From a4838b14f5c5bdb4ceda232aec01e695e56af575 Mon Sep 17 00:00:00 2001 From: Michael Gernoth Date: Sun, 3 Jul 2011 12:50:28 +0200 Subject: [PATCH] deactivate debounce when delay is 0 --- debounce.c | 32 +++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) 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); + } } } -- 2.39.2