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authorRobert Jarzmik <robert.jarzmik@free.fr>2009-01-24 23:56:42 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:20:26 -0700
commitb799a7eb68082af620b7e37b6f41c98802e831f6 (patch)
tree3e03ef6d83eac47675ccb673432a862de29578f2 /drivers/usb/gadget/pxa27x_udc.c
parenteb50702539f9be3765127d927d3e9ccfeb65f26e (diff)
USB: pxa27x_udc: add vbus session handling
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@free.fr> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/pxa27x_udc.c')
-rw-r--r--drivers/usb/gadget/pxa27x_udc.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index f8145590944..0c9307118b5 100644
--- 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 *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_udc *udc)
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_udc *udc)
* 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_udc *udc)
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_gadget *_gadget, int is_active)
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 platform_device *pdev)
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);