deactivate debounce when delay is 0

[ms2-fixes] / debounce.c

diff --git a/debounce.c b/debounce.c
index 8e135205bb68bc39b719615324a418f0ec4c724d..852118f020e8a3449fe52c6e1252f7898c1b99c9 100644 (file)
--- a/debounce.c
+++ b/debounce.c
@@ -1,13 +1,94 @@
 #include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/gpio_event.h>
+
+#define PREFIX "debounce: "
+
+static int debounce_delay = 15;
+
+static int old_delay = 0;
+static unsigned old_flags = 0;
+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 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 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;
+
+       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);
+
+       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_delay = gpio_evmi->debounce_delay.tv.nsec;
+
+       if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) {
+               printk(KERN_INFO PREFIX "Changing debounce_delay\n");
+               gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC;
+               printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec);
+       }
+
+       old_flags = gpio_evmi->flags;
+
+       if (gpio_evmi->debounce_delay.tv.nsec != 0) {
+               /* 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;
+               }
+       } else {
+               /* Deactivating GPIOKPF_DEBOUNCE */
+               printk(KERN_INFO PREFIX "Deactivating debounce\n");
+               gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE;
+       }
+       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_delay) {
+                       printk(KERN_INFO PREFIX "Restoring debounce_delay\n");
+                       gpio_evmi->debounce_delay.tv.nsec = old_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);
+               }
+       }
 }
 
 module_init(debounce_init);