usb/penwell_otg: notify charger driver to drive VBUS in CLV

BZ: 28638

USB driver will notify charger driver to provide 5v on VBUS line
of USB OTG port in CLV, this is needed for USB Host function.

Change-Id: I151c254e95c89c9a615655911a8de6e7283ba18b
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/40194
Reviewed-by: Pallala, Ramakrishna <ramakrishna.pallala@intel.com>
Reviewed-by: Zhuang, Jin Can <jin.can.zhuang@intel.com>
Reviewed-by: Pandey, Raj <raj.pandey@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Reviewed-by: Meng, Zhe <zhe.meng@intel.com>
Tested-by: Meng, Zhe <zhe.meng@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>

diff --git a/drivers/usb/otg/penwell_otg.c b/drivers/usb/otg/penwell_otg.c
index 8a7e5af..04bd574 100644 (file)
--- a/drivers/usb/otg/penwell_otg.c
+++ b/drivers/usb/otg/penwell_otg.c
@@ -137,6 +137,8 @@ static const char *psc_string(enum power_supply_type charger)
                return "Dedicated Charging Port";
        case POWER_SUPPLY_TYPE_USB_ACA:
                return "Accessory Charger Adaptor";
+       case POWER_SUPPLY_TYPE_USB_HOST:
+               return "USB Host";
        case POWER_SUPPLY_TYPE_BATTERY:
                return "Unknown";
        default:
@@ -596,9 +598,11 @@ static void penwell_otg_phy_enable(int on)
 /* A-device drives vbus, controlled through MSIC register */
 static int penwell_otg_set_vbus(struct otg_transceiver *otg, bool enabled)
 {
-       struct penwell_otg      *pnw = the_transceiver;
-       u8                      data;
-       int                     retval;
+       struct penwell_otg              *pnw = the_transceiver;
+       u8                              data;
+       unsigned long                   flags;
+       int                             retval;
+       struct power_supply_charger_cap psc_cap;
 
        dev_dbg(pnw->dev, "%s ---> %s\n", __func__, enabled ? "on" : "off");
 
@@ -615,6 +619,33 @@ static int penwell_otg_set_vbus(struct otg_transceiver *otg, bool enabled)
                        penwell_otg_ulpi_write(&pnw->iotg,
                                ULPI_OTGCTRLCLR, DRVVBUS | DRVVBUS_EXTERNAL);
                retval = 0;
+
+               if (enabled) {
+                       spin_lock_irqsave(&pnw->charger_lock, flags);
+                       pnw->psc_cap.mA = 500;
+                       pnw->psc_cap.chrg_type =
+                               POWER_SUPPLY_TYPE_USB_HOST;
+                       pnw->psc_cap.chrg_evt =
+                               POWER_SUPPLY_CHARGER_EVENT_CONNECT;
+                       psc_cap =  pnw->psc_cap;
+                       spin_unlock_irqrestore(&pnw->charger_lock, flags);
+               } else {
+                       spin_lock_irqsave(&pnw->charger_lock, flags);
+                       pnw->psc_cap.mA = 0;
+                       pnw->psc_cap.chrg_type =
+                               POWER_SUPPLY_TYPE_BATTERY;
+                       pnw->psc_cap.chrg_evt =
+                               POWER_SUPPLY_CHARGER_EVENT_DISCONNECT;
+                       psc_cap =  pnw->psc_cap;
+                       spin_unlock_irqrestore(&pnw->charger_lock, flags);
+               }
+
+               dev_dbg(pnw->dev, "notify power_supply_charger_event\n");
+               dev_dbg(pnw->dev, "mA = %d\n", psc_cap.mA);
+               dev_dbg(pnw->dev, "event = %d\n", psc_cap.chrg_evt);
+               dev_dbg(pnw->dev, "type = %s\n", psc_string(psc_cap.chrg_type));
+
+               power_supply_charger_event(psc_cap);
                goto done;
        }