From: Robert Jarzmik <robert.jarzmik@xxxxxxx>
On vbus_session() call, optionally activate D+ pullup
resistor and enable the udc, or deactivate D+ pullup
resistor and disable the udc.
It is intentional to not handle any VBus sense related irq.
An external transceiver driver (like gpio_vbus) should
catch VBus sense signal, and call usb_gadget_vbus_connect()
or usb_gadget_vbus_disconnect().
Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/pxa27x_udc.c | 33 +++++++++++++++++++++++++++++++++
drivers/usb/gadget/pxa27x_udc.h | 1 +
2 files changed, 34 insertions(+)
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -1536,8 +1536,10 @@ static void udc_disable(struct pxa_udc *
* Context: any
*
* The UDC should be enabled if :
+
* - the pullup resistor is connected
* - and a gadget driver is bound
+ * - and vbus is sensed (or no vbus sense is available)
*
* Returns 1 if UDC should be enabled, 0 otherwise
*/
@@ -1546,6 +1548,7 @@ static int should_enable_udc(struct pxa_
int put_on;
put_on = ((udc->pullup_on) && (udc->driver));
+ put_on &= ((udc->vbus_sensed) || (!udc->transceiver));
return put_on;
}
@@ -1557,6 +1560,7 @@ static int should_enable_udc(struct pxa_
* The UDC should be disabled if :
* - the pullup resistor is not connected
* - or no gadget driver is bound
+ * - or no vbus is sensed (when vbus sesing is available)
*
* Returns 1 if UDC should be disabled
*/
@@ -1565,6 +1569,7 @@ static int should_disable_udc(struct pxa
int put_off;
put_off = ((!udc->pullup_on) || (!udc->driver));
+ put_off |= ((!udc->vbus_sensed) && (udc->transceiver));
return put_off;
}
@@ -1592,10 +1597,37 @@ static int pxa_udc_pullup(struct usb_gad
return 0;
}
+static void udc_enable(struct pxa_udc *udc);
+static void udc_disable(struct pxa_udc *udc);
+
+/**
+ * pxa_udc_vbus_session - Called by external transceiver to enable/disable udc
+ * @_gadget: usb gadget
+ * @is_active: 0 if should disable the udc, 1 if should enable
+ *
+ * Enables the udc, and optionnaly activates D+ pullup resistor. Or disables the
+ * udc, and deactivates D+ pullup resistor.
+ *
+ * Returns 0
+ */
+static int pxa_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
+{
+ struct pxa_udc *udc = to_gadget_udc(_gadget);
+
+ udc->vbus_sensed = is_active;
+ if (should_enable_udc(udc))
+ udc_enable(udc);
+ if (should_disable_udc(udc))
+ udc_disable(udc);
+
+ return 0;
+}
+
static const struct usb_gadget_ops pxa_udc_ops = {
.get_frame = pxa_udc_get_frame,
.wakeup = pxa_udc_wakeup,
.pullup = pxa_udc_pullup,
+ .vbus_session = pxa_udc_vbus_session,
/* current versions must always be self-powered */
};
@@ -2357,6 +2389,7 @@ static int __init pxa_udc_probe(struct p
device_initialize(&udc->gadget.dev);
udc->gadget.dev.parent = &pdev->dev;
udc->gadget.dev.dma_mask = NULL;
+ udc->vbus_sensed = 0;
the_controller = udc;
platform_set_drvdata(pdev, udc);
--- a/drivers/usb/gadget/pxa27x_udc.h
+++ b/drivers/usb/gadget/pxa27x_udc.h
@@ -456,6 +456,7 @@ struct pxa_udc {
unsigned enabled:1;
unsigned pullup_on:1;
unsigned pullup_resume:1;
+ unsigned vbus_sensed:1;
unsigned config:2;
unsigned last_interface:3;
unsigned last_alternate:3;
--
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