abx500-chargalg: Add new sysfs interface to get current charge status

Allow a user to check on AB8500 charging status from debugfs.

Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
index 0483e7cb2268..d834566410bc 100644
--- a/drivers/power/ab8500_charger.c
+++ b/drivers/power/ab8500_charger.c
@@ -2764,6 +2764,9 @@ static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
         enum ab8500_usb_state bm_usb_state;
         unsigned mA = *((unsigned *)power);
 
+        if (!di)
+                return NOTIFY_DONE;
+
         if (event != USB_EVENT_VBUS) {
                 dev_dbg(di->dev, "not a standard host, returning\n");
                 return NOTIFY_DONE;