The twl4030-usb driver exports the status of VBUS as sysfs attribute.
In case an accessory charger adapter (ACA) is connected to the OTG
transceiver the attribute is always 'off', even when the charger
provides VBUS. Added a variable to keep track of the status of VBUS
and report it correctly
Signed-off-by: Matthias Kaehlcke <matthias.kaehl...@tomtom.com>
---
drivers/usb/otg/twl4030-usb.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index e01b073..efeb4d1 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -160,6 +160,7 @@ struct twl4030_usb {
int irq;
u8 linkstat;
+ bool vbus_supplied;
u8 asleep;
bool irq_enabled;
};
@@ -250,6 +251,8 @@ static enum usb_xceiv_events
twl4030_usb_linkstat(struct twl4030_usb *twl)
int status;
int linkstat = USB_EVENT_NONE;
+ twl->vbus_supplied = false;
+
/*
* For ID/VBUS sensing, see manual section 15.4.8 ...
* except when using only battery backup power, two
@@ -265,6 +268,9 @@ static enum usb_xceiv_events
twl4030_usb_linkstat(struct twl4030_usb *twl)
if (status < 0)
dev_err(twl->dev, "USB link status err %d\n", status);
else if (status & (BIT(7) | BIT(2))) {
+ if (status & (BIT(7)))
+ twl->vbus_supplied = true;
+
if (status & BIT(2))
linkstat = USB_EVENT_ID;
else
@@ -484,7 +490,7 @@ static ssize_t twl4030_usb_vbus_show(struct device *dev,
spin_lock_irqsave(&twl->lock, flags);
ret = sprintf(buf, "%s\n",
- (twl->linkstat == USB_EVENT_VBUS) ? "on" : "off");
+ twl->vbus_supplied ? "on" : "off");
spin_unlock_irqrestore(&twl->lock, flags);
return ret;
@@ -608,6 +614,7 @@ static int __devinit twl4030_usb_probe(struct
platform_device *pdev)
twl->otg.set_peripheral = twl4030_set_peripheral;
twl->otg.set_suspend = twl4030_set_suspend;
twl->usb_mode = pdata->usb_mode;
+ twl->vbus_supplied = false;
twl->asleep = 1;
/* init spinlock for workqueue */
--
1.7.1
--
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