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>

2 files changed, 24 insertions, 1 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;
diff --git a/drivers/power/abx500_chargalg.c b/drivers/power/abx500_chargalg.c
index 7defb3e91d59..f043c0851a76 100644
--- a/drivers/power/abx500_chargalg.c
+++ b/drivers/power/abx500_chargalg.c
@@ -1654,6 +1654,25 @@ static int abx500_chargalg_get_property(struct power_supply *psy,
 /* Exposure to the sysfs interface */
 
 /**
+ * abx500_chargalg_sysfs_show() - sysfs show operations
+ * @kobj:      pointer to the struct kobject
+ * @attr:      pointer to the struct attribute
+ * @buf:       buffer that holds the parameter to send to userspace
+ *
+ * Returns a buffer to be displayed in user space
+ */
+static ssize_t abx500_chargalg_sysfs_show(struct kobject *kobj,
+                                          struct attribute *attr, char *buf)
+{
+        struct abx500_chargalg *di = container_of(kobj,
+               struct abx500_chargalg, chargalg_kobject);
+
+        return sprintf(buf, "%d\n",
+                       di->susp_status.ac_suspended &&
+                       di->susp_status.usb_suspended);
+}
+
+/**
  * abx500_chargalg_sysfs_charger() - sysfs store operations
  * @kobj:      pointer to the struct kobject
  * @attr:      pointer to the struct attribute
@@ -1721,7 +1740,7 @@ static ssize_t abx500_chargalg_sysfs_charger(struct kobject *kobj,
 static struct attribute abx500_chargalg_en_charger = \
 {
         .name = "chargalg",
-        .mode = S_IWUSR,
+        .mode = S_IRUGO | S_IWUSR,
 };
 
 static struct attribute *abx500_chargalg_chg[] = {
@@ -1730,6 +1749,7 @@ static struct attribute *abx500_chargalg_chg[] = {
 };
 
 static const struct sysfs_ops abx500_chargalg_sysfs_ops = {
+        .show = abx500_chargalg_sysfs_show,
         .store = abx500_chargalg_sysfs_charger,
 };