Check Change state and only read device when required.
Signed-off-by: Joo Aun Saw <jasaw81@xxxxxxxxx>
---
drivers/input/keyboard/qt2160.c | 12 ++++++++++++
include/linux/input/qt2160.h | 5 +++++
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/input/keyboard/qt2160.c b/drivers/input/keyboard/qt2160.c
index 7647849..8316fde 100755
--- a/drivers/input/keyboard/qt2160.c
+++ b/drivers/input/keyboard/qt2160.c
@@ -213,6 +213,12 @@ static irqreturn_t qt2160_irq(int irq, void *_qt2160)
struct qt2160_data *qt2160 = _qt2160;
unsigned long flags;
+ if (qt2160->hw_info->getchange) {
+ /* if change is not active, no IRQ to service */
+ if (qt2160->hw_info->getchange(qt2160->hw_info->data) > 0)
+ return IRQ_HANDLED;
+ }
+
spin_lock_irqsave(&qt2160->lock, flags);
__cancel_delayed_work(&qt2160->dwork);
@@ -225,6 +231,12 @@ static irqreturn_t qt2160_irq(int irq, void *_qt2160)
static void qt2160_schedule_read(struct qt2160_data *qt2160)
{
+ if (qt2160->hw_info->getchange) {
+ /* if change is not active, no need to read device */
+ if (qt2160->hw_info->getchange(qt2160->hw_info->data) > 0)
+ return;
+ }
+
spin_lock_irq(&qt2160->lock);
schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
spin_unlock_irq(&qt2160->lock);
diff --git a/include/linux/input/qt2160.h b/include/linux/input/qt2160.h
index 8a1913f..4eb7e18 100755
--- a/include/linux/input/qt2160.h
+++ b/include/linux/input/qt2160.h
@@ -7,6 +7,9 @@
/**
* struct qt2160_info - defines the chip configuration
+ * @data: private data for lowlevel IO abstraction routines
+ * @getchange: return 0 when CHANGE pin is active/low; return 1 when CHANGE pin
+ * is deactivated/high
* @slider_length: number of keys to use as slider, max 8 keys, min 2 keys
* @slider_axis: absolute axis type, value 0 is ABS_X
* @keycodes: key codes for keys that are part of the slider are ignored; slider
@@ -20,6 +23,8 @@
* sleep 16ms longer before detecting a touch (slower response); max 255
*/
struct qt2160_info {
+ void *data;
+ int (*getchange) (void *data);
unsigned char slider_length;
unsigned int slider_axis;
unsigned short keycodes[QT2160_MAXKEYS];
--
1.7.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
