extcon: max77843: Add OTG power control to the MUIC driver

Enabling power on VBUS micro-usb pin is required only when passive OTG
cable is connected. Initially OTG VBUS power control was planned to be
done in charger driver. However such information is not really available
from the extcon notifications, so VBUS power control has to be done
directly in MUIC driver, which has all information about the attached
accessory.

For example SmartDock is externally powered accessory, provides OTG
(USB HOST) functionality and use VBUS pin for charging a device battery,
so the VBUS charging pump should be disabled in such case.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-max77843.c b/drivers/extcon/extcon-max77843.c
index 28f251ff0fa2..17d6bd76edb4 100644
--- a/drivers/extcon/extcon-max77843.c
+++ b/drivers/extcon/extcon-max77843.c
@@ -240,6 +240,21 @@ static int max77843_muic_set_path(struct max77843_muic_info *info,
         return 0;
 }
 
+static void max77843_charger_set_otg_vbus(struct max77843_muic_info *info,
+                 bool on)
+{
+        struct max77693_dev *max77843 = info->max77843;
+        unsigned int cnfg00;
+
+        if (on)
+                cnfg00 = MAX77843_CHG_OTG_MASK | MAX77843_CHG_BOOST_MASK;
+        else
+                cnfg00 = MAX77843_CHG_ENABLE | MAX77843_CHG_BUCK_MASK;
+
+        regmap_update_bits(max77843->regmap_chg, MAX77843_CHG_REG_CHG_CNFG_00,
+                           MAX77843_CHG_MODE_MASK, cnfg00);
+}
+
 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
                 enum max77843_muic_cable_group group, bool *attached)
 {
@@ -355,6 +370,7 @@ static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
                         return ret;
 
                 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
+                max77843_charger_set_otg_vbus(info, attached);
                 break;
         case MAX77843_MUIC_GND_MHL_VB:
         case MAX77843_MUIC_GND_MHL: