
	124
	125	sscanf(buf, "%ld", &delay);
	126	set_debounce_delay(delay);
	127
fc215caa	128	return count;
f7cb07b2 MG	129	}
	130
	131	static ssize_t show_settle_time(struct device dev, struct device_attribute attr, char *buf)
	132	{
	133	if (!gpio_evmi)
	134	return -ENODEV;
	135
	136	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->settle_time.tv.nsec / NSEC_PER_USEC));
	137	}
	138
	139	static ssize_t store_settle_time(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	140	{
	141	long int delay;
	142
	143	if (!gpio_evmi)
	144	return -ENODEV;
	145
	146	sscanf(buf, "%ld", &delay);
	147	gpio_evmi->settle_time.tv.nsec = delay * NSEC_PER_USEC;
	148
fc215caa	149	return count;
f7cb07b2 MG	150	}
	151
	152	static ssize_t show_poll_time(struct device dev, struct device_attribute attr, char *buf)
	153	{
	154	if (!gpio_evmi)
	155	return -ENODEV;
	156
	157	return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->poll_time.tv.nsec / NSEC_PER_MSEC));
	158	}
	159
	160	static ssize_t store_poll_time(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	161	{
	162	long int delay;
	163
	164	if (!gpio_evmi)
	165	return -ENODEV;
	166
	167	sscanf(buf, "%ld", &delay);
	168	gpio_evmi->poll_time.tv.nsec = delay * NSEC_PER_MSEC;
	169
fc215caa	170	return count;
f7cb07b2 MG	171	}
	172
	173	static ssize_t show_flags(struct device dev, struct device_attribute attr, char *buf)
	174	{
	175	if (!gpio_evmi)
	176	return -ENODEV;
	177
	178	return snprintf(buf, PAGE_SIZE, "0x%x\n", gpio_evmi->flags);
	179	}
	180
	181	static ssize_t store_flags(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	182	{
	183	unsigned flags;
	184
	185	if (!gpio_evmi)
	186	return -ENODEV;
	187
	188	sscanf(buf, "0x%x", &flags);
fc215caa MG	189
	190	printk(KERN_INFO PREFIX "flags: 0x%x\n", flags);
	191
f7cb07b2 MG	192	gpio_evmi->flags = flags;
f7cb07b2 MG	193
fc215caa MG	194	return count;
	195	}
	196
	197	static ssize_t show_debounce_flag(struct device dev, struct device_attribute attr, char *buf)
	198	{
	199	if (!gpio_evmi)
	200	return -ENODEV;
	201
	202	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DEBOUNCE) ? 1 : 0);
f7cb07b2 MG	203	}
f7cb07b2 MG	204
fc215caa MG	205	static ssize_t store_debounce_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	206	{
	207	unsigned flag;
	208
	209	if (!gpio_evmi)
	210	return -ENODEV;
	211
	212	sscanf(buf, "%u", &flag);
	213
	214	if (flag) {
	215	gpio_evmi->flags \|= GPIOKPF_DEBOUNCE;
	216	} else {
	217	gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
	218	}
	219
	220	return count;
	221	}
	222
	223	static ssize_t show_remove_some_phantom_keys_flag(struct device dev, struct device_attribute attr, char *buf)
	224	{
	225	if (!gpio_evmi)
	226	return -ENODEV;
	227
	228	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0);
	229	}
	230
	231	static ssize_t store_remove_some_phantom_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	232	{
	233	unsigned flag;
	234
	235	if (!gpio_evmi)
	236	return -ENODEV;
	237
	238	sscanf(buf, "%u", &flag);
	239
	240	if (flag) {
	241	gpio_evmi->flags \|= GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
	242	} else {
	243	gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS;
	244	}
	245
	246	return count;
	247	}
	248
	249	static ssize_t show_print_unmapped_keys_flag(struct device dev, struct device_attribute attr, char *buf)
	250	{
	251	if (!gpio_evmi)
	252	return -ENODEV;
	253
	254	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS) ? 1 : 0);
	255	}
	256
	257	static ssize_t store_print_unmapped_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	258	{
	259	unsigned flag;
	260
	261	if (!gpio_evmi)
	262	return -ENODEV;
	263
	264	sscanf(buf, "%u", &flag);
	265
	266	if (flag) {
	267	gpio_evmi->flags \|= GPIOKPF_PRINT_UNMAPPED_KEYS;
	268	} else {
269	gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS;
270	}
271
272	return count;
273	}
274
275	static ssize_t show_print_mapped_keys_flag(struct device dev, struct device_attribute attr, char *buf)
276	{
277	if (!gpio_evmi)
278	return -ENODEV;
279
280	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_MAPPED_KEYS) ? 1 : 0);
281	}
282
283	static ssize_t store_print_mapped_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
284	{
285	unsigned flag;
286
287	if (!gpio_evmi)
288	return -ENODEV;
289
290	sscanf(buf, "%u", &flag);
291
292	if (flag) {
293	gpio_evmi->flags \|= GPIOKPF_PRINT_MAPPED_KEYS;
294	} else {
295	gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS;
296	}
297
298	return count;
299	}
300
301	static ssize_t show_print_phantom_keys_flag(struct device dev, struct device_attribute attr, char *buf)
302	{
303	if (!gpio_evmi)
304	return -ENODEV;
305
306	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_PHANTOM_KEYS) ? 1 : 0);
307	}
308
309	static ssize_t store_print_phantom_keys_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
310	{
311	unsigned flag;
312
313	if (!gpio_evmi)
314	return -ENODEV;
315
316	sscanf(buf, "%u", &flag);
317
318	if (flag) {
319	gpio_evmi->flags \|= GPIOKPF_PRINT_PHANTOM_KEYS;
320	} else {
321	gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS;
322	}
323
324	return count;
325	}
326
a2485674 MG	327	static ssize_t show_active_high_flag(struct device dev, struct device_attribute attr, char *buf)
	328	{
	329	if (!gpio_evmi)
	330	return -ENODEV;
	331
	332	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_ACTIVE_HIGH) ? 1 : 0);
	333	}
	334
	335	static ssize_t store_active_high_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	336	{
	337	unsigned flag;
	338
	339	if (!gpio_evmi)
	340	return -ENODEV;
	341
	342	sscanf(buf, "%u", &flag);
	343
	344	if (flag) {
	345	gpio_evmi->flags \|= GPIOKPF_ACTIVE_HIGH;
	346	} else {
	347	gpio_evmi->flags &= ~GPIOKPF_ACTIVE_HIGH;
	348	}
	349
f4286301 MG	350	set_irq_types();
	351
	352	return count;
	353	}
	354
	355	static ssize_t show_level_triggered_irq_flag(struct device dev, struct device_attribute attr, char *buf)
	356	{
	357	if (!gpio_evmi)
	358	return -ENODEV;
	359
	360	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_LEVEL_TRIGGERED_IRQ) ? 1 : 0);
	361	}
	362
	363	static ssize_t store_level_triggered_irq_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	364	{
	365	unsigned flag;
	366
	367	if (!gpio_evmi)
	368	return -ENODEV;
	369
	370	sscanf(buf, "%u", &flag);
	371
	372	if (flag) {
	373	gpio_evmi->flags \|= GPIOKPF_LEVEL_TRIGGERED_IRQ;
	374	} else {
	375	gpio_evmi->flags &= ~GPIOKPF_LEVEL_TRIGGERED_IRQ;
	376	}
	377
	378	set_irq_types();
	379
a2485674 MG	380	return count;
	381	}
	382
	383	static ssize_t show_drive_inactive_flag(struct device dev, struct device_attribute attr, char *buf)
	384	{
	385	if (!gpio_evmi)
	386	return -ENODEV;
	387
	388	return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DRIVE_INACTIVE) ? 1 : 0);
	389	}
	390
	391	static ssize_t store_drive_inactive_flag(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	392	{
	393	unsigned flag;
	394
	395	if (!gpio_evmi)
	396	return -ENODEV;
	397
	398	sscanf(buf, "%u", &flag);
	399
	400	if (flag) {
	401	gpio_evmi->flags \|= GPIOKPF_DRIVE_INACTIVE;
	402	} else {
	403	gpio_evmi->flags &= ~GPIOKPF_DRIVE_INACTIVE;
	404	}
	405
	406	return count;
	407	}
	408
29bad272 MG	409	static ssize_t show_hw_debounce(struct device dev, struct device_attribute attr, char *buf)
	410	{
	411	return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce);
	412	}
	413
	414	static ssize_t store_hw_debounce(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	415	{
	416	int enable;
	417
	418	sscanf(buf, "%d", &enable);
	419
	420	if (enable) {
	421	hw_debounce_set(1, -1);
	422	hw_debounce = 1;
	423	}
	424	else {
c0cd650e	425	hw_debounce_set(-1, 0);
29bad272 MG	426	hw_debounce_set(0, -1);
29bad272 MG	427	hw_debounce = 0;
c0cd650e	428	hw_debounce_time = 0;
29bad272 MG	429	}
	430
	431	return count;
	432	}
	433
	434	static ssize_t show_hw_debounce_time(struct device dev, struct device_attribute attr, char *buf)
	435	{
	436	return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce_time);
	437	}
	438
	439	static ssize_t store_hw_debounce_time(struct device dev, struct device_attribute attr, const char *buf, size_t count)
	440	{
	441	int time;
	442
	443	sscanf(buf, "%d", &time);
	444
	445	if ((time < 0) \|\| (time > 0xff))
	446	return count;
	447
8440ec7c MG	448	if (!hw_debounce)
	449	return count;
	450
29bad272 MG	451	hw_debounce_set(-1, time);
	452	hw_debounce_time = time;
	453
	454	return count;
	455	}
	456
fc215caa MG	457	static DEVICE_ATTR(debounce_delay, (S_IRUGO \| S_IWUGO), show_debounce_delay, store_debounce_delay);
	458	static DEVICE_ATTR(settle_time, (S_IRUGO \| S_IWUGO), show_settle_time, store_settle_time);
	459	static DEVICE_ATTR(poll_time, (S_IRUGO \| S_IWUGO), show_poll_time, store_poll_time);
	460	static DEVICE_ATTR(flags, (S_IRUGO), show_flags, store_flags);
	461	static DEVICE_ATTR(debounce_flag, (S_IRUGO \| S_IWUGO), show_debounce_flag, store_debounce_flag);
	462	static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO \| S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag);
	463	static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO \| S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag);
	464	static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO \| S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag);
	465	static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO \| S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag);
a2485674	466	static DEVICE_ATTR(active_high_flag, (S_IRUGO), show_active_high_flag, store_active_high_flag);
f4286301	467	static DEVICE_ATTR(level_triggered_irq_flag, (S_IRUGO \| S_IWUGO), show_level_triggered_irq_flag, store_level_triggered_irq_flag);
a2485674	468	static DEVICE_ATTR(drive_inactive_flag, (S_IRUGO \| S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag);
29bad272 MG	469	static DEVICE_ATTR(hw_debounce, (S_IRUGO \| S_IWUGO), show_hw_debounce, store_hw_debounce);
29bad272 MG	470	static DEVICE_ATTR(hw_debounce_time, (S_IRUGO \| S_IWUGO), show_hw_debounce_time, store_hw_debounce_time);
f7cb07b2 MG	471
	472	static void debounce_release(struct device *dev)
	473	{
	474	}
	475
	476	static struct device debounce_device = {
	477	.init_name = "debounce",
	478	.release = debounce_release,
	479	};
	480
b422e333 MG	481	static int __init debounce_init(void)
b422e333 MG	482	{
d1ff9643 MG	483	struct device *event_dev = NULL;
	484	struct gpio_event_platform_data *gpio_epd;
	485	struct gpio_event_info *gpio_ei;
f7cb07b2	486	int err = 0;
d1ff9643	487
ab5ed215	488	printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n");
d1ff9643 MG	489
	490	event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev);
	491	if (event_dev == NULL)
	492	return -ENODEV;
	493
	494	gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
ab5ed215	495	printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name);
d1ff9643 MG	496	if (strcmp(gpio_epd->name, "sholes-keypad"))
	497	return -ENODEV;
	498
	499	gpio_ei = (struct gpio_event_info*)gpio_epd->info[0];
	500	gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info);
	501
f7cb07b2 MG	502	err = device_register(&debounce_device);
	503	if (err) {
	504	return err;
	505	}
	506
	507	err = device_create_file(&debounce_device, &dev_attr_debounce_delay);
	508	err = device_create_file(&debounce_device, &dev_attr_settle_time);
	509	err = device_create_file(&debounce_device, &dev_attr_poll_time);
	510	err = device_create_file(&debounce_device, &dev_attr_flags);
fc215caa MG	511	err = device_create_file(&debounce_device, &dev_attr_debounce_flag);
	512	err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
	513	err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
	514	err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
	515	err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
a2485674	516	err = device_create_file(&debounce_device, &dev_attr_active_high_flag);
f4286301	517	err = device_create_file(&debounce_device, &dev_attr_level_triggered_irq_flag);
a2485674	518	err = device_create_file(&debounce_device, &dev_attr_drive_inactive_flag);
29bad272 MG	519	err = device_create_file(&debounce_device, &dev_attr_hw_debounce);
29bad272 MG	520	err = device_create_file(&debounce_device, &dev_attr_hw_debounce_time);
f7cb07b2	521
ab5ed215 MG	522	printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
	523	printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
	524	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
	525	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
20bf1c9e	526
bb65757a MG	527	old_debounce_delay = gpio_evmi->debounce_delay;
	528	old_settle_time = gpio_evmi->settle_time;
	529	old_poll_time = gpio_evmi->poll_time;
	530	old_flags = gpio_evmi->flags;
1e65c113	531
a4838b14 MG	532	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
a4838b14 MG	533
b422e333 MG	534	return 0;
	535	}
	536
	537	static void __exit debounce_exit(void)
	538	{
1e65c113	539	if (gpio_evmi) {
bb65757a	540	if (gpio_evmi->debounce_delay.tv.nsec != old_debounce_delay.tv.nsec) {
1e65c113	541	printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
bb65757a	542	gpio_evmi->debounce_delay = old_debounce_delay;
1e65c113 MG	543	printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
1e65c113 MG	544	}
a4838b14 MG	545	if (gpio_evmi->flags != old_flags) {
	546	printk(KERN_INFO PREFIX "Restoring flags\n");
	547	gpio_evmi->flags = old_flags;
	548	printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
f4286301	549	set_irq_types();
a4838b14	550	}
bb65757a MG	551	gpio_evmi->settle_time = old_settle_time;
bb65757a MG	552	gpio_evmi->poll_time = old_poll_time;
1e65c113	553	}
29bad272	554	hw_debounce_set(0, 0);
f7cb07b2 MG	555	device_remove_file(&debounce_device, &dev_attr_debounce_delay);
	556	device_remove_file(&debounce_device, &dev_attr_settle_time);
	557	device_remove_file(&debounce_device, &dev_attr_poll_time);
	558	device_remove_file(&debounce_device, &dev_attr_flags);
fc215caa MG	559	device_remove_file(&debounce_device, &dev_attr_debounce_flag);
	560	device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag);
	561	device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag);
	562	device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag);
	563	device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
a2485674	564	device_remove_file(&debounce_device, &dev_attr_active_high_flag);
f4286301	565	device_remove_file(&debounce_device, &dev_attr_level_triggered_irq_flag);
a2485674	566	device_remove_file(&debounce_device, &dev_attr_drive_inactive_flag);
29bad272 MG	567	device_remove_file(&debounce_device, &dev_attr_hw_debounce);
29bad272 MG	568	device_remove_file(&debounce_device, &dev_attr_hw_debounce_time);
f7cb07b2	569	device_unregister(&debounce_device);
b422e333 MG	570	}
	571
	572	module_init(debounce_init);
	573	module_exit(debounce_exit);
	574
	575	MODULE_LICENSE("GPL");
	576	MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");