#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio_event.h>
+#include <mach/gpio.h>
+
+/* hardware debounce: (value + 1) * 31us */
+#define GPIO_DEBOUNCE_TIME 0x1
+
+#define PREFIX "debounce: "
+
+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;
+
+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;
+ 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;
+ }
+
+ 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 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(drive_inactive_flag, (S_IRUGO | S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag);
+
+static void debounce_release(struct device *dev)
+{
+}
+
+static struct device debounce_device = {
+ .init_name = "debounce",
+ .release = debounce_release,
+};
+
+static void hw_debounce_pin(int gpio, int enable) {
+ printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio);
+ if (enable)
+ omap_set_gpio_debounce_time(gpio, GPIO_DEBOUNCE_TIME);
+ omap_set_gpio_debounce(gpio, enable);
+}
+
+static void hw_debounce(int enable) {
+ int i;
+
+ if (gpio_evmi == NULL)
+ return;
+
+ for (i = 0; i < gpio_evmi->ninputs; i++) {
+ hw_debounce_pin(gpio_evmi->input_gpios[i], enable);
+ }
+}
static int __init debounce_init(void)
{
- printk(KERN_INFO "Hello Milestone2!\n");
+ 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;
+ }
+
+ hw_debounce(1);
+
+ 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_drive_inactive_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;
+
+ 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;
+ }
+ hw_debounce(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_drive_inactive_flag);
+ device_unregister(&debounce_device);
}
module_init(debounce_init);
projects / ms2-fixes / blobdiff