From: Michael Gernoth <michael@gernoth.net>
Date: Sun, 3 Jul 2011 10:50:28 +0000 (+0200)
Subject: deactivate debounce when delay is 0
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/ms2-fixes/commitdiff_plain/a4838b14f5c5bdb4ceda232aec01e695e56af575?hp=812e17bee320e4924b930186f825dfeda0ecdc35

deactivate debounce when delay is 0
---

diff --git a/debounce.c b/debounce.c
index 4006cd2..852118f 100644
--- a/debounce.c
+++ b/debounce.c
@@ -5,13 +5,14 @@
 
 #define PREFIX "debounce: "
 
-static int debounce_delay = 10;
+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: 10");
+MODULE_PARM_DESC(debounce_delay, "debouncing delay (ms), default: 15");
 
 static int find_ms2_dev(struct device *dev, void *data)
 {
@@ -48,13 +49,6 @@ static int __init debounce_init(void)
 	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 */
-	if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) {
-		printk(KERN_INFO PREFIX "Activating debounce\n");
-		gpio_evmi->flags |= GPIOKPF_DEBOUNCE;
-		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) {
@@ -63,6 +57,21 @@ static int __init debounce_init(void)
 		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;
 }
 
@@ -74,6 +83,11 @@ static void __exit debounce_exit(void)
 			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);
+		}
 	}
 }