usb: otg: Add support for power supply API for USB charging
With this commit, USB Driver will start using Power Supply
API rather than calling direct pmxxx driver API for USB charging.
This will allow hiding specific charger model (such as
external LTC4088 charger used for MDM9x15) from USB driver.
In case the power supply API is not support, fallback to legacy
API which uses pm8921 driver.
Change-Id: Ic0f302e3aa8aa60f6483a0fdeec9389a0ded1fac
Signed-off-by: Amit Blay <ablay@codeaurora.org>
diff --git a/drivers/usb/otg/msm_otg.c b/drivers/usb/otg/msm_otg.c
index 56559bf..1066f38 100644
--- a/drivers/usb/otg/msm_otg.c
+++ b/drivers/usb/otg/msm_otg.c
@@ -38,6 +38,7 @@
#include <linux/regulator/consumer.h>
#include <linux/mfd/pm8xxx/pm8921-charger.h>
#include <linux/pm_qos_params.h>
+#include <linux/power_supply.h>
#include <mach/clk.h>
#include <mach/msm_xo.h>
@@ -838,6 +839,35 @@
}
#endif
+static int msm_otg_notify_power_supply(struct msm_otg *motg, unsigned mA)
+{
+ struct power_supply *psy;
+
+ psy = power_supply_get_by_name("usb");
+ if (!psy)
+ goto psy_not_supported;
+
+ if (motg->cur_power == 0 && mA > 0) {
+ /* Enable charging */
+ if (power_supply_set_online(psy, true))
+ goto psy_not_supported;
+ } else if (motg->cur_power > 0 && mA == 0) {
+ /* Disable charging */
+ if (power_supply_set_online(psy, false))
+ goto psy_not_supported;
+ return 0;
+ }
+ /* Set max current limit */
+ if (power_supply_set_current_limit(psy, 1000*mA))
+ goto psy_not_supported;
+
+ return 0;
+
+psy_not_supported:
+ dev_dbg(motg->otg.dev, "Power Supply doesn't support USB charger\n");
+ return -ENXIO;
+}
+
static void msm_otg_notify_charger(struct msm_otg *motg, unsigned mA)
{
if ((motg->chg_type == USB_ACA_DOCK_CHARGER ||
@@ -851,7 +881,14 @@
return;
dev_info(motg->otg.dev, "Avail curr from USB = %u\n", mA);
- pm8921_charger_vbus_draw(mA);
+
+ /*
+ * Use Power Supply API if supported, otherwise fallback
+ * to legacy pm8921 API.
+ */
+ if (msm_otg_notify_power_supply(motg, mA))
+ pm8921_charger_vbus_draw(mA);
+
motg->cur_power = mA;
}