make the debounce_delay modifiable via the "delay" module parameter
authorMichael Gernoth <michael@gernoth.net>
Fri, 20 May 2011 13:07:25 +0000 (15:07 +0200)
committerMichael Gernoth <michael@gernoth.net>
Fri, 20 May 2011 13:07:25 +0000 (15:07 +0200)
debounce.c

index 7489f8c..e6398dc 100644 (file)
@@ -3,10 +3,17 @@
 #include <linux/platform_device.h>
 #include <linux/gpio_event.h>
 
-int find_ms2_dev(struct device *dev, void *data)
+#define PREFIX "debounce: "
+
+static int delay = 5;
+
+module_param(delay, int, S_IRUSR | S_IRGRP | S_IROTH);
+MODULE_PARM_DESC(delay, "debouncing delay (ms), default: 5");
+
+static int find_ms2_dev(struct device *dev, void *data)
 {
        if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) {
-               printk(KERN_INFO "Found it!\n");
+               printk(KERN_INFO PREFIX "Found it\n");
                return 1;
        }
        return 0;
@@ -19,7 +26,7 @@ static int __init debounce_init(void)
        struct gpio_event_info *gpio_ei;
        struct gpio_event_matrix_info *gpio_evmi;
 
-       printk(KERN_INFO "Searching for " GPIO_EVENT_DEV_NAME "...\n");
+       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);
@@ -27,25 +34,29 @@ static int __init debounce_init(void)
                return -ENODEV;
 
        gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data;
-       printk(KERN_INFO "And there is a %s connected...\n", gpio_epd->name);
+       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 "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
-       printk(KERN_INFO "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
-       printk(KERN_INFO "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
-       printk(KERN_INFO "flags: %x\n", gpio_evmi->flags);
-       if (!gpio_evmi->debounce_delay.tv.nsec) {
-               printk(KERN_INFO "Activating debounce!\n");
-               gpio_evmi->debounce_delay.tv.nsec = 5 * NSEC_PER_MSEC;
+       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);
 
-               /* GPIOKPF_DEBOUNCE should already be set by GPIOKPF_REMOVE_PHANTOM_KEYS */
+       /* 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;
-               printk(KERN_INFO "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
-               printk(KERN_INFO "flags: %x\n", gpio_evmi->flags);
+               printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags);
+       }
+
+       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);
        }
 
        return 0;
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