#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 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 ktime_t old_debounce_delay;
+static ktime_t old_settle_time;
+static ktime_t old_poll_time;
+static int (*old_sw_fixup)(int index);
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 hw_debounce = 0;
+static int hw_debounce_time = 0;
static int find_ms2_dev(struct device *dev, void *data)
{
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)
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);
}
printk(KERN_INFO PREFIX "flags: 0x%x\n", flags);
- if (flags & GPIOKPF_DRIVE_INACTIVE)
- return count;
-
gpio_evmi->flags = flags;
return count;
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(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 | S_IWUGO), 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);
+
+#if 0
+static int debounce_fixup(int index)
+{
+ int ret;
+
+ printk(KERN_INFO PREFIX "0x%x\n", index);
+
+ ret = old_sw_fixup(index);
+ if (!ret)
+ printk(KERN_INFO PREFIX "IGNORED!\n");
+
+ return ret;
+}
+#endif
static void debounce_release(struct device *dev)
{
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);
old_settle_time = gpio_evmi->settle_time;
old_poll_time = gpio_evmi->poll_time;
old_flags = gpio_evmi->flags;
+ old_sw_fixup = gpio_evmi->sw_fixup;
- set_debounce_delay(debounce_delay);
-
- printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
+#if 0
+ printk(KERN_INFO PREFIX "Registering fixup handler\n");
+ gpio_evmi->sw_fixup = debounce_fixup;
+#endif
return 0;
}
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;
+
+ if (gpio_evmi->sw_fixup != old_sw_fixup) {
+ printk(KERN_INFO PREFIX "Restoring fixup handler\n");
+ gpio_evmi->sw_fixup = old_sw_fixup;
+ }
}
+ 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_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);
}
projects / ms2-fixes / blobdiff