max8925_power: Check at probe time if power to set online

The interrupt for ac on/off can be missed during boot time.
Check if online by seeing if we have power.  We choose 0.5V
since this is high enough to avoid random reading from a
input that could be floating if no charger.

Signed-off-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Ted Bennett <tbennett@marvell.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
index d87032afcb5a..815525094ff9 100644
--- a/drivers/power/max8925_power.c
+++ b/drivers/power/max8925_power.c
@@ -377,9 +377,15 @@ static __devinit int max8925_init_charger(struct max8925_chip *chip,
         REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
         REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 
-        info->ac_online = 0;
         info->usb_online = 0;
         info->bat_online = 0;
+
+        /* check for power - can miss interrupt at boot time */
+        if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
+                info->ac_online = 1;
+        else
+                info->ac_online = 0;
+
         ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
         if (ret >= 0) {
                 /*