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gpio-button-hotplug: improve gpio button debouncing, verify state changes over multiple polls. fixes spurious failsafe triggers (#13784) 

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37090 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2013-06-29 19:01:49 +00:00
parent 6f085ea93a
commit ca73ec3ee3
1 changed files with 8 additions and 6 deletions
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14
package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c
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@ -274,10 +274,16 @@ static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
if (state != bdata->last_state) {
unsigned int type = button->type ?: EV_KEY;
if (bdata->count < bdata->threshold) {
bdata->count++;
return;
}
button_hotplug_event(bdata, type, button->code, state);
bdata->count = 0;
bdata->last_state = state;
}
bdata->count = 0;
}
static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev)
@ -299,11 +305,7 @@ static void gpio_keys_polled_poll(struct work_struct *work)
for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[i];
if (bdata->count < bdata->threshold)
bdata->count++;
else
gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
}
gpio_keys_polled_queue_work(bdev);
}