set keypad debounce time to 5 ms
authorMichael Gernoth <michael@gernoth.net>
Wed, 18 May 2011 21:17:04 +0000 (23:17 +0200)
committerMichael Gernoth <michael@gernoth.net>
Wed, 18 May 2011 21:17:04 +0000 (23:17 +0200)
debounce.c

index 8e13520..ec20fdb 100644 (file)
@@ -1,8 +1,48 @@
 #include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio_event.h>
+
+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");
+               return 1;
+       }
+       return 0;
+}
 
 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;
+       struct gpio_event_matrix_info *gpio_evmi;
+
+       printk(KERN_INFO "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 "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);
+       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 "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
+       }
+
        return 0;
 }
 
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