The PENDOWN signal from the WM97xx touch screen controllers can be used
to generate a wakeup event when the system is suspended. Provide a new
machine configuration option 'suspend_mode' allowing machine drivers to
enable this. If no suspend_mode is provided then the touch panel will be
powered down when the system is suspended.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
drivers/input/touchscreen/wm97xx-core.c | 22 ++++++++++++++++++++++
include/linux/wm97xx.h | 3 +++
2 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index fec07c2..e1a1ca0 100644
--- a/drivers/input/touchscreen/wm97xx-core.c
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -689,10 +689,32 @@ static int wm97xx_remove(struct device *dev)
static int wm97xx_suspend(struct device *dev, pm_message_t state)
{
struct wm97xx *wm = dev_get_drvdata(dev);
+ u16 reg;
+ int suspend_mode;
+
+ if (wm->mach_ops)
+ suspend_mode = wm->mach_ops->suspend_mode;
+ else
+ suspend_mode = 0;
if (wm->input_dev->users)
cancel_delayed_work_sync(&wm->ts_reader);
+ /* Power down the digitiser (bypassing the cache for resume) */
+ reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
+ reg &= ~WM97XX_PRP_DET_DIG;
+ if (wm->input_dev->users && suspend_mode)
+ reg |= suspend_mode;
+ wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
+
+ /* WM9713 has an additional power bit - turn it off if there
+ * are no users or if suspend mode is zero. */
+ if (wm->id == WM9713_ID2 &&
+ (!wm->input_dev->users || !suspend_mode)) {
+ reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
+ wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
+ }
+
return 0;
}
diff --git a/include/linux/wm97xx.h b/include/linux/wm97xx.h
index ed01c7d..2082833 100644
--- a/include/linux/wm97xx.h
+++ b/include/linux/wm97xx.h
@@ -258,6 +258,9 @@ struct wm97xx_mach_ops {
/* pre and post sample - can be used to minimise any analog noise */
void (*pre_sample) (int); /* function to run before sampling */
void (*post_sample) (int); /* function to run after sampling */
+
+ /* WM97XX_PRP value to configure while system is suspended */
+ u16 suspend_mode;
};
struct wm97xx {
--
1.5.5
--
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